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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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3 view w-10 003
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