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HomeTurbineAircraftHelicopterTurbine Helicopters › Wren 2nd stage turbine removal
02-26-2016 12:23 AM  28 months agoPost 81
Chris Bergen

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cassopolis, MI USA

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I do remember that Baileys did use grease in their box, basically when things warmed up it "melted", liquified, whatever, and lubed the gears.

Damned if I remember what kind it was though...

Chris D. Bergen

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02-26-2016 12:16 PM  28 months agoPost 82
steph

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Definitely looks like grease to me

The world is round you can run but you will always end up where you started from

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02-26-2016 02:16 PM  28 months agoPost 83
GyroFreak

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Orlando Florida ...28N 81W

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Looks like that gear reduction is about 5:1 (approx. count of the teeth in the pics). Is this correct, and what is the turbine shaft speed at full power ?
Just following this thread with interest.
Paul

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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02-26-2016 03:52 PM  28 months agoPost 84
steph

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Actually not give that much thought the wren Gb is 4.5 to 1 if I remember correctly and I did not count the teeth on the Gb when I had it apart so I suppose i,ll just set up to what ever the speed i require on the head
Turbine second stage is up to 60000 rpm so 4.5 to 1 or 5 to 1 i'll just adjust to suit

The world is round you can run but you will always end up where you started from

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02-26-2016 06:58 PM  28 months agoPost 85
MattJen

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UK

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well it looks ok.

Found some old pictures in a very old thread with the same gear box being used..

There was discussion as to wether it was Baileys or Dick Wallinger old style gear box, the old threads mention the grease but don't mention the name of it.

Matt

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02-26-2016 07:34 PM  28 months agoPost 86
steph

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It all looks good and its back in the predator and test run today seems fine so I will fly tomorrow

I think I initially had grease in the wren gearbox because when I did a oil inspection when I first got the turbine nothing came out of the fill hole
so I proceded to fill with 15ml of oil
This was bad because when I run the turbine I had loads of smk because now I understand it had grease not oil that's why in did not drip out

That's my thoughts anyway
So the question is what grease is it must be a very high temp to be in there

The world is round you can run but you will always end up where you started from

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02-26-2016 07:43 PM  28 months agoPost 87
steph

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Hampshire England

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Would a good quality high melting grease like this one be good enough

MS3 Grease Lithium Based Grease Fortified With Molybdenum Disulphide

The world is round you can run but you will always end up where you started from

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02-26-2016 08:52 PM  28 months agoPost 88
MattJen

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UK

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You wouldn't have grease in a Wren gear box especially the sump system it was Castrol differential EPX 75W-80.. we used.

If you did then it wasn't a Wren gear box.. I confirmed this as I've had 4 phone calls tonight from Wren flyers who've read this thread and who still have the old sump system, and have asked if they should change to grease instead of 15ml oil..
Amazing how many people read these threads.LOL

Anyway
You've got it fixed and your back up in the air which is great news.
good to see another Pred/Wren up and flying..

All The Best

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02-26-2016 11:09 PM  28 months agoPost 89
Chris Bergen

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cassopolis, MI USA

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Frustrating isn't it Matt?

If you have a sump style gearbox or a fuel lubricated gearbox, do NOT put grease in it!!

Chris D. Bergen

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02-27-2016 11:02 AM  28 months agoPost 90
PETER ROB

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Devon UK

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Grease in Bailey box
When Mike Bailey moved to Australia, he authorised HobbyParts to service his box's
HobbyParts is no longer, but the personell are still here
I was with chopper Jockey yesterday, he is servicing a Wren/Bailey/Predetor
I mentioned the grease, and he said he still has some
He also said he would service yours
He also has some HobbyParts set up's available
Peter R

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02-27-2016 12:13 PM  28 months agoPost 91
steph

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Hampshire England

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Peter thanks for that its good to know there is someone that can and will do a service on these gearbox's hopefully this box I have will do a few hours of running before I need to service it.

Chris as frustrating as it may be I was only assuming the Wren gearbox had Grease in it due to the fact after I removed the oil drain plug nothing came out as grease would not but if there had been oil in there it would have
If there was not oil in the box and I filled it with 15ml of oil it should have been ok but it was not as white smoke came from the exhaust
So something must have been in the box and I was assuming it was grease

The world is round you can run but you will always end up where you started from

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02-27-2016 03:10 PM  28 months agoPost 92
MattJen

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UK

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At least now Steph you have a place where you can send it to be serviced and examined if need be. Phil will look after you.
Although the photo above is NOT a predator but looks like an Acrobatic.

I'm interested Steph how you have mounted it into the predator ?
as these boxes in all the configurations except the Midland Lama, I personally have seen have had a belt drive pulley attached to output shaft and were normally inverted for the Vario Acrobatic, The Cuatro and Extreme was also belt driven with turbine right way up but I have never seen a predator with a belt drive system, very interesting configuration, unless you just removed the pulley and added the usual pinion for a direct drive.

Matt

All The Best

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02-27-2016 08:45 PM  28 months agoPost 93
steph

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Hampshire England

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Quote/unless you just removed the pulley and added the usual pinion for a direct drive.

That's correct matt exactly what I did.

I think a predator with a belt configuration would be interesting.
Strangely enough I have a Future SE and I did think about how I would fit it or even if I should

The world is round you can run but you will always end up where you started from

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02-28-2016 11:39 PM  28 months agoPost 94
Chris Bergen

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cassopolis, MI USA

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my comment wasn't at you Steph, only In a general sense of, due to this topic, there are now people out there questioning whether THEY should have grease in their gearbox...

People see something they think is "new" and want to immediately jump on the band wagon for fear of being left behind...

Chris D. Bergen

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02-29-2016 12:13 AM  28 months agoPost 95
PETER ROB

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Devon UK

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People see something they think is "new"
Not being a Wren fan, I have always known fuel lub for my JetCat 2 stage turbines
Never been a problem, never had a lub problem, never had to check levels or to top up
Those with Wren, and changed to fuel lub, again never heard of lub problems
Some times "new" can be an improvement
Peter R

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02-29-2016 04:05 AM  28 months agoPost 96
Chris Bergen

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cassopolis, MI USA

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Sigh...

Agreed. The "new" thing I'm referring to is the grease in gearbox... Not many people around these days that remember that it was done that way once. So it's "new" to them and they wonder if they should have it in their gearbox....

Chris D. Bergen

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02-29-2016 11:13 AM  28 months agoPost 97
steph

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Hampshire England

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I'm still working on my original gearbox its a oil filled box what I want to do is convert it to oil fed
I suppose to be able to do this I will need to remove the seal in the shaft tunnel put some sort of feed to the gearbox
The fuel feed to the shaft tunnel I could use this as it will be no longer needed to feed the shaft tunnel direct as the shaft will get fed from the gearbox feed
Anyone know where to get the turbine wheels from as wren have none

Comments appreciated

The world is round you can run but you will always end up where you started from

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02-29-2016 04:51 PM  28 months agoPost 98
Chris Bergen

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cassopolis, MI USA

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You need a turbine wheel for the Gas Generator or for the Gearbox?

Chris D. Bergen

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02-29-2016 09:29 PM  27 months agoPost 99
steph

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Hampshire England

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For the gearbox

The world is round you can run but you will always end up where you started from

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03-06-2016 06:18 PM  27 months agoPost 100
steph

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Hampshire England

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The predator is now flying but I keep having flame outs going from the hover to full power full power its probably the fuel lines tank or maybe the pump or regulator needs more investigating

The world is round you can run but you will always end up where you started from

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HomeTurbineAircraftHelicopterTurbine Helicopters › Wren 2nd stage turbine removal
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