Iterating through outside aerospace suppliers is close to impossible, which is why a hardware startup should own its own machine shop.

one of the most important things we discovered along the way is it's extremely difficult to iterate with outside suppliers, particularly outside suppliers in aerospace, which are let's just say I have no kind words for them. So we chose to build our own machine shop. And now we can go from a digitally designed engine part to a prototype part in about 24 hours.