Castor Amount in Fuel  
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> RC Fuels >> Castor Amount in Fuel
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Castor Amount in Fuel - 6/23/2004 3:20:44 PM   
obolel


 

Posts: 244
Joined: 10/8/2002
From: Istanbul, TURKEY
Status: offline 		I was running %15 pure castor and %85 methanol, and my engines are performing excellent ( except YS, itreally needs nitro ). I am planning to reduce castor content to %10, does anybody tried this ? Although it seems low, I think excellent properties of castor oil will be enough even in that percentage mix.

Looking forward for your comments,

Thanks.
       Post #: 1

RE: Castor Amount in Fuel - 6/23/2004 4:31:20 PM   
Sport_Pilot



Posts: 7728
Joined: 1/21/2002
From: Acworth, GA, USA
Status: offline 		Maybe. Could be an expensive experment too. Let us know how it works out.

(in reply to obolel)
       Post #: 2

RE: Castor Amount in Fuel - 6/24/2004 4:04:47 AM   
downunder



Posts: 3198
Joined: 10/10/2002
From: Adelaide, AUSTRALIA
Status: offline 		Before you do that, get a thermocouple (not the infra red type) so you can keep track of head temps with the different oil contents. Personally I'd start with 20% castor and use that as a base line. You'd need to mix small batches of fuels so you can quickly do back to back runs.

(in reply to Sport_Pilot)
       Post #: 3

RE: Castor Amount in Fuel - 7/2/2004 7:36:32 PM   
Bax


 

Posts: 12457
Joined: 4/26/2002
From: Champaign, IL, USA
Status: offline 		You might also want to consider that as the oil percentage gets lower, you have less and less margin against a lean run, which can easily happen in an airplane...especially as the fuel tank gets low and you pull high-G maneuvers. The lower the safety marging, the more chance of engine damage.

Also, extra oil is a help in cooling. Heating something and then throwing it away means the heat goes with it. If your engine is assured of a constant fuel flow, then you can probably lower the oil content a bit. Only 10% oil content would likely be too low for most model two-stroke engines.

bax

(in reply to downunder)
       Post #: 4

RE: Castor Amount in Fuel - 7/2/2004 7:38:12 PM   
Bax


 

Posts: 12457
Joined: 4/26/2002
From: Champaign, IL, USA
Status: offline 		You might also want to consider that as the oil percentage gets lower, you have less and less margin against a lean run, which can easily happen in an airplane...especially as the fuel tank gets low and you pull high-G maneuvers. The lower the safety marging, the more chance of engine damage.

Also, extra oil is a help in cooling. Heating something and then throwing it away means the heat goes with it. If your engine is assured of a constant fuel flow, then you can probably lower the oil content a bit. Only 10% oil content would likely be too low for most model two-stroke engines.

We once ran a ducted-fan engine on 18% oil content fuel and had it immediatly seize the connecting rod to the crankshaft due to a lack of lubrication. Going to 23% oil content solved the problem. The two fuels, 18% and 23%, had the same oil blend, just different volumes per gallon.

bax

(in reply to downunder)
       Post #: 5

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