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All Forums >> RC Airplanes >> RC Jets >> Turbine Clinic >> SimJet Turbine Direct Support >> Simjet 3000
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Simjet 3000 - 6/12/2002 8:09:39 PM   
GerhardH



Posts: 39
Joined: 6/9/2002
From: Frankfurt, Germany
Status: offline 		My Simjet 3000 quits when going from full power to idle unless I move the throttle stick back very slowly. I have no bubbles in the fuel system and everything is set up according to manual. The Simjet distributor in my country has sent me 3 different ECU, but still the same thing. Maybe anyone can help me here?

Also, the thrust is only 10 Kg. (22Lbs) it was sold to me as 14 Kg (30 lbs). I was told that this is because of the new quiet tailcone and because my engine was tested at the factory at 2 degree celcius.??? Can anyone explain please

_____________________________

Gerhard Hartmann
       Post #: 1

Shutdown on Throttle Back - 6/12/2002 10:04:34 PM   
rcav8tr


 

Posts: 965
Joined: 12/18/2001
From: Milton, ON, CANADA
Status: offline 		Hi Gerhard

Can you answer some questions for me:
1) What radio are you using?
2) What are your ATV settings?
When you set up the idle point(yellow light), you are setting it up as per the instruction manual?
3) What lights are on/blinking after the shutdown?
4) What is your fuel line/tank plumbing configuration?

This will give me a starting point for diagnosis.

With respect to the lower than rated thrust output. You are not the only one to complain about that issue. Can you please send me your engine serial number and ECU sticker information via Private Message here or to my e-mail address at [email]gnmodels@rogers.com[/email]. We are attempting to determine the cause of the problem and the more information we have, the faster we can isolate and correct the problem.

Sincerely,
Ed

_____________________________

Ed Miedzybrocki - Great Northern Models - 905-320-7979
Dealer for SimJet, Skymaster, BVM, JetCat, Yellow and much more.

(in reply to GerhardH)
       Post #: 2

Simjet - 6/12/2002 10:30:32 PM   
GerhardH



Posts: 39
Joined: 6/9/2002
From: Frankfurt, Germany
Status: offline 		Mr Simjet

I am using the Graupner MC 24 radio. The set-up of the radio, fuel system and turbine installation has been checked again and agan by German Simjet importer. Everything is according to manual. (ATV is 100% high, 120% low, Yellow lights are on when I start and I move the trim up a few clicks as soon as yellow comes on. Fuel system is maintank and hoppertank with the special clunk Simjet includes to kill bubbles)
I have after posting this here on RC Universe received several e-mails from Simjet pilots who have the same problems. Some suggest usin the Orbit ECU instead as it seems to be working with the Simjet engines. Have you any experience with using a better ECU?

Regardin the thrust i think Simjet should refund the money to their customers. I have tried to talk to the factory about this, but they say that it is normal for an engine to loose thrust when it is hot. Do you think 8 lbs of lost thrust can be because of hot weather? (Remember that hot here in Germany means maybe 20 degreees centigrade)

My other problem is that the engine will flood with fuel even though the propane has not ignited. So sometimes the plane is filled with fuel inside. This is something I think has to do with the latest ECU I got since it has not happened before. Doo you have a solution to this?

Thanks

_____________________________

Gerhard Hartmann

(in reply to GerhardH)
       Post #: 3

3000 Shutdown on Throttle Back - 6/12/2002 11:47:33 PM   
rcav8tr


 

Posts: 965
Joined: 12/18/2001
From: Milton, ON, CANADA
Status: offline 		Hi Gerhard

When you set up the idle position. Do you follow the following sequence:
1) Throttle stick at idle position, fully down, and throttle kill off.
2) Advance trim so that the yellow light comes on.
3) Continue to advance the trim so that the Yellow light goes out and then bring it back until the yellow light comes back on.

The issue I see is that when you are throttling back, the ECU losses the signal for the receiver long enough to initiate a shutdown by itself. This is generally caused by the throttle trim being too low or the lower ATV position too high.

The other issue may be fuel related, but let's go one step at a time.

With regards to the thrust issue. I can not speak to what SimJet should or will do. All I can do at this point is gather the information and determine where the problem may be. Test the hypothesis, and based upon the findings, suggest a course of action.

When you say the engine and plane are flooded with fuel, do you mean propane or kerosene?

Ed

< Message edited by rcav8tr -- Jun 12 2002 7:03PM >

_____________________________

Ed Miedzybrocki - Great Northern Models - 905-320-7979
Dealer for SimJet, Skymaster, BVM, JetCat, Yellow and much more.

(in reply to GerhardH)
       Post #: 4

3000 problem - 6/13/2002 12:07:35 AM   
GerhardH



Posts: 39
Joined: 6/9/2002
From: Frankfurt, Germany
Status: offline 		Beleive me Ed,

My engine is set up ecxactly like you describe here and like the manual describes. I have sat down with 2 other Simjet owners at a jet meeting last month and we went through the settings. I am sure it is a ECU problem that has not been solved by Simjet. I hate to say it but the Simjet ECU is not a good product. Maybe some Simjet ovners are OK with their ECU, but the general opinion here in Europe is that it is bad electronic thet they deliver. And the problems always seems to be that the Simjet engine flame out. There are not engines that blows up or anything, they just wont run. So it must be the ECU that is no good.

Can you honestly say that you have no ECU problems in America?

If so, maybe I should buy a new ECU the American version to fix some of my problems

Thank you for trying to help

_____________________________

Gerhard Hartmann

(in reply to GerhardH)
       Post #: 5

SimJet 3000 Shutdown - 6/18/2002 8:55:45 PM   
rcav8tr


 

Posts: 965
Joined: 12/18/2001
From: Milton, ON, CANADA
Status: offline 		Hi Gerhard

I believe you when you say that you have followed the manual and it has been checked by others and passed a being correctly setup. But, in order for me to help you, I have to follow a series of questions(diagnostics) to determine what is happening with your engine. Without the feed back, I can't help you, especially since your a few thousand kilometres away.

But, I have reviewed your posts and gleaned the following information:

"(ATV is 100% high, 120% low, Yellow lights are on when I start and I move the trim up a few clicks as soon as yellow comes on. Fuel system is maintank and hoppertank with the special clunk Simjet includes to kill bubbles) "

Two things: A) I think your lower ATV value is too high. When you bring your throttle stick to idle, the ECU may be loosing the throttle signal momentarily as your throttle stick gets to the end stop. This can cause the ECU to initiate an engine shutdown as it thinks that the throttle signal is lost. The ECU will react faster than the failsafe in your radio.
B)You may be setting the idle position incorrectly. When you do the idle position set up, you should be doing the following:
i) Throttle stick and trim in the full down position and any throttle cut switch should be off.
ii) Advance the trim until the yellow light comes on and continue until the yellow light goes out.
iii) Move the trim back until the yellow light comes back on.
iv) Adjust the trim back a click or two more to be certain.

Please try this and let me know what happens.

I can honestly say that we have had some ECU problems in North America. Most have been due to a faulty component or slightly incorrect radio settings. The ECUs here are the same as those in Europe and the rest of the world.

Problem Two:

"My other problem is that the engine will flood with fuel even though the propane has not ignited. So sometimes the plane is filled with fuel inside. This is something I think has to do with the latest ECU I got since it has not happened before."

Does this occur on the first start of the day or on second and subsequent start attempts? When are you turning off the propane during the startup sequence? Which fuel valves do you have and do you have the bypass/prime line connected to anything?

Sincerely,
Ed

_____________________________

Ed Miedzybrocki - Great Northern Models - 905-320-7979
Dealer for SimJet, Skymaster, BVM, JetCat, Yellow and much more.

(in reply to GerhardH)
       Post #: 6

3000 - 6/21/2002 10:48:33 PM   
GerhardH



Posts: 39
Joined: 6/9/2002
From: Frankfurt, Germany
Status: offline 		Ed,

I fixed my problems. Bought a new ECU from Gaspar Espiell and threw out the Simjet one. Now the engine runs great without flameouts and fuel flodding. i can highly recommend this solution. Another big feature is that is alows you to see all kind of read outs on LCD and do adjustments. Something that Simjet has been lacking from the start.
Thanks for trying to help. My only problem now is the Lack of advertised thrust, but the German distributor is trying to help me with that.

_____________________________

Gerhard Hartmann

(in reply to GerhardH)
       Post #: 7

German Distributor - 6/25/2002 10:49:53 PM   
rcav8tr


 

Posts: 965
Joined: 12/18/2001
From: Milton, ON, CANADA
Status: offline 		Hi Gerhard

Who is your distributor?

Ed

_____________________________

Ed Miedzybrocki - Great Northern Models - 905-320-7979
Dealer for SimJet, Skymaster, BVM, JetCat, Yellow and much more.

(in reply to GerhardH)
       Post #: 8

settings - 7/16/2002 2:22:09 AM   
SANTONOMOS



Posts: 53
Joined: 2/14/2002
From: Lakeland, FL, USA
Status: offline 		I fixed my problems. Bought a new ECU from Gaspar Espiell and threw out the Simjet one. Now the engine runs great without flameouts and fuel flodding. i can highly recommend this solution. Another big feature is that is alows you to see all kind of read outs on LCD and do adjustments. Something that Simjet has been lacking from the start.
Thanks for trying to help. My only problem now is the Lack of advertised thrust, but the German distributor is trying to help me with that.



what are your parameters that you used for the ecu inputs I am leaning toward chucking my ecu if I ever get it back from denmark

(in reply to GerhardH)
       Post #: 9

FADEC - 7/16/2002 2:50:27 PM   
cairoman



Posts: 742
Joined: 12/6/2001
From: Nicosia, CYPRUS
Status: offline 		Hi Santos,

How did you do the ECU conversion to the FADEC. I have a semi-auto FADEC leftover after I have converted my TJT3000 to full auto.

In case, any of my Simjet FADECs does not perform up to specs, I would also like to give Gaspar's FADEC a try. I know it works very well, it has done a very good job with my TJT. So, can you please help here?

THNX
Chris

_____________________________

IJMC-Cyprus, JET-TRONICS' REP
WREN'S REP in Cyprus

(in reply to GerhardH)
       Post #: 10

Cairo man - 7/16/2002 4:56:54 PM   
SANTONOMOS



Posts: 53
Joined: 2/14/2002
From: Lakeland, FL, USA
Status: offline 		I am sorry the post that I printed is from the above member GerhardH I was posing the question to him on what parameters did he use to guide him

by the way 150.00 for the water transfers from promark for you jet great deal

(in reply to GerhardH)
       Post #: 11

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