Cambo,
Yes, that IS a LiteMachines engine. I did an article in Flying Models in August of 2001 on using the LM engines with custom made, exhaust throttles. Lots of R&D showed that LM got it exactly right. BUT, the throttling MUST be done behind the muffler and not ahead of it.
See this for more infromation,
http://www.rcuniverse.com/forum/m_25...tm.htm#2544245
The Norvel engines CAN throttle perfectly and give excellent power. They just need to be Big Migs (same as LM) and must have an adjustable airbleed added to the OLD style, intake throttles. The new style CAN be made to work but it's hit and miss.
The prop I use on most of my 1/2As are the Grish, black Tornado props, 6 X 3. APCs in this size are a bit light and Cox's work well too but they do load the engine more and in some planes, this not good. The Grish are between the APC and the Cox so they do a good job for the average application.