Jeff Spitzer wrote:

At 04:19 PM 6/18/99 -0700, you wrote:

If you are thinking of your roadable airplane design I would
up these numbers to 1.5 G side load minimum. Our race cars were
designed to 4.5 G's bump loads.  I forgot what it was for side
loads. They would pull over 2 G's in the corners however.
Aerodynamic download you know!

I've gone one better than that.  I have a full 2-D dynamic landing model in
an excel spreadsheet that takes into account wheel mass, spring rates,
damping rates, spinup, etc.  I know the actual predicted loads for a FAR23
7 ft/s (minimum requirement) hit.  Of course I can vary sink, wind, pitch
attitude at touchdown, etc.  I can even simulate bumps in the runway.
Anyway, with my big wheels the FAR numbers are a joke.  IMO the FAR23
requirement is nothing like conservative for "regular" airplanes either.
That's why I wonder about real world crabbed bounces.  If the airplane was
designed to FAR23 minimums I would expect the wheels to fall off on a good
screwup.

Jeff Spitzer

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