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Fuel Question

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Fuel Question

Post  Cox 049. on Thu May 03, 2012 1:55 pm

Hey everyone, I have no more fuel for my Cox engine so i was wondering will regular rc plane engine fuel work? I have heard you need specific amounts of oil and nitro for the engine to run if you could tell me that would be great. thanks. Small Cox Logo
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Re: Fuel Question

Post  nitroairplane on Thu May 03, 2012 2:08 pm

Cox 049. wrote:Hey everyone, I have no more fuel for my Cox engine so i was wondering will regular rc plane engine fuel work? I have heard you need specific amounts of oil and nitro for the engine to run if you could tell me that would be great. thanks. Small Cox Logo
Nitro does not really matter but you need at least 20% oil and at least 1/2 of that must be castor oil.
But I recommend all of the 20% oil content be castor oil.
Around 25% nitro is nice.
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Re: Fuel Question

Post  Cox 049. on Thu May 03, 2012 6:03 pm

Why must it be castor oil?
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Re: Fuel Question

Post  nitroairplane on Thu May 03, 2012 6:09 pm

Cox 049. wrote:Why must it be castor oil?
Small engines need castle because it is the best lube for them. It doesn't burn off and without it the ball socket joints wear out and the engines have very soft cylinder and without castor oil they lose compression.
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Re Fuel Question

Post  proctor on Thu May 03, 2012 6:15 pm

Mostly because Cox recommend it and they knew their stuff.
Also because the ball and socket small end gets very hot and
synthetic will break down, castor won't.
If you want your Cox engines to last, use all castor. John
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Re Fuel Question

Post  proctor on Thu May 03, 2012 6:19 pm

nitroairplane wrote:
Cox 049. wrote:Why must it be castor oil?
Small engines need castle because it is the best lube for them. It doesn't burn off and without it the ball socket joints wear out and the engines have very soft cylinder and without castor oil they lose compression.

Sorry, didn't get a prompt that you had already posted an answer. John
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Re: Fuel Question

Post  Cox 049. on Thu May 03, 2012 6:32 pm

Will this work? Brodak 10% nitro 11.5% castor oil and 11.5% synthetic oil, it says it s for Brodak engines, will this work with a cox?
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Re: Fuel Question

Post  dckrsn on Thu May 03, 2012 9:06 pm

Sounds OK to me. At 10% nitro you're going
to be running somewhat tame.
Over 20%, and I'd add a little more castor.
Join the forum and use the search feature.
Welcome either way,
Bob
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Re: Fuel Question

Post  Cox 049. on Thu May 03, 2012 9:46 pm

Would 10% nitro make a big difference in power? I haven't joined the forum cause I heard you get tons of e-mails to say your watching a topic.
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Re: Fuel Question

Post  andrew on Thu May 03, 2012 11:47 pm

Cox 049. wrote:Would 10% nitro make a big difference in power? I haven't joined the forum cause I heard you get tons of e-mails to say your watching a topic.

First, email notification is a feature that may be disabled in your preferences. The only email I receive is when someone has sent a PM.

A good source for 1/2A fuel is GlowPlugBoy fuel. You can get 24% nitro/17% all castor fuel for $10 a quart. Shipping on the first quart is high, but additional quarts ship for $2.00 each. Two or three quarts of fuel will go a long way in 1/2A engines. The higher percentage nitro will improve power, but it also eases starting and tends to broaden the needle, i.e., the needle will be less difficult to set when tuning for peak or near peak RPM. Lower percentage nitro fuels can make the "sweet spot" more difficult to locate and maintain.

http://www.gcbmrc.com/GlowPlugBoy_prices.htm

SIG Manufacturing sells their Champion fuel in a 25/20 nitro/oil mix with a 50/50 synthetic/castor blend for $8.39 a quart..

Another option is to buy a high nitro/low oil content car fuel (I use Morgan's Sidewinder Pro 20/10 and 30/10), then add castor to bring the oil content to your desired level. I enjoy tinkering with fuel mixtures, but for the casual user, buying SIG or GlowPlugBoy fuel is probably the best approach.

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Re: Fuel Question

Post  SuperDave on Fri May 04, 2012 9:37 am

Castor and synthetic oils serve two puposes in our Cox engines:

- they lubricate vital parts

- they assist in carrying away heat that would be destructive to the engine

Poor lubrication destroys engines.
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Re: Fuel Question

Post  RknRusty on Fri May 04, 2012 11:14 am

Ditto on the Glowplugboy. It runs better and smoother than anything including Sig in all of my engines. I add 1.3 ounces of dollar store Rexall castor oil to a quart to raise it to 20% oil. Just because I like running high engine speeds. He ships fast too. If you buy 4 quarts he told me he will make any custom mix you ask for.

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Re: Fuel Question

Post  cox 049. on Fri May 04, 2012 11:37 am

Okay thanks very much for the replies, I will check those fuels out. Small Cox Logo
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Re: Fuel Question

Post  RknRusty on Fri May 04, 2012 10:35 pm

You're welcome, I hope you'll join up with us.

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what fuel to use

Post  coxxoc on Fri May 04, 2012 11:46 pm

Hi,

I own a Black Widow .049 and I use a fuel of medium nitro rating i.e. about 15% nitromethane,
25% Newton R castor-oil, and 60% methanol.

I hope this helps?

Mr G Beer Cheers
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Re: Fuel Question

Post  SuperDave on Sat May 05, 2012 11:00 am

My Cox Black Widow's and TD .049's seem to thrive on SIG 25% nitro for general flying or, in the extreme, 35 when maximum erformance is desired. Never tried Glo-boy so can't realistically evaluate it.

Note: I tend to run larger rather tan smaller props depending on the aircraft.
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