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-   -   JetCat Direct Support thread is very unsupportive (https://www.rcuniverse.com/forum/rc-jets-120/11601720-jetcat-direct-support-thread-very-unsupportive.html)

Vettster 07-22-2014 05:47 PM

JetCat Direct Support thread is very unsupportive
 
Cant get ANY help from the Turbine clinic so I will post this here.

I recently changed over to diesel on my P-80se. The power increase was very noticeable! Using a Data Logger I gained 27mph on the top end. However.. with the diesel it seems to pop a small amount at idle and just under half. Above 1/2 throttle its not noticeable at all. When its popping below half throttle there are very small blue flames coming from the tail. I feel that the engine is getting to much fuel at the bottom end.

Is there a way to reduce the fuel flow at the bottom end? This is a GAS start engine.



mr_matt 07-22-2014 05:58 PM

Just my opinion. It is not too much fuel. The fuel it_is_getting is not atomized as well as before. This seems to be a by product of the diesel and is specific to an individual turbine, not a model.

Unless I forgot something, once the turbine is running, it is running closed loop. There are no settings to control the "mixture" as it were. I think there are settings that set how aggressively it accelerates but that does not change the steady state fuel flow mapping. Of course I could be all we

mikes68charger 07-22-2014 06:15 PM


Originally Posted by Vettster (Post 11846462)
Cant get ANY help from the Turbine clinic so I will post this here.

I recently changed over to diesel on my P-80se. The power increase was very noticeable! Using a Data Logger I gained 27mph on the top end. However.. with the diesel it seems to pop a small amount at idle and just under half. Above 1/2 throttle its not noticeable at all. When its popping below half throttle there are very small blue flames coming from the tail. I feel that the engine is getting to much fuel at the bottom end.

Is there a way to reduce the fuel flow at the bottom end? This is a GAS start engine.



I got a p80 that dose the spitting at idle with little blue flames but it goes away once powered up on kero. I have been tempted to go diesel

Jetkopter 07-22-2014 07:05 PM

Its possible you have a fuel needle that is worn or possibly clogged. Did it ever pop on Kero?

Dave Wilshere 07-22-2014 10:34 PM

Its common when swapping to Diesel this happens, the P-80 was designed to run on Kero, since you are at idle for a short period in any run, i'd live with it if you want to run Diesel as a fuel.

Dw

Vettster 07-23-2014 05:55 AM

Thanks for the replies guys! Mr Matt I always appreciate hearing what you have to say. I learn a lot from you ;)

MikeSupercharger... If yours is spitting on Kero I would not recommend that you go to diesel on the THAT engine.. It will only get worse.

Jetcopter.. Thanks for commenting, but the engine is only 8 hrs old and performed flawlessly till I switched to diesel (and still runs great..just a bit rougher on idle ;) )

Dave I agree with you. This is a very minor problem and I'll live with it cause the trade off is WAY more power and fuel that cost less than Half of Kero and is on every corner :) And! Ive also noticed that my fuel consumption has dropped = longer flight times

I wonder what Kingtech has done to perfect this. I have a K100G that performs flawlessly on diesel once you tweek the settings a bit.

Thanks Guys!!!

Pepperpete 07-23-2014 07:50 AM

I also noticed the fuel savings on my K60G Kingtech. So much so that I can change one of my cells into a smoke tank now. And yes it does seem like Kingtech have mastered the fuel swap.

mr_matt 07-23-2014 09:04 AM

I believe Kingtech uses a different style of injector/atomizer, like the old AMTs. Trades off atomization in exchange for less fuel economy.


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