what is a good prop for st3000  
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> what is a good prop for st3000
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what is a good prop for st3000 - 3/24/2002 10:15:57 AM   
racer rob-RCU


 

Posts: 68
Joined: 12/27/2001
From: BAKERSFIELD, CA, USA
Status: offline 		can any one give me a prop size for a super tiger 3000 would be. right now i have an 18x8 on it and it is turning 8400rpm. I havent got to fly the plane it is in.so i dont know if this is good or not I dont have any info on this motor so any help would be much appreciated. Thanks Rob
       Post #: 1

Good Engine - 3/24/2002 9:37:54 PM   
Otto Kudrna



Posts: 373
Joined: 2/19/2002
From: Burr Ridge, IL, USA
Status: offline 		Hi Rob

I have always liked the large STs, I find that these engines are timed and carburated for heavy lugging. I always prop my engines to turn between 7500 and 8000 RPM and detirmine the pich or diametter depending on the airplane. If it is a low drag airframe I go with less Diametter and more pitch. If it is a hi hragg airframe I go with more Diametter and less pitch. You must remember that the stock carburator as good as it is (and it is good) will only allow relativly low rpm and still provide efficiency.
If you want more revs you would have to change to a OS or a K&B Carb. I have run the K&B carb and it will allow the engine to rev quite a bit more, which is fine if raceing is your thing. I personaly leave the engines alone and run large props. I also have found that these engines, and that means all of the large STs from .75 and up, love 15% nitro car fuel (12% oil) and a cold glow plug. I personally prefere the Rossy 6 or 7. I use the coldest plug possible which still allows a reliable idle. I Have found that a plug which is too hot (and that includes the one that comes with the engine) can drop the revs at full throtle as much as 400 rpm, and can actually cut out at full revs. So any time you go to full throtle the engine will run for a few seconds and than shut down abruptly, leaving you deadstick. I have been flying the 2000 on my Global PT-19 for a few years now (one of a few) and run a Rossy #6 plug with a TopFlite 18x6 turning 7700 RPM with the stock plug I was runing 7400 RPM. I also run Wild Cat Eliminator 15% fuel.

Thank You
Otto K.

(in reply to racer rob-RCU)
       Post #: 2

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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> what is a good prop for st3000
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