Wren Turbines USA Go here to discuss with Ron Ballard, of Wren Turbines USA all your questions and comments.

Wren 54 catastrophic failure

Reply
Old 04-05-2010, 07:14 AM
  #1
Xairflyer
Thread Starter
 
Xairflyer's Avatar
 
Join Date: Dec 2002
Location: Co. Donegal, IRELAND
Posts: 2,744
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Wren 54 catastrophic failure

Had a couple of flights yesterday with my Wren 54 Mk2.5 powered Boomerang and on the third flight just after takeoff at about 100ft there were sparks out the back and a bang.

I got her landed ok and when looking at it passing me by, I seen some flames so had to give it a blast with the fire extinguisher when landed luckily no airframe damage other than a bit of black burning, heat resist paint worked !

First inspections showed the tailcone twisted out of shape and the turbine wheel missing blades.

When I stripped it, I discover that the collar on the NGV end of the shaft tunnel and broken off, I had though it may have been a bearing failure but the bearing was still intake as can be seen in the picture of the shaft and turbine wheel. The broken off collar can be seen still on the shaft behind the bearing.

Damage, shaft tunnel, bearings, turbine wheel, NGV, compressor wheel, intake, tailcone, EGT probe will email wren to see what it will cost to fix, might not be worth it.
Anyone got and spares lying about ?
Attached Thumbnails
Click image for larger version

Name:	Jh14492.jpg
Views:	93
Size:	70.0 KB
ID:	1412213   Click image for larger version

Name:	Ez81394.jpg
Views:	97
Size:	67.6 KB
ID:	1412214   Click image for larger version

Name:	Yd82574.jpg
Views:	153
Size:	85.3 KB
ID:	1412215   Click image for larger version

Name:	Xr46359.jpg
Views:	98
Size:	67.8 KB
ID:	1412216   Click image for larger version

Name:	Fq88704.jpg
Views:	109
Size:	43.7 KB
ID:	1412217  

Click image for larger version

Name:	Hy33286.jpg
Views:	122
Size:	61.3 KB
ID:	1412218   Click image for larger version

Name:	Su37312.jpg
Views:	76
Size:	63.5 KB
ID:	1412219   Click image for larger version

Name:	Vu69573.jpg
Views:	124
Size:	74.3 KB
ID:	1412220   Click image for larger version

Name:	Rp14525.jpg
Views:	101
Size:	75.3 KB
ID:	1412221  
Xairflyer is offline  
Reply With Quote
Old 04-05-2010, 08:30 AM
  #2
Turbotronic
 
Join Date: Aug 2009
Location: Cape Town, SOUTH AFRICA
Posts: 456
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Wren 54 catastrophic failure

Seems the collar fracture is typical metal fatique introduced by the very sharp machined edge for the oring slot. Could do with a radiused tool in that machine operation. Basic engineering really. Much like the DH Comet windows...
Andre Baird
Turbotronic is offline  
Reply With Quote
Old 04-06-2010, 11:57 AM
  #3
snatch-it
 
Join Date: Nov 2009
Location: red rose country, UNITED KINGDOM
Posts: 166
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Wren 54 catastrophic failure

hi,
i had a mk3 54 that did that aswell, mine went while i was maidening my t45.
was doing a fast lowish pass when it went, managed to get in down in 1 piece though.
it had about 7.5 hours running on the clock, when i sent it back for repair it came out as an unecononical repair,
found out that the turbine wheels have been changed slightly to stop the blades from flexing and breaking.
needless to say wren did me a real good deal on a super sport, i still have wrens, at the moment ive got a 44 in a amd hawk.
a new 70 in a rafale and the super sport is now on a trusty kangaroo! also owned a few tha ive sold with models,
im sure they will be able to fix her up again, by the way the new wheels have wren wren on them, not wren 54,

hopes this easies the pain,

cheers
snatch

snatch-it is offline  
Reply With Quote
Old 04-06-2010, 12:25 PM
  #4
Xairflyer
Thread Starter
 
Xairflyer's Avatar
 
Join Date: Dec 2002
Location: Co. Donegal, IRELAND
Posts: 2,744
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Wren 54 catastrophic failure


Quote:
ORIGINAL: snatch-it

hi,
i had a mk3 54 that did that aswell, mine went while i was maidening my t45.
was doing a fast lowish pass when it went, managed to get in down in 1 piece though.
it had about 7.5 hours running on the clock, when i sent it back for repair it came out as an unecononical repair,
found out that the turbine wheels have been changed slightly to stop the blades from flexing and breaking.
needless to say wren did me a real good deal on a super sport, i still have wrens, at the moment ive got a 44 in a amd hawk.
a new 70 in a rafale and the super sport is now on a trusty kangaroo! also owned a few tha ive sold with models,
im sure they will be able to fix her up again, by the way the new wheels have wren wren on them, not wren 54,

hopes this easies the pain,

cheers
snatch

I will wait and see what the bill is for the parts as I will rebuild it myself.

What weight is your AMD hawk I have one I was about to fit the wren 54 into
Xairflyer is offline  
Reply With Quote
Old 04-06-2010, 12:43 PM
  #5
snatch-it
 
Join Date: Nov 2009
Location: red rose country, UNITED KINGDOM
Posts: 166
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Wren 54 catastrophic failure

hi

the hawk weighs in at a tad over 10lbs dry, it carries 1.2 liters of fuel.
this is my second one, the first one had a 54 in it and it came out heavy, it was a bit naughty at times due to the higher wing loading.
replaced the 54 with the 44 and it turned into a different plane to fly, a good mate of mine has it now,
if you go onto google video and type in thrust productions you will see a video of it with the 54 in it. goes very well!!
hope this helps,


cheers
snatch

snatch-it is offline  
Reply With Quote
Old 04-20-2010, 06:21 AM
  #6
Xairflyer
Thread Starter
 
Xairflyer's Avatar
 
Join Date: Dec 2002
Location: Co. Donegal, IRELAND
Posts: 2,744
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Wren 54 catastrophic failure

Not having much luck with getting bits from wren other than NGV, surprised they don't stock parts for a Mk3, I'm sure there are plenty of them still around, will they soon stop stocking spares for a MK4 ? something I would consider before buying a new turbine in the future.

Anyone know what the Garret part number is for the 12 blade compressor ? or have one lying about.
Also I am looking for a turbine wheel new or second hand, I might make a tunnel or buy one from JetJoe which is exactly the same.

The front intake looks to be ok, the compressor blades must be a softer metal as they have wear on them but the intake looks to have been touched by the compressor but no un-evenness or scores. Would know better with a new compressor.

I have cleaned up the marks caused by the turbine wheel on the NGV mainly rubbing against the stators,, need to check shaft, so if I had a tunnel, turbine wheel, compressor, tailcone and a new set bearings, I could rebuild it again.
Xairflyer is offline  
Reply With Quote
Old 04-20-2010, 06:45 AM
  #7
Wren Turbines USA
 
Join Date: Jan 2003
Location: Decatur, IN
Posts: 1,284
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Wren 54 catastrophic failure

Sent you a PM.




Wren Turbines USA is offline  
Reply With Quote
Reply


Thread Tools
Search this Thread
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -8. The time now is 09:28 PM.