I am flying an xcell ct. with a OSWSX .61 engine and a Hatori tuned pipe. I have put 2 1/2 gallons of 35% cool nitro through my heli.
I am starting to fly loops and inverted, but the fuel is so expensive. I am thinking that I need to drop to 15%. What does everyone fly? Will it hurt the engine if I switch to a cheaper fuel? If I do decide that I want to go this route, is there anything special that I need to do to the engine?

I am also wondering if there is any real difference from the plane fuel compaired to the heli fuel I have heard that oils are different is there any truth to this? This sounds kind a strange to me.
I would love to hear what everyone has to say about this.

I think what you've suggested makes a whole lot of sense. Up until the 90's came out, a 60 size heli was considered a power monster. It's just a matter of what your expectation are. If you want the biggest, baddest ship; you've got to spend the money for it.

The two main types of fuel are caster and synthetic. Synthetic is more popular and costs only a little more. I use 15% CP to save a few bucks ($13/gal). It works fine in planks and helis, both 2 and 4 stroke.

Tom

35%!!!!!!!!! Jesus Christ!!!!!!!! that thing must rocket!!!!!

Can't say much about the cost as the price we pay over the pond here in the UK for fuel is stupid!!!!!

I've used Coolpower O% in my early stages of heli flying as i could'nt realy afford anything else (Budget Flying), as i moved on i moved onto 10% CP and also a fuel here in the UK called Bekra 10% from Model Technics, i also moved onto 15%CP HELI.

With these fuels i neved had a problem but my OS 61 SXH WC running on a Zimmermann quite pipe seemed to prefer 15% over 10% and runs superbly on it.

I also used the Bekra mix of fuel from Model technics, this was because of a shortage of Coolpower last year and i had to find an alternative, this fuel was ok, you got more fuel for your money 4.55 litres as opposed to 3.78 i think it is, ok but at the time i wasusing it it had less oil than CP and i buggered an engine.

I prefer Coolpower and still do but i have recently moved onto Magnum 30%, this is great stuff!! 22% oil and runs superbly!! my engines run realy cool, a little smokey but i like it, really cool smoke trail and looks ace when you do flips and stall turns etc...

A little bit more excess oil left on the model than CP but at least i know the engine is getting everything it needs. Also i'm paying for a gallon of 30% Magnum what i was paying for 15% CP.

Cheers!
Rotorhead486

One Reason For Crashing'Rogue Servo Bent on World Domination'!!
FLP Flight Team

Holy cow dude....15% will be a better mix for ur heli. I use a japanese type fuel that i have never heard of but its 15% with 20% synth lube and my heli runs beautiful on it. I would stick with cool power or wild cat 15%...better off especially with a guzzler.

It takes a high school education to fix em but a college degree to break em

My heli does rocket. The only problem is that with stock tank on the Xcell I fly I only get about 15 minutes on a full tank and isn't even flying it hard. This is why I thought about going to either a 15% or 20% fuel. from the sounds of it, it looks like 15% is the way to go and it is definately cheaper which is what I am looking for.

Personally, I think 35% is a little strong on the nitro content. I mix my own fuel and I run 30% Klotz Nitro and 15% to 18% Klotz 100% synthetic oil. In warmer temps I run the 18% and cooler I'll back it down to 15% oil. I don't run any castor in my helis since the castor deposits eat up the finish on the mufflers pretty bad over time. If I was running castor in my heli oil I would back the total oil content back even a little further since the castor acts as a stronger bonding agent to aid in the life of the bearings.The main thing is to find a good fuel and stick to it. Most of the time when you change brands you will have to re-tune to that fuel even though the contents may be exactly the same.