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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 port template, 3GM evaporator
cores in series & RX7 oil cooler (2 if needed), RWS
2.85:1 re-drive, EM2 & EC2 with an IVO 84" controllable
propeller. Is 200HP a pipe dream?
Georges B.
It is possible that you could get very close to
200 HP with a street port. The last conversations I had with the
two great engine builders I know was that the E production engines
(13B treet ported two 38MM chokes) were producing 229HP and 231
HP, but at close to 9,000. In 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 in very fast cars,
and in most cases faster than mine (GT-3 12As). Google 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
diameter 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. He uses a 100 HP
nitrous shot (available at any hot rod shop) to explode out of the
water. He has the extra fuel required figured out and shuts off
the trailing ignition during the shot to prevent detonation.
Remember the definition of detonation? Very
clever.
If you were looking for 190 HP with a 50HP
nitrous shot on top of that to pop up I would say no problem. I
have no feel for the drag of floats vice a displacement
hull. Sounds like it would be less.
I am down to 6 quarts in the small holding tank.
Tall and small diameter. It was a new fire extinguisher bottle.
Clean and light. 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 and 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 old round style
Peterson is fine. the newer square bodied Peterson is junk. The
pressure section splits open along the bolt holes. Only a college
graduate 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 back for
building him a rotary he had damaged. So now I have a spare Moroso
pump.
Unless there is a real clearance problem, I
would avoid the plugs up thing. It adds several engineering
problems to a very busy 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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