proptop

My Feedback: (8)

A few of us have decided to get a bunch of those Sonic 500's for some club racing...
We don't have any "spec" engine, so it's run what ya brung in that respect...

I have a NIB K&B .40 "Quickie" FIRE engine w/ the pipe (looks sort of like a straight through Ultra Thrust ) and need some prop / fuel suggestions if you will please...

Do I have to run high nitro fuel? I want it to last for awhile, and I'm not looking to eek out the last little bit from it.
Thanks

luv to race

My Feedback: (1)

9 x 7 ... 9 x 8 .... 15% Fuel.

rb

proptop

My Feedback: (8)

Thanks, but are those props gonna be safe at the r.p.m. this engine's gonna turn 'em?

I was looking at the APC 40 pylon props, but I'm wondering which ones I should order?

I have a few in mind, but don't want to end up with a bunch of props I can't use, ya know?

luv to race

My Feedback: (1)

You might want to contact Fred at the APC shop... But I want to say, that you'd be safe up to 25K... but verify that first.

RB

garys

Actually that engine won't be able to turn a 9x8. We used to use those engines on the west coast prior to the Nelson's coming out. We used full tuned pipes, and proped them for 19-20k on the ground with modified Rev-Up Pro Series (the wide-blade props, not the pylon props) 9x6.5's, sometimes 9x7's, on 15% fuel. Not sure how to prop it for the magic muffler that it sounds like you have, but I'd shoot for the same rpm's.