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Speed,Combat,Scale,Racing => Speed Talk => Topic started by: bob whitney on November 13, 2018, 12:36:14 PM

Title: Cox Reed valve engine
Post by: bob whitney on November 13, 2018, 12:36:14 PM

what is a good RPM target for a Cox reed valve engine on 10% nitro

Title: Re: Cox Reed valve engine
Post by: Dick Tyndall on November 13, 2018, 01:35:29 PM

   My guess would be around 12,000 RPM. Somewhere around that number. When we were Mouse Racing with the reed valve engines we were turning around 18,500 RPM. That was about the limit of nylon props before the blades started stretching at the hub. Not good........


                          Dick Tyndall

Title: Re: Cox Reed valve engine
Post by: bill bischoff on November 13, 2018, 02:23:35 PM

Ask Paul Gibeault or John McCollum. Of course the first question is "what prop?"

Title: Re: Cox Reed valve engine
Post by: Paul Smith on November 13, 2018, 02:26:11 PM

Quote from: bob whitney on November 13, 2018, 12:36:14 PM

what is a good RPM target for a Cox reed valve engine on 10% nitro

Any RPM you get on 10% would be a miracle.  25% is the entry level for Cox 1/2A's.

Title: Re: Cox Reed valve engine
Post by: john e. holliday on November 14, 2018, 11:20:16 AM

I've lost count of the years that I flew the Cox .049's on the same 10% fuel I flew my stunt/combat/racing/navy carrier planes on. D>K

Title: Re: Cox Reed valve engine
Post by: Jim Carter on November 14, 2018, 03:58:53 PM

Quote from: john e. holliday on November 14, 2018, 11:20:16 AM

I've lost count of the years that I flew the Cox .049's on the same 10% fuel I flew my stunt/combat/racing/navy carrier planes on. D>K

 ;D ;D Ditto!!  ;D ;D