The test-wings are too expensive, and unnecessarily heavy, to be suitable for production. We expect to crash a few prototypes! So our plan is to make carbon-fibre moulded copies of the test-wings. I have made a mould for the port wing (unsealed below), and it has held a vacuum gauge steady for 54 hours now: I think the seal is excellent. So far so good, but an awful lot of work remains to test convenience of a moulding cycle. And first, I need to reinforce to mould to withstand the pressure when empty. I ran this test with the wing plug inside to support it against the air-pressure load.
See the vacuum test at https://www.instagram.com/p/Crh2p7VMjc0/
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