Testing On The Cheap

rattlesnake wrote:
"Brian Whatcott" schrieb im Newsbeitrag
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Well, how about that!
And I thought seat belts were often specified at 29 g's. Silly me!

we talk about seats, not seat belts. How many G's do you think will your
C-150, -172 **seats** be good for?



Well, anonymous poster, you don't need my opinion. And I don't have a
demonstrated load case on those seats.
But take a look at that test case you mentioned: 2 tons on the wings.
Let's say you were demonstrating a 4 g load capability. That would imply
the gross wt is 1000 lbs.
If the engine weighs 220 lb (for a 100 HP) and the two seats can carry
200 lb wetware each - that would amount to 620 lb. Then the airframe
would weigh say 380 lb.

If you were a clueful designer interested in proving a test article, you
might want to ENSURE that a support on the seats, the engine mount and a
the empennage could react the wing proof loads. That would be a smart
thing to do, don't you think?

Do you really, really think an airframe designer hasn't thought it through?
Shouldn't you?

Brian W