stunthanger.com

Building Tips and technical articles. => 1/2 A building. => Topic started by: bob whitney on November 13, 2018, 12:34:00 PM

Title: cox reed
Post by: bob whitney on November 13, 2018, 12:34:00 PM

owhat is a good RPM target for a cox Reedy on 10% nitro

Title: Re: cox reed
Post by: Steve Berry on November 13, 2018, 12:53:29 PM

Depends on which one it is.

Baby Bee might get to 13,000.
Black Widow can get to around 17,000.
The Venom & Killer Bee can get upwards of 20,000.

It mostly depends on reed material & age/wear, cylinder (porting & such), glow head (high compression vs regular), head gaskets, temperature of the air, humidity, phase of the moon, and whether or not you've saved 15% by switching to GEICO.

Sorry it's not more specific. I'm going to guess you're talking more about a Baby Bee or product engine, where the top end may be around 12,500 or 13,000. Larry should be able to give a better answer.

Title: Re: cox reed
Post by: Dave Hull on November 13, 2018, 05:50:47 PM

interesting question. I can't remember trying one (on purpose) on 10% fuel.  Unless maybe it was a Mouse II?  You might want to play with the head shims a bit to get back what you are giving away. I suspect it will be touchy.  Are you doing this to pick up some mileage on a stunt setup?

Divot McSlow

Title: Re: cox reed
Post by: bob whitney on November 13, 2018, 06:18:35 PM

just getting some break in time on it

Title: Re: cox reed
Post by: Dave Hull on November 13, 2018, 09:45:49 PM

Gotcha. But if you just up the nitro later, it may still be tight.

Dave

Title: Re: cox reed
Post by: Larry Renger on November 14, 2018, 07:36:47 AM

What prop are you using?