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Thrust - Over Rated-Overstated?

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roncarolnikko(at)hotmail.
Guest

Posted: Thu May 11, 2006 10:31 am Post subject: Thrust - Over Rated-Overstated?

The slip or cavitation is something that surprised me as I tried to find the 

best pitch for my Avid Flyer.  That engine is a 582 with 2.58:1 gears and a 

68" GSC.  I don't recall the exact numbers, but I believe my overpitched 

static rpm was 5800 regardless of 15 degrees setting or 17 degrees.  The 

funny part was that with 17 degrees pitch it pulled my rpms down to around 

4200 as my airspeed climbed.  15 degrees must have been the edge of the 

static stall as the rpm's increased with airspeed from that setting.  Sorry 

if my describing the pitch in degrees is confusing.  GSC uses a protractor 

which relates to the actual pitch.   You guys are way over my head on most 

of this, but I'm trying to keep up.  Ron NB Ore

PS:  Short post due to exccess time on hand.



 	  Quote: 	
		  From: kurt schrader <smokey_bear_40220(at)yahoo.com>

Reply-To: kitfox-list(at)matronics.com

To: kitfox-list(at)matronics.com

Subject: RE: Re: Thrust - Over Rated

Date: Wed, 10 May 2006 22:12:29 -0700 (PDT)




<smokey_bear_40220(at)yahoo.com>



You guys are too fast for me to get back to you...

Simple becomes complex, or is it just me lately?  You

are right.  I don't have time to shorten this!




	


 	  Quote: 	
		  



Those little racers that are trying to get as much as

possible out of the same size little engine use props

that are way over-pitched for takeoff.  I was told

they were stalled at the beginning of the roll, but

now I don't know.  Isn't someone here a racer who can

tell us?  Maybe they are still light enough to get

going stalled then the prop grabs when it unstalls on

the roll.

Whew....



Kurt S.



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smokey_bear_40220(at)yaho
Guest

Posted: Thu May 11, 2006 9:03 pm Post subject: Thrust - Over Rated-Overstated?

Ron,



Great to have you jump in and yes that is good info

you give.  You made it practical, not just

theoritical.  "Cavitation" = good word.  Like a

spinning tire, when it grabs, RPM drops, but plane

accellerates.



Kurt S.



PS:  It is storming out - lots of time.  



--- ron schick <roncarolnikko(at)hotmail.com> wrote:



 	  Quote: 	
		   The slip or cavitation is something that surprised

 me as I tried to find the 

 best pitch for my Avid Flyer.  That engine is a 582

 with 2.58:1 gears and a 

 68" GSC.  I don't recall the exact numbers, but I

 believe my overpitched 

 static rpm was 5800 regardless of 15 degrees setting

 or 17 degrees.  The 

 funny part was that with 17 degrees pitch it pulled

 my rpms down to around 

 4200 as my airspeed climbed.  15 degrees must have

 been the edge of the 

 static stall as the rpm's increased with airspeed

 from that setting.  Sorry 

 if my describing the pitch in degrees is confusing. 

 GSC uses a protractor 

 which relates to the actual pitch.   You guys are

 way over my head on most 

 of this, but I'm trying to keep up.  Ron NB Ore

 PS:  Short post due to exccess time on hand.


	


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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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