I know this must have been discussed, but perhaps more in passing or i= n some of Tracy's literature (now kinda dated, especiall= y with some of the strides he continues to make), but what is the conventio= nal 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, howev= er, 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 o= f 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 th= e 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 abov= e. Thoughts? Ed, (perhaps Al)it seems you may have chimed in before. Regrettably, when I search the&nbs= p;archives I tend to get frustrated due to thread drift.

I heard a lot about porting when I was initially investigating all thi= s 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 effe= ct reliability, only, potentially low low idle (I can id= le 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

Houston, GSOT

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 th= e lines of a Tailwind =96 in fact, I have the plans and license to build a = W-10 sitting on my book shelf. Unfortunately, I doubt I=92ll ever get around to it.

&= nbsp;

Ok with thermos= tat in the system holding it at 190F =96 we really won=92t know how much re= serve capacity you have in your cooling system until the power goes up.

&= nbsp;

I agree with Ge= orge, 200HP out of an N/A 13B is really pushing it. I think 180HP is = a more realistic expectation =96 but, hey you never know. It amazing how power goes up when things come together.=

&= nbsp;

Enjoy and fly s= afe.

Ed Anderson

Rv-6A N494BW Rotary Pow= ered

Matthews, NC

eanderson@carolina.rr.c= om

http://www.andersonee.com=

http://www.dmack.net/maz= da/index.html

http://www.flyrotary.com/

http://memb= ers.cox.net/rogersda/rotary/configs.htm#N494BW

http://www.rotaryaviation.co= m/Rotorhead%20Truth.htm

From:= Rotary motors in aircraft [mailto:flyrotary@lancaironline.n= et] On Behalf Of John
Sent: Wednesday, May 26, 20= 10 2:36 PM
To: Rotary motors in aircra= ft
Subject: [FlyRotary] Emaili= ng: 3 view w-10 003, first flight

My most humble thank you to flyrotary and a= ll you fine folks that have helped bring my project to flight.&nb= sp; 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. i= s 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 th= e 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 bunn= y activity. 7-1 I'll be 74 and have realized my dream, now it's all g= ravy. Again, thanks guys!! JohnD

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