thanks for the input everyone. i think the RCU engine comparing thing has an error, because thats what it says. I am going to look into the irvine 53. I also have been told this model flies exceptionally well with the 61FX. As for the jett, no thanks. if i was going to spend that much i would spring for a YS 4 stroke to put on my funtana and then throw the OS .70 from the funtana onto the nose of the extra. As for being sure whether i want os or not, I have never had a problem with that brand. always reliable and fairly easy to tune in. Lets not start a engine bashing war here though.

sean