stunthanger.com

Speed,Combat,Scale,Racing => Carrier => Topic started by: roger on July 10, 2009, 01:52:54 PM

Title: props
Post by: roger on July 10, 2009, 01:52:54 PM

what is a good prop size for a .15 motor and what about wood props? im running a os. .15 motor. and what about the grey props the ones that look old timey?

Title: Re: props
Post by: john e. holliday on July 11, 2009, 09:23:22 AM

Start with 7-6.  Then try an 8-5 or 4.  A lot depends on the airplane design also.  DOC Holliday

Title: Re: props
Post by: roger on July 11, 2009, 09:49:10 AM

thank you H^^

Title: Re: props
Post by: Paul Smith on July 11, 2009, 01:31:20 PM

I would rule out wood, since you want flywheel action to keep the engine running.  Heavy is good, at least for the prop.

You need a size prop that lets the engine get to it's rated HP RPM.   With a 70 MPH speed limit, you don't need a lot of pitch.

Title: Re: props
Post by: bfrog on July 11, 2009, 06:55:19 PM

In 15 carrier I use an APC 7X4 on my Cox Conqest engine. I have tried other sizes and that seems to work the best. The Cox spins up really well so I can't say this prop is the best for other engines but it works for me.