Today's Message Index:
----------------------
1. 12:03 AM - Re: Weight & Balance (Larry Bourne)
2. 12:06 AM - Re: Returning to flight status (Larry Bourne)
3. 01:53 AM - Re: Biennial flight reviewspwer off at stall (Vincehallam@aol.com)
4. 03:39 AM - Re: Momument Valley (Ted Cowan)
5. 04:01 AM - Re: Biennial flight reviewspwer off at stall (Vincehallam@aol.com)
6. 05:26 AM - Re: Weight & Balance (FRED2319@aol.com)
7. 06:17 AM - Re: Weight & Balance (Bob Bean)
8. 06:28 AM - "Hey, ya'll, watch this." (possums)
9. 07:05 AM - Re: Kolb-List Digest: 19 Msgs - 04/14/03 (Dalewhite@aol.com)
10. 07:24 AM - Re: Re: Momument Valley (Larry Bourne)
11. 07:49 AM - Re: Weight & Balance (Larry Bourne)
12. 08:06 AM - Re: Weight & Balance (Larry Bourne)
13. 09:25 AM - Re: Latex paint on aircraft (FRED2319@aol.com)
14. 09:25 AM - bianual (boyd young)
15. 10:38 AM - Re: Weight & Balance (CaptainRon)
16. 03:39 PM - Re: Weight & Balance (Duncan McBride)
17. 04:12 PM - Re: Weight & Balance (Guy Swenson)
18. 04:50 PM - new owner of ultrastar (ronnie wehba)
19. 05:21 PM - Re: Weight & Balance (Eugene Zimmerman)
20. 05:25 PM - Helnet/Headset/INterson F/S (William George)
21. 05:25 PM - Re: Kolb-List Digest: 16 Msgs - 04/13/03 (Lawrence M. Rice)
22. 06:39 PM - Re: Weight & Balance (Bob Bean)
23. 07:15 PM - Re: Weight & Balance (Christopher Armstrong)
24. 07:27 PM - Re: Weight & Balance (FIXERJONES@aol.com)
25. 08:02 PM - Re: Evo/Air (woody)
26. 09:13 PM - Re: "Hey, ya'll, watch this." (jerb)
Message 1
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| Subject: | Re: Weight & Balance |
--> Kolb-List message posted by: "Larry Bourne" <biglar@gogittum.com>
About a year ago, I asked everyone what their numbers were, and mine were -
proportionately - pretty close. I showed 287 on the right wheel, 292 on the
left, and 89 on the tailwheel, at 9 deg. angle of attack. That's real
heavy, I know, but keep that big hunk of engine in mind. My concern
is - - - - why the discrepancy ?? Which numbers do I believe, and which
numbers do I show the DAR ??.............and in all serious-ness, if it IS
way tail heavy, a stall could well be un-recoverable. Good way to ruin a
day, eh ?? My inclination is to go with the FAA worksheet, but it - still -
don't - feel -right - ! ! ! Lar.
Larry Bourne
Palm Springs, CA
Kolb Mk III - Vamoose
www.gogittum.com
----- Original Message -----
From: "Richard Pike" <rwpike@charter.net>
Subject: Re: Kolb-List: Weight & Balance
> --> Kolb-List message posted by: Richard Pike <rwpike@charter.net>
>
> Something doesn't sound right.
> Why not post the #s that you are showing on your forms and let the listers
> see how it compares with theirs?
> Some times we fail to see the forests for the trees.
>
> Richard Pike
> MKIII N420P (420ldPoops)
>
> Do Not Archive
>
>
> At 02:40 PM 4/14/03 -0700, you wrote:
>
> >--> Kolb-List message posted by: "Larry Bourne" <biglar@gogittum.com>
> >
> >Today we did the weight & balance on Vamoose, and have come up with a
> >serious question/problem. We put the wheels on scales, then lifted the
> >tail till a level held on the wing trailing edge tube was 7 1/2" inches
> >below the leading edge tube, as per the instructions, to give a 9 deg.
Message 2
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| Subject: | Re: Returning to flight status |
--> Kolb-List message posted by: "Larry Bourne" <biglar@gogittum.com>
Wonderful news, Ken. Good for you, and good for the way you went about it.
Lar. Do not Archive.
Larry Bourne
Palm Springs, CA
Kolb Mk III - Vamoose
www.gogittum.com
----- Original Message -----
From: "Fackler, Ken" <kfackler@ameritech.net>
Subject: Kolb-List: Returning to flight status
> --> Kolb-List message posted by: "Fackler, Ken" <kfackler@ameritech.net>
>
> Well, friends, yesterday was the Big Day for me. I flew for the first time
> since effectively losing the use of my right eye nearly two months back. I
> first went for a couple of hours with a friend in a Cessna 152. When that
> went well, I then took my trusty old Kolb outta the hangar, blew off the
> dust, and got in a couple of nice hour-long flights in the afternoon.
>
> Man, it do feel good to be back in the sky!
>
> Thank you, more than I can express, to all the many messages of
> encouragement and support and advice that I received from people here on
the
> List. You all were great!
>
> -Ken Fackler
> Mark II / 503
> Rochester MI
>
> DO NOT ARCHIVE
>
>
Message 3
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| Subject: | Re: Biennial flight reviewspwer off at stall |
--> Kolb-List message posted by: Vincehallam@aol.com
I suspect there is a very sharp pitch down leading to negative G in
the cockpit rather than zero G . Several early powered hang gliders with
high keel mounted pushers and even some trikes suffered sharp pitch down
"Tuck" into complete tumble and consequent structural breakup .Not good
Vnz
Message 4
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| Subject: | Re: Momument Valley |
--> Kolb-List message posted by: "Ted Cowan" <tcowan1917@direcway.com>
Hi guys, been awhile since I have laced the keys with my trype. Anyway, got
a couple of friends eager to fly out to Utah from Florida and my lady and I
chasing in a car. Now, seems there might be a small problem with gas and
oil along the way. Was wondering if anyone has a list of potential gas
stops, private air strips, ultralight parks, wonderful Kolb people, etc. for
them to consider as stops. Would certainly appreciate any and all aid in
this respect. Seems to get a little thin out there after Texas and through
New Mexico and almost non-existent past that. A little help with this
would really be a help especially from you guys that ACTUALLY live out
there. Thanks in advance. Can reach me off line at 334-480-0822 or email
direct. Ted Cowan. They are expecting to depart around the 24th of May.
Message 5
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| Subject: | Re: Biennial flight reviewspwer off at stall |
--> Kolb-List message posted by: Vincehallam@aol.com
I should have said that with the high thrust line and low Cof G and
with power on stall ---then all that stuff about "Tuck"..... i.e. the wing
tries to "fly" on its own round the almost stationary centre of gravity, by
the VERY shot time it has got past the vertical the momentum of the Cof G
carries it forward over the wing which also by now is subject to high
negative air loads aggravating the pitch down and converting it to a
continued tumble .. I think our friend wisely doesnt even like or want to
feel any of that unconfortable negative G when he demonstrates the
stall.....Ithink the long tail arm and larg tail surfaces would not let the
Kolb go into a true tumble but a real hammer head stall is tough on any
plane things like batteries come loose or tailwires break, maps get
lost..........
Vnz
Message 6
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| Subject: | Re: Weight & Balance |
--> Kolb-List message posted by: FRED2319@aol.com
Larry A simple way to check is to raise the tail until the plane is balanced
on the main wheels. Them project a vertical line to the wing. That is the
balance point of the wing.
Message 7
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| Subject: | Re: Weight & Balance |
--> Kolb-List message posted by: Bob Bean <slyck@frontiernet.net>
Fred, thanks - elegantly simple and no possible math errors! -although
the FAA in their bureaucratic way likes to see numbers. One caution,
more than one guy has gone "whoops" after he lifted the tail too high
and ......... -BB do not archive
FRED2319@aol.com wrote:
>--> Kolb-List message posted by: FRED2319@aol.com
>
>Larry A simple way to check is to raise the tail until the plane is balanced
>on the main wheels. Them project a vertical line to the wing. That is the
>balance point of the wing.
>
>
>
>
Message 8
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| Subject: | "Hey, ya'll, watch this." |
--> Kolb-List message posted by: possums <possums@mindspring.com>
I'm sure you already know this - but you need a very accurate scale under
the tail wheel
when you do these measurements. Most bathroom scales are not.
A small difference in weight - way back there - makes a big difference
in your numbers.
Oh... ..and don't forget get to yell
"Hey, ya'll, watch this."
When you take it up for the first time.
At 12:01 AM 4/15/2003 -0700, you wrote:
>--> Kolb-List message posted by: "Larry Bourne" <biglar@gogittum.com>
>
>About a year ago, I asked everyone what their numbers were, and mine were -
>proportionately - pretty close. I showed 287 on the right wheel, 292 on the
>left, and 89 on the tailwheel, at 9 deg. angle of attack. That's real
>heavy, Which numbers do I believe, and which
>numbers do I show the DAR ??.............and in all serious-ness, if it IS
>way tail heavy, a stall could well be un-recoverable. Good way to ruin a
>day, eh ?? My inclination is to go with the FAA worksheet, but it - still -
>don't - feel -right - ! ! ! Lar.
>
>Larry Bourne
Message 9
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| Subject: | Re: Kolb-List Digest: 19 Msgs - 04/14/03 |
--> Kolb-List message posted by: Dalewhite@aol.com
Please remove us from this mailing list. We do not wish to received the
Kolb-List Digest anymore.
Thank you,
Dale White
dalewhite@aol.com
Message 10
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| Subject: | Re: Momument Valley |
--> Kolb-List message posted by: "Larry Bourne" <biglar@gogittum.com>
Looks like you'll miss us, then. Monument Valley trip is planned for May 19
& 20, with some of us making a stop at George Thompson's airpark north of
Prescott on the 17th. Will Uribe & Dave Rains can help you with fuel.
Lar. Do not Archive.
Larry Bourne
Palm Springs, CA
Kolb Mk III - Vamoose
www.gogittum.com
----- Original Message -----
From: "Ted Cowan" <tcowan1917@direcway.com>
Subject: Kolb-List: Re: Momument Valley
> --> Kolb-List message posted by: "Ted Cowan" <tcowan1917@direcway.com>
>
> Hi guys, been awhile since I have laced the keys with my trype. Anyway,
got
> a couple of friends eager to fly out to Utah from Florida and my lady and
I
> chasing in a car. Now, seems there might be a small problem with gas and
> oil along the way. Was wondering if anyone has a list of potential gas
> stops, private air strips, ultralight parks, wonderful Kolb people, etc.
for
> them to consider as stops. Would certainly appreciate any and all aid in
> this respect. Seems to get a little thin out there after Texas and
through
> New Mexico and almost non-existent past that. A little help with this
> would really be a help especially from you guys that ACTUALLY live out
> there. Thanks in advance. Can reach me off line at 334-480-0822 or email
> direct. Ted Cowan. They are expecting to depart around the 24th of May.
>
>
Message 11
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| Subject: | Re: Weight & Balance |
--> Kolb-List message posted by: "Larry Bourne" <biglar@gogittum.com>
I've had quite a few replies, both on, and off, List. I appreciate the
responses, but I still don't know the answer to my original
question.......................why the discrepancy between the FAA form, and
the Kolb one. According to the FAA form, my empty c.g. is at 29%, which is
good. Going by the Kolb one, empty c.g. is 44%, which is not. That's a big
difference. How many of you have used the Kolb forms in the blueprints ??
How many have used FAA form AC 43.13-1B ?? How many have tried both, and
how did it work out ?? To those who've offered to crunch the numbers for
me, I'll email my A&P, and get them to you in a day, or so. To get the
plane thru inspection, I can just use the FAA form and be perfectly legal,
but that doesn't help the tingling feeling in my neck. Thanks much.
Worried Ol' Lar.
Larry Bourne
Palm Springs, CA
Kolb Mk III - Vamoose
www.gogittum.com
----- Original Message -----
From: <FRED2319@aol.com>
Subject: Re: Kolb-List: Weight & Balance
> --> Kolb-List message posted by: FRED2319@aol.com
>
> Larry A simple way to check is to raise the tail until the plane is
balanced
> on the main wheels. Them project a vertical line to the wing. That is the
> balance point of the wing.
>
>
Message 12
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| Subject: | Re: Weight & Balance |
--> Kolb-List message posted by: "Larry Bourne" <biglar@gogittum.com>
We set the plane up on the scales to have the wing at 9 deg angle of attack.
Leading edge of the wing is the datum point, wheel axle is 5 1/2" negative.
FAA form showed it at 29% empty. Kolb form showed it at 44% empty; 39.5%
with me in it - 195 # at 4" forward. I've emailed my A&P, and asked him to
send me his numbers. Gotta go to work now; we'll see if he sends them
today. Thanks again, all. Lar.
Larry Bourne
Palm Springs, CA
Kolb Mk III - Vamoose
www.gogittum.com
----- Original Message -----
From: "Larry Bourne" <biglar@gogittum.com>
Subject: Re: Kolb-List: Weight & Balance
> --> Kolb-List message posted by: "Larry Bourne" <biglar@gogittum.com>
>
> About a year ago, I asked everyone what their numbers were, and mine
were -
> proportionately - pretty close. I showed 287 on the right wheel, 292 on
the
> left, and 89 on the tailwheel, at 9 deg. angle of attack. That's real
> heavy, I know, but keep that big hunk of engine in mind. My concern
> is - - - - why the discrepancy ?? Which numbers do I believe, and which
> numbers do I show the DAR ??.............and in all serious-ness, if it IS
> way tail heavy, a stall could well be un-recoverable. Good way to ruin a
> day, eh ?? My inclination is to go with the FAA worksheet, but it -
still -
> don't - feel -right - ! ! ! Lar.
>
> Larry Bourne
> Palm Springs, CA
> Kolb Mk III - Vamoose
> www.gogittum.com
>
> ----- Original Message -----
> From: "Richard Pike" <rwpike@charter.net>
> To: <kolb-list@matronics.com>
> Subject: Re: Kolb-List: Weight & Balance
>
>
> > --> Kolb-List message posted by: Richard Pike <rwpike@charter.net>
> >
> > Something doesn't sound right.
> > Why not post the #s that you are showing on your forms and let the
listers
> > see how it compares with theirs?
> > Some times we fail to see the forests for the trees.
> >
> > Richard Pike
> > MKIII N420P (420ldPoops)
> >
> > Do Not Archive
> >
> >
> > At 02:40 PM 4/14/03 -0700, you wrote:
> >
> > >--> Kolb-List message posted by: "Larry Bourne" <biglar@gogittum.com>
> > >
> > >Today we did the weight & balance on Vamoose, and have come up with a
> > >serious question/problem. We put the wheels on scales, then lifted the
> > >tail till a level held on the wing trailing edge tube was 7 1/2" inches
> > >below the leading edge tube, as per the instructions, to give a 9 deg.
>
>
Message 13
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| Subject: | Re: Latex paint on aircraft |
--> Kolb-List message posted by: FRED2319@aol.com
Message 14
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--> Kolb-List message posted by: "boyd young" <by0ung@brigham.net>
How do flight reviews work with the Kolb ?
Do I still have to take it in the Cessna ?
Gotta Fly...
Mike FSII,Color coat soon
i would immagion that it would depend on yur cfi.... i have been able to do mine
in the mkIII
boyd
Message 15
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| Subject: | Re: Weight & Balance |
--> Kolb-List message posted by: CaptainRon <aerialron@yahoo.com>
Hi Lar.
I would note exactly where on the wing cord line my cg
is at. If the cg point is within the first 25% of the
cord line I would not worry about it. If it comes out
at 30% of cord or so I would know that reballancing is
needed.
I cannot figure the logic in the factory W/B form. It
seems to me to be an exercise in sophistry. They
certainly could have come up with something more
traditionally simple.
======================================
--- Larry Bourne <biglar@gogittum.com> wrote:
> --> Kolb-List message posted by: "Larry Bourne"
> <biglar@gogittum.com>
>
> About a year ago, I asked everyone what their
> numbers were, and mine were -
> proportionately - pretty close. I showed 287 on the
> right wheel, 292 on the
> left, and 89 on the tailwheel, at 9 deg. angle of
> attack. That's real
> heavy, I know, but keep that big hunk of engine in
> mind. My concern
> is - - - - why the discrepancy ??
=====
Building M3X
Southern Arizona
http://search.yahoo.com
Message 16
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| Subject: | Re: Weight & Balance |
--> Kolb-List message posted by: Duncan McBride <duncanmcbride@comcast.net>
Here is what I plugged into the Kolb manual. The distances are from the
manual and the weights are measured. I have (ahem) lost a little weight
since I made these calculations. In the last column the moment is
calculated as a percentage of the total chord. The datum is the leading
edge of the wing - that's why the pilot and passenger distances are
negative. Empty weight 609 lbs.
I've flown at 1084 lbs. gross
Typical CG, Full Fuel H
Total Moment/ %CG
Item Weight Distance Moment Total Weight (H*100)/66
Left Wheel 266.5 6.6875 1782.21875
Right Wheel 263.5 6.6875 1762.15625
Tailwheel 79 204.75 16175.25
Pilot 235 -7 -1645
Passenger 0 -7 0
Gas 60 20.5 1230
Total 904 19304.625 21.35467367 32.4
----- Original Message -----
From: "Larry Bourne" <biglar@gogittum.com>
Subject: Re: Kolb-List: Weight & Balance
> --> Kolb-List message posted by: "Larry Bourne" <biglar@gogittum.com>
>
> About a year ago, I asked everyone what their numbers were, and mine
were -
> proportionately - pretty close. I showed 287 on the right wheel, 292 on
the
> left, and 89 on the tailwheel, at 9 deg. angle of attack. That's real
> heavy, I know, but keep that big hunk of engine in mind. My concern
> is - - - - why the discrepancy ?? Which numbers do I believe, and which
> numbers do I show the DAR ??.............and in all serious-ness, if it IS
> way tail heavy, a stall could well be un-recoverable. Good way to ruin a
> day, eh ?? My inclination is to go with the FAA worksheet, but it -
still -
> don't - feel -right - ! ! ! Lar.
>
> Larry Bourne
> Palm Springs, CA
> Kolb Mk III - Vamoose
> www.gogittum.com
>
> ----- Original Message -----
> From: "Richard Pike" <rwpike@charter.net>
> To: <kolb-list@matronics.com>
> Subject: Re: Kolb-List: Weight & Balance
>
>
> > --> Kolb-List message posted by: Richard Pike <rwpike@charter.net>
> >
> > Something doesn't sound right.
> > Why not post the #s that you are showing on your forms and let the
listers
> > see how it compares with theirs?
> > Some times we fail to see the forests for the trees.
> >
> > Richard Pike
> > MKIII N420P (420ldPoops)
> >
> > Do Not Archive
> >
> >
> > At 02:40 PM 4/14/03 -0700, you wrote:
> >
> > >--> Kolb-List message posted by: "Larry Bourne" <biglar@gogittum.com>
> > >
> > >Today we did the weight & balance on Vamoose, and have come up with a
> > >serious question/problem. We put the wheels on scales, then lifted the
> > >tail till a level held on the wing trailing edge tube was 7 1/2" inches
> > >below the leading edge tube, as per the instructions, to give a 9 deg.
>
>
Message 17
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| Subject: | Re: Weight & Balance |
--> Kolb-List message posted by: "Guy Swenson" <guys@rrt.net>
Larry,
My Mk III Xtra empty cg is 43.39%. Don't forget you are the ballast that
brings you into the 25 to 35 %. I used the Weight and Balance info provided
by Kolb to create an excel spread sheet with all of the formulas embedded.
My DAR liked it so much he took a copy of it and is using it on his lap top
when he does inspections. All he has to do is change the formula to make it
aircraft specific (wing cord). If you or anyone else on the list would like
a copy of it please send me your mailing address off list. I'll mail out a
disk, I've found the formulas do not always follow when sent via E-Mail.
Guy S.
MKIII Xtra 56 hrs.
----- Original Message -----
From: "Larry Bourne" <biglar@gogittum.com>
Subject: Kolb-List: Weight & Balance
> --> Kolb-List message posted by: "Larry Bourne" <biglar@gogittum.com>
>
> Today we did the weight & balance on Vamoose, and have come up with a
serious question/problem. We put the wheels on scales, then lifted the tail
till a level held on the wing trailing edge tube was 7 1/2" inches below the
leading edge tube, as per the instructions, to give a 9 deg. angle of
attack. Using form no. AC 43.13-1B, page 10-6, and the airplane empty, we
came up with a c.g. of 29%. Beautiful...............according to the plans,
it should be between 25% & 35%.............right ??
Hokay...............THEN we plugged the numbers into the Kolb form on the
blueprints, and came up with an empty c.g. of 44%. I sat in the plane, we
figured where my navel sat, and my weight, and came up with 39.5%. This is
not good. Why such a discrepancy between the 2 ?? Which one should I go
by, or, which one is the DAR going to want to see ?? Which one is safe to
fly by ?? I'm well aware of the dangers of flying with aft c.g. (or forward
c.g., for that matter) I designed the!
> engine mount to allow moving the engine an inch either way, but it's a
heck of a job, and I'd just as soon leave it be. What are you guys'
thoughts on this ??? This just cost me another week, I think. Monument
Valley is looking less likely. Lar.
>
> Larry Bourne
> Palm Springs, CA
> Kolb Mk III - Vamoose
> www.gogittum.com
>
>
Message 18
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| Subject: | new owner of ultrastar |
BIG_FONT, HTML_FONT_COLOR_RED, HTML_FONT_FACE_ODD, MAILTO_LINK,
SPAM_PHRASE_00_01, SUPERLONG_LINE, USER_AGENT_OE)
--> Kolb-List message posted by: "ronnie wehba" <rwehba@wtxs.net>
just bought a very nice ultrastar, how do i do a W/B ,,,and any thing else I need
to know" I now fly a a0-84 hurc powerede minimax. any help? thanks ron in central
texas. reply to rwehba@wtxs.net
Message 19
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| Subject: | Re: Weight & Balance |
--> Kolb-List message posted by: Eugene Zimmerman <eugenezimmerman@dejazzd.com>
FRED2319@aol.com wrote:
>
> --> Kolb-List message posted by: FRED2319@aol.com
>
> Larry A simple way to check is to raise the tail until the plane is balanced
> on the main wheels. Them project a vertical line to the wing. That is the
> balance point of the wing.
>
Sorry,
I disagree with this information and believe it is DANGEROUSLY and
SERIOUSLY INACCURATE.
EZ
Message 20
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| Subject: | Helnet/Headset/INterson F/S |
--> Kolb-List message posted by: William George <wgeorge@mountainmeadowranch.com>
Hi Gang,
I have my Comtronics Instruct-A-Com system on ebay. Two helmets with
integrated headsets. Excellent condition. I went to G/A system a long time
ago and these have been stored in my office.
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=26440&item
=2411323208&rd=1
Whew!
do not archive
Bill George
Kolb Mk-3/Verner1400SVS/Powerfin 68" "F"
Message 21
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| Subject: | Re: Kolb-List Digest: 16 Msgs - 04/13/03 |
--> Kolb-List message posted by: "Lawrence M. Rice" <tailwind5@juno.com>
Folks,
Thanks so mush for the paint/fabric info!
Larry the MicroMong guy
DO NOT ARCHIVE
Message 22
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| Subject: | Re: Weight & Balance |
--> Kolb-List message posted by: Bob Bean <slyck@frontiernet.net>
EZ and others, it probably wouldn't work too well with a B-52
-How about just putting a sheet of padded plywood under each wing
and balancing it on tall skinny sawhorses? Ya have to admit that
WOULD be the cg. The only serious problem is with a configuration
where the weight is strung out vertically like a Kolb or some seaplanes
with the engine sticking way up on a pylon. -Then in an extreme nose-
high or low position your cg actually travels. That's the real reason
you shouldn't mount an O-360 on your FF. -BB do not archive
Eugene Zimmerman wrote:
>--> Kolb-List message posted by: Eugene Zimmerman <eugenezimmerman@dejazzd.com>
>
>FRED2319@aol.com wrote:
>
>
>>--> Kolb-List message posted by: FRED2319@aol.com
>>
>>Larry A simple way to check is to raise the tail until the plane is balanced
>>on the main wheels. Them project a vertical line to the wing. That is the
>>balance point of the wing.
>>
>>
>>
>Sorry,
>
>I disagree with this information and believe it is DANGEROUSLY and
>SERIOUSLY INACCURATE.
>
>EZ
>
>
>
>
Message 23
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| Subject: | Weight & Balance |
--> Kolb-List message posted by: "Christopher Armstrong" <cen33475@CenturyTel.net>
-How about just putting a sheet of padded plywood under each wing
and balancing it on tall skinny sawhorses? Ya have to admit that
WOULD be the cg.
if it happened to end up balancing at the flight attitude then that would be
the cg.... but in reality you can get the plane to balance in any attitude.
if your suport is directly above or below the cg then it would balance.
What your trying to find is the longitudinal cg in the flight attitude. in
order to do that you need to be in the flight attitude, and then if you
found the balance point by moving the suport location, keeping the attitude
fixed you would have the longitudinal cg. You can also find the vertical
and lateral cgs.
Again this is not difficult math at all. there are only 8 numbers to work
with. distances to 3 wheels, weight of each wheel, total weight and
distance to cg.
cg distance = (wheel1 wt.*wheel1 dis.+wheel2 wt.* wheel2 dis.+wheel3 wt.*
wheel3 dis.)/total weight
empty weight cg is not real useful, where the loaded cg is matters.
Message 24
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| Subject: | Re: Weight & Balance |
--> Kolb-List message posted by: FIXERJONES@aol.com
yes, the math that really matters is the weight during flight,,1 person& min.
fuel,,
then 2 persons & max fuel =min.& max flight envlope useable.
hopefully they fall with in the cg limit, if not, change a fixed item or add
weight to correct cg limits
do not arcive
Message 25
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--> Kolb-List message posted by: woody <duesouth@govital.net>
Topher gave a good explanation of resonance. I touched on it awhile ago
when I suggested you not go to a 2:1 ratio but vary it a bit. Can you use a
slightly different sprocket? Might make all the difference in the world and
is a cheap fix.
>There are points in the power up that she is smooth as glass and others
>where it feels like a 90lb jack hammer!
>more then likely you are hitting points of torsional resonance. If you stay
>at those locations major damage will occur. Not maybe. not eventually.
>but in a mater of minutes or seconds.
Message 26
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| Subject: | Re: "Hey, ya'll, watch this." |
--> Kolb-List message posted by: jerb <ulflyer@airmail.net>
Did you weigh it with the tail sitting on the scale in the normal at rest
position or did you elevation the tail & scales to where it was in the
flying attitude?
jerb
At 09:28 AM 4/15/03 -0400, you wrote:
>--> Kolb-List message posted by: possums <possums@mindspring.com>
>
>I'm sure you already know this - but you need a very accurate scale under
>the tail wheel
>when you do these measurements. Most bathroom scales are not.
>A small difference in weight - way back there - makes a big difference
>in your numbers.
>Oh... ..and don't forget get to yell
>"Hey, ya'll, watch this."
>When you take it up for the first time.
>
>
>At 12:01 AM 4/15/2003 -0700, you wrote:
> >--> Kolb-List message posted by: "Larry Bourne" <biglar@gogittum.com>
> >
> >About a year ago, I asked everyone what their numbers were, and mine were -
> >proportionately - pretty close. I showed 287 on the right wheel, 292 on the
> >left, and 89 on the tailwheel, at 9 deg. angle of attack. That's real
> >heavy, Which numbers do I believe, and which
> >numbers do I show the DAR ??.............and in all serious-ness, if it IS
> >way tail heavy, a stall could well be un-recoverable. Good way to ruin a
> >day, eh ?? My inclination is to go with the FAA worksheet, but it - still -
> >don't - feel -right - ! ! ! Lar.
> >
> >Larry Bourne
>
>
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