RE: 4 strokes
Magnums are great engines but way underpowered, I have a 4 stroke 1.20 which swings a 15 x 6 prop at the same revs as my Saito 1.00 does, I believe smaller magnum engines performs better but always underpowered when comparing with Saitos or OS engines. My magnum will haul a Dynaflite SE5a next year (great idle and acceptable power for this application), I highly recommend this engine for any other scale application, if you are looking for a sport, pattern or 3D application then you should look for a lighter and more powerful engine.