wrote: OK Tracy,=20 I think 340 HP at 9,000 is an accurate estimate. When do we get the 3.25 or 3.5:1 ratio PSRU? ;-) =09 Bob =09 1600CC. Kind of ends the talk about direct injection. Still looks like a 6 port but the primary ports (the small ones in the center iron) are much bigger. With a combined end port as on Paul Yaws site, and maybe a mild bridge port, I think 340 HP at 9,000 is an accurate estimate.=20 =20 Maybe 250 HP at 6,500. Going to need three blades and 74 inches of prop. =20 Where do I sign up? =20 Lynn E. Hanover=20 ------_=_NextPart_001_01C82AC4.16FC683A Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

What kind of fuel pressure does direct = injection=20 require?

Bobby

From: Rotary motors in aircraft=20 [mailto:flyrotary@lancaironline.net] On Behalf Of Tracy=20 Crook
Sent: Monday, November 19, 2007 9:33 AM
To: = Rotary=20 motors in aircraft
Subject: [FlyRotary] Re: 16X Rotary=20 Engine.

I know you're kidding, (you know how much time it takes to come up = with a=20 new design & put it into production) but here's the other reasons = for not=20 doing a 3.5 : 1 gear drive.

I would agree with the estimate but I don't think = it makes=20 sense in aircraft use. Not that I'm against the HP, it's the BSFC = that=20 bothers me. The rotary gets the best BSFC around 5000 - 5500=20 rpm. Go higher and it gets worse which is OK for short = periods=20 (climb, racing, etc) but if you are going to really spend serious hours = in the=20 air, you want the engine running near the sweet spot of BSFC. With = a fixed=20 pitch prop, this limits us to around 7250 for top end and still cruise = around=20 5400 - 5600 rpm. A CS prop really helps here but that sort of = thing is out=20 of economic reach for most of us. Even if you had the 3.5 : 1 gear = drive,=20 the design of the prop gets really funky. If you ask MT or anyone = else for=20 a prop that works best at 1500 rpm (cruise setting with engine near = 5000) they=20 won't have it.

The 16B plays right into our hands. If we are limited on rpm = (7250 is=20 not TOO limiting : ), there is no substitute for cubic = inches and=20 lower weight. Even with the 7250 limit, that comes out to ~ = 280=20 HP. Not bad for a 150lb (bare block) engine!

Tracy

On Nov 19, 2007 7:00 AM, Bob Tilley <btilley@mchsi.com> wrote:

OK Tracy,=20

I think 340 = HP at 9,000=20 is an accurate estimate.

When do we get the 3.25 or 3.5:1 ratio PSRU? ;-)

Bob

1600CC. Kind of ends the talk about direct injection. Still = looks like=20 a 6 port but the primary ports (the small ones in the center iron) = are much=20 bigger. With a combined end port as on Paul Yaws site, and maybe a = mild=20 bridge port, I think 340 HP at 9,000 is an accurate estimate.

Maybe 250 HP at 6,500. Going to need three blades and 74 inches = of=20 prop.

Where do I sign up?

Lynn E.=20 = Hanover

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