RV-List Digest Archive

Mon 12/18/06


Total Messages Posted: 21



Today's Message Index:
----------------------
 
     1. 03:43 AM - Re: Wood Prop Loss - Cozy (linn Walters)
     2. 03:47 AM - A65-8 (Donald Nowakowski)
     3. 05:36 AM - Re: Wood Prop Loss - Cozy (glen matejcek)
     4. 06:12 AM - Re: Re: Wood Prop Loss - Cozy (Chuck Jensen)
     5. 06:19 AM - Re: Wood Prop Loss - Cozy (Catto Prop) ()
     6. 08:29 AM - Re: Wood Prop Loss - Cozy (REHughes)
     7. 08:29 AM - New Lycoming Thunderbolt Engine Available (Jon A. Delamarter)
     8. 09:59 AM - Re: Stick-on Trim Tabs (John Danielson)
     9. 10:12 AM - Re: New Lycoming Thunderbolt Engine Available (RV Builder (Michael Sausen))
    10. 10:38 AM - Re: New Lycoming Thunderbolt Engine Available (Jon A. Delamarter)
    11. 01:26 PM - Re: aircraft directory... (Brian Meyette)
    12. 04:51 PM - parachutes in the RV-4 (Larry E. James)
    13. 06:53 PM -  (jim-bean@att.net)
    14. 07:28 PM - Re: Parking Brake (Bobby Hester)
    15. 07:32 PM - Spar mistake! (David Karlsberg)
    16. 07:38 PM - Re:  (Larry Pardue)
    17. 07:40 PM - Re:  (gert)
    18. 07:45 PM - Re: Spar mistake! (Bobby Hester)
    19. 08:13 PM - Re: Spar mistake! (Ron Lee)
    20. 08:45 PM - Re: Parking Brake (Greg Young)
    21. 09:10 PM - Re:  (Richard Dudley)
 
 
 


Message 1


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    Time: 03:43:26 AM PST US
    From: linn Walters <pitts_pilot@bellsouth.net>
    Subject: Re: Wood Prop Loss - Cozy
    Agreed! I'm no expert and wasn't going to comment, but here goes. The black scorch marks on the engine prop hub is indicative of prop bolts that weren't torqued to spec. This can occur when a wood prop changes climates ...... a more moist climate will cause the wood to swell, and a drier climate will cause the wood to shrink. On a new prop, it my take quite a while for the changes to take place due to the really good varnish job it gets. So, it's scenario time: Let's say the prop was made in a moist climate expressly for an experimental aircraft. Props made for certificated aircraft have strict moisture content specs and may/may not be comparable to our scenario. The new prop is shipped to the desert SW, is installed and torqued to spec. The airplane is flown and the varnish is compromised through rock nicks and maybe some rain. Now the prop can dry out a little, shrink, and the bolt torque is now out of spec on the loose side. This will allow the prop hub to flex and rub on the prop flange and the pressure plate. This creates heat, which further dries out the hub, making it looser still. The heating/cooling cycles now will accelerate the damage until the prop bolts start to flex ..... and eventually they will fatigue and fail. The end (and predictable) result is the glider ride. For a new prop, it's prudent to check the bolt torque often. Linn do not archive Charlie England wrote: > > Hopperdhh@aol.com wrote: > >> In a message dated 12/17/2006 8:40:46 AM Eastern Standard Time, >> kboatright1@comcast.net writes: >> >> For those of us who fly behind wood props, this is a good >> read. It may give some indication of the symptoms of a wood prop >> beginning to fail. And then failing... ;-) >> http://www.cozybuilders.org/Desert_Center/ >> Kyle Boatright >> 2001 RV-6 >> Aymar Demuth Prop >> >> Great story and pictures, Kyle. Marc did a great job. Things could >> have been a lot worse. >> >> do not archive >> >> Dan Hopper >> RV-7A > > > Haven't read the whole thing yet, but there's a glaring error in his > analysis: > > ' My theory is that there was a crack in a blade which was growing, > bringing the resonant frequency of the prop in and out of the RPM > operating range as it got bigger and the vibration mode frequencies > changed. One blade leaves, then 10 seconds later the hub gives up the > ghost.' > > If he had lost a blade, it wouldn't have been 10 seconds; more like 1 > second. And it wouldn't have been just the prop that departed. > > Less than an ounce off a tip will feel like the airframe is coming > apart. An entire blade will likely cause the engine to leave with the > prop. > > Charlie > >


    Message 2


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    Time: 03:47:30 AM PST US
    Subject: A65-8
    From: Donald Nowakowski <nowakod@us.ibm.com>
    Folks, Totally off the RV subject...sorry. Does anyone know of a Continental A-65-8 engine out there for sale? The case broke on my Champ. Guess I'll have to keep flying the -6 until the beloved Champ is back in the air. Not a bad back-up!! :-)......don do not archive Please reply to me directly if you can help....... Don Nowakowski , Equipment Engineering Tech Telephone (802)288-3359, "More than anything else the sensation is one of perfect peace mingled with an excitement that strains every nerve to the utmost, if you can conceive of such a combination." -- Wilbur Wright


    Message 3


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    Time: 05:36:10 AM PST US
    From: "glen matejcek" <aerobubba@earthlink.net>
    Subject: RE: Wood Prop Loss - Cozy
    >Haven't read the whole thing yet, but there's a glaring error in his >analysis: > >' My theory is that there was a crack in a blade which was growing, >bringing the resonant frequency of the prop in and out of the RPM >operating range as it got bigger and the vibration mode frequencies >changed. One blade leaves, then 10 seconds later the hub gives up the >ghost.' > >If he had lost a blade, it wouldn't have been 10 seconds; more like 1 >second. And it wouldn't have been just the prop that departed. >Less than an ounce off a tip will feel like the airframe is coming >apart. An entire blade will likely cause the engine to leave with the prop. > >Charlie I've got to agree with you, Charlie (not that you asked ; - ) ) >From my perspective there is a pretty clear chain of events here. I won't bore the list with my ramblings, but the key cause and effect are that something (such as the victim's move from coastal MA to desert CA) caused dimensional shrinkage of the prop, which loosened it, and led to torsional vibration. This is borne out by the photos of the charring on the face of the prop extension. The reason I comment on the whole affair is that 'back in the day', when I was flying Cubs and Champs, a fellow I think knew Wilbur and Orville advised me to sniff the prop / crank interface when preflighting a wooden prop. If the prop were loose, as can happen from season to season with humidity change, you could smell the charring of the varnish. Perhaps this preflight technique will help another avoid the same fate. glen matejcek aerobubba@earthlink.net


    Message 4


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    Time: 06:12:27 AM PST US
    Subject: RE: Wood Prop Loss - Cozy
    From: "Chuck Jensen" <cjensen@dts9000.com>
    Thanks, Chuck Jensen Diversified Technologies 2680 Westcott Blvd Knoxville, TN 37931 Phn: 865-539-9000 x25 Cell: 865-406-9001 Fax: 865-539-9001 cjensen@dts9000.com -----Original Message----- From: owner-rv-list-server@matronics.com [mailto:owner-rv-list-server@matronics.com] On Behalf Of glen matejcek Sent: Monday, December 18, 2006 8:34 AM Subject: RV-List: RE: Wood Prop Loss - Cozy Glen Matejcek" wrote... The reason I comment on the whole affair is that 'back in the day', when I was flying Cubs and Champs, a fellow I think knew Wilbur and Orville advised me to sniff the prop / crank interface when preflighting a wooden prop. If the prop were loose, as can happen from season to season with humidity change, you could smell the charring of the varnish. Glen, do you recommend sniffing the prop before or after starting the engine??? :-) Chuck


    Message 5


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    Time: 06:19:23 AM PST US
    From: <gmcjetpilot@yahoo.com>
    Subject: Re: Wood Prop Loss - Cozy (Catto Prop)
    Charlie from what I know about wood prop harmonics and fatigue was not the issue, like it can be a failure mode for metal props. I do think it was manufactured or installation error. We are talking a natural material, bonding pieces together. Usually wood props are very reliable but are subject to wear and tear to a greater degree than metal. OF course all wood prop owners should re-torque their prop several times a year depending on changes in weather (temp/humidity). Also the engine may be modified. 180 HP puts out a mean power pulse. With the bolts loose and fretting problems can occure. Also he felt the vibs for 4 weeks before! LESSON if you feel somthing figure it out before flying. I thing the prop just started to fail. Even with tight bolts props take a beating. The problem is if you suspect a problem finding the crack in a fiberglass wrapped wood prop may be hard to do with out some NDT (non destructive test). Catto has had other failures and it was in a racing situation. Not a Catto prop put down but the one that failed was on a formula racer and the bond failed. The way the joint was made was less than ideal. Many times to make up the wood for the prop blank they glue pieces together. I am sure with a three bladed one piece wood prop Catto has to make some interesting joints and bond lines. >>From: Charlie England <ceengland@bellsouth.net> >>Subject: Re: RV-List: Wood Prop Loss - Cozy >>Hopperdhh@aol.com wrote: >> For those of us who fly behind wood props, this is a good >> read. It may give some indication of the symptoms of a wood prop >> beginning to fail. And then failing... ;-) >> >> Dan Hopper >> RV-7A >Haven't read the whole thing yet, but there's a glaring error in his >analysis: >My theory is that there was a crack in a blade which was growing, >bringing the resonant frequency of the prop in and out of the RPM >operating range as it got bigger and the vibration mode frequencies >changed. One blade leaves, then 10 seconds later the hub gives up the >ghost.' >If he had lost a blade, it wouldn't have been 10 seconds; more like 1 >second. And it wouldn't have been just the prop that departed. >Less than an ounce off a tip will feel like the airframe is coming >apart. An entire blade will likely cause the engine to leave with the >prop. >Charlie __________________________________________________


    Message 6


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    Time: 08:29:32 AM PST US
    From: "REHughes" <hawk@digisys.net>
    Subject: Re: Wood Prop Loss - Cozy
    If the prop bolts were "bottomed out" in the drive bushing threads and actually torqued on the bolt shoulders, the resulting failure will look like the instance described here. Examination of the remnants of the threaded portions still retained in the extension should reveal if this might have been the case. Hawkeye Hughes Skyote and RV-3 ----- Original Message ----- From: "linn Walters" <pitts_pilot@bellsouth.net> Sent: Sunday, December 17, 2006 8:05 PM Subject: Re: RV-List: Wood Prop Loss - Cozy > > Agreed! I'm no expert and wasn't going to comment, but here goes. > The black scorch marks on the engine prop hub is indicative of prop bolts > that weren't torqued to spec. This can occur when a wood prop changes > climates ...... a more moist climate will cause the wood to swell, and a > drier climate will cause the wood to shrink. On a new prop, it my take > quite a while for the changes to take place due to the really good varnish > job it gets. So, it's scenario time: Let's say the prop was made in a > moist climate expressly for an experimental aircraft. Props made for > certificated aircraft have strict moisture content specs and may/may not > be comparable to our scenario. The new prop is shipped to the desert SW, > is installed and torqued to spec. The airplane is flown and the varnish > is compromised through rock nicks and maybe some rain. Now the prop can > dry out a little, shrink, and the bolt torque is now out of spec on the > loose side. This will allow the prop hub to flex and rub on the prop > flange and the pressure plate. This creates heat, which further dries out > the hub, making it looser still. The heating/cooling cycles now will > accelerate the damage until the prop bolts start to flex ..... and > eventually they will fatigue and fail. The end (and predictable) result is > the glider ride. For a new prop, it's prudent to check the bolt torque > often. > Linn > do not archive > > Charlie England wrote: > >> >> Hopperdhh@aol.com wrote: >> >>> In a message dated 12/17/2006 8:40:46 AM Eastern Standard Time, >>> kboatright1@comcast.net writes: >>> >>> For those of us who fly behind wood props, this is a good >>> read. It may give some indication of the symptoms of a wood prop >>> beginning to fail. And then failing... ;-) >>> http://www.cozybuilders.org/Desert_Center/ >>> Kyle Boatright >>> 2001 RV-6 >>> Aymar Demuth Prop >>> >>> Great story and pictures, Kyle. Marc did a great job. Things could >>> have been a lot worse. >>> do not archive >>> Dan Hopper >>> RV-7A >> >> >> >> Haven't read the whole thing yet, but there's a glaring error in his >> analysis: >> >> ' My theory is that there was a crack in a blade which was growing, >> bringing the resonant frequency of the prop in and out of the RPM >> operating range as it got bigger and the vibration mode frequencies >> changed. One blade leaves, then 10 seconds later the hub gives up the >> ghost.' >> >> If he had lost a blade, it wouldn't have been 10 seconds; more like 1 >> second. And it wouldn't have been just the prop that departed. >> >> Less than an ounce off a tip will feel like the airframe is coming apart. >> An entire blade will likely cause the engine to leave with the prop. >> >> Charlie >> >> >> >> >> > > >


    Message 7


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    Time: 08:29:32 AM PST US
    Subject: New Lycoming Thunderbolt Engine Available
    From: "Jon A. Delamarter" <jdelamarter@lycoming.textron.com>
    I have a brand-new Thunderbolt IO-390-EXP tested, boxed, & ready to ship from the Lycoming factory here in Williamsport. Please email me for details. (jdelamarter@lycoming.textron.com) Jon A. Delamarter Thunderbolt Manager Lycoming Engines Note: I am purposely ommiting details and pricing in deference to the non-commercial nature of this website. I am posting only after contacting Matt Dralle for permission. Thanks, Matt! -------- Jon A. Delamarter EAA# 780469 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=82243#82243


    Message 8


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    Time: 09:59:57 AM PST US
    From: "John Danielson" <johnd@wlcwyo.com>
    Subject: Stick-on Trim Tabs
    Make your own out of aluminum scrap and use double sided carpet tape to stick in place. Flew mine for 300+ hrs without any problem. John L. Danielson -----Original Message----- From: owner-rv-list-server@matronics.com [mailto:owner-rv-list-server@matronics.com] On Behalf Of Bruce Bell Sent: Saturday, December 16, 2006 9:44 AM Subject: RV-List: Stick-on Trim Tabs Hi All, Looking for stick-on trim tabs. Someone made them but I can't find them. Best for the HOLIDAYS, Bruce Bell Lubbock, Texas RV-4 N23BB 18 hours DO NOT ARCHIVE


    Message 9


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    Time: 10:12:14 AM PST US
    Subject: New Lycoming Thunderbolt Engine Available
    From: "RV Builder (Michael Sausen)" <rvbuilder@sausen.net>
    Umm, you are posting an advertisement so I think that the non-commercial comment is a bit out the window. I'm betting the list members would love a reference point that has pricing and details. I for one would. -----Original Message----- From: owner-rv-list-server@matronics.com [mailto:owner-rv-list-server@matronics.com] On Behalf Of Jon A. Delamarter Sent: Monday, December 18, 2006 10:28 AM Subject: RV-List: New Lycoming Thunderbolt Engine Available <jdelamarter@lycoming.textron.com> I have a brand-new Thunderbolt IO-390-EXP tested, boxed, & ready to ship from the Lycoming factory here in Williamsport. Please email me for details. (jdelamarter@lycoming.textron.com) Jon A. Delamarter Thunderbolt Manager Lycoming Engines Note: I am purposely ommiting details and pricing in deference to the non-commercial nature of this website. I am posting only after contacting Matt Dralle for permission. Thanks, Matt! -------- Jon A. Delamarter EAA# 780469 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=82243#82243


    Message 10


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    Time: 10:38:57 AM PST US
    Subject: Re: New Lycoming Thunderbolt Engine Available
    From: "Jon A. Delamarter" <jdelamarter@lycoming.textron.com>
    rvbuilder(at)sausen.net wrote: > I'm betting the list members would love a reference point that has pricing and details. I for one would. > -- Thunderbolt IO-390-EXP - 210hp Roller Tappets Front propeller governor mount pad Forward facing "A" sump (standard) Precision Static Balancing (Pistons & Rods to 0.5g) Airflow Performance FM-200 fuel injection system, incl Purge Valve (1)Slick Impulse Mag, (1) Slick Plain Mag, ignition harness, sparkplugs Two-tone paint - Thunderbolt Titanium w/Gloss Black Cylinders Chrome rocker covers, intake pipes, and pushroud shroud tubes Starter/Alternator/Vac Pump not included 2year/200hr parts/labor warranty With two-tone paint and chrome options, standard price is $31,930. This unit (only) is available for $29,900 ($2,030 discount) if purchased in 2006. -------- Jon A. Delamarter EAA# 780469 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=82261#82261


    Message 11


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    Time: 01:26:33 PM PST US
    From: "Brian Meyette" <brianpublic2@starband.net>
    Subject: aircraft directory...
    I didnt like what they had, so I made my own. Theirs is also laced with errors. I fixed all the mistakes I could find, and I encourage others to update me with corrections, so we can all make this an ongoing, valuable resource for all of us. I also encourage people to spread it around so all can benefit from it http://brian76.mystarband.net/misc.htm#directory its a spreadsheet, so you can download it and do all sorts of queries and sorts on it and its free brian http://brian76.mystarband.net/RV-7Ahome.htm -----Original Message----- From: owner-rv-list-server@matronics.com [mailto:owner-rv-list-server@matronics.com]On Behalf Of Bill VonDane Sent: Sunday, December 17, 2006 1:05 PM Subject: RV-List: aircraft directory... Has anyone tried to use the aircraft directory on the kitplanes website? It looks like an app I used to use on another website that worked really well, but the one on the kitplanes site doesn't work very well at all... It has a search function that you can input filtering criteria like; kit or plans, cruise speed, landing gear configuration etc.....but it doesn't return aircraft you would expect it to return... I tried several different searches, all of which SHOULD include some, if not all of Van's airplanes, but none were ever returned... I don't get it... I was wondering if anyone else had use this tool and could possible tell me what I am doing wrong, or maybe tell me where the original app is located so I can use it because this one doesn't seem to work... You can access it here if you have a esubscription of kitplanes... http://www.kitplanes.com/aircraftdirectory/ -Bill <http://www.buildersbooks.com> <http://www.homebuilthelp.com> -- 3:17 PM


    Message 12


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    Time: 04:51:25 PM PST US
    From: "Larry E. James" <larry@ncproto.com>
    Subject: parachutes in the RV-4
    Bruce, I'll second all good things you have heard about Paraphernalia. I have had Dan custom build 3 different parachutes for me (including my current Rocket) over the years and I am a very happy customer. Your configuration depends on your body shape and how you want to approach the problem. Larry E. James Bellevue, WA Harmon Rocket


    Message 13


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    Time: 06:53:21 PM PST US
    From: jim-bean@att.net
    All, I installed the catalog parking brake valve on my RV-8 but never figured out how to use it. At first I thought that I could use the little handle by itself. Unfortunately this dream resulted in an almost serious accident when the tiny mass of the tiny handle caused it to jiggle into the closed position. When this happens the next brake application locks the brake. Surprise! At the moment the handle is tie-wrapped into the open position. My post is to ask how others have fabricated a linkage to operate it properly. Simply putting a control cable on it results in reversed operation, IE pulled out would be off. Any ideas? Jim Bean 43 hours now on N99JA


    Message 14


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    Time: 07:28:32 PM PST US
    From: Bobby Hester <bobbyhester@charter.net>
    Subject: Re: Parking Brake
    Hope these help! jim-bean@att.net wrote: > >All, >I installed the catalog parking brake valve on my RV-8 but never figured >out how to use it. At first I thought that I could use the little handle >by itself. Unfortunately this dream resulted in an almost serious >accident when the tiny mass of the tiny handle caused it to jiggle into >the closed position. When this happens the next brake application locks >the brake. Surprise! At the moment the handle is tie-wrapped into the >open position. >My post is to ask how others have fabricated a linkage to operate it >properly. Simply putting a control cable on it results in reversed >operation, IE pulled out would be off. Any ideas? >Jim Bean >43 hours now on N99JA > > > >


    Message 15


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    Time: 07:32:36 PM PST US
    Subject: Spar mistake!
    From: David Karlsberg <claypride@hotmail.com>
    I was back drilling my z brackets on my right wing. Somehow (I really have no idea how this happened) I missed the pre-made hole and now have a new 3/16th inch hole in my spar about a half inch inboard of the second most inboard Z bracket. The hole doesn=B9t interfere with anything and I have adequate distance from all of the other holes. I deburred it, but am concerned it could make the spar weaker... or something. What should I do? Leave it? Fill it with something? Patch it? Order a new spar (I hope not!). I emailed vans too, but wanted to hear what you guys think. Thanks, David


    Message 16


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    Time: 07:38:31 PM PST US
    From: Larry Pardue <n5lp@warpdriveonline.com>
    Subject: Re:
    On Dec 18, 2006, at 7:51 PM, jim-bean@att.net wrote: > > All, > I installed the catalog parking brake valve on my RV-8 but never > figured > out how to use it. At first I thought that I could use the little > handle > by itself. Unfortunately this dream resulted in an almost serious > accident when the tiny mass of the tiny handle caused it to jiggle > into > the closed position. When this happens the next brake application > locks > the brake. Surprise! At the moment the handle is tie-wrapped into the > open position. > My post is to ask how others have fabricated a linkage to operate it > properly. Simply putting a control cable on it results in reversed > operation, IE pulled out would be off. Any ideas? How it operates depends on how you mount it and how you mount the cable clamp. I mounted mine such that pulling the cable closes the valve such that if the brakes were applied, it maintains the hydraulic pressure. I used a ratchet style cable so it stays where you put it. All that being said, I have only used it a couple of times in 7 years.


    Message 17


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    Time: 07:40:49 PM PST US
    From: gert <gert.v@sbcglobal.net>
    Subject: Re:
    The On-Off of-course depends how u mount the valve. mine is mounted such that pulling will close, I got a T handle from ACS with a 1/4 turn lock, i also mounted a spring which pulls the lever into the open position jim-bean@att.net wrote: > > All, > I installed the catalog parking brake valve on my RV-8 but never figured > out how to use it. At first I thought that I could use the little handle > by itself. Unfortunately this dream resulted in an almost serious > accident when the tiny mass of the tiny handle caused it to jiggle into > the closed position. When this happens the next brake application locks > the brake. Surprise! At the moment the handle is tie-wrapped into the > open position. > My post is to ask how others have fabricated a linkage to operate it > properly. Simply putting a control cable on it results in reversed > operation, IE pulled out would be off. Any ideas? > Jim Bean > 43 hours now on N99JA > > > -- ------------------------------------------------------------------- Pursuant to US Code, Title 47, Chapter 5, Subchapter II, '227, any and all nonsolicited commercial E-mail sent to this address is subject to a download and archival fee in the amount of $500 US. E-mailing denotes acceptance of these terms. --------------------------------------------------------------------


    Message 18


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    Time: 07:45:58 PM PST US
    From: Bobby Hester <bobbyhester@charter.net>
    Subject: Re: Spar mistake!


    Message 19


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    Time: 08:13:39 PM PST US
    From: Ron Lee <ronlee@pcisys.net>
    Subject: Re: Spar mistake!
    At 08:31 PM 12/18/2006, you wrote: >I was back drilling my z brackets on my right wing. Somehow (I really have >no idea how this happened) I missed the pre-made hole and now have a new >3/16th inch hole in my spar about a half inch inboard of the second most >inboard Z bracket. The hole doesnt interfere with anything and I have >adequate distance from all of the other holes. I deburred it, but am >concerned it could make the spar weaker... or something. What should I do? >Leave it? Fill it with something? Patch it? Order a new spar (I hope >not!). I emailed vans too, but wanted to hear what you guys think. > >Thanks, >David I would get a good nights sleep and call them about it although a pic is worth a lot. It appears that the deburring did not leave a smooth inner surface. Ron Lee


    Message 20


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    Time: 08:45:07 PM PST US
    From: "Greg Young" <gyoung@cs-sol.com>
    Subject: RE: Parking Brake
    The valve operates by trapping the fluid after you apply the brakes. Apply brakes, close valve and fluid and pressure stay put assuming no leaks. Position the cable so pulling it closes the valve. Use a ratcheting or locking cable so it will stay in either the open or closed position. Regards, Greg Young - Houston (DWH) RV-6 N6GY - project Phoenix Navion N5221K - just an XXL RV-6A Regards, Greg Young > -----Original Message----- > From: owner-rv-list-server@matronics.com > [mailto:owner-rv-list-server@matronics.com] On Behalf Of > jim-bean@att.net > Sent: Monday, December 18, 2006 8:52 PM > To: rv8-list@matronics.com; rv-list@matronics.com > Subject: > > > All, > I installed the catalog parking brake valve on my RV-8 but > never figured out how to use it. At first I thought that I > could use the little handle by itself. Unfortunately this > dream resulted in an almost serious accident when the tiny > mass of the tiny handle caused it to jiggle into the closed > position. When this happens the next brake application locks > the brake. Surprise! At the moment the handle is tie-wrapped > into the open position. > My post is to ask how others have fabricated a linkage to > operate it properly. Simply putting a control cable on it > results in reversed operation, IE pulled out would be off. Any ideas? > Jim Bean > 43 hours now on N99JA >


    Message 21


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    Time: 09:10:56 PM PST US
    From: Richard Dudley <rhdudley1@bellsouth.net>
    Subject: Re:
    Hi Jim, I, too, am using the parking brake from Van's catalog installed in my RV-6A. Though I cannot find a photo to send you, I'll describe the installation. It is mounted on the firewall inside the cockpit to the left of center and near the floor. This seemed to me to be optimal for plumbing. It is in a position so that when the lever is moved upward, it is activated. So, when I pull out the knob of the pull cable, the valve is in th ON position. So, the knob is pushed all the way in for OFF and all the way out for ON. Indeed, in the ON position, the brakes lock with the first press of the brake pedals. It is released by merely pushing the know in. Your description sounds as though you are working the lever in reverse. I have had only a few occasions to use the parking brake, but it works well. Hope this is of some help. Best regards, Richard Dudley -6A flying jim-bean@att.net wrote: > >All, >I installed the catalog parking brake valve on my RV-8 but never figured >out how to use it. At first I thought that I could use the little handle >by itself. Unfortunately this dream resulted in an almost serious >accident when the tiny mass of the tiny handle caused it to jiggle into >the closed position. When this happens the next brake application locks >the brake. Surprise! At the moment the handle is tie-wrapped into the >open position. >My post is to ask how others have fabricated a linkage to operate it >properly. Simply putting a control cable on it results in reversed >operation, IE pulled out would be off. Any ideas? >Jim Bean >43 hours now on N99JA > > > >




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