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Old Feb 08, 2005, 02:30 AM
neniwein is offline
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Fuel issues for COX 0.049

Hi All,

I'm Oren from ISRAEL, came back to nitro, from the electric world, tired of charging batteries all the time (an carry thier weight after it ran "out of charge").

I bought 0.049 blackwidow engine and using BYRON, 5%nitro-methane with 16% of synthetic oil.

Someone told Me not to use such fuel cause it can damage the engine for the long-run (according to him I should use nature oil with 20%nitro).

Should I stop using the BYRON, has anyone heve recomandations or experience?

Many Thanx, Oren

i.e - I have build Dynaflight "skitter" and flew it with a carbon POD made by a friend - will post pic later on
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Old Feb 08, 2005, 06:32 AM
Bipe Flier is offline
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I agree with your friend. 20% Castor oil and 20% nitro is a good mix to use. 16% oil is too low for an .049 and Castor oil protects better.
Old Feb 11, 2005, 09:58 PM
wrenwright is offline
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Byron makes an all-castor 1/2 fuel. Get some of that. It's good stuff.
Old Feb 11, 2005, 11:35 PM
Tim Wiltse is offline
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Cox engines need straight castor oil as the lube. The piston ball socket will wear out very fast without the castor oil. The castor also helps the reed seal. Also the small 1/2a engines love nitro so the more the better. I am sure you may be limited on what you can get over there. Even though the nitro level is low I have found my Cox .049's love SIG Champion 10% nitro all castor fuel. I believe it's 25% castor.

Old Feb 12, 2005, 01:37 AM
neniwein is offline
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I found in Here chemicals store and can get methanol, Castor and nitro.

As much as I now one should mix (as mentioned by Tim) 25% of castor, 75% of methanol and add something around 10% of nitro to the castor/methanol mixture.

Is it true?
Old Feb 12, 2005, 02:34 AM
Bipe Flier is offline
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If you can mix it yourself, I'd use 20% Castor, 20% to 25% nitro and 55% to 60% methanol.
Old Feb 12, 2005, 05:31 AM
ron ferrer is offline
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bipe is right. sig champion is 20% oil. 20% nitro is a good mix. I would stay away from byron in 1/2a fuel because of the glow plug element coating issue; coats elements on norvels, lot of posts about that some time ago. used to use sig champion in quarts exclusively in my 061, 35% nitro. I fly 074's now, they run fine on less nitro. still got a black widow lying around, though!
Old Feb 12, 2005, 01:12 PM
TLyttle is offline
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Yeah, Cox engines REALLY NEED lots of nitro, and castor oil only. Read an old article on some really fast 049 model, running 80% nitro (EEEK!!).
Old Mar 05, 2005, 01:00 PM
rperry is offline
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One problem when you start getting up in really high nitro is that the caster will not mix well. I have seen it turn into little snowflakes in the fuel when you get up around 40%. This will glog your needle. A fuel maker told me that when you get that high you must use high quality synthetic only. HIGH quality synthetics are rare in most fuels which is why adding caster is a good idea.
Old Mar 06, 2005, 06:33 AM
DICKEYBIRD is offline
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Byron 1/2A fuel coating glow plug elements? Another "I read it on the internet so it must be true" myth. That got started over on RCU by 2fast4u but his info was Norvel based. Maybe something Norvel plug specific or he was using some other Byron fuel blend....dunno. Never trust a Norvelite.

I've been using Byron 1/2A fuel since they 1st put it on the market with nothing but excellent results with Cox engines I used it as is for a couple years before I started adding 1.5 oz. Sig castor to bring the lube % up to 20%. At my flying field's altitude, I need 4 gaskets and a low compression head for steady running and a happy needle. YMMV

Here's a link to an online fuel calculator that takes away the math misery of fuel mixing.

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