ORIGINAL: airraptor
120 AX or YS 115. run a 15x10 on both engines or a 14x12 on the 120AX. For the 115 and the 14x12 stay with 30% fuel or less dont want to run thru the prop.
That's why you should use something like a J-Tec for the exhaust, it my understanding that they can be tuned as well. You get the exhaust stream out a lot further from the prop than a standard exhaust.
Something like this one.
http://www.jtecrc.com/incowlmufflers130-215.htm
And of course you don't have to cowl the motor to use one.
