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Wren 54 starter problem

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Keith Simmons18/06/2017 18:09:32
431 forum posts
6 photos

Many thanks Jon for the reply & how you got the Wren turbine.

LOL about asking us not to crush our models, unfortunately we don't learn if we don't make mistakes and it's how quickly we recover and do the correct way to minimise takes time and practice as you know well. 😎

Oh dear that there may be other issues regarding the Wren 54 turbine and not just the bendix starter and I do hope you will solve all the problems in the end and enjoy running the Wren

Jon Harper - Laser Engines18/06/2017 18:21:21
2752 forum posts
124 photos

Well, through the wonders of the interwebs I can present my floppy starter.

I think this is broken as its floppy, sticky, and had end float in the motor. It has also been rubbing on the casing that holds it on the front. If anyone else has experience with these things please let me know if they are all like this or if mine is busted.

Thanks

Don Fry18/06/2017 19:05:37
avatar
1654 forum posts
24 photos

Sorry mate, but not flown, run for 4 minutes, don't work. You do the maths.

I do commiserate. The last crash buried an ancient 75. No damage. You must have 'ard customers.

onetenor18/06/2017 20:02:57
1073 forum posts

Thinking sideways it was sticking right from the start and the 4 minutes running in that state without it being noticed caused the resulting slop and wear..It never did full size starters any good either.This more than likely is what upset data terminal too. Sorry to say but the motor needs a rebuild and a new starter in MHO Plus reprogged data terminal.

Good luck contacting Wren though

John O/T

Edited By onetenor on 18/06/2017 20:04:45

Jon Harper - Laser Engines18/06/2017 20:07:24
2752 forum posts
124 photos
Posted by Donald Fry on 18/06/2017 19:05:37:

Sorry mate, but not flown, run for 4 minutes, don't work.

A peek inside with a borescope prior to me buying the engine revealed the combustion chamber to be clean as a whistle. As the chap in question became ill and then died not long after buying the engine I have no reason to believe that 4 minutes on the ECU is inaccurate. He had two turbine models in his possession and neither were airworthy at the time of his death and his friends within the club knew he never flew the engine or even ran it himself. It should be noted that over 10 years passed between his death and the sale of his gear.

All I am looking to learn at the moment is if the above video is typical of these types of starter as I have not dealt with one since I was at uni and I cant remember that far back.

Jon Harper - Laser Engines18/06/2017 20:10:06
2752 forum posts
124 photos
Posted by onetenor on 18/06/2017 20:02:57:

Thinking sideways it was sticking right from the start and the 4 minutes running in that state without it being noticed caused the resulting slop and wear..It never did full size starters any good either.This more than likely is what upset data terminal too. Sorry to say but the motor needs a rebuild and a new starter in MHO Plus reprogged data terminal.

Good luck contacting Wren though

John O/T

Edited By onetenor on 18/06/2017 20:04:45

The data terminal issue was down to a broken wire within the telephone lead. I am not sure how this could have happened. The damage to the rpm sensor lead was likely caused by the engine sucking it into the intake. Fortunately it never made contact with the blades.

Rebuilding is not an option as wren no longer support it. Given that the engine runs fine now I fixed the electrics I only have the starter to worry about

Denis Watkins18/06/2017 20:31:58
1752 forum posts
83 photos

OK Jon, a jet boy gave me a demo today and the Bendix is solid and purposeful, with no slop, and it flings to engage solidly, and disengages solidly and quickly.

There is no oil or lubricant or spring. The fitting and brass slide firmly.

Sadly, one sold on eBay recently for £5.99, and is worth a look there.

Looking at your YouTube vid, bears little resemblance to a working unit with no slop at all, no wear, no other movement other than

Positive in and out

Hope this helps

Jon Harper - Laser Engines18/06/2017 20:53:02
2752 forum posts
124 photos

Cheers Denis. I didn't think it could be right, I will check out my options

Andy Meade19/06/2017 15:05:38
avatar
2069 forum posts
532 photos

Apologies if the sucking of eggs is involved, but Wren changed ownership a year or two ago. New details are here : http://www.wrenpowersystems.com/

Jon Harper - Laser Engines19/06/2017 15:45:54
2752 forum posts
124 photos
Posted by Andy Meade on 19/06/2017 15:05:38:

Apologies if the sucking of eggs is involved, but Wren changed ownership a year or two ago. New details are here : http://www.wrenpowersystems.com/

I am up to about 30 attempts to call the above with no answer

Keith Simmons19/06/2017 18:34:20
431 forum posts
6 photos

This is not good enough and wrenpowersystems should put their house in order.

Is wren USA a big market ?

If yes then I expect the Americans will do something about it as the turbines are not cheap.

Have you tried the American forums and did they offer you any good advice?

Well done in getting the turbine to work and I am sure you can rig something so to get the turbine starting and then running with the starter disengaging to your satisfaction. 🤓

Edited By Keith Simmons on 19/06/2017 18:42:52

Bob Cotsford19/06/2017 19:05:12
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6703 forum posts
359 photos

Here you go Jon, it's this or a Viagra in every tankful.face 1 Is there any chance your toolmakers could rebuild/remanufacture it?

Don Fry19/06/2017 19:45:15
avatar
1654 forum posts
24 photos

Bob, poor devil can't keep up with Lasers.

Jon Harper - Laser Engines19/06/2017 20:23:16
2752 forum posts
124 photos
Posted by Bob Cotsford on 19/06/2017 19:05:12:

Here you go Jon, it's this or a Viagra in every tankful.face 1 Is there any chance your toolmakers could rebuild/remanufacture it?

If I can press the pin out I can sleeve it and then press the pin back in. What I cant work out is why it is like this when the engine is new

onetenor19/06/2017 22:13:31
1073 forum posts

The turbine's new but it begs the question is the starter new in that case ? Try contacting Wren U.S.A.

Jon Harper - Laser Engines19/06/2017 23:09:12
2752 forum posts
124 photos
Posted by onetenor on 19/06/2017 22:13:31:

The turbine's new but it begs the question is the starter new in that case ? Try contacting Wren U.S.A.

Wren USA are long gone, the link posted above is all that is left as I understand it

Nigel Dell20/06/2017 07:02:02
261 forum posts
15 photos

Jon

For information and possible help try contacting Larry Wolfe at Jet Hanger Hobbies as he/they used to be agents for Wren and in my experience does at least answer emails! I met him at a Mesa Jet meet a few years ago a really great helpful Guy.

Jon Harper - Laser Engines20/06/2017 09:31:15
2752 forum posts
124 photos
Posted by Nigel Dell on 20/06/2017 07:02:02:

Jon

For information and possible help try contacting Larry Wolfe at Jet Hanger Hobbies as he/they used to be agents for Wren and in my experience does at least answer emails! I met him at a Mesa Jet meet a few years ago a really great helpful Guy.

Thanks Nigel, i will give that a try

Denis Watkins20/06/2017 09:55:07
1752 forum posts
83 photos

You must have noticed Jon, though a simple design as it needs to be

That Bendix, is made from a substantial piece of steel

But after the helix is milled both sides along the tube length,

Then there is barely a couple of millimeters of metal holding it together.

As a part, it is not for sustained use obviously, and only comes into use for a few seconds each flight

When that part is spun up, centrifugal force alone must send the heavier part out until it slams to a halt !

This must be a common replacement

Jon Harper - Laser Engines20/06/2017 10:26:21
2752 forum posts
124 photos
Posted by Denis Watkins on 20/06/2017 09:55:07:

You must have noticed Jon, though a simple design as it needs to be

That Bendix, is made from a substantial piece of steel

But after the helix is milled both sides along the tube length,

Then there is barely a couple of millimeters of metal holding it together.

As a part, it is not for sustained use obviously, and only comes into use for a few seconds each flight

When that part is spun up, centrifugal force alone must send the heavier part out until it slams to a halt !

This must be a common replacement

To be honest i am not sure. What would be perfect would be to speak with the original manufacturer and get the information i need directly but that seems to be out of the question

 

Just tried to call again and the phone system tells me they are closed and their opening hours are 9-5 mon-fri....but its 10.30 on tuesday sooo why no answer? 

Edited By Jon Harper - Laser Engines on 20/06/2017 10:28:06

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