Mark Smith wrote:

UltraJohn wrote:

Mark Smith wrote:

exactly what stresses increase due to adding the outer sleeve of steel,
assuming your 'steel' adds no weight or inertia to the problem,,,,,,,


For starters all your flexing is now done on the end instead of gradually
over the length of the pipe. IE willow verses oak!
John


does the reduced flexing with the sleeve increase or reduce the stresses
at the wing root ?

It definitely increases the stress.
Without the pipe the length of pvc absorbs energy along it's length with the
pipe over it all the stress is reflected at the end.
John

Look at the wing of an airliner the next time you fly and you'd be amazed at
how much it flexes. If they stiffened it to the point it didn't flex you'd
end up on the ground do a pretty quick vertical decent. Not Good!