[scochrane]

Purchased a Hanger 9 Alpha 40 and have been having multiple problems. First was the engine (Evolution Alpha) - had problems keeping it running when powering up to full throttle, engine usually dies. Corrected that problem by leaning the low, seemed to be too much fuel in carb and choked when going to full throttle. Now I can idle for 45-60 seconds and throttle up to full without hesitation or failure.

Now my problem is getting a full tank run. The Alpha 40 has an 11 oz tank and consistently the enging seems to lean out and quit after burning 2 - 3 oz. Consensis at the club is that the tank is mounted too low or air leak. Completely replce fuel tubing. I pulled the tank back a bit to clear the first bulkhead, raising the center of the tank 1/2" or so by doing this. Also foamed in the tank to keep it tight. Ran a tank through to empty on the bench. My concern now is that maybe the center of gravity is shifted - should I add weight to the nose or try a flight as-is?

[chuebner]

Originally Posted by scochrane

Purchased a Hanger 9 Alpha 40 and have been having multiple problems. First was the engine (Evolution Alpha) - had problems keeping it running when powering up to full throttle, engine usually dies. Corrected that problem by leaning the low, seemed to be too much fuel in carb and choked when going to full throttle. Now I can idle for 45-60 seconds and throttle up to full without hesitation or failure.

Now my problem is getting a full tank run. The Alpha 40 has an 11 oz tank and consistently the enging seems to lean out and quit after burning 2 - 3 oz. Consensis at the club is that the tank is mounted too low or air leak. Completely replce fuel tubing. I pulled the tank back a bit to clear the first bulkhead, raising the center of the tank 1/2" or so by doing this. Also foamed in the tank to keep it tight. Ran a tank through to empty on the bench. My concern now is that maybe the center of gravity is shifted - should I add weight to the nose or try a flight as-is?

Always recheck your CG after moving equipment around and balance to the recommended CG in your manual....... tailheavy is not cool when learning!!!

Cheers
Curt

[zdsh13]

Originally Posted by scochrane

Now my problem is getting a full tank run. The Alpha 40 has an 11 oz tank and consistently the enging seems to lean out and quit after burning 2 - 3 oz. Consensis at the club is that the tank is mounted too low or air leak.

Are you running muffler pressure to the tank? Your tank center line should be close the the needle valve height. By running muffler pressure back to the tank you will get more consistent needle valve settings. Lean your engine to peak RPM and then open the high speed needle 1/4 turn. You should be able to hold you airplane with the nose pointing vertical and have little to no RPM drop. If the RPM falls off some richen the HS needle more.

[michel gravelle]

Hi

After many thousands of hours , we at the club found out the problem with the Evo engine is the O-rings on the needle . Change them for OS , O-rings . It , IS , one sweet engine , after the change . Not the same animal .

Sure hope this helps

[Max]

Originally Posted by michel gravelle

Hi

After many thousands of hours , we at the club found out the problem with the Evo engine is the O-rings on the needle . Change them for OS , O-rings . It , IS , one sweet engine , after the change . Not the same animal .

Sure hope this helps

That's a good tip. I always disliked evo engines because they always ran like crap. I will attempt this on the next student I get with an evo engine.
Thanks

[moo]

Just a some thoughts - please comment

Set CG with tank empty so that it would be easy to dead stick a landing

Tank closer to CG is better as CG will change less with fuel weight (within reason of course, you want your fuel lines fairly short without a fuel pump).

[Patch]

Originally Posted by chuebner

Always recheck your CG after moving equipment around and balance to the recommended CG in your manual....... tailheavy is not cool when learning!!!

Cheers
Curt

Unless your the guy watching!

[Flyinbullmax]

Originally Posted by scochrane

Purchased a Hanger 9 Alpha 40 and have been having multiple problems. First was the engine (Evolution Alpha) - had problems keeping it running when powering up to full throttle, engine usually dies. Corrected that problem by leaning the low, seemed to be too much fuel in carb and choked when going to full throttle. Now I can idle for 45-60 seconds and throttle up to full without hesitation or failure.

Now my problem is getting a full tank run. The Alpha 40 has an 11 oz tank and consistently the enging seems to lean out and quit after burning 2 - 3 oz. Consensis at the club is that the tank is mounted too low or air leak. Completely replce fuel tubing. I pulled the tank back a bit to clear the first bulkhead, raising the center of the tank 1/2" or so by doing this. Also foamed in the tank to keep it tight. Ran a tank through to empty on the bench. My concern now is that maybe the center of gravity is shifted - should I add weight to the nose or try a flight as-is?

You say you changed all the tubing, but did you change the tubing in the tank too? Because the problem usually occurs on the pick up line(clunk) inside the tank. The tube usally has a little almost invisible cut close to the metal tube. So when the level of fuel gets under that line, it sucks air and kills the engine. Check that, I'm sure its your problem. And the Alpha is a darn well built plane and the tank is surely at the best place possible.