I run my two engines head to head. Both were turning APC 11x6 props. Neither was really peaked out completely. Both turned over 11,000 RPM and idled well.
Please check out my Blog pages
http://www.rcgroups.com/forums/member.php?u=89119
http://www.dmrcflyr2.com/#!blog/k40vr
And my website
http://www.dmrcflyr2.com/
