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HelicopterTurbine Helicopters › acrobat conversion sph5 gearbox
09-01-2009 11:15 PM  8 years agoPost 1
munkey nuts

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as you can tell from the video, something is not right.

i was flying on sunday, there was a ratchet like sound so i landed and the gear box was jammed then free then jamming.

ive noticed that the belt has gone slack and lost its tension and the shaft from the gear box moves side to side.

is this the bearings that have gone or something else inside the gear box?

is it a trip to germany to repair or is it not?

http://www.youtube.com/watch?v=QyyeF0_X4P4

thanks gaz

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09-01-2009 11:37 PM  8 years agoPost 2
Bell Bloke

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I'm afraid it's Gearbox Failiure, How many hours on it? Was it getting lube?
I think Matt had the same problem with his SPH5 after a few hours. He sent it back to Germany and it was upgraded.

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09-02-2009 11:42 PM  8 years agoPost 3
munkey nuts

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its on 50h now.

it is the same one matt had. i think it was on about 25 h when i had from him. not sure at what hours he had the gear box done. but it doesnt seem to have done many hours to me.

when i landed it i checked there was oil going to the gearbox and it seemed fine.

gaz

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09-03-2009 12:09 AM  8 years agoPost 4
Bell Bloke

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Gearbox should last for at least 120hours. My Wren old style gearbox was showing tiny signs of wear at 140hours but was still fine. However when I asked Wren the question about how much longer I could expect it to last they offered me the oil fed version with the really big bearings in as an upgrade so I still have no idea just how long the second stage will actually last. My best conservative guess would be 150-160hours (it doesn't run the same shaft speeds as the gas gen)

Anyway this isn't helping you other than you can say to JetCat that you would expect to get 100+ hours out of it, which would be true.

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09-03-2009 11:55 AM  8 years agoPost 5
PETER ROB

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Devon UK

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Gareth,Before sending it back to JetCat, it May be worth having the lid off and seeing what has happened
If it is only the output bearing it would be possible to change that yourself, if it is the ceramic input then it's back to Germany
The life of a gearbox is until it goes wrong, who can tell what life it has had, or who has been messing with it
Peter R

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09-03-2009 06:45 PM  8 years agoPost 6
munkey nuts

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peter
would my warranty be still valid if i was to remove the bottom cover.
is there any kind of seal inside or is it unscrew, new bearing then screw back on.

thanks

gaz

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09-03-2009 07:30 PM  8 years agoPost 7
tdo

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Germany

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From the rattling noise I'd tend to say it's a faulty bearing.
Yes, it could be, that changing that particular bearing would do the job, but, depending on the type of damage, it could well be, that
some parts from the bearing made their way into the turbine.
So disassembly and careful inspection aside from "only" changing the failed part would be highly advised.

If I noticed similar events on my nitro engines, I'm not (yet) in the turbine league, I'd had no issues to take the whole engine apart,
'cause it only contains a few parts, easily to disassemble and assemble again.
But a turbine is a different beast, from complexity and price point of view.
Do yourself a favour and send it to professional service.
I think it's worth the money.

Thilo

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09-03-2009 10:32 PM  8 years agoPost 8
munkey nuts

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i understand what your saying, but the bbearing is in the gearbox on the 2nd stage and is not really part of the turbine. i dont know but would imagine it is a seperate part to the 2nd stage.

if jet cat had a good service/ repair reputation i would send it back, but i think if i was to send it i may not get it back for a long while.

im not saying anything is wrong with there service and repair job, they do that well. its the time issue.

gaz

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09-04-2009 08:15 AM  8 years agoPost 9
PETER ROB

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Devon UK

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JetCat gearbox service

Gareth,Not sure about the warrenty question,Matt was the last one I know who "looked" inside that gearbox
If you contact JetCat they will give you the service history of that SPH5, as I sent it back for any service work/repairs
I take it for granted that if you do decide to have a look, you will clean and flush any debris out, before re-assembly
Peter R

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09-04-2009 11:53 AM  8 years agoPost 10
Bell Bloke

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UK

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munkey nuts, I forgot it was Matts heli. That's the one that he sent back to JetCat 35hours ago I think. I would just send it back or they might try and wriggle out of their obligation to you. Just a thought.

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09-04-2009 07:10 PM  8 years agoPost 11
Bhavik

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London

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Munkey nuts,
Is the output shaft from the gearbox supported at the top?
Regardless at how tight the belt tension may have been set, under load a belt drive is going to place an excessive load perpendicular to the gearbox output shaft and hence on the gearbox top bearing. This radial load could thus be alleviated to a certain extent from that gearbox bearing by incorporating an additional bearing support in your mechanics that supports the end of the output shaft. For this purpose JetCat supplies the gearbox output shafts with 6mm ground ends.

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09-04-2009 07:25 PM  8 years agoPost 12
munkey nuts

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wales uk

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hadnt really thought about an extra bearing at the bottom.

jetcat dont recommend a bearing as far as im aware so what they provide should be sufficient. i would have thought.
my concern is only about the return date if i send it.
anyone have an idea of the turn around time at the moment?

gaz

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09-04-2009 08:32 PM  8 years agoPost 13
Bhavik

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If you take a look at the JetCat designed mechanics for the SPH5 - you will find the top bearing support, the same holds true for the vario mechanics that utilise this engine as well. JetCat cannot supply that bearing, it has to be designed into the actual application i.e. your Acrobat mechanics.

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09-04-2009 08:33 PM  8 years agoPost 14
modtron

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Oxford. UK

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Monkey Nuts,

If you wanted to arrange with Max at JetCat for the engine to go back, I can take it if you like, when I see them in 2 weeks time at Jet Power show in Germany and give it to them personally.

You will then know that they have it and save some time at least.

Open offer if you want to.

PM me if you want to go further with this ?

I'm already going with other engines for repair from other flyers.

modtron
Oxford UK

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09-05-2009 03:41 AM  8 years agoPost 15
Bell Bloke

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UK

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That's a cool offer munkey nuts, saves a bit of cash and piece of mind.

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