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byoungplumbing(at)gmail.c
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 Posted: Mon Oct 28, 2013 9:18 am Post subject: best way i have found to set alignment for tracking |
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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 apart 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 measured 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 tangent 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
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roy.spangler(at)kirtland.
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| Posted: Tue Oct 29, 2013 4:20 am Post subject: best way i have found to set alignment for tracking |
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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(at)gmail.com (byoungplumbing(at)gmail.com)> wrote:
[quote] 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 apart 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 measured 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 tangent 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
[b]
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