Here's the problem. I take off WOT and get up about 300-400 feet. I cut back the throttle to 1/2 or 1/4 to cruise mode and it dies. Sometimes if I only cut back to 3/4 throttle it'll stay running. If I fly for 5 minutes at WOT it'll stay running but as soon as I throttle back it dies.

The nitro is about 1 year old but if I put it in my car it runs fine. I'm running PowerMaster 15% airplane fuel and it's always stored in a cool dark area in the back of my garage on a shelf with no sunlight hitting it whatsoever.

The setup is a Bridi Aircruiser with a K&B .20 Sportster. I changed the motor out with one in my other planes to an O.S. .20 FP that I know works. Same problem again.

I checked the fuel line and tank for pressure and all seems fine. no leaks and good ease of fuel movement. Changed glow plugs and see no difference.

This problem does not happen on the ground, only in the air. I am in Southern California at sea level.

Anyone encounter this event before that this type of thing is a distict problem which can be pointed out easily?

When you throttle an engine back and it dies (but not on the ground) what typically is that a sign of?

The motors run like a champ on the ground! It just dies while flying.

Thanks in advance for anyones help.