Rolling drag of aircraft wheels on a grass runway

Jean Claude

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Title: The rolling friction of several airplane wheels and tires and the effects of rolling friction on take-off
Author: J. W. Wetmore
NACA report n° 583
Comment: Interesting measurements of the variations of rolling coefficient according to the runway (concrete, firm turf, soft turf), the type of wheels (standard, low pressure, very low pressure), the differences in inflation pressure, the plain or ball bearings

Sorry for the section mistake
Message now copied to the right place
 
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Martin W.

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Thanks Jean Claude

Years ago I had a hands-on mechanic teacher who had his students pull a car with a rope with a measuring scale to observe the results

1 --- soft tires on level grass
2 --- hard-inflated tires on grass
3 --- soft tires on pavement
4 --- hard tires on pavement

# 4 had the least rolling resistance of course ... but then he surprised us by going to a rail yard to do the same thing on a very heavy rail car .... it was easier to move than the automobile .... steel wheels on steel rails have almost zero rolling friction .... I have never forgotten those lessons .

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Abid

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Thanks for posting this JC
 
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