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HelicopterMain Discussion › Fuel question
03-10-2003 04:40 PM  14 years agoPost 1
Jamovich

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Bangalore, India

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I moved here to India recently for some work experience, and I also got myself into this wonderful hobby (started with a Kyosho mad force!! . ) Since there are no more than 15 people, I think, that fly/run r/c stuff, there is no readymade fuel available here. Therefore I mix my own using 20% castor oil, 15% nitro, and 65% methanol. It runs great, but the castor oil causes huge gumming problems, and the engine needs after run oil after every use. This is ok in a gas car as the access to the carb is easy, but in a heli this requires removing the muffler, screws etc. A real headache. In fact I ran my heli for a week without using after run/cleaning the engine out. I just happened to take it apart because of some stability issues, and the entire inside of the engine was midnight black! I was able to clean it off with methanol, but it left a slight stain. I hear that there is some kind of castor oil that is refined enough to be used in machinery (I use the stuff found in pharmacies). Would this be a good substitute? I think that would drastically cut down on the gumming issues. And what is it called? (I believe there is some kind of grading for it)

I hope u guys can help me out!

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03-10-2003 05:39 PM  14 years agoPost 2
WMac

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Skotlande

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Sorry, cant help you on your main problem but to get after run oil in without taking the engine out just connect a piece of fuel tubing to the spout of your oil bottle and hook the other end up to the carb.

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03-10-2003 05:48 PM  14 years agoPost 3
Simmer

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Massachusetts

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there are many grades of Castor and Methenol. If you do not get the more pure stuff you will run into problems.

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03-10-2003 06:03 PM  14 years agoPost 4
Jamovich

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Bangalore, India

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This is interesting

Methanol occurs naturally. It is a natural constituent in blood,
urine, saliva and expired air. Mean blood methanol levels of about
0.73 mg/litre in unexposed individuals have been reported. A mean
level of 0.25 µg methanol/litre is expired by unexposed humans. The
two most important sources of background body burdens of methanol (and
its metabolite formate) are diet and metabolic processes.


I know where I am going to get my next supply from!!

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03-10-2003 06:56 PM  14 years agoPost 5
andy_s

rrNovice

Mo

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have a look at this jamovich
it may help ya out a little
http://www.harcohobbies.com/articles/nitro_fuel.asp

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03-10-2003 09:36 PM  14 years agoPost 6
AirWolfRC

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42½ N, 83½ W

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Make sure that you are using degummed castor. That will get most of the resin out of the oil. If you can't get that then switch to a 100% synthetic oil for your mix. Synthetic is fine so long as you don't run excessively lean for too long.

Wolfgang

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03-11-2003 09:19 AM  14 years agoPost 7
Jamovich

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Bangalore, India

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synthetic oil

Degummed castor oil is going to be quite hard to get here as it is mainly produced for export (the boonies I tell you!!!) I am far from an expert engine tuner...in fact I hate it!!! So a pure synthetic oil mixture would be dangerous for me to use with my lack of expertise.

I dunno what do do...if I am lucky I might be able to get the degummed stuff...but it is not going to be easy insuring a steady supply!

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03-11-2003 02:26 PM  14 years agoPost 8
AirWolfRC

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42½ N, 83½ W

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The only advantage that castor has over synthetic is it's somewhat better high temperature survivability. I would not say that the difference is like night and day. There is no great "danger" in mis-tuning.

If your engine gets a bit stronger as you get to the end of the tank then you have it tuned just about right.

Wolfgang

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03-11-2003 02:36 PM  14 years agoPost 9
Jamovich

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Bangalore, India

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synthetic oil

If I go for a pure synthetic oil mixture, what kind should I look at? Standard 2 - stroke motor oil? (Kind they use in motorcycles).

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03-11-2003 02:59 PM  14 years agoPost 10
AirWolfRC

rrProfessor

42½ N, 83½ W

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Just get the best that you can find. That should work well for you. Synthetics of today are a lot better than what was available when castor became popular.

Then you can say good bye to the dreaded spotted muffler desease.

Wolfgang

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03-11-2003 04:05 PM  14 years agoPost 11
PPLON

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Mexico City

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please tell Us the commercial oil that could be use... synthetic of course.....


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03-12-2003 04:47 AM  14 years agoPost 12
hyflyr

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Baton Rouge, LA

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You might be able to find some degummed castor oil in the motorcyle shops. The offroad dirt motorcycle guys run it. They also use some synthetic stuff that is compatible with methanol as well. Check out some of the motorcycle places. Castrol makes some.

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03-12-2003 04:52 AM  14 years agoPost 13
JCadwell

rrKey Veteran

Richland WA/ Morro​Bay, CA

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Klotz makes synthetic oils specifically for RC models...

Thanks, John Cadwell

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03-12-2003 06:33 AM  14 years agoPost 14
Jamovich

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Bangalore, India

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dude

look at my location =P There is NOTHING available for hobby applications here..that would include dirt bike shops... i will have to look at regular engine oils.

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03-12-2003 06:47 AM  14 years agoPost 15
Dansam

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Egypt

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Jamovich, I too have the same problem since I arrived to Egypt (at least you are lucky to find nitro in India).

You need to be careful with your blending ratios since you will need a little bit more cooling than you would back in the US. The temperatures are too high in this region and I did experience overheating problems one day after 4 tanks of flying.

By using natural Castor Oil, I resigned to the fact that my engine will always have black tarnish since it would be impossible to disassemble it for cleaning every time. You need to carefully watch its performance and listen to its sound.

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03-12-2003 07:02 AM  14 years agoPost 16
Jamovich

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Bangalore, India

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hmm

Well I can tell you, if u have easy access to your carberator, use after run oil after every flight and you won't have ANY tarnish. (That requires me unscrewing 6 damn nuts every time!! =( ) I have a madforce 4X4 witha .21 engine, and I can easily pour it in after every use. The engine is a bright silver color inside! I have been using it over 8 months now. If the engine shuts in the car no biggie...it will just stop...but in the heli it would lead to a crash...so therefore I do need degummed oil....or some substitute to ensure consistent performance. I am not a pro at auto rotations =P This country is the biggest manufacturer of castor oils for all kinds of applications...there must be a way to buy it some how!!! I am surprised that you don't find nitro in Egypt. I am sure they use it laboratories....you can always find a supply thru a unversity. I lived there for 3 years - granted I was not in the hobby at the time. The science lab at the American University of Cairo might be able to help! =)


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03-12-2003 03:53 PM  14 years agoPost 17
hyflyr

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Baton Rouge, LA

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Well go electric. The electric helis are doing really well now.

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03-12-2003 04:00 PM  14 years agoPost 18
JCadwell

rrKey Veteran

Richland WA/ Morro​Bay, CA

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"dude"... Sheesh

Contact

Castrol India Limited
104 Rohit House
3 Tolstoy Marg
New Delhi 110 001
India

Tel 00 91 (11) 331-8038 /8039 /8040

Fax 00 91 (11) 331-8812


Inquire about "Castrol M". This is a straight Castor which should work more affectively for you.

Thanks, John Cadwell

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03-12-2003 04:04 PM  14 years agoPost 19
Jamovich

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Bangalore, India

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Electric??!?!?!

one word: YUCK

the idea of flying for 8 mins then recharging for 2 ****ing hours does not appeal to me!!

Plus electrics IMHO are for "toy" applications =P

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03-12-2003 04:07 PM  14 years agoPost 20
Jamovich

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Bangalore, India

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Thanks John!

I will check that out! But are you sure they would have Castrol M? I guess I will find out tomorrow!

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