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HomeTurbine✈️Aircraft🚁HelicopterTurbine Helicopters › Jet Ranger Wren Exhaust
06-03-2011 09:07 AM  9 years ago
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jamesmac

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Edinburgh

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Jet Ranger Wren Exhaust
After several failed attempts at fabricating my own exhaust, I built a jig:

Fabricated a card exhaust / templates:

Checked it all fits:

Sent the jig / card exhaust down to Peter R for fabrication and he made a great job of this tricky job:

Peter R has done a nice bit of work, many thanks!

I will post some more pics of the build of the Jet Ranger, but hope to end up something like this:

James
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06-03-2011 11:39 AM  9 years ago
helibeli

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wales.uk

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How did you configure the Wren engine for top mounting?
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06-03-2011 11:51 AM  9 years ago
FloridaHeli

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jacksonville, florida

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Absolutely fantastic modeling of the exhaust and Peter R did a great job of making it come to life.

Just curious is there any concern that the thrust ejecting from one side of the air frame will push the heli sideways? Hovering could be difficult.

I have no experience with turbines but since jets use turbine exhaust for propulsion wouldn't it do the same when in a heli?
This hobby is WAY too expensive!!
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06-03-2011 12:01 PM  9 years ago
helibeli

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wales.uk

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Twin stage turbines like the Wren don't suffer from thrust issues like the single stage turbines which have lots of thrust and noise.
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06-03-2011 12:07 PM  9 years ago
jamesmac

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Edinburgh

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Most of the energy is used up turning the second stage turbine wheel so very limited thrust comes out the exhaust as Helibeli says.

The Wren is mated to a HobbyParts gearbox, which in turn is fixed to the base plate that has stiffener parts on the underside.

James
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06-03-2011 12:34 PM  9 years ago
FloridaHeli

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jacksonville, florida

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Appreciate the info. Good stuff to know for when I do a turbine heli.

Looking forward to the build photos.
This hobby is WAY too expensive!!
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06-05-2011 05:07 PM  8 years ago
Bell Bloke

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UK

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Very cunning, I like it! The gap in the exhaust joint will also syphon hot air from the cabin. Can't wait to see it
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06-06-2011 10:21 AM  8 years ago
PETER ROB

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Devon UK

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Jet Ranger Wren Exhaust
Thanks for the comments
this exhaust has a story of it's own
I had a call from James, making an enquiry, as to whether I knew of a single out let Wren exhaust, I put him in touch with someone who had a used one, one surplus to his requirements
The next call from James was an enquiry, as to whether I was still making custom exhaust, this established, he said, he had already made, a mock up for his Jet Ranger, I told him to send it down I would see if it was possible
All his cardboard mock up parts arrived, that's when the fun started
It is very easy to make a mockup with damp cardboard it will twist to any shape required a lot easier than flat plate .5mm SS
Also the idea of the air scoop, was discussed, this made all James's cardboard templates redundant, but they had served their purpose,
I next had to make new templates, for the new design, out of thin mdf board, a lot stiffer than cardboard
That was the start of a two day job from concept to finish, personally, I was not happy with the end result, I had to form a twist,within the fabrication, to exit the JetRanger window
The thing that made it a lot easier was the thick, mdf support that James had made,with out it the construction would not have been possible, it acted like a vice to hold the parts in position
I had to finish with some silver solder, to seal the holes from a previous failed extension, and some miniscule holes to make it 100% gas tight
I had told James that this was the first and last Wren exhaust I would make, because, previously, I have only made tubular exhaust's for JetCat and they are infinitly more adjustable
When James received the exhaust and template, he needed to take a file to the exhaust to finish it to the shape of the JetRanger window, but he said he was happy with the finished job, he must have been for he has paid me in full,

Anyone wishing to follow James in scratch build installations, then make a solid jig, it made the whole job easier and faster, for me,and less expensive for James
Peter R

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