This weekend i was forced to use 30% heli fuel in my OS32 powered Venture because the store ran out of my usuall 15% heli fuel. I was under the impression that 30% was going to make my engine more powerfull and the heli should outperform its usuall abilities, but instead it seemed to be on the week side on power and it was smoking more than it ever did before so it seemed to be running rich. When i used 15% I could pull out of a hover verry fast without my engine bogging doun but now with the 30% its started bogging almost to a stall when i climb out fast. So i first leaned it some and it got worst then i richened it even more that before and it did better but im still not shure why do i have to richen more for higher nitro than for fuels with less nitro? anyway the person who sold me the 30% said i could rilly tell the advantage of useing 30% over 15% when i start flying 3-D but so fare it seems 15 % makes the OS32 screem with more 3-D power. anyone know what i might be doing wrong? Ive got to burn up the rest of the 30% and would like to make the best of it.

Don't run the engine any more until you richen up the mixture ALOT! It is true that the 30% fuel will run stronger in most engines, but you must realize that it will also use alot more fuel to do exactly that. Nothing is for free, and even though you paid more for the 30% fuel to begin with, you will also use it up faster.

Nitro does not exactly add more power to your engine automatically. It allows the engine to make more power due to the extra oxygen and slower burning characteristics of nitro. The engine may make more power with more fuel, and also may make the engine run cooler when you are not running the heli real hard. Turn out your needles, and have some fun!

I have been using 30% in my TT50, but I may be switching to 15% soon. I have the engine set to where it runs very well, and very strong. However, it smokes so much if there is not a good wind I loose sight of the heli in the smoke while hovering. So until I really need the power I am gonna try 15% next time.

thanks i will richen it up, and yes i never saw such smoke almost looked like the field was on fire.

30% nitro makes more smoke because there is more oil in the fuel, you may not like it when you hover alot, but when you are going fast and doing aerobatics it shure looks good and helps you see the heli better.

Hi I am having engine trouble as well I am running a ENYA .50 ss w/gn type carb.It idles sweet and turns over effortlessly the problem is when I build up rotor speed usually at 1/4 throttle the engine quits I have been at this for at least 4 hours after work for about 3 days now.It's a three needle carb and I must have tried 100 different needle setting combinations.

P.S. Hope your hobby supplier gets you more 15% sounds like this 30% flying makes for one hell of a clean up after flying.

Sounds like its running too rich and putting out the fire. Understand that even in a 3 needle carb, the high end needle effects the entire range. The low and mid are just for fine tuning.