Today's Message Index:
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1. 05:20 AM - Re: best way i have found to set alignment for tracking (Roy Spangler)
2. 02:24 PM - Re: Xtra Steering Problems (Rex Rodebush)
Message 1
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| Subject: | Re: best way i have found to set alignment for tracking |
Boyd,
Best explanation of alignment on an ac that I've seen. Should be
a big help to a lot of folks.
thanks
roy
On Mon, Oct 28, 2013 at 1:18 PM, b young <byoungplumbing@gmail.com> wrote:
> the best way I have found to check the wheel alignment is to place a
> straight edge behind the mains at axel height.
> then use a carpenter square and align it against the straight edge and
> against the edge of the tire,,,,
> measure from the square to the rim ( not the tire, because of differences
> in the rubber) at the front and rear of the rim.
> repeat for other wheel.
>
> if the measurement from the square to front of the rim is the same as the
> measurement from the square to the back of the rim, the wheel is
> straight, if the front measurement is greater than the rear the wheel
> has toe in. and if the front is less than the rear, the wheel has toe
> out.
>
> for the best tracking on solid surface runway, my mkiii with the solid
> tapered steel gear required about 0.6 deg toe in. on each side.
if
> your gear is more or less stiff the toe in requirements for your plane
> will be different.
>
> I did the math,,, and although it is not 100 % exact,,, it is close
> enough,,,, if the points on the rim front to back are 5.725 inches apar
t
> where you measure to the square, the degree of toe in or toe out
> equals 10 times the different in front and rear measurements as measure
d
> in thousandths of an inch. example,,, if the difference between the
> front and rear measurements is 0.062 thousandths of an inch,,, the toe
> in or out is 0.62 deg
>
> if you want to do your own math,,,, the deg of toe in equals the tangen
t
> of the opposite side divided by the adjacent side.
>
> the tangent of 0.62
> = 0.010821
> opposite side divided by the adjacent 0.062/5.725 = 0.010829
>
> or you can do an inverse tangent function Tan '1 power (
> 0.062/5.725)= 0.6204 or very near 0.062 *10 = 0.62
>
> the way the inverse tangent function looks may vary pending on your
> calculator.
>
> one last thing,,,, when measuring it is best to have the wheel placed on
a
> grease plate, which is made by putting a few pumps of grease between 2
> smooth aluminum plates, or similar materials..
>
> this is probably worth archiving.
>
> boyd young
>
Message 2
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| Subject: | Re: Xtra Steering Problems |
Call Travis and about the steel legs. You won't have to worry about bending them.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=411707#411707
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