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Thinking about load testing one main gear assembly off the plane project
anticipated for 1000 # gross and have two question areas.
FIRST: FAR 23.725 provides a drop height range from 9.2 " to 18.7". With a
1000# gross plane, I think this calculates as 797 and 882# respectively on
each main..........Correct??
IE: I was going to apply 797# minus the actual gear weight at 9.2" height.
Ground Load Dynamic tests in 23.726(a)(1) also requires a test at 2.25 x
height in above 23.725. This raises the drop heights to 20.7" and 42" with
weights at 892# and 942# if calc'ed correctly.
In a previous project a long while ago, I merely used a 3G load divided by
mains to size the structural members. Then with the aforementioned 1000#
gross, it would have be 1500# on each gear. My rational for the 3G was
23.561(b)(2) for emergency landing upward conditions on a normal category
airplane structure.
SECOND: What setup could be used to do such a load test??
Is it mandatory to actual freefall drop or somehow just apply the load??
Maybe along the lines of a built up 2x4 beam lever approach.......Any
suggestions?? Am I thoroughly confused <G>?
Thanks, Dick
ps Although RAH has been very helpful in the past, if there is a better
website for this kind of discussion, I'd appreciate knowing it.
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Need Help on Landing Gear Calculations
