wrote: I assume you are talking about a 6000 rpm limited rotary vs a wide = open=20 0-360. Run the rotary faster and thats the end of the story. Jerry Ed Anderson wrote: > Tom,=20 > I don't really think anyone can accurately make a generalization = like=20 > that. =20 > From: Tom > It's my understanding that NA non-renesis rotary installations=20 > 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 =3D velocity * carb area. > > If the velocities are higher, the rotary consumes more air, and = makes=20 > more power. > -------------------------------------------------------------------------= ----- Do you Yahoo!? Yahoo! Search presents - Jib Jab's 'Second Term' ------=_NextPart_000_0062_01C50F63.19A21A00 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Actually, Tom

The answer to your question is = yes! Even I=20 have achieved 6800 rpm in level flight - but, you need to ask with what = gear box=20 ratio and what prop. The 6800 rpm was with the 2.85:1 gear ratio = and a=20 76x88 prop. Put on a low pitched short diameter prop and you = can=20 easily achieve 6000 rpm even with a 2.17:1 gear box. My top rpm = with that=20 set up was 6300 rpm and Tracy Crook got much higher - I think he = achieved=20 7200 rpm.

Yes, all in level flight, gravity = assist does not=20 count {:>)

Now, if your induction/exhaust is not = correct or if=20 your Fuel MAP for your EFI is not set up right and ignition timing is = not=20 optimum, Or if you have a very draggy airframe which precludes unloading = the=20 prop and engine as you pick up airspeed, then certainly you can produce = a lot=20 less power. But, that's true of aircraft engines or = rotaries.

----- Original Message -----

From:=20 Tom

To: Rotary motors in = aircraft

Sent: Thursday, February 10, = 2005 10:52=20 AM

Subject: [FlyRotary] Re: : 13b = vs 360=20 performance

Ed / Jerry,

I stand corrected. Let me say that 'the 13b power I see = being=20 achieved so far in NA 13b airplane installations seem to be less than = what=20 O-360 guys are getting'. After mounting props = was=20 anybody able to attain even 6000 rpm in their 13b NA aircraft = installation,=20 level-flight?

Tom

Jerry Hey <jerryhey@earthlink.net>= =20 wrote:

I assume you are talking about a 6000 rpm limited rotary vs a = wide open=20
0-360. Run the rotary faster and thats the end of the story.=20 Jerry

Ed Anderson wrote:
> Tom,
> I = don't=20 really think anyone can accurately make a generalization = like=20
> that.

> From: Tom
> It's my understanding that NA non-renesis = rotary=20 installations
> produce less power than 360s, Perry Mick = might=20 have a word on this.

> Eric Ruttan wrote:
> A = 360 Lyc=20 does not produce the same power as a rotary.
> If true, then the = Ellison=20 card may not get enough air.
> If not true, then there is no = real reason=20 why the Ellison cannot feed a
> rotary.
>
> Ed, I = understand=20 your math, but even if the local inlet velocity is much
> = higher, we=20 dont care. the velocities adverage out to the same, as the
> = volume of=20 air =3D velocity * carb area.
>
> If the velocities are = higher, the=20 rotary consumes more air, and makes
>=20 more power.
>

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