Well, Thursday was a perfect flying day although it was HOT and HUMID...so we take the planes out and do a little flying...or so we tried...my tower trainer....made my first take off...going good until I make my first turn...my tower .46 quits....so my buddy brings it in dead stick...we try tuning a little...didnt work...new glow plug seems good...my second take off...prettier than first....makes a couple figure 8's and get excited and do my first aileron roll...then bank her up for another pass and yep....engine quits again...she got grounded after that...so we fueled up my pulse xt pnp...my biddies big stick with os 46 ax wouldnt fun either....the evo runs like a champ so he flies her around a bit...lets me take her around a little and then he lands her...frustrating and fun day all in the same.

G'day Jody,
Hows it hangin, Glad you are getting some flying, try a few clicks richer the next time you fly, hot & humid needs richer mixture than cool weather.
When you have your motor running at full throttle, lift it nose up & listen to the engine, if it pick up some speed, as the nose is raised, it is rich enough, if it doesn't, richen it a few clicks & try again, don't try for max speed on the ground, as it will always be too LEAN, to fly.
The engine needs to be slightly rich before take off, so it has enough fuel, too allow the engine to unload in the air. The faster the engine revs, the more fuel it needs, in the air.

G'day Alan long time. Yeah that was only the second day of flying I have gotten in. I knew it had to be a tuning problem but we could not get it adjusted right. It was to the point I was ready to put one of my evo's in it...both evo 46's I have have both run awesome. I am hoping I dont have a lemon of an engine. My buddies uncle, who usually flys with us, was not there and he is much more of an engine expert than we are. Maybe it is just an tuning issue. Thanks again Alan!!!!!

Hot, humid air may require retuning the carb, but, it needs to go leaner, not richer. Hot, humid air contains more water vapor and less oxygen, need to lean the mixture to get the proper combustion mix.

G'day Jim,
It is very rare for an engine to stop because it is a bit rich, but lean, is a sure way to get em to quit.
It still sounds like it is lean, at least to me, going by the symptoms described.
Hot, richer, cool, can be a bit leaner. IMHO.

I guess the bottom line is to adjust the needle untill it runs best, using the nose up test to insure against overly lean setting.

Lawdawg131 the Tower Hobbies .46 is a GREAT little engine.

Some tips.

Loosen the carb retaining screw, turn the carb itself to loosen it and press the carb against the engine TIGHTLY while retightening the retaining screw. This helps to eliminate any air leaks.

After you have run the engine for a bit ( which you have ) tighten down ALL of the cap screws. Also tighten down the fittings and remote needle valve. As they come they tend to leak air after the engine has been run. Don't overdo it though!

Retune the engine with about 1/2 a tank of fuel in the plane.

Set it for optimum RPM's at high throttle and back off about 3 clicks.

Set the idle needle for optimum RPM ( you'll notice a change in sound ) and again back off about 1/8-1/4 turn.

Let the engine run for a while. Does it slow down at idle and die after 2-3 minutes or more? If so it's too rich on the low end.

Point the plane nose up. Is the idle still OK albeit a bit faster?
Run the engine up with the plane nose up. Is the high throttle OK albeit a bit faster?

Point the plane nose down about 45 degrees or so. The engine will slow down but it should NOT shut off.
Do the same check at idle. Make sure that the engine does NOT shut off when the plane idles nose down.


You are trying to hit the "window" where the engine will not shut off in any attitude. Usually once you find this, the transtions will also tend to be OK.


If you find that nothing you do seems to get you to this point, look to problems with your fuel system.


Also the T.H. engines don't settle in until you've run about a gallon of fuel through them.

or just pinch and release the line.. .same thing... easier than lifting the craft each time toverify adjustment. Lift at the end to verify the setting
mike

No this is not the same thing.

The pinch test is needed, but the nose up/down test will give a much better indication of how the plane will react in different flight attitudes.

e.g. the pinch test will not catch problems with fuel line flow, etc.