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HelicopterTurbine Helicopters › Jakadofsky PJ-W losing power on Vario Lama
09-11-2011 12:39 PM  5 years agoPost 1
JOJO HELIS

Heliman

malta (Europe)

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Hi all,

I have experienced an uncomfortable feeling today when flying my Vario Lama turbine helicopter. This model has 19 hours of flying time, and to date, the engine never gave me any problems.

However, today (after a few months of not flying it) I experienced a symptom which scared me!

After a few minutes hovering, the engine sounded and also felt like going down in revs for a very short while making also the tail to wag!

I immediately landed the helicopter to check if anything obvious can be noticed, but to no avail. I started the heli again, and very cautiously hovered to see if the engine does it (lose power) again, and unfortunately it did it again.

The EMT reading is 521 degC and the EAT is 417 DegC. I was a bit nervous, and did not take the readings when I landed immediately.

In the meantime I shall try the helicopter with fresh fuel and see whether the problem persists. Any guidelines what to look for would be appreciated.

Please note that I did not do any changes in the helicopter or radio since it flew well last time I flew it, which is about 4 months ago..

Thanks in advance

Jojo Bonett
Malta

Jojo Helis

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09-11-2011 01:28 PM  5 years agoPost 2
Havoc

Elite Veteran

Ky.

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I would check the header tank, clunk, and filter.

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09-11-2011 02:09 PM  5 years agoPost 3
munkey nuts

Senior Heliman

wales uk

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yep
had the same symptoms on my wren, it was the filter

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09-11-2011 02:53 PM  5 years agoPost 4
JOJO HELIS

Heliman

malta (Europe)

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Thanks Guys,

I did look at the filter, however I think I shall replace it anyway and see how it goes.

shall post again when tested.

Regards

Jojo Bonett

Jojo Helis

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09-11-2011 03:06 PM  5 years agoPost 5
Richard

Veteran

Scottish Borders, U.K.

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I had a similar problem with my Jetcat and it was the fuel pump on its way out! replaced under warranty.

Oh **** ! this is going to be expensive?

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09-11-2011 07:34 PM  5 years agoPost 6
modtron

Key Veteran

Oxford. UK

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I would agree with Richard - check the pump !

modtron
Oxford UK

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09-11-2011 08:55 PM  5 years agoPost 7
JOJO HELIS

Heliman

malta (Europe)

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Thanks for the tip Modron,

The pump is an "ORBIT TURBOJET FP280" (Max 6v/6 Bar/500ml).Any idea where I can purchase one of these? as I think that I shall be needing to place an order for one tomorrow after I test fly the helicopter to see whether it was the clunk felt and filter or not.

I had this kit for 4 years, but only did 19 hours, do you think I can claim a warranty with Jakadofsky??

Thanks

Jojo

Jojo Helis

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09-11-2011 09:03 PM  5 years agoPost 8
munkey nuts

Senior Heliman

wales uk

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i didnt think the jetcat pumps were covered under warranty?

gaz

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09-11-2011 09:22 PM  5 years agoPost 9
modtron

Key Veteran

Oxford. UK

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It's not a JetCat engine but Jakadofsky.

I have had one where the pump was full of rust after only 4 runs !

Peter Jakadofsky told me where to send it to get fixed / replaced - a company called Hausel in Austria ?

http://www.modelltechnik.at/

The pumps and valves are not made by our turbine manufactures, so any defects are out of their control.

modtron
Oxford UK

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09-11-2011 10:22 PM  5 years agoPost 10
windy62

Senior Heliman

USA

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The pumps and valves are not made by our turbine manufactures, so any defects are out of their control.
Maybe true, but if they're supplied with the engine, The engine manufacturer should replace the component, then they send it back to the manufacturer.

windy62

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09-11-2011 10:51 PM  5 years agoPost 11
Richard

Veteran

Scottish Borders, U.K.

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When I had the turbine rpm problem, I downloaded the ECU data and sent the file to Roman. I received a reply the same day stating my pump was faulty and a replacement would be sent out which I received within a week. Great service from Jetcat.

Oh **** ! this is going to be expensive?

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09-26-2011 05:02 PM  5 years agoPost 12
JOJO HELIS

Heliman

malta (Europe)

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Ok Guys, its time to confirm the end of this saga. THE PUMP.
Peter Jakadofsky replied to me the following:
"three possibilities:
fuel system (sucking in air bubbles from what reason ever....)

rpm measuring(check if the infrared diodes are glued in correctly into the aluminum intake and not loose, rpm wiring to the AECU ok)

most likely: Bad fuel pump(corrosion inside the fuel pump and/or worn brushes) the fuel pump cannot be disassembled or the motor changed, everything is glued together "

Must also mention how prompt Peter's service was.

So after checking the first two suggestions, it resulted that it was the pump after all. At least the symptoms were kind enough with me to notice the problem while my model was still in one piece.

Jojo

Jojo Helis

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