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Old 03-01-2006, 11:09   #1
Spartan
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Wren MW54 Mk3 Kit Assembly

I have always been intrigued as to what goes inside a model turbine, and amazed by those Guys that build them from scratch.

Wren Turbines Ltd have been around for quite a few years now, supplying fully built turbines, kits and parts to turbine enthusiasts.

So I treated myself to a Wren kit, the MW54 Mk3 with full auto start and FADEC etc.

Basic spec:
Full auto start, 14lbs thrust turbine @ 160k rpm.

The kit comes with virtually everything. All I have to add for a bench start is a receiver, Rx battery, ECU battery, propane/butane and fuel.

But first I have to assemble this little jewel........................
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Old 03-01-2006, 16:03   #2
MLaCoste
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That's awesome Jules!

Now the only question is........
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Old 03-01-2006, 16:17   #3
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Quote:
Originally Posted by MLaCoste
Now the only question is........
I thought you were gonna ask, "are you ever going to finish it ?"
Of course I will !

I'll post pics in my gallery as I progress, and do a picture journal here.
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Old 03-01-2006, 17:49   #4
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Everything arrived 24 hours after ordering in a compact parcel. I thought there would be another parcel to follow, but Wren managed to fit everything in. All the parts were well bagged, and there was no damage during transit.

So this is what you get in the box...........













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Old 03-01-2006, 17:54   #5
Lt. Dan
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Very nice, Jules. I look forward to seeing your progress on the assembly over the next 5-10 years.
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Old 03-01-2006, 17:58   #6
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Quote:
Originally Posted by Lt. Dan
Very nice, Jules. I look forward to seeing your progress on the asembly over the next 5-10 years.
And I expect to see your spelling improve in the same time frame !
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Old 03-01-2006, 22:11   #7
charlieoneseven
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Back to the turbine for a minute guys. I am considering this unit also the $200 less for the kit is worth the few nights it should take me to put it in working order. I'll keep an eye on your build and hope to see any glitches you may have hit in instructions or parts fit. My last turbine had a seperate oil tank did they do away with that on this engine like so many others have now done using fuel to lubricate?
Thanks, Charlie
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Old 03-01-2006, 22:22   #8
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Hi Charlie,

This turbine, like many today, uses a total loss oil lube system. That is, the oil is mixed into the fuel @ 3 to 5%

I am about 60% through the build already, and busy uploading photos into my gallery. Have a look there for a sneak preview.

So far I have hit ZERO problems.
Everything fits, quality control is good.
It's been a joy to assemble, much the same feeling I get building helis.

Building planes, messing with glue & balsa is another matter.............
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Old 03-01-2006, 23:48   #9
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Damn! Somebody's been busy! Nice looking pics in the gallery...

http://www.rcjet.net/forum/photos/sh...me=999&way=asc

See, now you've made me want to pick up one of them too......

Mark
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Old 03-02-2006, 13:33   #10
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Lubrication tube fitted to diffuser



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Old 03-02-2006, 13:35   #11
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Front cermamic bearing fitted into shaft tunnel, note arrow on bearing.
The front of the shaft tunnel has a pre-load spring, shim and circlip in it.




Last edited by Spartan; 03-02-2006 at 16:07.
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Old 03-02-2006, 13:37   #12
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Shaft tunnel fitted to rear of diffuser



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Old 03-02-2006, 13:39   #13
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Shaft seal located and bolted to shaft tunnel through diffuser





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Old 03-02-2006, 13:43   #14
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Fitting case front on top of diffuser









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Old 03-02-2006, 13:46   #15
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Turbine wheel comes factory fitted and balanced on shaft.

You can see evidence of balancing on the sacrificial rings on the turbine wheel, and on the shaft.





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Old 03-02-2006, 13:53   #16
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Turbine shaft inserted into shaft tunnel.

The front bearing is spring loaded, so the assembly has to be squeezed together before the impeller can be slid on and front nut screwed on.

THE FRONT NUT HAS A LEFT HAND THREAD !
Took me ages to get it started.............








Last edited by Spartan; 03-02-2006 at 16:08.
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Old 03-02-2006, 15:16   #17
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Fitting the intake cone









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Old 03-02-2006, 15:21   #18
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Aligning case front, so that compressor is central to inlet cone.

Note small gap between green blade and side wall.





Rotated housing, now we have a big gap between green blade and side wall. It's not running true, must be corrected.



Get a "feel" for the size of the problem



Cut some shims out of shim sheet



Take up the slack to centralise the compressor wheel in the intake housing

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Old 03-02-2006, 15:24   #19
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Getting the combustion chamber ready for mounting



Look at those weird combustion tubes for the injectors



Injector detail



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Old 03-02-2006, 15:29   #20
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Lightly crimp on spacers so they don't fall off








Fixing combustion chamber to front assembly

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Old 03-02-2006, 15:32   #21
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Attaching service (fuel, lube & gas) standoffs




Slipping on front "O" ring

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Old 03-02-2006, 15:34   #22
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Fitting NGV to rear of combustion chamber



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Old 03-02-2006, 15:35   #23
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Fitting the outer case







There are various holes to line up, including glow plug, front case and NGV








Last edited by Spartan; 03-02-2006 at 15:37.
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Old 03-02-2006, 15:44   #24
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Standard glow plug



Tease the coils out



Use an old glow plug to chase the thread out





Glow plug fitted, WITHOUT copper washer

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Old 03-02-2006, 15:47   #25
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Festo fittings for fuel, lube and gas.
Fuel goes into the "T", and out to the lube input via a restrictor
Gas into the other Festo

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