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brubakermal(at)yahoo.com
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 Posted: Fri Feb 19, 2010 10:34 am Post subject: wheel toe and the math |
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converting angle of degrees from the number of inchees the tow in i have over a six foot measurement ???? no wonder people just guess
Malcolm Brubaker
Michigan Sport
Pilot Repair
LSRM-A, PPC, WS
(989)513-3022
--- On Fri, 2/19/10, Noel Loveys <noelloveys(at)yahoo.ca> wrote:
| Quote: |
From: Noel Loveys <noelloveys(at)yahoo.ca>
Subject: RE: re: wheel tracking
To: kitfox-list(at)matronics.com
Date: Friday, February 19, 2010, 2:18 PM
Whether you want toe in or toe out depends on whether you have conventional gear or tricycle gear.
On conventional gear toe in will make the plane very squirrely while landing. If the tail goes one side or other on landing the main gear will swerve the opposite direction this can lead to a ground loop.
On tricycle gear toe in is not really necessary as the CG of the plane tends to keep things straight. However some planes do have a little toe in to help assist in keeping the plane straight.
Either way toe in or toe out the shift from straight is usually about 1 degree max.
If you are worried about your bungee gear not being able to handle a little toe out then you better stay away from grass strips where it will get far more workout. These are very light planes and if your tires are wearing on the outside it sounds to me like you have way too much toe in.
My plane a model III-A ( That is what it was sold as by Denney) The toe in can only be changes by de-tempering the welds of the legs, using brute force, then re-tempering the joints. If your axel stub is bolted to the leg/s then I assume you do have a spring leg.
Noel
From: owner-kitfox-list-server(at)matronics.com [mailto:owner-kitfox-list-server(at)matronics.com] On Behalf Of PMorel
Sent: February 18, 2010 12:45 PM
To: brubakermal(at)yahoo.com; kitfox-list(at)matronics.com
Subject: Kitfox-List: re: wheel tracking
Malcolm
Before you consider attempting to change the tracking of your wheels, consider this. What I'm talking about is the gear leg that uses bungee cords and not the grove gear. With bungee cords, the gear is toe in to keep the bungee cords from extending and wheels spreading outward during taxi and take-off. Naturally, if the wheels were toe out, then the gears would want to spread out and the bungee cords would stretch. The perfect scenario would be to have a straight track, but even with that, I think you may be looking for a potential problem. You need to decide if replacement of the tires and expense outweighs the possibility of bungee cord breaking and more expensive damage and repairs.
Paul Morel
Model IV Speedster
Locust Grove GA
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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| Posted: Fri Feb 19, 2010 11:09 am Post subject: wheel toe and the math |
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You’re right... I did the math and while I didn’t come up with Lowell’s answer, it was close enough for government work  , the difference was 0.01 degree.
Noel
From: owner-kitfox-list-server(at)matronics.com [mailto:owner-kitfox-list-server(at)matronics.com] On Behalf Of Malcolm Brubaker
Sent: February 19, 2010 2:55 PM
To: kitfox-list(at)matronics.com
Subject: wheel toe and the math
converting angle of degrees from the number of inchees the tow in i have over a six foot measurement ???? no wonder people just guess
Malcolm Brubaker
Michigan Sport
Pilot Repair
LSRM-A, PPC, WS
(989)513-3022
--- On Fri, 2/19/10, Noel Loveys <noelloveys(at)yahoo.ca> wrote:
From: Noel Loveys <noelloveys(at)yahoo.ca>
Subject: RE: re: wheel tracking
To: kitfox-list(at)matronics.com
Date: Friday, February 19, 2010, 2:18 PM
Whether you want toe in or toe out depends on whether you have conventional gear or tricycle gear.
On conventional gear toe in will make the plane very squirrely while landing. If the tail goes one side or other on landing the main gear will swerve the opposite direction this can lead to a ground loop.
On tricycle gear toe in is not really necessary as the CG of the plane tends to keep things straight. However some planes do have a little toe in to help assist in keeping the plane straight.
Either way toe in or toe out the shift from straight is usually about 1 degree max.
If you are worried about your bungee gear not being able to handle a little toe out then you better stay away from grass strips where it will get far more workout. These are very light planes and if your tires are wearing on the outside it sounds to me like you have way too much toe in.
My plane a model III-A ( That is what it was sold as by Denney) The toe in can only be changes by de-tempering the welds of the legs, using brute force, then re-tempering the joints. If your axel stub is bolted to the leg/s then I assume you do have a spring leg.
Noel
From: owner-kitfox-list-server(at)matronics.com [mailto:owner-kitfox-list-server(at)matronics.com] On Behalf Of PMorel
Sent: February 18, 2010 12:45 PM
To: brubakermal(at)yahoo.com; kitfox-list(at)matronics.com
Subject: re: wheel tracking
Malcolm
Before you consider attempting to change the tracking of your wheels, consider this. What I'm talking about is the gear leg that uses bungee cords and not the grove gear. With bungee cords, the gear is toe in to keep the bungee cords from extending and wheels spreading outward during taxi and take-off. Naturally, if the wheels were toe out, then the gears would want to spread out and the bungee cords would stretch. The perfect scenario would be to have a straight track, but even with that, I think you may be looking for a potential problem. You need to decide if replacement of the tires and expense outweighs the possibility of bungee cord breaking and more expensive damage and repairs.
Paul Morel
Model IV Speedster
Locust Grove GA
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Noel Loveys
Kitfox III-A
Aerocet 1100 Floats |
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