Various forums online are for or against a load test.  It 
is my understanding that every single home-built aircraft in Europe must
 pass a load test prior to getting approval to fly, and those airplanes 
aren't crashing because of the test.  And a well-managed test to a load 
condition within the expected operating range should do no more harm 
than flying normally.  I'd MUCH rather something break or deform on the 
ground where I have a chance of catching and correcting the error, 
versus in-flight.  Practically, there are enough Goats flying (ten?) to 
give some reasonable confidence in the structural design.  But, and I 
have to keep telling myself this, it's such inexpensive insurance.
For
 the positive load test, I will be using some heavy-duty sling straps 
looped around the nose top tube structure where the seat attaches, 
simulating my body mass being the load.  These straps will be set up to 
hold the assembled nose and wing sections at a slight angle to simulate 
an angle of attack.  And then a series of jugs of water will be split 
along the leading and trailing edge spar tubes and hung using string or 
maybe bent coat-hangers.  Hanging weights will get more definition after
 building the hanging rig.
Available to me (four hours 
away) is an old wooden swing set with plenty of structural margin to 
hold the mass and plenty of height too.  It's a lot of work to haul Goat
 that far, and back again.  Or, it's a lot of work to build a big and 
temporary test rig in the backyard.  I'm torn.  It'll probably be easier
 to build a copy of the swing set gantry in the back yard here.  Maybe I
 can give it to a colleague with a youngster afterwards...
Sunday, April 16, 2017
Thoughts about load testing
Posted by
burnt
at
7:12 PM
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