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Dwayne,
Ah the penny drops, I was hoping you would consider
that. Our own Bill Jepson (mechanical engineer) has teamed-up with
the surviving partner of the Powersport owners. Powersport didn't
invent the process but they did apply it to Mazda rotary end housings and it was
very successful, with the death of one of the partners the business closed down.
They are in the process of getting things up and running again.
For many years there has been attempts to develop
aluminium end housings with varied success. The carbon steel housings are about
1lb heavier but have none of the disadvantages of the aluminium. They are
perfect for what you need IMHO.
Bill I assume will be watching this
space.
I don't know if there are any 3 rotor cranks made
in the States but there is a company in New Zealand who does.
This I think will be your best and cheapest
solution for your power requirements. Will probably get about 360 hp with PP -
remember the light carbon steel housings are made for PP only. I was pleased to
see Tracy getting 270hp at lower RPM, if the power is too much you might
consider a lower 2.17 reduction drive - prop turns anti-clockwise with the
2.17.
George ( down under)
Lightweight carbon steel housings? Where exactly do I find
those?
From: George Lendich <lendich@aanet.com.au>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Mon, August 2, 2010 7:14:41
PM
Subject: [FlyRotary] Re:
Bad rotary week
Dwayne,
Just some thoughts, please don't consider me an
expert.
I believe you have a couple of options, a 20B
should give you approx 270hp ( or 90 hp x 3 rotors) in basic configuration,
some of the 20B builders can confirm this or otherwise. Parts should be not
that hard to get once the housings development is complete. You can get
the 3 rotor crank in a number of outlets.
You should be able to build a 20B with the light
carbon steel housings replacing the heavy cast steel housings, for about the
same weight as a 13B. That would be nice.
The light carbon steel housings are designed
for PP, that could give you as much as 360hp in a 20B, if you design for
optimum HP or less using lower compression rotors.
A 2 rotor 13B -PP might get you 250hp then again
might not however I feel it would give you the 230
hp. A 2 rotor PP with NOS would get you the take-off power required.
I believe that currently being done by someone.
Then there's the Turbo, which you know
about.
Just remember to consider all
options.
George ( down under)
Bobby / Tracy -
Do
either of you know what HP your Renesis is generating? I'm very
curious about the supercharged Renesis. If you know the installed
weight that would be great info too?
George - I'm
building a Bearhawk on floats and would like 250+ HP.
Anyone who cares
- I currently fly a Stinson 108-1 behind a Franklin 150 so I'm painfully
aware of how hard it is to come by parts for unique engines. That
makes the 20B much less appealing as an option for me. That being
said, I watched from the Sea Plane Base at Oshkosh as an Aeronca Sedan with
145 HP lumbered across Lake Winnebago trying to get off the water.
People actually cheered when he finally broke a float free. I
think he was in Appleton's airspace by the time he got into air (no, I'm not
kidding either). That type of performance just won't cut it so
anything less than 230 HP is not an option for me either.
Thanks very
much.
Dwayne
From: Bobby J. Hughes
<bhughes@qnsi.net>
To: Rotary motors in aircraft
<flyrotary@lancaironline.net>
Sent: Mon, August 2, 2010 6:33:36
PM
Subject: [FlyRotary] Re:
Bad rotary week
Dwayne,
My super charged renesis uses 1 oz per gallon of 2
stroke oil. So it's very likely David is using 1 quart every 5 hours.
Question is 2-stroke or sump? No indication I am using any sump oil. But I
only have about 35 flight hours. I do have a small internal coolant leak
and need to replace an o-ring when my fiberglass work is finished. I
would choose the renesis side port exhaust over a peripheral port exhaust
any day for our application.
Bobby Hughes
For anyone
hoping that a 16X would show up any time soon: not ... gonna ...
happen. No RX7 and the RX8 is still powered by the Renesis for
2011.
As if that's not
bad enough, when I was at Oshkosh I took in David Atkins rotary seminar.
I came away pretty depressed thinking that I probably won't put a
rotary engine in my airplane. Is everyone else really using 1 quart of
oil every 5 hours? He also didn't have much good to say about the
Renesis in an aviation application which leads me to conclude that the 16X
will fare even worse in aviation applications as it is tweaked to meet
higher EPA requirements and produce more low end torque.
Is anyone but
Tracy using a Renesis? I'd really like to know what HP you're getting,
what the fuel burn is and how it's holding up.
Thanks,
Dwayne
P.S. I
couldn't find any rotary planes on the field at Oshkosh. Perhaps they
sank into the mud.
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