RE: 3d plane for 91 4stroke
hi Murdoc
i have a Weston Hype 3D with Surpass 90 up front.
it does all 3D stuff very well except snap rolls which are a bit stodgy.
it will do climbing flat spins upright or inverted
it K/Es with little coupling and K/E loops with ease, you could do a lot worse
regards piroflip