Air Brake Minimum Diameter--- Unintentional Helicopter

Okay, wasn't SUPPOSED to spin.

This is a minimum diameter tubeless design, again the engine gets released at apogee when the brakes deploy.
I was happy with the shorter length of the brakes on this one, especially given the narrow width, if I can go shorter they are less likely to "break" (rather than "brake"..... sorry, couldn't resist.)

If you are wondering about the writing on the fins, as I am building as I come up with new ideas I just write them on the rocket..

[video=youtube;a_1U-WHzcFI]https://www.youtube.com/watch?v=a_1U-WHzcFI&feature=youtu.be[/video]

For some reason my dog (who almost NEVER EVER barks) goes crazy when I go into the count down sequence. Couple of times she jumped right out the window of the car.

Really cool designs. if you don't want it to spin, you could attach the fins at 90-deg to the side walls.