Pietenpol-List Digest Archive

Wed 07/30/14


Total Messages Posted: 37



Today's Message Index:
----------------------
 
     1. 07:01 AM - 57 second of fun-----Pietenpol Smoke System (Cuy, Michael D. (GRC-LME0)[Vantage Partners, LLC])
     2. 07:18 AM - Douwe's JATO mod (Douwe Blumberg)
     3. 07:32 AM - Re: Douwe's JATO mod (glenschweizer@yahoo.com)
     4. 07:43 AM - Re: Douwe's JATO mod (curtdm(at)gmail.com)
     5. 08:13 AM - which holds more oil? (Cuy, Michael D. (GRC-LME0)[Vantage Partners, LLC])
     6. 08:30 AM - Re: Douwe's JATO mod (Ryan Mueller)
     7. 09:09 AM - Re: off subject----98 Year old Dick Cole Flies B-25 into Oshkosh........ (Jim Boyer)
     8. 09:27 AM - NX992WD Initial W.& B. (Michael Perez)
     9. 09:41 AM - Re: NX992WD Initial W.& B. (Ryan Mueller)
    10. 09:54 AM - Re: NX992WD Initial W.& B. (taildrags)
    11. 10:01 AM - Re: NX992WD Initial W.& B. (Michael Perez)
    12. 10:04 AM - spar strength (taildrags)
    13. 10:18 AM - Re: spar strength (Michael Perez)
    14. 10:25 AM - Re: NX992WD Initial W.& B. (Ryan Mueller)
    15. 10:36 AM - Re: NX992WD Initial W.& B. (Cuy, Michael D. (GRC-LME0)[Vantage Partners, LLC])
    16. 10:37 AM - Re: NX992WD Initial W.& B. (Michael Perez)
    17. 10:48 AM - pilot position and W&B (Cuy, Michael D. (GRC-LME0)[Vantage Partners, LLC])
    18. 10:50 AM - Re: NX992WD Initial W.& B. (Michael Perez)
    19. 11:02 AM - Re: spar strength (larharris2 Harris)
    20. 11:20 AM - Re: NX992WD Initial W.& B. (Cuy, Michael D. (GRC-LME0)[Vantage Partners, LLC])
    21. 11:55 AM - Re: NX992WD Initial W.& B. (Scott Knowlton)
    22. 12:31 PM - Re: which holds more oil? (Gary Boothe)
    23. 12:58 PM - Re: Eyesight (Boatright, Jeffrey)
    24. 02:00 PM - Re: Eyesight (AircamperN11MS)
    25. 03:32 PM - Re: NX992WD Initial W.& B. (Michael Perez)
    26. 04:12 PM - Re: Re: NX992WD Initial W.& B. (Gene Rambo)
    27. 04:34 PM - Re: spar strength (gsnewsome)
    28. 05:15 PM - Re: spar strength (pjb)
    29. 05:16 PM - Re: spar strength (Doug)
    30. 05:17 PM - Re: Eyesight (Doug)
    31. 05:26 PM - Re: Eyesight (Boatright, Jeffrey)
    32. 06:10 PM - Re: Re: spar strength (Ken Bickers)
    33. 07:03 PM - Re: Andrew King (Baldeagle)
    34. 07:04 PM - Re: spar strength (Gene Rambo)
    35. 07:30 PM - Re: spar strength (Jack Phillips)
    36. 07:35 PM - Re: spar strength (aerocarjake)
    37. 09:37 PM - Re: spar strength (taildrags)
 
 
 


Message 1


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    Time: 07:01:39 AM PST US
    From: "Cuy, Michael D. (GRC-LME0)[Vantage Partners, LLC]" <michael.d.cuy@nasa.gov>
    Subject: 57 second of fun-----Pietenpol Smoke System
    Piet Group (or as I like to call us all.....Infidels!) I'd like to take a minute to apologize to the list for losing my cool recen tly in a few of my responses that should have been handled off-list. My s incere apologies as this list has traditionally been an incredibly friendly place to exchang e, help, and promote the building, flying, and enjoyment of these incredibl y wonderful little Pietenpol Air Camper airplanes. I am committed to contributing to this li st and being as helpful as I can in a positive and uplifting fashion to all who are building, interested in building, or already flying and enjoying all the hard work a nd fruits of your labor. We don't have room for profanity or divisivenes s. We've got enough of that coming thru our tv sets and movies and on the news in America. I've made some lifelong and treasured friendships on this list that far exc eed the importance and value of my airplane and have come to believe the wise words of EAA fou nder Paul Poberezny---- it's not as much about the airplanes as it is the p eople. And now the movie, folks. Last night I installed a new smoke system bott le (they tend to loose pressure when you pump them up after exposed to the mineral oil after a season) and though I would share what the smoke looks like from the cock pit. Great fun. I hope you all enjoy. Mike C. Ohio https://www.youtube.com/watch?v=KnMpUIwhY70&list=UUJBVQTlDP0gbWbUGYSaUt bg


    Message 2


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    Time: 07:18:18 AM PST US
    From: "Douwe Blumberg" <douweblumberg@earthlink.net>
    Subject: Douwe's JATO mod
    The new downturned exhaust was specifically engineered to increase climb at full throttle. It also might keep exhaust crap off my fuselage. Douwe


    Message 3


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    Time: 07:32:56 AM PST US
    Subject: Re: Douwe's JATO mod
    From: glenschweizer@yahoo.com
    And besides, it looks cool. Maby some. Fuzzy dice for the front pit? Or one of those hula girl things? Sent from my iPhone > On Jul 30, 2014, at 7:17 AM, "Douwe Blumberg" <douweblumberg@earthlink.net > wrote: > > The new downturned exhaust was specifically engineered to increase climb a t full throttle > > > > It also might keep exhaust crap off my fuselage > > Douwe > > 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D >


    Message 4


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    Time: 07:43:12 AM PST US
    Subject: Re: Douwe's JATO mod
    From: "curtdm(at)gmail.com" <curtdm@gmail.com>
    Also prevents elevator droop. -------- Curt Merdan Flower Mound, TX Read this topic online here: http://forums.matronics.com/viewtopic.php?p=427544#427544


    Message 5


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    Time: 08:13:26 AM PST US
    From: "Cuy, Michael D. (GRC-LME0)[Vantage Partners, LLC]" <michael.d.cuy@nasa.gov>
    Subject: which holds more oil?
    Here are the handy little Lowe's or Home Depot garden department poly spray bottles that I use to pressurize my smoke oil (basically mineral oil) to inject into the right rear exhaust pipe of my A-65 engine. Every year I need to replace the bottle because the old bottles begin to leak as soon as you pu mp them up from exposure to the oil after a while. Last night I installed the new poly bottle and was bummed because it held l ess fluid......or so I thought. Which one do you think holds more fluid? I was surprised to read that th e container on the right holds 56 oz. and the old bottle on the left holds 51 oz. I still don't believe it and am going to do a little test next time I empty out the new smoke oil bottle! (which won't take long if this gorgeous w eather keeps up.) Mike C. [cid:image001.jpg@01CFABE7.388466F0]


    Message 6


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    Time: 08:30:38 AM PST US
    Subject: Re: Douwe's JATO mod
    From: Ryan Mueller <ryan@rmueller.org>
    After having flown in your Piet Dan Y opined that it was, and I quote, a "smooooooooth" ride. Possibly an unintended consequence of your exhaust mod.....or maybe the wake turbulence off the pig's wings cancels out the prop wash.... Either way, it was great to see you guys and RE-PIET at Brodhead, -Ryan On Wed, Jul 30, 2014 at 9:17 AM, Douwe Blumberg <douweblumberg@earthlink.ne t > wrote: > The new downturned exhaust was specifically engineered to increase climb > at full throttle > > > It also might keep exhaust crap off my fuselage > > > Douwe > > * > =========== .matronics.com/Navigator?Pietenpol-List> =========== =========== om/contribution> =========== > > * > >


    Message 7


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    Time: 09:09:05 AM PST US
    From: Jim Boyer <boyerjrb@comcast.net>
    Subject: Re: off subject----98 Year old Dick Cole Flies B-25 into
    Oshkosh........ HI Mike, Thanks for sharing the video of Dick Cole and the B-25. Jim B.


    Message 8


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    Time: 09:27:06 AM PST US
    From: Michael Perez <speedbrake@sbcglobal.net>
    Subject: NX992WD Initial W.& B.
    Crew, I got my hands on a set of race car scales and set up my plane for th e initial W.& B. I am mainly trying to figure out where the wing needs to b e placed for a good C.G.- Since the jury struts are not in place, nor the diagonals, I laid the material for those across the cockpits to include th e weight. I believe I included everything else for an accurate weight and b alance.=0A=0A=0APlane level in both "X" and "Y" planes.-=0A=0ANo fuel and full oil. (A-65)=0A=0AEmpty Weight = 577#- 8# difference between main gear wheels. =0A=0A=0ATail wheel weight = 3#.=0A=0AEmpty Weight C.G. = 12" aft of wing leading edge.- Wing cabane struts are 87 deg. to longeron s.=0A=0AFrom the numbers I am figuring, a wing shift aft of about 2"-3" is in order.=0A=0AChecking and rechecking the measurements and math now. Once confirmed, I'll start making the diagonals and jurys.=0A=0A=0AIf God is you r co-pilot, switch seats=0AMike Perez=0AKaretakerAero=0AWorking W.& B. Numb ers=0A


    Message 9


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    Time: 09:41:40 AM PST US
    Subject: Re: NX992WD Initial W.& B.
    From: Ryan Mueller <ryan@rmueller.org>
    Hi Michael, If you still have the scales it would be useful to have someone sit in pilot's seat of the aircraft and weigh it as well. Using the maths and your empty weight numbers you could then determine the exact arm their weight sits at, as opposed to the guesstimate based on belly-button, mid-seat, or what-have-you. This will allow you to arrive at very accurate CG results for different pilot weights with at a given wing location... A ladder and some helpers would be prudent, just to make sure everything stays nice and stable during the process. On Wed, Jul 30, 2014 at 11:26 AM, Michael Perez <speedbrake@sbcglobal.net> wrote: > Crew, I got my hands on a set of race car scales and set up my plane for > the initial W.& B. I am mainly trying to figure out where the wing needs to > be placed for a good C.G. Since the jury struts are not in place, nor the > diagonals, I laid the material for those across the cockpits to include > the weight. I believe I included everything else for an accurate weight and > balance. > > Plane level in both "X" and "Y" planes. > > No fuel and full oil. (A-65) > > Empty Weight = 577# 8# difference between main gear wheels. > > Tail wheel weight = 3#. > > Empty Weight C.G. = 12" aft of wing leading edge. Wing cabane struts are > 87 deg. to longerons. > > From the numbers I am figuring, a wing shift aft of about 2"-3" is in > order. > > Checking and rechecking the measurements and math now. Once confirmed, > I'll start making the diagonals and jurys. > > If God is your co-pilot, switch seats > Mike Perez > Karetaker Aero > Working W.& B. Numbers > > * > > > * > >


    Message 10


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    Time: 09:54:10 AM PST US
    Subject: Re: NX992WD Initial W.& B.
    From: "taildrags" <taildrags@hotmail.com>
    Ryan; That is exactly what I did to determine the moment arm of the pilot and passenger, and it came out a bit different from the "belly-button" method. Very easy to do, as long as whoever is doing the weighing remembers to weigh themselves on the same scales either before or after weighing the airplane. -------- Oscar Zuniga Medford, OR Air Camper NX41CC &quot;Scout&quot; A75 power Read this topic online here: http://forums.matronics.com/viewtopic.php?p=427557#427557


    Message 11


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    Time: 10:01:00 AM PST US
    From: Michael Perez <speedbrake@sbcglobal.net>
    Subject: Re: NX992WD Initial W.& B.
    The scales are being returned today. However, I may be able to get them bac k at a later time...definitely after racing season ends. (But by then the p lane will be disassembled and in pieces staged throughout the garage/house. ..)- If I had the scales for another day or two, I would do exactly what you recommend. That was the original plan, just ran out of time.=0A=0A- =0AIf God is your co-pilot, switch seats=0AMike Perez=0AKaretaker Aero=0AWo rking W.& B. Numbers


    Message 12


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    Time: 10:04:53 AM PST US
    Subject: spar strength
    From: "taildrags" <taildrags@hotmail.com>
    Jim Hyde, this discussion is not intended for you, but you're welcome to read on. Since my previous post on this subject had no calculations behind it, I've decided to run some numbers for my own information. Anyone else who is interested, I'll use this thread to keep the discussion separate from Mike Cuy's W&B and out of the hands of those who don't care. If you are of the opinion that "it works, leave it alone" and "I'm just going to bump my own airplane's max gross to 1300 because other guys have", then please use your key when you see posts with the subject line "spar strength". So is anyone using a 1" thick spar anymore? My sense is that everyone uses either a solid 3/4" spar or a routed 3/4" spar these days. The few who build box spars (the UK style) are in an entirely different category, because that spar was developed with both calculations *and* load testing behind it. My interest is in running the calculations for those who build to the plans. -------- Oscar Zuniga Medford, OR Air Camper NX41CC &quot;Scout&quot; A75 power Read this topic online here: http://forums.matronics.com/viewtopic.php?p=427558#427558


    Message 13


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    Time: 10:18:03 AM PST US
    From: Michael Perez <speedbrake@sbcglobal.net>
    Subject: Re: spar strength
    Oscar, I am more than interested in what you and others take the time to re search, test, calculate, experiment, etc. and share!- I understand that i t takes time for guys to do the work, the research, the calculations, etc. all to benefit those whom come after us. I will be following this Spar Stre ngth thread.=0A=0A-=0AIf God is your co-pilot, switch seats=0AMike Perez =0AKaretaker Aero=0AWorking W.& B. Numbers


    Message 14


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    Time: 10:25:11 AM PST US
    Subject: Re: NX992WD Initial W.& B.
    From: Ryan Mueller <ryan@rmueller.org>
    If I recall, I believe I have the measurements from firewall to seat back for the aircraft we did the W&B project for at Brodhead. I'll take a look later (tonight) and see what the difference was between the seat backs and where we calculated the arm for the pilot to be for the various aircraft... On Wed, Jul 30, 2014 at 12:00 PM, Michael Perez <speedbrake@sbcglobal.net> wrote: > The scales are being returned today. However, I may be able to get them > back at a later time...definitely after racing season ends. (But by then > the plane will be disassembled and in pieces staged throughout the > garage/house...) If I had the scales for another day or two, I would do > exactly what you recommend. That was the original plan, just ran out of > time. > > If God is your co-pilot, switch seats > Mike Perez > Karetaker Aero > Working W.& B. Numbers > > * > > > * > >


    Message 15


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    Time: 10:36:29 AM PST US
    From: "Cuy, Michael D. (GRC-LME0)[Vantage Partners, LLC]" <michael.d.cuy@nasa.gov>
    Subject: NX992WD Initial W.& B.
    TWlrZSBQLiAgIENvbmdyYXR1bGF0aW9ucyBvbiBzdWNoIGEgTE9XIGVtcHR5IHdlaWdodCEgICAg V2VsbCBkb25lIGFuZCBhbHNvIGdvb2QgdG8gaGVhciB5b3XigJl2ZSBjb21wbGV0ZWQgeW91ciBX JkIuICAgICBZb3XigJlyZSBnZXR0aW5nIGNsb3NlciBhbGwgdGhlIHRpbWUgdG8gdGhlIHNlY29u ZCBoYWxmIG9mIGEgZ3JlYXQgYWR2ZW50dXJlDQp3aXRoIHlvdXIgUGlldGVucG9sLg0KDQpNaWtl IEMuDQpPaGlvDQoNCg0KDQo


    Message 16


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    Time: 10:37:26 AM PST US
    From: Michael Perez <speedbrake@sbcglobal.net>
    Subject: Re: NX992WD Initial W.& B.
    I would appreciate that Ryan, any added intel. would be of help. I have been fooling with the math using different pilot locations...10", 11", 12" etc. from the pilot seat back, top; as well as wing sweep, fuel, pilot weight..all the variables. It is good practice and helps visualize how the changes work and interact with each other. If God is your co-pilot, switch seats Mike Perez Karetaker Aero Working W.& B. Numbers


    Message 17


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    Time: 10:48:13 AM PST US
    From: "Cuy, Michael D. (GRC-LME0)[Vantage Partners, LLC]" <michael.d.cuy@nasa.gov>
    Subject: pilot position and W&B
    On a smooth evening you can trim out a Pietenpol to fly hands-off and then by just leaning far forward and far backward you can make the plane gently climb and descend. Of course us full-figured girls have more mass to work with when conducting this fun little experiment. Your belly button location may vary. Mike C.


    Message 18


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    Time: 10:50:28 AM PST US
    From: Michael Perez <speedbrake@sbcglobal.net>
    Subject: Re: NX992WD Initial W.& B.
    Thanks Mike. Your help has been instrumental with the building process, eng ines acquisition, calculations etc. Sharing you experiences have been more than helpful...and entertaining at times...=0A=0A-=0AIf God is your co-pi lot, switch seats=0AMike Perez=0AKaretaker Aero=0AWorking W.& B. Numbers


    Message 19


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    Time: 11:02:54 AM PST US
    From: larharris2 Harris <larharris2@msn.com>
    Subject: spar strength
    I'm in. I would very much like to justify an increase over the original 10 80 lb gross weight. I did a few rough calculations of the weight bearing capability of a 1" sol id spar. At first I just plugged a few numbers into a formula & got a prepo sterous answer. Then I studied the problem a bit more and got a more reason able=2C although discouraging=2C answer. Assumption: Spanwise loading is uniform (not true=2C but the calculated err or is small). My INVALID assumption was that the 2 spars (without struts) are carrying the entire flight load. >From Understanding Wood by Bruce Hoadly=2C MR[Modulus of Rupture] = 1.5 ( Pmax (L))/ b(d^2) 12% dry Sitka Spruce MR= 10=2C200 psi b= 1" (spar thickness) d= 4.75" (spar depth) L= 13.5 ft (total distance to the center of each wing panel=2C without th e 'center' supported by the cabanes) The arithmetic says that each unsupported spar can carry 952 Lb at failure. Double that to 1894 lb because of the 2 spars. The struts=2C therefore=2C are essential for flight. A structural analysis of spars + struts is not a trivial exercise. I have the reference texts to help me dig through it=2C but it will take some more time. More to follow. Lorenzo


    Message 20


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    Time: 11:20:27 AM PST US
    From: "Cuy, Michael D. (GRC-LME0)[Vantage Partners, LLC]" <michael.d.cuy@nasa.gov>
    Subject: NX992WD Initial W.& B.
    Glad to share what info I can Mike and like the rest of us who have flying Piets, there were always, always those who went before us and helped us out with questions, answers, options, and good advice to help us along. Most of my help came in the ea rly days just before this list came to be and was gathered at the Brodhead fly-in's. I attended my first Brodhead in 1988......26 years ago and after talking with a bunch of guys t here, taking a zillion measurements, notes, and photos and exchanging lett ers and phone calls with other builders I had a flying Piet 10 years later in 1998. 16 years after my first flight I still get great joy out of seeing every new Piet roll out of the garages, barns, workshops, and hangars and take flight. Cool stuff. From: owner-pietenpol-list-server@matronics.com [mailto:owner-pietenpol-lis t-server@matronics.com] On Behalf Of Michael Perez Sent: Wednesday, July 30, 2014 1:50 PM Subject: Re: Pietenpol-List: NX992WD Initial W.& B. Thanks Mike. Your help has been instrumental with the building process, eng ines acquisition, calculations etc. Sharing you experiences have been more than helpful...and entertaining at times... If God is your co-pilot, switch seats Mike Perez Karetaker Aero Working W.& B. Numbers


    Message 21


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    Time: 11:55:48 AM PST US
    Subject: Re: NX992WD Initial W.& B.
    From: Scott Knowlton <flyingscott_k@hotmail.com>
    DQpJIGVjaG8gTWlrZSBDdXkncyBwcmFpc2UuICBVbmRlciA2MDBsYnMuICBZb3UgbXVzdCBoYXZl IGJlZW4gYSBmYXN0aWRpb3VzIHdlaWdodCBwb2xpY2VtYW4uICBWZXJ5IHdlbGwgZG9uZSBNaWtl ISAgIEl0IHNvdW5kcyBsaWtlIGxhdGV4IGhvdXNlIHBhaW50IGRvZXNuJ3QgYWRkIGFuIGFwcHJl Y2lhYmxlIGFtb3VudCBvZiB3ZWlnaHQgdG8gdGhlIHN0cnVjdHVyZSBlaXRoZXIuICBUaGFua3Mg Zm9yIHNoYXJpbmcgd2l0aCB1cy4gDQoNClNjb3R0IEsuIA0KDQoNClNlbnQgZnJvbSBteSBpUGhv bmUNCg0KPiBPbiBKdWwgMzAsIDIwMTQsIGF0IDE6NDAgUE0sICJDdXksIE1pY2hhZWwgRC4gKEdS Qy1MTUUwKVtWYW50YWdlIFBhcnRuZXJzLCBMTENdIiA8bWljaGFlbC5kLmN1eUBuYXNhLmdvdj4g d3JvdGU6DQo+IA0KPiBNaWtlIFAuICAgQ29uZ3JhdHVsYXRpb25zIG9uIHN1Y2ggYSBMT1cgZW1w dHkgd2VpZ2h0ISAgICBXZWxsIGRvbmUgYW5kIGFsc28gZ29vZCB0byBoZWFyIHlvdcOi4oKs4oSi dmUgY29tcGxldGVkIHlvdXIgVyZCLiAgICAgWW91w6LigqzihKJyZSBnZXR0aW5nIGNsb3NlciBh bGwgdGhlIHRpbWUgdG8gdGhlIHNlY29uZCBoYWxmIG9mIGEgZ3JlYXQgYWR2ZW50dXJlDQo+IHdp dGggeW91ciBQaWV0ZW5wb2wuICAgDQo+ICANCj4gTWlrZSBDLg0KPiBPaGlvDQo+ICANCj4gIA0K PiAgDQo+IMKmwrfigLp+4oCww63CsizDnsOZw4olwqLCvTTDk000fcKnHnLigLnCq+KAsMOqw6d7 ByjCusK4xb7CrThePifCrXp6aOKAncK4wqzCtEnFocWgUWjCrsOp4oCdwrHDq2F4w4bCrcKu4oCw w6Jyw4LDosKyw5FeasObwqt6w4Nawr4oGsK2xaDDrcKhwrrDqMOCw4fCreKApsOpxaHFuCLDosKy w5vCrcWgWMKt4oCww6sswrnDiFrCsMK4wqzCtUnDv0rDpsOscsK4wqnCtionAsK3IcWgw7figJl5 wqrDnOKAnjowxb5aGnfCsMOaw4gaw6jDgsOH4oCa4oCmwqtFAQPDocKiw5os4oCmwqrDnmp3ZsK5 w4hmwrnDiGbCosK3xaHigKDCt8W44oCgw5tpw7/DvDDDgmbCrcKu4oCww6Jyw4co4oC6w7Nawr4o GsK2xaDDj+KAsMOrXsW+xaElList4oCgw5tpw7/DvDDDgmbCrcKu4oCww6Jyw4co4oC6w7Nawr4o GsK2xaDDj+KAsMOrXsW+xaElListw73Co00Two0gJOKAkxARTkVDEknCqcW+4oCawrfFocK1w4on wrXDqcOtalsoasO2wqLigKLCpsOlesO4xaHCthfigJN5wrFowq7DqcKsahrDnn4bbcKnw7/Dn8Ki wrvCpsKyZsKtwq7igLDDonLDhyjFoRttwqfDv8OfwqLCu8KmwrJmwq3CruKAsMOicsOHKOKAusO2 4oC5xaDDi0LContr4oCwwrvCrcWg4oCww5Z5wrTCosK1w6TDoWp5MsKiw6fDqMKvKi7CrgfCp3rC ui7CssOLwqnCpsWgw60xwqttDsK2wqXigKLDosOiwrLDkB3FoSnDmuKAoMK3xbjigKDDm2nDv8O8 MMOCZsKtwq7igLDDonLDhyjigLrDtyjFvsOaw6Juw6tiwqJ4bcK2xbjDv8ODDCZqw5rDqMW+Jyxy 4oCwwr9y4oCww63CribDrsK2KifDvcKvw5vDvcO6J8K3w7pre8O2w6h3L8OhwrZpDQo


    Message 22


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    Time: 12:31:20 PM PST US
    Subject: Re: which holds more oil?
    From: Gary Boothe <gboothe5@comcast.net>
    Most timely! Thanks, Mike. Gary NX308MB Sent from my iPhone > On Jul 30, 2014, at 8:12 AM, "Cuy, Michael D. (GRC-LME0)[Vantage Partners, LLC]" <michael.d.cuy@nasa.gov> wrote: > > Here are the handy little Lowe=99s or Home Depot garden department p oly spray bottles that I use to pressurize my smoke oil (basically mineral o il) to inject > into the right rear exhaust pipe of my A-65 engine. Every year I need t o replace the bottle because the old bottles begin to leak as soon as you pu mp them > up from exposure to the oil after a while. > > Last night I installed the new poly bottle and was bummed because it held l ess fluidor so I thought. > > Which one do you think holds more fluid? I was surprised to read that t he container on the right holds 56 oz. and the old bottle on the left holds 5 1 oz. > I still don=99t believe it and am going to do a little test next tim e I empty out the new smoke oil bottle! (which won=99t take long if this gorgeous weather keeps up.) > > Mike C. > > > > <image001.jpg>


    Message 23


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    Time: 12:58:20 PM PST US
    From: "Boatright, Jeffrey" <jeffboatright@emory.edu>
    Subject: Re: Eyesight
    SGkgU3RldmUsDQoNCknigJltIHNvcnJ5IHRvIGhlYXIgb2YgdGhlIGRpYWdub3NpcywgdGhvdWdo IEnigJltIG5vdCBzdXJlIHdoYXQg4oCccHJlLWdsYXVjb21h4oCdIG1lYW5zLiBJ4oCZbSByZWFs bHkgYSBtb2xlY3VsYXIgYmlvbG9naXN0IG1hc3F1ZXJhZGluZyBhcyBhbiBvcGh0aGFsbW9sb2d5 IHByb2Zlc3Nvci4gIFNvIG5vdGU6IHRoZSBmb2xsb3dpbmcgaXMganVzdCBteSBvcGluaW9uIGFu ZCBjYW5ub3QgYmUgY29uc3RydWVkIGFzIG1lZGljYWwgYWR2aWNlLCB1bmxlc3MgeW914oCZcmUg YSBtb3VzZSBvciByYXQuIEluIHRoYXQgY2FzZSwgcGxlYXNlIGpvaW4gbXkgc3R1ZGllcyDigJQg dGhlIG91dGNvbWUgaXMgZ3VhcmFudGVlZCAxMDAlLiA7KQ0KDQpEaWQgeW91ciBleWUgZG9jIGdp dmUgeW91IGFueSBhZHZpY2UgYWJvdXQgd2hhdCB0byBkbyB0byBhdm9pZCBkZXZlbG9waW5nIGZ1 bGwtb24gZ2xhdWNvbWE/IERvIHlvdSBnbyB0byBhbiBvcGh0aGFsbW9sb2dpc3QgKE1EKSBvciBh biBvcHRvbWV0cmlzdCAoT0QpLCBvciBib3RoPyBFaXRoZXIgY2FuIGJlIGV4Y2VsbGVudC4gUmVn YXJkbGVzcywgeW91IG1pZ2h0IHdhbnQgdG8gYXNrIGhpbSBvciBoZXIgZm9yIGEgcmVmZXJyYWwg dG8gYSBnbGF1Y29tYSBzcGVjaWFsaXN0LiBJdCBjYW4gbWFrZSBhIGJpZyBkaWZmZXJlbmNlIHRv 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    Message 24


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    Time: 02:00:39 PM PST US
    Subject: Re: Eyesight
    From: "AircamperN11MS" <Scott.liefeld@lacity.org>
    Wow Jeff, you do know a lot about eyes. You know I was just ribbing you. Thanks for all your work in the field. Cheers, -------- Scott Liefeld Flying N11MS since March 1972 Steel Tube C-85-12 Wire Wheels Brodhead in 1996 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=427580#427580


    Message 25


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    Time: 03:32:19 PM PST US
    From: Michael Perez <speedbrake@sbcglobal.net>
    Subject: Re: NX992WD Initial W.& B.
    Scott, yes, from day one my priority was building light...very light. Secon d priority was performance, (which ties in very tightly with light weight) and last was aesthetics. The house latex comes out of the can quite thick, however, I was able to brush it on quite thin and quite well into the weave of the fabric. Even after 4 coats, the weave is still visible some...which I like.- It is very obvious on top of the wings where the brush strokes, uneven paint application, etc. are evident. The wing top already looks som ewhat "sun cooked", if you will. But, I prefer that kind of look and have n o intentions on "fixing" it. The paint is sound and it will protect my hang ared aircraft just fine.=0A=0AI really did go out of my way to reduce the w eight of the aircraft and am very pleased with the result. I really hope it shows in the performance, once I start flight testing and dialing it all i n.=0A=0AAll in due time...=0A=0AIf God is your co-pilot, switch seats=0AMik e Perez=0AKaretaker Aero=0AWorking W.& B. Numbers


    Message 26


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    Time: 04:12:28 PM PST US
    Subject: Re: NX992WD Initial W.& B.
    From: Gene Rambo <generambo@msn.com>
    Why not just throw on a known weight in the seat and do the math for the arm rather than the precarious process of climbing in??? Gene On Jul 30, 2014, at 12:53 PM, "taildrags" <taildrags@hotmail.com> wrote: > > Ryan; > > That is exactly what I did to determine the moment arm of the pilot and passenger, and it came out a bit different from the "belly-button" method. Very easy to do, as long as whoever is doing the weighing remembers to weigh themselves on the same scales either before or after weighing the airplane. > > -------- > Oscar Zuniga > Medford, OR > Air Camper NX41CC &quot;Scout&quot; > A75 power > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=427557#427557 > > > > > > > > > > >


    Message 27


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    Time: 04:34:29 PM PST US
    Subject: Re: spar strength
    From: "gsnewsome" <newfaithkat@windstream.net>
    Very interested in this thread. One of my main concerns with the Piet is with available useful load. Greg Read this topic online here: http://forums.matronics.com/viewtopic.php?p=427585#427585


    Message 28


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    Time: 05:15:30 PM PST US
    Subject: Re: spar strength
    From: "pjb" <pjb@ornithopter-pilot.com>
    taildrags wrote: > > .....So is anyone using a 1" thick spar anymore? .... Yes, I used 1" thick spars on my one-piece wing. Patricia Read this topic online here: http://forums.matronics.com/viewtopic.php?p=427586#427586 Attachments: http://forums.matronics.com//files/tn_dsc00247_167.jpg


    Message 29


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    Time: 05:16:05 PM PST US
    From: Doug <chiefpepperhead@hotmail.com>
    Subject: spar strength
    Keep in mind the front spar carries the bulk of the load depending on aero dynamic loading. Doug Dever =0A In beautiful Stow Ohio From: larharris2@msn.com Subject: RE: Pietenpol-List: spar strength =0A =0A =0A I'm in. I would very much like to justify an increase over the original 10 80 lb gross weight. I did a few rough calculations of the weight bearing capability of a 1" sol id spar. At first I just plugged a few numbers into a formula & got a prepo sterous answer. Then I studied the problem a bit more and got a more reason able=2C although discouraging=2C answer. Assumption: Spanwise loading is uniform (not true=2C but the calculated err or is small). My INVALID assumption was that the 2 spars (without struts) are carrying the entire flight load. >From Understanding Wood by Bruce Hoadly=2C MR[Modulus of Rupture] = 1.5 ( Pmax (L))/ b(d^2) 12% dry Sitka Spruce MR= 10=2C200 psi b= 1" (spar thickness) d= 4.75" (spar depth) L= 13.5 ft (total distance to the center of each wing panel=2C without th e 'center' supported by the cabanes) The arithmetic says that each unsupported spar can carry 952 Lb at failure. Double that to 1894 lb because of the 2 spars. The struts=2C therefore=2C are essential for flight. A structural analysis of spars + struts is not a trivial exercise. I have the reference texts to help me dig through it=2C but it will take some more time. More to follow. Lorenzo =0A =0A =0A =0A ============0A ============0A ============0A ============0A =0A


    Message 30


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    Time: 05:17:54 PM PST US
    From: Doug <chiefpepperhead@hotmail.com>
    Subject: Eyesight
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    Message 31


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    Time: 05:26:59 PM PST US
    From: "Boatright, Jeffrey" <jeffboatright@emory.edu>
    Subject: Re: Eyesight
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    Message 32


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    Time: 06:10:05 PM PST US
    Subject: Re: spar strength
    From: Ken Bickers <bickers.ken@gmail.com>
    Oscar, I used 1" routed spars on a three piece wing. Ken On Wed, Jul 30, 2014 at 6:14 PM, pjb <pjb@ornithopter-pilot.com> wrote: > > > taildrags wrote: > > > > .....So is anyone using a 1" thick spar anymore? .... > > > Yes, I used 1" thick spars on my one-piece wing. > > Patricia > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=427586#427586 > > > Attachments: > > http://forums.matronics.com//files/tn_dsc00247_167.jpg > >


    Message 33


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    Time: 07:03:30 PM PST US
    Subject: Re: Andrew King
    From: "Baldeagle" <baldeagle27@earthlink.net>
    Done- - -------- do not archive Read this topic online here: http://forums.matronics.com/viewtopic.php?p=427592#427592


    Message 34


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    Time: 07:04:14 PM PST US
    Subject: Re: spar strength
    From: Gene Rambo <generambo@msn.com>
    As far as I can tell the 3/4 spar is the exception... Gene On Jul 30, 2014, at 1:04 PM, "taildrags" <taildrags@hotmail.com> wrote: > > Jim Hyde, this discussion is not intended for you, but you're welcome to read on. Since my previous post on this subject had no calculations behind it, I've decided to run some numbers for my own information. Anyone else who is interested, I'll use this thread to keep the discussion separate from Mike Cuy's W&B and out of the hands of those who don't care. If you are of the opinion that "it works, leave it alone" and "I'm just going to bump my own airplane's max gross to 1300 because other guys have", then please use your key when you see posts with the subject line "spar strength". > > So is anyone using a 1" thick spar anymore? My sense is that everyone uses either a solid 3/4" spar or a routed 3/4" spar these days. The few who build box spars (the UK style) are in an entirely different category, because that spar was developed with both calculations *and* load testing behind it. My interest is in running the calculations for those who build to the plans. > > -------- > Oscar Zuniga > Medford, OR > Air Camper NX41CC &quot;Scout&quot; > A75 power > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=427558#427558 > > > > > > > > > > >


    Message 35


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    Time: 07:30:27 PM PST US
    From: "Jack Phillips" <jack@bedfordlandings.com>
    Subject: spar strength
    There you go being practical again, Gene... Jack Phillips NX899JP Smith Mountain Lake, Virginia -----Original Message----- From: owner-pietenpol-list-server@matronics.com [mailto:owner-pietenpol-list-server@matronics.com] On Behalf Of Gene Rambo Sent: Wednesday, July 30, 2014 10:04 PM Subject: Re: Pietenpol-List: spar strength As far as I can tell the 3/4 spar is the exception... Gene On Jul 30, 2014, at 1:04 PM, "taildrags" <taildrags@hotmail.com> wrote: > > Jim Hyde, this discussion is not intended for you, but you're welcome to read on. Since my previous post on this subject had no calculations behind it, I've decided to run some numbers for my own information. Anyone else who is interested, I'll use this thread to keep the discussion separate from Mike Cuy's W&B and out of the hands of those who don't care. If you are of the opinion that "it works, leave it alone" and "I'm just going to bump my own airplane's max gross to 1300 because other guys have", then please use your key when you see posts with the subject line "spar strength". > > So is anyone using a 1" thick spar anymore? My sense is that everyone uses either a solid 3/4" spar or a routed 3/4" spar these days. The few who build box spars (the UK style) are in an entirely different category, because that spar was developed with both calculations *and* load testing behind it. My interest is in running the calculations for those who build to the plans. > > -------- > Oscar Zuniga > Medford, OR > Air Camper NX41CC &quot;Scout&quot; > A75 power > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=427558#427558 > > > > > > > > > > >


    Message 36


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    Time: 07:35:38 PM PST US
    Subject: Re: spar strength
    From: "aerocarjake" <flight.jake@gmail.com>
    My "replacement" rear spar blanks arrived today. They are 1.0" thick an I plan to rout 1/4" deep pockets this weekend - without screwing them up this time....! They were shipped by Aircraft Spruce with edges protected by some metal/cardboard edging and they arrived flawless. -------- Jake Schultz - curator, Newport Way Air Museum (OK, it's just my home) Read this topic online here: http://forums.matronics.com/viewtopic.php?p=427595#427595


    Message 37


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    Time: 09:37:05 PM PST US
    Subject: Re: spar strength
    From: "taildrags" <taildrags@hotmail.com>
    Lorenzo; As a practical matter, I suggest that you use the value of "fiber stress at the elastic limit" for your spars rather than the modulus of rupture. As it is, the old forest product labs data that was published in 1941 for the properties of various woods for aircraft structures has an explanatory note with those values that says there is a significantly wide variation between test specimens of the same wood, same moisture content, taken from the same tree or different trees. They used an average value, but did your wood come from the average tree? And are the trees that are being cut today the same as the ones in the forest in the first half of the 20th century, when most of the wood design books were written and the research on wood for airplanes conducted? With that said, understand that the fiber stress at the elastic limit is presented in the tables for a load duration of only 3 seconds. Considering that the normal category for G loading is +3.8G and that that loading can occur in a coordinated 75 degree bank, 3 seconds is probably a good safe thing to design for and "elastic limit" means that there is no permanent deformation of the spar as a result. Let's not fly rigorous high-G maneuvers in our Piets, eh? Modulus of rupture, on the other hand, means if the wood sees it you're going to rebuild a permanently broken wing after you land, or it's going to break off in the air and you crash. When the spar experiences this kind of load, it's irreversibly damaged. This has never happened to a Piet in the air (in the records, anyway)- so we don't want to spoil the safety record and design to the modulus of rupture just to get our name in the history books. Let's use the elastic limit. Practically speaking, that's 6200 psi for spruce and 8000 psi for Douglas fir. Gene; point well taken. My analysis will be for 1" solid and routed spars, both spruce and fir. The 3/4" spar will be the exception. Doug; another point well taken, and understood. Evans and others suggest a load fraction on the main spar of 70% of the total loading on the wing section, at maximum lift. That's the value I'm using in my analysis. The rear spar carries less than half of the total loading on the section, but that doesn't mean we don't need it! Patricia: what a beautiful piece of woodwork! Thanks for sharing the photo of your wing. I am always mesmerized by the intricate geometry of wood-framed wings. -------- Oscar Zuniga Medford, OR Air Camper NX41CC &quot;Scout&quot; A75 power Read this topic online here: http://forums.matronics.com/viewtopic.php?p=427597#427597




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