Originally Posted by skypup
You're welcome. I use to like os engines also. I have been flying mostly helicopters and electric planes since 1998. From 1964 to 1998 I of course used nitro engines. The Spacewalker II called for a four stroke like you suggest. I had a saito fg-14 but sold it before I really put it to the test. Another motor I was interested in is the Roto Motor 35 FS. Appears to be well made and would be great for scale.
I have seen the ROTO, it looks very nice. I would be (perhaps wrongly) concerned myself about spending so much on an engine that doesn't have a large presence in the U.S. at this time. That always concerned me about the beautiful Laser engines, although Proctor has been carrying them for a long time. I haven't checked lately, but I never hear much about Enya or Irvine engines anymore. Saito and OS are safe bets and well established with major distributors.
I love electrics for the smaller planes, but I still have a soft spot for IC engines on the larger models.