I have heard on a couple of occasions a very unusual sound coming from an RC jet which I am not sure how to describe. Almost a violent air sucking sound that seems to resonate from the inlets. One occasion the turbine quit and ended in a deadstick landing. Some were calling it a !QUOT!Compressor stall!QUOT!. Does anyone know what I am referring to?

Until recently I have never experienced it on any of my turbines. First incident was a P-60 in a Maverick conversion ( with Bandit inlets) on start up it began to make that particular noise and I just shut it down. Second start attempt was just fine and it has never occurred while in the air (that I am aware of). It has done the same thing one other time.

Second incident is with a P-120 that I just got back from its 25 hour checkup. It was installed right back in the same airframe ( S. Bandit) that has had almost 90 flights and starts without a problem. I just did a test start after re-installing the P-120 and after idling for a minute or so I began to increase to full throttle. Once it just about hit full RPM I started to get a hint of this puzzling noise that I have never had occur with this setup. I didn't want to disturb the neighbors any further so I shut it down.

Is what I am hearing in fact a compressor stall, and if so is it dangerous? Can anything be changed to alleviate the problem?

Both have Bypass installations with FOD screens.

Thanks for any help you can shed on this,


Jim