unclecrash

What size prop can the .09 pull.

controlliner

For max efficiency a 7X3 will give you tons of wind and let the engine really wind up.

EX Model Engines

You could run anything from a 6x4 to an 8x4. If you went with the 6x4 Cox you would have to drill out the center a bit to accommodate the prop driveplate.

Regards, Matt.

hllywdb

7 X 3.5 cox grey if you have it, otherwise 7X3 or 7X4. 8X4 is too much lumber and won't let it get up on step.

Tee Bee

The black 7x3.5 is my favorite but they are HARD to find these days. Otherwise I've had decent luck with 7x3 and 7x4s.

icerinkdad

APC has a new 6.5x3.5 prop that looks about perfect for the 09. It is also used by the very high performance 15's used in CL combat.
Bob

Mr Cox

There is a Revup 7x3.5 (at Brodak) with a nice shape and a load that is very close to the cox one.

longdan

Cox grey 7 x 3.5 is the best I've found - from my limited research.
I've tried a couple of APC props, and apart from having to bush the holes, they let it wind up well, but don't produce as much wind as the cox.

fit90

Master Airscrew make a 6.5-3 that might work well.  Although I have not tried it on an .09 Tee Dee I have used it on an .061 MP Jet which is very close in over all performance (at least I think so).  This prop provided both good speed and thrust when used on a 16 ounce Sig Hummer.

Good luck,

Bob

unclecrash

Thanks guys I will have to pick up a couple to try. I have a masterairscrew GF3 series on it just have to give it a whirl.

gcb

Unintended pun?

George

iflyg450

The 6x4 grey prop seems to be good setup in my sig hummer AUW is 15oz. It pulls the plane really well

controlliner

With a 6X4 prop, you must keep a close watch on the piston and rod ball and socket at those RPMS. Other .09's with a wrist pin will handle that prop with less stress