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
Subscribe to:
Post Comments (Atom)
No comments:
Post a Comment