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

Date: 04/01/06 23:= 22:24

Subject: [FlyRotar= y] Longer props [ was Re: [FlyRotary] Re: Very short intake manifold leng= th

Georges, I don't have my= RX-8 engine mounted and don't have a prop - I do have the RD-1C 2.85 to = 1 PSRU. I'm planning on an 80 inch prop for my RV-6. Figure I= 'll have 10" ground clearance with tail up. (not sure of that, yet)

I'll insert a pdf versio= n of my spreadsheet that gives prop tip speed and mach number, with Mazda= 's "revised down" hp numbers in a column I added tonight. I'll be u= sing the lower power version of the Renesis engine 192hp max at 7000rpm (= 7500 rpm max limit). The chart also has the "higher hp engine" numb= ers (231hp at 8200, with engine limit of 9000rpm)

. . . Inserting the pdf = didn't work. Will attach to this e-mail - hope it works

David Carter

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

<= B>From: Echo Lake Fishing Resort (Georges Boucher)

To: Rotary motors in air= craft

Sent: Saturday, April 01, 2006 8:4= 1 AM

Subject: [FlyRotary] Re: Very shor= t intake manifold length

Thanks Lynn

<snip> Sure would like to hear from anyone using a large prop = on a 13b. <snip> <= /FONT>

Georges Boucher

2126 Creighton Valley Road

Lumby, British Columbia

Canada V0E 2G1

Phone:(250) 547-6434

1- 877-547-6434

Fax:: (250) 547-2342

www.echolakefishin= gresort.com

echolakeresort@xplorn= et.com

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

From: Lehanover@aol.com

Date: 04/01/06 01:= 16:36

To: Rotary motors in aircraft

Subject: [FlyRotar= y] Re: Very short intake manifold length

In a message dated 3/31/2006 9:54:37 P.M. Eastern Standard Time, ech= olakeresort@telus.net writes:

Thanks Lynn

I would like to get 200hp at 7500RPM, With a gross weight of 2300lbs= on floats & a cruise speed of about 120mph it's not like an RV.= My plan is a plugs up position with a 3 stage Weaver dry sump pump and a= 14 quart oil tank. I have a 90 13b NA (9.7:1 rotors) Mazdatrix street po= rt template, 3GM evaporator cores in series & RX7 oil cooler (2 if ne= eded), RWS 2.85:1 re-drive, EM2 & EC2 with an IVO 84" controllab= le propeller. Is 200HP a pipe dream?

Georges B.

It is possible that you could get very close to 200 H= P with a street port. The last conversations I had with the two great eng= ine builders I know was that the E production engines (13B treet ported t= wo 38MM chokes) were producing 229HP and 231 HP, but at close to 9,000. I= n reading about Dave Lemons engines (also E production) he said he could = not get used to shifting after the 10,000 RPM light comes on. These are i= n very fast cars, and in most cases faster than mine (GT-3 12As). G= oogle Dave Lemon. These are running a limited (by rules) street port.

Turning that big a prop 2,631 RPM even with no pitch = is perhaps hopefull.

The airboat people tend to very low pitch large diame= ter props with wide blades. They also use 550 cubic inch 350 HP engines. = The latest gag is two props counter rotating at differing RPM. That = so they can load the boat and leave from the dry grass into the water and= not need a loading ramp. Check with Ken Weller on that float plane stuff= =2E He uses a 100 HP nitrous shot (available at any hot rod shop) to expl= ode out of the water. He has the extra fuel required figured out and shut= s off the trailing ignition during the shot to prevent detonation. Rememb= er the definition of detonation? Very clever.

If you were looking for 190 HP with a 50HP nitrous sh= ot on top of that to pop up I would say no problem. I have no feel for th= e drag of floats vice a displacement hull. Sounds like it would be l= ess.

I am down to 6 quarts in the small holding tank. Tall= and small diameter. It was a new fire extinguisher bottle. Clean and lig= ht. If you don't already own it, I would skip the weaver brothers pump. I= have one. It is a gear and idler type and cannot pull much of a vacuum a= nd unless new inside cannot produce top pressure. It just has very little= displacement. A gearotor (ring and rotor) type is what I use now. The ol= d round style Peterson is fine. the newer square bodied Peterson is junk.= The pressure section splits open along the bolt holes. Only a college gr= aduate would build a square pressure vessel. My current pump is the = Moroso with the Ford pressure section (bigger rotors) 1 1/8" instead of 7= /8" (I think). Peterson does have a selection of Gilmer belt pulleys at a= good price. The belts are cheap through any power transmission store. A = friend just paid me another Moroso pump that I built for a Datsun years b= ack for building him a rotary he had damaged. So now I have a spare Moros= o pump.

Unless there is a real clearance problem, I would avo= id the plugs up thing. It adds several engineering problems to a very bus= y program. You can move the filter to a remote location with no problem. = Planes with that layout tend to land on roads more than others.

Lynn E. Hanover

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