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HomeAircraftHelicopterMain Discussion › Changing the composition of FUEL
03-10-2010 08:04 AM  8 years agoPost 1
Mioca

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Budokai Tenkaichi

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By Dave Gierke

Occasionally, you may want to change the component percentage of an existing fuel, such as increasing its castor oil content. This would be advantageous for the break-in and normal operation of certain engine types (e.g., ringless iron/steel pistons/cylinders; plain-bearing crankshaft support). What are the requirements? You must know the existing oil percentage, and the quantity of the fuel to be changed.

Example
If 1 gallon (128 ounces) of the existing fuel blend contains 18% castor oil and you want to increase it to 22%, the oil content needs to be increased by 4%. \Here's a formula that tells you exactly how much castor oil to add:

Ounces To Add = (F - I) x A / 100 - F

F - is the final percentage of oil desired
I - is the initial percentage of oil already in the fuel
A - is the number of ounces you are treating.

Example
If you have 1 gallon (128 oz.) of 18% synthetic oil fuel, and you
want to add castor oil to bring it up to 22%, then find the following:

F = 22; I = 18; F - I = 4

In the numerator portion of the formula, because there are 128 oz. in a U.S. gallon, multiply 4 x 128 = 512
In the denominator portion of the formula, 100 - 22 =78

Finally, 512 / 78 = 6.6 oz. (195.2 ml)

There might not be enough room in a gallon can to accept the 6.6 ounces of additional castor oil. You may have to mix everything between two 1-gallon jugs. You can also use this formula for increasing a fuel’s nitromethane or methanol content. Of course, when you increase the percentage of these chemicals, the total volume of the fuel may change significantly; so recalculate the lubricant percentage based on the new total volume and modify as necessary.

ADDITIONAL INFORMATION
Many technically minded modelers may want to consult my book, “Power: Beyond the Basics (available at the rcstore.com) for additional information and techniques concerning glow fuel; some of the topics addressed include:

·Determining an existing fuel’s lubrication content
·Mixing your own fuel (getting the chemicals, obtaining the hardware, calculating the volumes, transferring the fuel blend, fuel use tips)

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03-10-2010 08:43 AM  8 years agoPost 2
JRjoe

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Jonesville , IN USA #1

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Thanks for the formula, i can see where it could be very helpfull.One question, you mention castor oil? Sorry but i would never run fuel in my heli motors with castor... Not trying to jump you i'm just sayin....
oil is oil so no matter what your info is still valid..


JRjoe.....
Indoor plumbing??? No, we don't need that!!!

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03-10-2010 11:48 AM  8 years agoPost 3
GMPheli

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W. Bridgewater, MA USA

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Quite a few people (myself included) still run a percentage of castor.

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03-10-2010 02:50 PM  8 years agoPost 4
GREYEAGLE

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Flat Land's

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Well I'm NO Chemist of fuel Al chemey but:
Well Written !!!!! - Period !

It'd be nice just to see a basic chart for Fuel lubricant's in OZ's just for glancing when inoculating the jug's

I hate crunching number's I'm in a hurry - I shoot every jug ------period.

The only reason : - I very - very rarely have a bearing problem, and never fry a piston and cylinder. I used to run pure syn - but now I want just a touch of security do to the operating condition's of a heli - motor.

The lubricant = the most expensive component.

Is the lube measured by % ?, by weight ?, by volume ? , or : measured by: {Comparably Performance} " same as" one of the above - if it is a synthetic ???

Even at 10% oil content in a 128 OZ jug- --that's (12.8 OZ) & do the math on 22%. Then just turn around and check the cost of a good synthetic lube $$$$$$ even a quart . That's almost just the cost of a gallon.

Is their really that much of a lubrication package in that brew???

Thank's for the Eye opener

greyeagle

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03-10-2010 05:00 PM  8 years agoPost 5
Mioca

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Budokai Tenkaichi

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One question, you mention castor oil? Sorry but i would never run fuel in my heli motors with castor...
Castoir oil is an example, you may use synthetic oil.

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03-10-2010 08:18 PM  8 years agoPost 6
Saint728

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Honolulu, Hawaii

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That chart is fine and dandy if you are looking to add more oil to your already made fuel, but it also decreases the amount of nitro and methanol as well. Just a thought to consider when adding more oil to your mix.

Take Care,
Cheers, Patrick

Check the hotties in my Gallery
http://rc.runryder.com/helicopter/gallery/9019/?all=photo

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03-10-2010 08:39 PM  8 years agoPost 7
Gearhead

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Vt

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""Here's a formula that tells you exactly how much castor oil to add""

orrrrr you could look on the back of the bottle

Jim
Buzz Buzz Buzz

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03-10-2010 10:46 PM  8 years agoPost 8
GREYEAGLE

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Flat Land's

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Oh Heven's : Mercey
I forgot to call home !!! I sure miss the Chief. Those were the day's !

greyeagle

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03-11-2010 12:35 AM  8 years agoPost 9
mdu6

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Montreal

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03-11-2010 02:17 AM  8 years agoPost 10
Mioca

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Budokai Tenkaichi

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If you aren't good with maths download this freeware

http://www.birdcagesoft.com/winheli/

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03-11-2010 03:41 AM  8 years agoPost 11
davebNZ

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Wellington, New Zealand

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For a mobile fuel calc in your pocket there is an iPhone/iTouch app for this

http://itunes.apple.com/app/rccalc/id303636500?mt=8

I love it

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03-11-2010 04:11 AM  8 years agoPost 12
GREYEAGLE

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Flat Land's

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Why so difficult you got to have a APp ??
Can't wait for an electronic wipe.

Stick it in their, suck out a OZ, stick it in over their, squirt - done.

Edit: Edit - I forgot : Put it on the floor and roll it around with your boot.

greyeagle

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