I've been running Byron's 10% nitro in all my glow engines. I did notice however that my Pete 'n Poke (saito .56 w/12x6 prop) flew like a wet noodle. Yes its got a draggy type wing and airframe but I had plane at just about full throttle the entire flight.
My other planes have OS, Thunder Tiger and Evo .46's. They fly fine with Byrons.
A guy at the field the other nite was telling me he switched over to Cool Power 15 %. He claims a performance was much better plus,
4 strokers like the higher nitro content. So, I bought a gallon of 15% cool power.
Also, while on Morgan Fuel's website, they were saying about draining your tank at the end of the day into you fuel jug. Basically,
it contaminates the whole gallon because during flight, moisture forms inside your plane's fuel tank Morgan says to just drain out all the fuel at the end of the day. So, is this a ploy for people to pucrchase fuel all the time?

Dave...

I suspect Morgan knows much more than me. I also suspect they have more money and enjoy adding to it.

I and everybody at my field drains their planes tank into the jug it came from then run out the fuel fuel lines.

Can't say nobody has ever or will ever have a problem but so far I have had no problems and nobody I know has had problems either. At least we don't know it if that is a problem, we have had reluctant engines. Mostly old engines. I always shake my fuel up a bit before fueling.

As for the Saito I run Power Master 30% heli in mine. This was a suggestion by Horizon and Mike McConville and my LHS. Messy but nice performance. Saito says 10 to 30% synthetic.

I have run my Saito .72 on 15% Cool Power as well. It runs smooth and strong with that too. For all the rest of my 2 strokes I use the Cool Power 15%. Probably go to that myself in all my engines when the other jugs are empty.

I think you will be happy with the 15%. As for the impurities its probably true. True in you car too. I am am not dumping fuel on the ground or taking the unused fuel to the recycle place if there is one. At what it cost a gallon I don't worry about it.

If you have a tach. check out the differnce of the two fuels with the same prop.

Moiature in the fuel doesn't affect performance much. One of the writers, for Model Aviation if I remember correctly, added as much as 10% water to his fuel to test the "moisture" theory, and he actually found a small increase in performance (RPM) with a little water.

It wasn't a real scientific study with tight controls, but it convinced me that I don't need to worry about a little water in my fuel.

A little fuel left in the engine however, will attract moisture and cause rust and corrosion.
Dennis-

Hi!
You don't have to empty your fueltank!!
Simple as that!
Just fuel up and what's left in the fueltank ...let it be...done this for 30 years without problem.
Regards!
Jan K
Sweden

I've been using Cool Power 15% for about 4 years now. I always pump my fuel from my plane back into the jug and I've never had a problem.

Ken

When you finish for the day, you leave fuel in your tank? Hopefully you plug the lines to prevent evaporation.

DBCherry is correct. I would expect an increase in performance with a small amount of water. Water injection has long been a trick for high performance engines that are tuned towards high heat and detonation. Long explanation as to why, answers can be found on-line.
The glow RC engine is a high performance engine. The HP to Cubic Iinch ratio they produce is impessive indeed.
I suspect leaving the fuel in the tank is OK too. I do not do that for issues in transportation.
A big day of flying for me puts planes in all sorts of positions in the back seat and bed of my truck. I perfer not to have an fuel/oil stain.
Much easier for me to simply drain, run out the excess and clean before transporting. Cowl removal etc.

Debates both ways here concerning leaving the fuel in the engine. I don't and I remove the glow plug once home and put a couple of drops of my inexepensive pick of oil. Turn it over flip the prop to circulate the oil. Works for me.

Now what I do for batteries in my electrics...just kidding.

Cheers
Michael

Thanx for the opinions! According to the Morgan site, you don't need after run oil either when using their fuel. I guess it has some kind of additive. Currently when I'm done at the field, I pull the fuel intake hose and let the engine burn whatever is left in carb and cylinder.
Then I pump out remaining fuel from the tank. I have these little red rubber caps that fit perfectly over the carbs and then I plug the
exhaust hole too. Planes are stored in my basement which a dehumidifier runs all the time. I have never noticed any leaking of oil when in transporting mode.
The Morgan Cool Power is $1 more than the Byron's. So, if my planes run even better, a buck aint gonna break the piggy bank.
Plus, I don't fly competition anyways. If so, I could see draining the remaining fuel into another container.
Sure is alot of different theories on what fuel to run in 4 strokes. I've seen even 5% nitro up to the 30% heli fuel. And, different parts of the country and world for that matter have different weather and climates. What may be good in Finland may really stink in south Florida. Anyways, thanx for the input. Tomorrow is one of the clubs I belong to pic nic fun fly. I guess I be goin "green"!!!! LOL!!!


Dave...

I've never used after run oil and my engines always start up the first time at the begining of the season. Good fuel like cool power should leave a slight film of oil in the engine that should protect it for some time after it has been run. Just my opionion though.