Hi guys. got any ideas after reading this one. I have a Roo with a RAM 750F that I have 62 flights on with never a seconds trouble. On the last 3 flights just after takeoff and throttling back it quits! It will run a full 100 oz tank dry on the ground but not in the air now for some reason. I have taking out the sulivan filter between the header tank and the pump after the first flameout, as per Kerry Sterner's advice at the Lliberty Bell rally. It really has me puzzled, I get good temps and it will run all day on the ground. It does make a snorting sound if you throttle up fast so that why Kerry suggested I remove the filter as it may have been causing a restiction at full throttle.Thanks, Ron

I'm not an expert, but it sounds like a glogged or deformed injector needle. Could also be a leaking Festo fitting.

What does the Start Box say when you plug it in after the landing? Keep in mind you must keep the RC on until you plug the box in.

Behind the festo fittings inside the compressor cover are tiny o-rings. They may be worn, and leaking.

Pop the cover, and replace the o-rings and see if that helps.

Oh, there is big o-ring sealing the compressor cover to the can, it may be leaking too.

What ECU are you useing??

Dan

Thanks for the advice guys,I'll try all of your suggestions as nopne of my own ideas has solved the problem, Tony, Steve Stricker says Hi. Dan I am using the ED ECU that came with the engine, Rich I'll pull the cover this weekend and see what is what in there.I have been lucky as all of the flameouts have happensd at a full scale airport where I had lots of room to spare. It would have kill the bird had this happened at my club field, now maybe the guys will understand why I don'y fly my jets there.

This is just a shot in the dark----a buddy of mine had the same problem as yours. Just as the aircraft would reach the speed to throttle back, the engine would quit. He checked everything and the culprit turned out to be the fuel line. The fuel had softened the fuel line and made it more flexable. When the airplane (Hot Spot) reached a certain speed (it just happened to be at the same time as the need to throttle back) the fuel line would flex back (at the point where the fuel line exits the fuselage) just enough to pinch off the fuel to the turbine. This could explain why on the ground you can burn 100 ounces and it quits in the air. Like I said---just a shot in the dark.

Let us know what you find. Kevin

Ron,

There were some issues concerning the E.D. ECU several years ago..It had to do with learning the ecu on the ground(full throttle), before flight. This happened to Bob Price in Mississippi years ago with his first Kangaroo.. Rei was there and got involved and the concensus was that the engine overshot the 1700mb, or whatever it was..i forgot.. and if the temp probe was marginal in depth, it would shut down due to over temp.. seemed to happen right after take off at initial throttle reduction. Rei indicated that this had been an issue before in some cases.. Unfortunately, Bob turned off the ecu before we got back to the pitts to read the error message.. There was no evidence of fuel bubbles at all. The engine restarted normal and ran fine after that incident...I'm sure this is a long shot, but I was there and I saw what happened..After that we all started making sure we ran to full throttle static, let the ecu set max mb, watched the egt... Never duplicated flame out on the ground, but it never happened again after that.... Food for thought..



Good Luck,

Keep us posted!!


Dan M.

Ron,

With the old ED ECU and a JR radio (10X) if you throttled back to idle the engine would flameout. What we had to do to fix it was increase the ATV at idle to about 125% then teach the ECU. This seperated the pulse width at idle and a cut by a little larger margin. I could actually be taxiing out, and hold a little back pressure on the stick at idle and flame the engine out. We also had a lot of problems with pumps. The pump would wear in a little and when you pulled back to idle in the landing pattern the engine would flameout.

David Reid

I was there for the Bob Price incident too, Dan, and I thought it was just a simple case of the EGT probe being too far in so that it read an artificially high temp. And on his takeoff, the ECU thought he exceeded the max EGT (850 deg. C, I think) and shut the whole show down. I don't remember the stuff about setting max CP on the ground. I thought it was a simple Price error.

There is no such thing as a "simple Price error"!!! That error is so complex it would let the smoke out of most calculating machines!See you at Waco!!!


TTFN

Danno

I stand corrected. You are correct about the Great Digital One!

Woketman

You better be at the Southwest in Waco. Digital man will have two planes to fly when he gets there. A new T33 and a new Kangaroo.

Should be interesting to say the least.

Thanks everyone for your ideas, I'll keep ya all posted on what I find or what cures the problem.