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Race Strategy

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cpayne(at)joimail.com
Guest

Posted: Thu Jun 13, 2013 12:37 pm Post subject: Race Strategy

I don't know if anyone on the 'list has done any long distance racing but I am going to give the AirVenture Cup a try this year. All of my race experience has been in short sprints, which fits the CJ's capability better than a 400NM event.



I have a small aux of 14 gallons, which usually is good for an hour at lower cruise settings. The other tanks are stock (41 gallons). New this year is a "Heavy Metal" class for warbirds. The CJ and Yaks are listed as sub-classes. The good news is that new rules allow a "no penalty" gas stop at designated turn points for limited range aircraft like mine. The bad news is that I still have to do a 212.5 NM leg to get to that gas stop.



My strategy is to set prop (M-14P/paddle blade) at 2400rpm, watch the temp gauges and set the throttle to a 24GPH flow. That should yield 160+ knots with my stock 360. That's a lot slower that I used to fly with the old engine, but that one sits in back of the hanger now.



Sooo, is there any benefit to climbing over 3000 AGL over 212 NM while sedately motoring along??



Craig Payne

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hess737(at)aol.com
Guest

Posted: Thu Jun 13, 2013 12:42 pm Post subject: Race Strategy

true airspeed but need to balance that with wind forecast.

 

     Richard Hess

   President

   International Jets, Inc.

   Cell 404-964-4885

 

 

 

   --

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rmhou(at)yahoo.com
Guest

Posted: Thu Jun 13, 2013 1:44 pm Post subject: Race Strategy

Hi Craig,What kind of engine is that "old engine" sitting in the back of your hangar?

Robin

P.S. a friend used to own a CJ with M14B (320hp?) running Chinese prop. He was always faster than other CJ's with 360hp M14P running paddle prop.



--- On Thu, 6/13/13, Cpayne <cpayne(at)joimail.com> wrote:

[quote]

From: Cpayne <cpayne(at)joimail.com>

Subject: Race Strategy

To: "yak-list" <yak-list(at)matronics.com>

Date: Thursday, June 13, 2013, 1:34 PM



--> Yak-List message posted by: Cpayne <[url=/mc/compose?to=cpayne(at)joimail.com]cpayne(at)joimail.com[/url]>



I don't know if anyone on the 'list has done any  long distance racing but I am going to give the AirVenture Cup a try this year. All of my race experience has been in short sprints, which fits the CJ's capability better than a 400NM event.



I have a small aux of 14 gallons, which usually is good for an hour at lower cruise settings. The other tanks are stock (41 gallons). New this year is a "Heavy Metal" class for warbirds. The CJ and Yaks are listed as sub-classes. The good news is that new rules allow a "no penalty" gas stop at designated turn points for limited range aircraft like mine. The bad news is that I still have to do a 212.5 NM leg to get to that gas stop.



My strategy is to set prop (M-14P/paddle blade) at 2400rpm, watch the temp gauges and set the throttle to a 24GPH flow. That should yield 160+ knots with my stock 360. That's a lot slower that I used to fly with the old engine, but that one sits in back of the hanger now.



Sooo, is there any benefit to climbing over  3000 AGL over 212 NM while sedately motoring along??



Craig Payne [quote][b]

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cpayne(at)joimail.com
Guest

Posted: Thu Jun 13, 2013 3:14 pm Post subject: Race Strategy

My "old" (800 hr) engine was leaking oil through the guides. I pulled it off for custom OH when I got the chance last year. It was rebuilt in a Siberian OH facility from a Yak-50 (that's what the Russian logs say). It has polishing and mild porting on the intake and exhaust. Came off the dyno at 372HP. That was before I installed Chinese mags which have centrifugal advance. Throw in auto wiring, electronic ignition on one side, polish the carb and intake plenum, etc, and it turned out to be a powerful runner.



With after-market pistons, rings, valves and the like, it should be solid.



Craig Payne

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