rstohr

Kasper,

Inspiring flight. Ordered my P300 last week. It's going in a FEJ 1:4.6 F16 - also on order. Now the waiting begins

Carbon-Customs

hehe great, i hope i get my new F16 before you

jetpilot

My Feedback: (48)

UGH!
Scott

Nhalyn

Very cool in flight !

Seem really a beast for scale flight, with a lot of power (means "torque") at low rpm thus becoming a beast when pushing full power and stick back for a vertical after low/slow pass !

Not an engine for speed records breakers, but sure a beast for scalish flyers !!! Want to one in the big Rafale from AD Jets !!! [>:][>:][>:][>:][>:][>:]

FalconWings

My Feedback: (57)

beg to differ...............25 lb airframe...........20 lb engine

[youtube]http://www.youtube.com/watch?v=JVx9yhez06c&list=UUEXP5kxV10VPR8GAN7JujQQ&index=4[/youtube]

FalconWings

My Feedback: (57)

BTW, I wouldn't fly a large FEJ F-16 like this.....trust me I don't think it would take it.

jetpilot

My Feedback: (48)

I would never go near a FEJ with a P300!
Scott

Carbon-Customs

well it takes it just fine... as you see..

what is the great about that video with the "turbine f16"

FalconWings

My Feedback: (57)

Very, very, tight turns at WOT with opossing rolls. First turn I pulled so hard it stalled on my for a second...but quickly recovered. Not saying it is a difficult manouver to do, nor am I claiming I'm a demo jockey, but it stresses the crap out of your wings and stabs. Trust me, don't do it without mods on yours, specially when I see you fly at 200mph for no reason. The F-16 is not a fast R/C model no matter the size. You can get it to go fast, but just like the real one at low level.......it is not necessarily happy there.

I've had other brands bend wing spars permanently, but at least at this size they don't tend to break.

But go ahead, fly yours the way you do with a P-300! Pull hard on it like I do on my little one. These FEJ airframes are designed to take it.

heraldoboldrin

I also order a P300 for my Tomahawk Hawk...

Carbon-Customs

i think it get pretty stressed on its maiden flight

jetcat p160se

[youtube]http://www.youtube.com/watch?v=TN82zx6NbIo[/youtube]

Taman

your a lucky man, that looks like a lot of fun!

basimpsn

My Feedback: (5)

Very nice flight love your vertical on take off and slow flight love it. good engine combination

Carbon-Customs

now i have the files from the ECU out.

here is some pictures.. the failiure the ECU said was LOW RPM, and this shows it had no low rpm... any experts?

if someone wants the complete textfile please PM me

Aussie Bart

Kasper

Line 152 & 153 shows an increase in RPM demand and a corresponding increase in pump voltage but actual RPM does not follow so ECU shuts down and calls it Low RPM. This is normally caused by an air pocket or disruption in the fuel flow

heraldoboldrin

Kasper... how is going the P300? mine is arriving...

DiscoWings

My Feedback: (76)

What solenoids where you using? I had a problem with my 240 doing something similiar and the problem was traced to the solenoid not allowing enough fuel flow, the replaced it by going to the original style solenoid instead of the purple one.

ALSO what is your pump voltage?

Craig B.

Shane (Bart) is right on here. I would be watching that filter very closely for signs of cavitation in the fuel (read, I would get rid of it)

schroedm

My Feedback: (1)

Kasper,

I assume you are running your entire fuel system (except where 4mm festo tubing is required) nwith the largest bore tygon etc? Including all vents??

What air trap are you using?

Rgds,
Mark

smaze17

My Feedback: (60)

Wow!

A thing of beauty it is

S

Carbon-Customs

Hey again...

IGot the engine back from jetcat very fast. New fuel pump

BUt in first flight i had another engine stop. Low rpm..

Had 3 flights after that with no trouble. But at one takeoff verticao it sounded like a compressor stall



I have a total of 5 tanks incl the æargest cat 260 and all fittings are largee than 6mm festo tubeing...

Have stress tested the system with 1500ml a min with no cavitation

BUt both engine stops where at half power

Jack Diaz

My Feedback: (1)

Kasper, it is a typical flame out that occurs when you are at full power .... chop the power close to idle .... and immediately apply power again.
You went from 100% to 30% to 50% very quickly.

Same things have happened to me so many many times, that I have come up with a theory (the only one I can think of ).

It goes like this:

-When you are at full power, all the fuel system is under very heavy suction. Atmospheric pressure is trying to compress and therefore deform every non rigid component on the fuel system (hoses, UAT, tanks).
-When you abruptly cut the power, the pump voltage suddenly drops (from 5.4 to 1 volt in your data; in no time)
-Not been suctioned now by the pump, the fuel system immediately begins to expand to its natural shape. This expansion creates a negative pressure in the system .. and on the pump, which is now at idle.
-When you reaply power (from 30 to 50%, again in almost no time) the ECU increases the pump voltage "at a rate in accordance to the learnt parameters".
But, those parameters were not learnt under such negative pressure on the pump inlet. And were not learnt with ram air pressure in idle. So, the fuel inyected is below the required stoichiometric fuel/air ratio, and therefore the flame goes out.
-Your pump voltage went from 1.1 to 1.5v, but that was not enough to reach the set RPM. So, it went to 1.9v But it was too late. The ECU realizes a flame out and shuts down.
-In other words, although the increase in pump voltage was correct, it was not the propper voltage needed under the unexpected (for the pump, of course) lower suction pressure, and higher air mass going thru the inlets.

Moral of the story (mine at least):
"Never cut the power close to idle, and then put it back immediately"
"If you need to cut and reaply, like in a regresive or loop, etc., never lower the power below half"

Once again, this has been a recurrent issue for me regardless of the engine or airframe. I think, that the larger the engine is, more chances for this to happen.

It is a theory, but when I apply it, I don't have flame outs. Everytime I forget it, I pay the consequences.

Jack

Carbon-Customs

Maybe i should try operate the throttle like a messerschmitt 262 pilot

Jack Diaz

My Feedback: (1)

That should do it !!!!

One more thought: Larger, more unrestricted tank vent fittings and vent lines, help with this issue.

Jack

gio

My Feedback: (26)

I also had a problem with an engine of mine shutting down on fast deceleration or acelleration.
What I did was dial in some throttle delay in my radio, since then no more shutdowns,and it will not affect throttle response at all.