RCU Forums - Flameout problem

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RE: Flameout problem

Birdman

Question; Are you still inverted when the motor flames? In the original post it states the flame out occurs performing the same manuver in the same place. I would be looking into the pump or the vent system. When inverted and in a high G turn the weight of the fuel changes making the pumping dynamics change. It is possable the fuel pump is marginal and these changes affect the pumps ability to keep up with the fuel demands. Another possabilty is the vent system with the plane inverted affecting the tank pressure and also leading to pumping issues.

Jerry

RE: Flameout problem

in regards to the onboard filters...........like some of the others here, i filter my fuel before going into the fuel container, it has a filtered clunk, it has an automotive filter between the clunk and the pump and it also has a Dubro filter after the pump, i do not draw fuel back out of the plane with this setup so I've eliminated any possibility of debris getting in the fuel system.........................i also use the JetCat filter onboard between the pump and solenoid. i download the ECU to my laptop after every run and i keep track of the maximum fuel pump voltage and when it creeps up to 0.2 volts higher then average i clean the filter and it brings the voltage back to normal values, as the fuel pump brakes in and wears the onboard filter keeps all those fine particles out of the solenoid and the engine.

RE: Flameout problem

hmmmmmmm

...where is your final vent looking out from the fuselage? forward? aft? down?

RE: Flameout problem

Don't totally disregard the possibility of PCM lockout that will also kill the turbine. There might be an antenna issue. Just needed to throw a spanner in the works!:D:D

RE: Flameout problem

Quote:

ORIGINAL: strawboss

try another UAT, go out and re-test. We have had a bad UAT that actually got transferred from one plane to another and brought along all the same problems. When the UAT was replaced, everything went back to normal.
If that doesnt work, pull out that engine and install a JetCat:D

I second that!!!![X(]:D

RE: Flameout problem

Quote:

ORIGINAL: seanreit

You guys must be better pilots then me, when my engine quits while I'm flying the following is NOT what takes place:

Sean: Gee, engine shut down, [sm=72_72.gif] See any smoke trail?
Spotter: Um, that's a negative, see if you can bring it around before you touch down, maybe waggle the wings a little.

It's more like:
Sean: LANDING!! (Ass clenches to a micron) [sm=drowning.gif]
Spotter: Dude, your engine quit. [sm=what_smile.gif] Did you do that? Or was it the plane?

You forgot:

Sean: LANDING!! ( shorts vacuum into the now active worm hole)
Spotter: Dude, is that normal??? ... Stop #$cking around.

:D

Luis

RE: Flameout problem

haha, happy turkey day bud!

RE: Flameout problem

Sean, you're funny man but I still like mine filtered specially the cold ones :D :D.

RE: Flameout problem

Yes, I guest that I'm a filtermaniac :eek: [sm=spinnyeyes.gif][sm=confused_smile.gif], I too filter my fuel at the pick up line, after the pump with a car filter, UAT and after the pump so that's 4 times ( the Roo had a 5th filter by the engine :) ) can't help it.

RE: Flameout problem

Use the 6 mm Festo filter and you do not have to worry about bubbles. It will always have an air bubble in it, but I can NEVER get it to come out under ANY conditions. Orientation is completly not important. It just works and works well.

RE: Flameout problem

Just wanted to say that I haven't totally cured the problem yet but that's because I haven't had any time to look at it today. Jet Central have been in email contact and offered lots of support and solutions. I still suspect the problem may be a battery problem but I need some time to get back to the field and do more testing - I remember the good old days of having a back garden in the UK to do that, now I live in a shoe box in Manhatten with no outside to test in!

RE: Flameout problem

Thank you for the up date, please keep us posted as we wander :eek: if we have nail the problem right on the head.

RE: Flameout problem

Some good news and bad news!

The good news is I went to the field and after some changes ran the turbine with no problems. I tried some things out in stages - after initially posting I went to the field, removed the filter and did some more running. The problem had got worse and I had flameouts on the ground. I then took it home replaced the battery for the turbine, re soldered various power supply connections and made sure all plumbing and wiring was totally secure. Went to the field today and it ran great but only had one flight.

Unfortunately during this flight I had an undercarriage problem. For those of you who don't know the Bandit ARF, there is a door that comes up to cover the nose leg after retraction. The door was staying open after the gear was up. I tried a couple of manoeuvres to encourage it shut but it wouldn't go, so I tried to cycle the U/C. It partially dropped 1 leg and wouldn't do anymore.

I fly at Floyd Bennet field in NY with nothing but concrete so basically had to land with 1 leg slightly down on the hard stuff. Lukily damage is very minor, with scratching to the underside of the fus and horizontal stabs and nothing more. Wings are untouched. Managed to take the speed right off and get the flaps back up just as it touched down so they were not damaged.
After testing on the ground it looks like when the nose door did not close the ram was trying to pull it shut and leaking air. The system had good pressure before takeoff which had been checked on the gauge.