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Actually, Tom
The answer to your question is yes! Even I
have achieved 6800 rpm in level flight - but, you need to ask with what gear box
ratio and what prop. The 6800 rpm was with the 2.85:1 gear ratio and a
76x88 prop. Put on a low pitched short diameter prop and you can
easily achieve 6000 rpm even with a 2.17:1 gear box. My top rpm with that
set up was 6300 rpm and Tracy Crook got much higher - I think he achieved
7200 rpm.
Yes, all in level flight, gravity assist does not
count {:>)
Now, if your induction/exhaust is not correct or if
your Fuel MAP for your EFI is not set up right and ignition timing is not
optimum, Or if you have a very draggy airframe which precludes unloading the
prop and engine as you pick up airspeed, then certainly you can produce a lot
less power. But, that's true of aircraft engines or rotaries.
Ed
----- Original Message -----
Sent: Thursday, February 10, 2005 10:52
AM
Subject: [FlyRotary] Re: : 13b vs 360
performance
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?
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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