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Wren Turbo prop

Old 04-13-2013, 01:32 AM
  #1  
Justflying1
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Default Wren Turbo prop

Hello,
I have been looking at this engine for my Yak-54 conversion.
Can someone give me some light about the turbo props.
I have heard lots of good things about theturbines but I have heard they where having problems with the turboprops.
Question is
1- Does the problem still exist?
2- What was the problem?
3- Have they got good customer service? By this I mean not just sales but AFTER SALES SERVICE.
If I did go with this turbine has anyone got any suggestions on Prop size and brand for a 100cc Extreme composite Yak-54.
Thank you
Ivan
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Old 04-13-2013, 06:59 AM
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kev-o
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Default RE: Wren Turbo prop

A buddy of mine has the 54 version there after sales service is great, and older issues seem to have been ironed out. I'm building a turbo raven for a customer nd we are going to start with I believe a 28/10 two blade and go from there and probably try some 3 blades as well. Granted this will have the jetcat unit in it , but power should be similar between the two. Beware of nosing it over that's a gauranteed trip back to wren for gearbox service. That is why many build trikes like he tucanno.

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Old 04-13-2013, 07:11 AM
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Default RE: Wren Turbo prop

WE HAVE AN WREN 54SS, AND, WHEN I NEEDED SERVICE AND SPARE PARTS, I CALL RON BALLARD ( USA ) AND, WREN UK, EVERY TIME THE GUYS HELP ME VERY FAST, BY MAIL AND PHONE.
WREN PRODUCTS ARE GREAT, DONT WORRY ABOUT SERVICE, PARTS AND PRODUCTS, WITH THESE GUYS YOU HAVE THE BEST!!!!!!!!!!!!!!!!!!

JOSE
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Old 04-13-2013, 07:30 AM
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Wayne22
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Default RE: Wren Turbo prop

Service is excellent - period!!

the 44 will be a bit small for a 100cc plane. I don't know know what the thrust rating on the 44TP is, but the larger MW54 turbo prop was good for about 65 lbs of thrust which was roughly the same as an 85cc gasser.

Propellor selection is critical. Too large a prop will load the turbine engine and increase the exhaust temperature very rapidly.....

They are interesting machines and a lot more efficient in producing power that the reaction turbines that most of us love...
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Old 04-13-2013, 12:24 PM
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Justflying1
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Default RE: Wren Turbo prop

Hello everyone,
Thank you for the information so far.
The Wren 54 turbo prop is no longer in production. This will rule it out.
I have however got some information from the Wren web site and manual.
I guess my main worry will be vertical performance.
Being an aerobatic plane this is very important to me and I do like my 3D flying, so being able to sit it on its tail is necessary.

Max Power Output:7.5HP / 5.6Kw @ 195,000 rpm
Weight:1750gms / 3Lbs 13oz
Overall size centre section:326mm x 86mm / 12.8" x 3.4"
Mounting:Hole dia 85mm / 3.4", 6 x M3 screws
Ancillaries weight (inc battery):340g / 12oz
Propeller rpm range:1100 to 9000 rpm
Propeller size range:17 x 12 ~ 28 x 10 (2 or 3 blade)
Recommended Setup:6400 rpm on Metz 22x13 3-blade prop
Fuel Consumption @ max power:176ml per minute / 5.8oz per minute

The Wren 44 TurboProp is the worlds smallest commercial 2-shaft turbo-prop engine. It is
designed for use in miniature aircraft applications in place of an I/C engine. It is generally suited
to aircraft up to 25kg (55lb) in all up weight and will replace I/C engines of around 80cc (4.8cu
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Old 04-13-2013, 06:34 PM
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Aussie Bart
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Default RE: Wren Turbo prop

Ivan

You may remember that I have the Jetcat SPT5 in my Tucano fitted with a 24 x 14 3 blade and it does a nice job of pulling it around. There is a guy ay=t the Bairnsdale club who put the 44 TP in his little Porter and it really did not show alot of power, it flew it ok but no authority. If you plan on the 100 size Yak or similar you will need the SPT5 or similar size to make it fly. I will talk to you at Wang about it if you want.
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Old 04-13-2013, 09:24 PM
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Justflying1
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Default RE: Wren Turbo prop

Thanks for the info Bart i will talk at Wang Jet meet.
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Old 04-13-2013, 10:11 PM
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PaulD
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Default RE: Wren Turbo prop

For the size of airframe u are looking at, suspect you will want more power. Also to consider is these engines do not 3D well. They don't have the throttle response you need to keep things balanced in the hover.

PaulD

ORIGINAL: Justflying1

Hello everyone,
Thank you for the information so far.
The Wren 54 turbo prop is no longer in production. This will rule it out.
I have however got some information from the Wren web site and manual.
I guess my main worry will be vertical performance.
Being an aerobatic plane this is very important to me and I do like my 3D flying, so being able to sit it on its tail is necessary.

Max Power Output : 7.5HP / 5.6Kw @ 195,000 rpm
Weight : 1750gms / 3Lbs 13oz
Overall size centre section : 326mm x 86mm / 12.8'' x 3.4''
Mounting : Hole dia 85mm / 3.4'', 6 x M3 screws
Ancillaries weight (inc battery) : 340g / 12oz
Propeller rpm range : 1100 to 9000 rpm
Propeller size range : 17 x 12 ~ 28 x 10 (2 or 3 blade)
Recommended Setup : 6400 rpm on Metz 22x13 3-blade prop
Fuel Consumption @ max power : 176ml per minute / 5.8oz per minute

The Wren 44 TurboProp is the worlds smallest commercial 2-shaft turbo-prop engine. It is
designed for use in miniature aircraft applications in place of an I/C engine. It is generally suited
to aircraft up to 25kg (55lb) in all up weight and will replace I/C engines of around 80cc (4.8cu
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Old 04-13-2013, 10:33 PM
  #9  
Justflying1
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Default RE: Wren Turbo prop

Thanks for the advise Paul.
I obviously have to look at a more powerful turbine.
Turbines do hover well its just a different entry to what you usually do with your piston prop plane.
With a piston engine you can be more aggressive with the throttle and you will have power at an instant.
You can come in low pull hard on the rudder, pump the throttle and work it. The plane will sit there and hover.
With a turbine you will have to gradually put it in a Hover and find the sweat spot on the throttle. Everything has to done a little smoother and be very careful when close to the ground as the throttle response is not as quick.
Just as an example you cant expect a thrust vector Jet or turbo prop to take off and put it straight into a hover. This does not mean however that you cant hover it.
Just my 2 cent worth.
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