Matt,

I talked with Bob on my issues and determined it could be a pump or "sucked air" or possibllt an RPM sensor type failure. He told me the last 8 seconds of data gets kinda screwy if you scroll up and down/left and right repeatedly. I fired up the turbine the other day pushed the rpms up to about 85k sitting on the ground. Basically I wanted to see if it would fail again around the same level of fuel or just fail periode. While running at 85k I was periodically shaking the plane around trying to induce a failure. I was not able to produce a "fuel failure" but what I did notice on two or three occasions was that the rpm's would drop down to about 75k. I thought it was based on me shaking the model but also noticed it doing it without me shaking the model. When the rpms would decrease you would notice the PV jump up around .3 or .4 volts to get the rpm back to 85K.. then it would over shoot it and drop the pump voltage back down. This kinda goes along with what I was telling bob that since day 1 on the turbine I noticed the rpm would surge a bit on the ground after a flight. Not so much on startup/learn low only when I returned from a flight. I never second guessed the symptom because it dsplayed this behavior from day 1. Sorry to be so long winded just wanted to get your thoughts on this and see what you thought about the following.

1. If I manually run the pump at a set voltage (fuel line disconnected from turbine) for 3-6 min, do you think that might help determine if it is a bad pump? (pump surge/ bad brushes/ etc etc)
2. Kinda hard to determine if it is sucking air while turbing is running. Do you have any tips/ideas on how to find something of this nature if it is sucking air (avonds F-15)
3. watching the rpms on GSU I am not seeing any fluctuation (sp) except described as above. Don't know if that could be a bad RPM sensor. Any thoughts on determining a bad RPM sensor. When I manually spin the turbine it spins up to about 7-8k starter alone. As it is rising I am not seeing any "jumping" of rpm either. doubtful of rpm sensor but want to hear what you think.

Thanks Matt
Sean