I've flown Stealths dozens of times over the last 10 years or so. I have a bunch of 29mm motors without delays that I can only fly under TRA research rules and a Stealth is the perfect vehicle for them. Always a crowd pleaser with the low and slow flights. I have found that I need to reinforce the bottom of the motor mount though, otherwise it deforms after several launches. But it's a simple fix. I also have made several from non-Priority mail boxes and they work just as well.