RE: Which is better OS .91 or Jett .90 and for that?
well the OS is a good sport engine the Dub Jett is an excellent Performance engine.
while OS claims theirs does 16K ( but with what prop and fuel?)
Dubb Jett states what HIS engine DOES!
I have several Jetts , too many to list again, but the last one is a 50 BSE. I broke it in per instructions and then set the needle for flying (just a tad on the rich side). I did not have to touch the low speed needle it was dead on!
If you want to fly around the patch and save some $$ by the OS.
If you want to kick some serious butt by the Jett.
just my .02
Bob
SIG Kobra Jett SS.40
Magnum Jett sport .50
ACM Whiplash Jett FIRE .50
Great planes F-4 Jett 1.20
nitro planes Bobcat Jett .50 BSE
Waiting for an airframe Jett 60LX FIRE , Jett .30 BSE FIRE, Jett .76