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Old 03-17-2008, 10:53 PM   #1
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Blown away !!

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I was asked to help out a local technical school with a turboprop project they are working on. It took 2 seesions to explain how it worked, inspect and make a few alterations to the installation, and brief them on safety procedures. By late this afternoon we were ready to do a test run. After a few false starts due a wiring issue, we had ignition, and it settled down to a nice idle of 45K. We let it stabilze there and did a check of the plumbing for leaks and bubbles. It was turning a 24 x 10 prop and was throwing a fair breeze mixed in with the exhaust.... Then we went for a full throttle run...


The prop rpm jumped up to an incredible level (actually it was only 8000 rpm or so) but the prop blast was fantastic!! We got a brief reading of 35 lbs of thrust (the prop was shrouded with a fan cage, and the gas generator was not quite at full RPM. - this engine can put out 50 lbs of thrust!!)

It was surprisingly quiet - especially for the power it was putting out. Most of the noise was from the air rushing past the cage around the prop....

I notice that Wren have done a lot of work on the core engine. It ignites within a second or two of the start sequence and is at idle a lot faster than my old MkII (which I thought was pretty fast and easy to start)
There aren't enough days in the weekend. -- Steven Wright

Last edited by Wayne22; 09-15-2008 at 06:04 PM.
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Old 03-18-2008, 04:50 AM   #2
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That's what they do, Wayne! We have to tie down the turbine test stands because when you start to use the power, there's a LOT of it. And yes, the turboprops are very quiet - they purr rather than roar like a jet.

I'm delighted to see that the engine is now in use. We have sold engines to colleges and universities all over the world, many of the next generation of aeronautical engineers are being brought up on Wrens!

Sara Parish
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Old 03-18-2008, 03:41 PM   #3
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Interresting and exciting , to say the least , very nice project

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Old 03-18-2008, 04:12 PM   #4
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My A10 needs two turbo fans, when is that comming out?
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Old 03-18-2008, 09:23 PM   #5
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Thanks is a pretty interesting project. I must say that it is very refreshing to be working on something where all the plumbing and wiring is out in the open and not buried elbow deep inside a fuselage.....
There aren't enough days in the weekend. -- Steven Wright
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