I would like to re-create one of my planes from back in the day. I had an O.S. .21SE, header, tuned pipe in a 20 sized plane. I had the large fins turned down to about 30%. It was an absolute rocket. I was spinning an 8.5x6.5 prop at 23,500 rpm. Was a really good setup. Was wondering if they had any of the long crank .21 engines around.
If not, looks like I will go with a Rossi 21.
Buzz.