The Coot is a whole different bird than most of you are flying but for comparisons I have flown with another Coot with an IO-360 and I can blow him away on takeoff out of the water but I am cheating as I kick an extra 100 hp with the nitrous to lift it out of the water, on climb out he will blow me away as my prop is fixed for cruise and he has a CS prop, in cruise we are a dead match when I am running at 6500 rpm < gear ratio is a 2.95 to 1 >.

  Ken

Ed / Jerry,

I stand corrected.  Let me say that 'the 13b power I see being achieved so far in NA 13b airplane installations seem to be less than what O-360 guys are getting'.    After mounting props was anybody able to attain even 6000 rpm in their 13b NA aircraft installation, level-flight?

 

Tom 

Jerry Hey <jerryhey@earthlink.net> wrote:

I assume you are talking about a 6000 rpm limited rotary vs a wide open
0-360. Run the rotary faster and thats the end of the story. Jerry

 Ed Anderson wrote:
> Tom, 
> I don't really think anyone can accurately make a generalization like
> that.

 

> From: Tom
> It's my understanding that NA non-renesis rotary installations
> produce less power than 360s, Perry Mick might have a word on this.

 

> Eric Ruttan wrote:
> A 360 Lyc does not produce the same power as a rotary.
> If true, then the Ellison card may not get enough air.
> If not true, then there is no real reason why the Ellison cannot feed a
> rotary.
>
> Ed, I understand your math, but even if the local inlet velocity is much
> higher, we dont care. the velocities adverage out to the same, as the
> volume of air = velocity * carb area.
>
> If the velocities are higher, the rotary consumes more air, and makes
> more power.
>

               

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