Out of Foam Board!
Now, the Help! prefix is for 2 reasons. 1: I don't know if this would work, and 2: I need help because I may have gone insane... I saw how fast David was able to get his spit going on 4s, so what if I were to take a motor from a 90mm EDF and slap a 7" prop on it and hope for the best? I think that if I were to run this on a FT BF-109 with clipped wings, a modified firewall, and metal gear servos I could get it going much faster than the Spit did. Maybe another 10-15 mph. The motor is an outrunner, and it is rated to 6s on a 90mm 12blade EDF, so I think it might be able to consistently use a 7" prop on 6s without getting too overheated. What do you think?