Originally Posted by
aspeed
A Rossi or Novarossi will put out 1/2 hp better than a .40 GP Thunder Tiger too. The weight is often overrated. It is the plane power to weight ratio that makes the difference. A motor that revs to 30,000 or 40,000 rpm needs to be stronger. Some old Nelsons had the cylinder fly completely off. Plain bearing engines are fine. Look at the Small Block Chevy.
I remember my LA25 running incredibly high revs for being a bushing motor, I had it installed on a global hobbys Aeroprincess .15, that was my first glow powered plane, it eventually crumpled up in the air while doing a high speed pass with the LA screaming, I ran a APC 9x6 prop and it was quick.