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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Combining a couple fuels
10-18-2017 11:53 PM  25 months ago
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MartyH

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Combining a couple fuels
There is so little activity on the forums other than this main one I hope Mark doesn't mind me raising this question here.

I'm sport flying a couple large Raptors. One has an OS 70 and the other an OS 91. I run 15% Wildcat Helimix. I have two cases of Wildcat 15% Premium for airplanes that I am just not using up fast enough. I know these two fuels have different oil packages but would there really be any harm to at least trickle in some airplane fuel with the Helimix?

The Helimix is 18% full synthetic

The Premium is 16% synthetic and degummed castor
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10-19-2017 12:35 AM  25 months ago
EEngineer

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TX

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With regards to the oil content, all it will do is dilute the oil content of the one will the most oil content....Logo 600SXs, 800XX, TDR IIs
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10-19-2017 02:21 AM  25 months ago
spaceman spiff

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Tucson

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Two cases is a hell of a lot of fuel to get rid of, especially by trickling it in with something else.

Take it to the local fields and see if you can sell it to some planker folks. Even if it sells a little cheap, it gets the job done quick with minimal hassle or possible risk to your heli.

Mixing oil types or even changing from one to another is said to be bad for an engine.
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10-19-2017 02:23 AM  25 months ago
EEngineer

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TX

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Always picking on plankers.....

j/k
Logo 600SXs, 800XX, TDR IIs
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10-19-2017 05:27 AM  25 months ago
dkshema

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Cedar Rapids, IA

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Castor oil is not necessarily heli motor friendly. Although it handles high heat better and is a bit more forgiving of a lean run, over time it will build up a thin layer of varnish on the cylinder walls and piston skirt. As this builds up, the motor runs hotter, makes more varnish and soon your motor runs poorly. Nothing a good cleaning won't fix, but heli engines are more trouble to remove and install than many plank motors.-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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10-19-2017 04:11 PM  25 months ago
MartyH

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USA

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dkshema Castor oil is not necessarily heli motor friendly. Although it handles high heat better and is a bit more forgiving of a lean run, over time it will build up a thin layer of varnish on the cylinder walls and piston skirt. As this builds up, the motor runs hotter, makes more varnish and soon your motor runs poorly. Nothing a good cleaning won't fix, but heli engines are more trouble to remove and install than many plank motors.
See, that's an answer I can use. I knew this but it helps when I read it coming from someone else.

There is no selling the fuel off to plankers, those lazy bums went electric. I guess I'll use this up a couple ounces at a time in my smaller nitro planes like Sig Wonder and Combat Gremlin. If it snows this Winter I'll put skies on my son's Pulse 40 and use it up a little faster that way.
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10-19-2017 04:20 PM  25 months ago
870heli

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Monson Ma. USA

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We ran caster oiled fuel back before there was heli fuel. Never had a problem. I have been mixing nitro fuels for 45 years. People have given me old fuel and I used it in planes and heli's. If your not a full on screaming 3D flyer or have a $5000 scale ship I wouldn't worry abought it.
Good luck.
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10-19-2017 05:59 PM  25 months ago
Jeff polisena

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westpalmbeachflorida usa

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My concern would be the inconsistent tuning . By the time you burn thru fuel you’ll need new carb from adjusting so much I stole it ,flew it and gave it back ;)
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10-19-2017 06:05 PM  25 months ago
AirWolfRC

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You said that castor was de-gummed ?
So . . . what's the problem ?

Have you considered running the castor fuel 100% ?
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10-19-2017 06:16 PM  25 months ago
spaceman spiff

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Is it gluten free?
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10-20-2017 01:26 PM  25 months ago
Tyler

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Chicagoland area

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Castor will stain your exhaust in very short order, but this will not affect performance for a very long time. Accumulating enough castor residue to negatively impact your engine will require a lot of flying. This would not happen with the amount of fuel you have on hand to consume. Also, you are going to dilute that castor % with your synthetic fuels.

I mix fuels all the time and have found that the needle changes are not very drastic. Because of the weather changes we encounter in the midwest, tweaking the needles a little each flying session is the norm.

I use a three gallon fueling station so mixing several gallons at once is no problem.

For years we flew cool power 15% airplane fuel in our helicopters successfully, but when I was able to afford 30% heli fuel all the time the benefits where noticeable and appreciated. We regularly would mix partial bottles of various formulas.

Now, I use Wildcat Curtis 30% blend and mix it often whenever I find an odd gallon of fuel that needs to be consumed.

Personally, if you don't mind the muffler staining I would suggest mixing a full gallon of your airplane fuel with two full gallons of your helicopter fuel and enjoy the additional air time with no extra $$$. If you don't like it after the first batch, go back to your normal formula.

If you demand the exact same tune every flight, you use every ounce of power, and you fly hard, you may want to just forego the blending. If you enjoy sport flying, managed 3D flight, or disciplined practice of basic orientations, maneuvers, and routines, then by all means take advantage of the free fuel.
Enjoy things that money can buy IF you don't lose the things money can't buy.
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10-20-2017 01:32 PM  25 months ago
EEngineer

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TX

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With regards to "staining".....I used to use Cool Power, when it had that green color.

It used to stain the inside of my YS engines....all of them....all the time.....lol

So I switched to Power Master....
Logo 600SXs, 800XX, TDR IIs
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10-20-2017 05:22 PM  25 months ago
AirWolfRC

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Castor will stain your exhaust in very short order
Ahhh yes . . . the dreaded spotted muffler disease.
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10-20-2017 05:57 PM  25 months ago
870heli

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Monson Ma. USA

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Yes but it had that race smell. LOL
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10-21-2017 03:04 PM  25 months ago
Dawiev

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Middle East

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Klotz smell is the best
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10-21-2017 03:39 PM  25 months ago
870heli

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Monson Ma. USA

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Yes the good old days of MX motorcycles !!!! I guess they still do that.
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10-21-2017 04:31 PM  25 months ago
icanfly

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ontario

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do some math, if you mix equal parts of 16 and 18 you end up with 17% and if the one fuel is 50/50 synth to castor it'll end up 25% of oil volume. I had mixed 30% with 20% and realized 25% (synthetic/castor oil mix), fiddled with tuning for a few minutes and had the needles set very good but messed the needles some more and disturbed the good power it had first (some people are never completely content if they know they try just that one more time to make it better, they don't always).

Personally I wouldn't worry too much since the %'s are very close and tuning shouldn't change if nearly at all.

I've messed with tuning my stihl chop saw this summer, what's the saying "if it ain't broke".
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