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Chris,
I suspect the rpm drop from 6200 to 6000 is intake heat
saturation. Just a guess. Were is your waste gate spring? After your intercooler
or before it? Glad to see your making progress.
Bobby
I know this must have been discussed, but perhaps more in passing or in
some of Tracy's literature (now kinda dated, especially with
some of the strides he continues to make), but what is the conventional wisdom
as to rotary horsepower? I know when I first started looking into it, oh
many years ago, it seemed the impression I got was that you could pretty easily
achieve 200 hp, however, that is now a bit lower. Some of the tricks to
get the higher HP was mild and medium porting, bridge, "J" and "P"
porting. Then there was the option of turbo...the one, in combination with
a medium street port, I chose.
What say Ye?
When started today, mine was turning about 6200 rpm at 35 MP (with a 3 lb
spring in the wastegate ).....it surged forward against the chocks
and breaks. IVO prop full fine. Nice feel of power even
if it likes to heat up fast in 90 degree weather like this.
Also, I think this was discussed before too, when I
go WOT my engine develops up to about 6250 rpm,
but then drops a couple/few hundred rpm to usually just under 6000....sometimes
just above. Thoughts? Ed, (perhaps Al)it seems you may have chimed
in before. Regrettably , when I search the archives I
tend to get frustrated due to thread drift.
I heard a lot about porting when I was initially investigating all this and
I chose to use a medium street port. I let Mazdatrix do
the work. That being said, I have read all but nothing on others porting
their engines (other than a LOT from PL on P ports). Since standard
porting does not reportedly effect reliability, only, potentially
low low idle (I can idle as low as about 1300 rpm when warm
smoothly) why is it not discussed and/or utilized more?
Just curious guys/gals. Discuss <g>
All the best,
Chris Barber
From: Rotary motors in aircraft [flyrotary@lancaironline.net]
on behalf of Ed Anderson [eanderson@carolina.rr.com]
Sent: Wednesday,
May 26, 2010 5:15 PM
To: Rotary motors in aircraft
Subject:
[FlyRotary] Re: Emailing: 3 view w-10 003, first flight
Always loved the lines
of a Tailwind – in fact, I have the plans and license to build a W-10 sitting on
my book shelf. Unfortunately, I doubt I’ll ever get around to
it.
Ok with thermostat in
the system holding it at 190F – we really won’t know how much reserve capacity
you have in your cooling system until the power goes up.
I agree with George,
200HP out of an N/A 13B is really pushing it. I think 180HP is a more
realistic expectation – but, hey you never know. It amazing how power goes
up when things come together.
Enjoy and fly safe.
From: Rotary
motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of John
Sent: Wednesday, May 26, 2010 2:36
PM
To: Rotary motors in
aircraft
Subject: [FlyRotary]
Emailing: 3 view w-10 003, first flight
My most humble thank you to
flyrotary and all you fine folks that have helped bring my project to
flight. Ed and many others whom I won't try to name here because I would
miss many. The plane is a Wittman Tailwind W-10, empty wt. is 981 and it
is a tri-gear, Wt. is within 6 #'s of similar trikes w/ 0-320
engines. I have the thermostat in the engine because most of the year it
is not very hot, if we get 50 days with the temperature over 70, we have had a
hot summer, not a lot of beach bunny activity. 7-1 I'll be 74 and have
realized my dream, now it's all gravy. Again, thanks guys!!
JohnD
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