yes that is identical to the VLA formula. The vertical load is 2.25 times the static load and 0.8*2.25 = 1.8.For force during spin-up you will need both the friction coefficient and the rotational inertia of the tire/wheel assembly..................maybe even the spring rate to make a formula for the friction during transition. sounds like a lot of work.
But as Dana noted the friction coefficient may be the limiting factor. Here is what ASTM has to say about the nose wheel for LSAs:
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You took the words right out of my mouth!I'd start with the weight on the nosewheel times the coefficient of friction of a tire on concrete as a conservative estimate.
I'd start with the weight on the nosewheel times the coefficient of friction of a tire on concrete as a conservative estimate.
He gives the drag force as 0.8* vertical load.
Seems to all line up pretty well, isn’t the coefficient of friction for rubber on dry concrete about 0.8?Appendix D states that spin up loads need not exceed 0.8 time vertical loads,
It can be much higher. Many production cars an motorcycles have achieved decels greater than 1 g for decades, which means COF substantially greater than unity.Seems to all line up pretty well, isn’t the coefficient of friction for rubber on dry concrete about 0.8?