There's no .60 on this planet that will rev with
an 11/11 prop. As an example....a Jett .90....
( a bad-ass motor) calls for an 11-8 prop. The
best you could do would probably be an 11-7 1/2
MAS. If the TT .61 is a "torquer"....( under 12 K
RPM's ) a 12-8 Zinger might work.

I don't mean to sound like a "smarty", or spoil
your plans....just tryin' to help. This O.S. .61 RF
is out-pullin' my old FSR on the Super Kaos, and
will not slow down goin' verticle. The MAS props
will out pull the APC's due to wider tips IMHO.
The RF is only turning 11,400 on the ground
( with the pipe ) and pulls like crazy with the 12-8
Zinger.

Just tryin' to help, like I said....try the 11-71/2
MAS, and if anything works better....lemme know.

Good luck...Dave.