Helicopter engine runs

I recently found an Apache helicopter NOS. I put it together and took it out last weekend to try it out. The engine was started and I ran 4-5 tanks through it on the ground, very rich. I tuned it to just a "4 stroke", allowed the rotors to start generating lift and let it go. The thing would go up, start leaning out, and climb rapidly in a good 2 cycle, the just quit. When retrieved, the fuel tank would 1/2 full. It would do this for all 10-12 flights I made. I kept thinking it was leaning out too much, so I kept backing off the needle. I did this until it didnt have enough power to climb, and just hovered. Holding it in my hand, it will run the fuel dry at any needle setting.

Is the centrifugal action forcing the fuel to the side of the tank and starving the engine? Do i have a pick up to adjust?

Any suggestions would be appreciated.

I was pretty fun with just half an engine run, but would be a lot better with another hundred feet of altitude.

Yes, you are right about centrifugal action. Fuel line must be at opposite side. Open tank and change the direction of fuel pick up line to side.