Here are two more .50 sized engines, I received the heads for my Webra .50 and Fox .46 ABC yesterday as posted in another post. The Webra turns the Graupner 12x7 at 9,950, it turned it at 9,570 with its stock muffler and 9,950 when I put the Bisson Pitts muffler you see on it.
The Fox .46 turns the Graupner 12x7 at 8.590.
Webra .50/stock muffler====9,570
Webra .50/Bisson Pitts=====9,950.
Read more:
http://www.rcuniverse.com/forum/m_58...#ixzz0o3KP4Ugn
Here you go.