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Arplast news

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kpeng

Joined: 01 Apr 2011
Posts: 18

Posted: Mon Sep 21, 2015 10:00 pm Post subject: Arplast news

A Google translation of Nigel's post.

Regards

Kevin



Following the loss of a very long trial, Arplast was placed in receivership. Alain Petit, founder and boss Arplast, one of the few industry professionals who will not be content to sell but will be personally involved in the development of ULM particular via the competition for nearly 40 years, threw in the towel at the age of 71. As for the after-sales service thousands of propellers that rotate, a welcome solution is about to be announced.

Sent from my iPhone

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Fred Klein

Joined: 26 Mar 2012
Posts: 503

Posted: Tue Sep 22, 2015 6:50 am Post subject: Arplast news

 	  Quote: 	
		  On Sep 21, 2015, at 10:59 PM, Kevin <kpeng1(at)hotmail.co.uk (kpeng1(at)hotmail.co.uk)> wrote:

A Google translation of Nigel's post.Following the loss of a very long trial, Arplast was placed in receivership. Alain Petit, founder and boss Arplast, one of the few industry professionals who will not be content to sell but will be personally involved in the development of ULM particular via the competition for nearly 40 years, threw in the towel at the age of 71. As for the after-sales service thousands of propellers that rotate, a welcome solution is about to be announced.

	


British humor continues to escape this Yank...

 [quote][b]

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kpeng

Joined: 01 Apr 2011
Posts: 18

Posted: Tue Sep 22, 2015 3:49 pm Post subject: Arplast news

 It's been like that since the year DOT!! ....It's what makes us special 



Sent from my iPad



On 22 Sep 2015, at 15:54, Fred Klein <fklein(at)orcasonline.com (fklein(at)orcasonline.com)> wrote:

[quote] 	  Quote: 	
		  On Sep 21, 2015, at 10:59 PM, Kevin <kpeng1(at)hotmail.co.uk (kpeng1(at)hotmail.co.uk)> wrote:

A Google translation of Nigel's post.Following the loss of a very long trial, Arplast was placed in receivership. Alain Petit, founder and boss Arplast, one of the few industry professionals who will not be content to sell but will be personally involved in the development of ULM particular via the competition for nearly 40 years, threw in the towel at the age of 71. As for the after-sales service thousands of propellers that rotate, a welcome solution is about to be announced.

	


British humor continues to escape this Yank...

 [quote][b]

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italianjon

Joined: 05 Aug 2015
Posts: 68

Posted: Tue Mar 08, 2016 2:18 pm Post subject: Re: Arplast news

Just bumping this topic because of this line:-



"As for the after-sales service thousands of propellers that rotate, a welcome solution is about to be announced."



Has anyone heard what the welcome solution is yet?

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pjeffers(at)talktalk.net
Guest

Posted: Wed Mar 09, 2016 6:31 am Post subject: Arplast news

Hi Jon,

There is a company that is hoping to be able to make and supply blades for

Arplast Props.  There is the little remaining problem of getting them

approved by the LAA and this could take a while even if there are no issues.

Don't hold your breath.

This information is from the LAA.   I trust you are not in immediate need of

blades.

Pete



--

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italianjon

Joined: 05 Aug 2015
Posts: 68

Posted: Wed Mar 09, 2016 1:53 pm Post subject: Re: Arplast news

Hi Pete,



Trust you're well.



I don't need blades, I think   



I am still trying to track down this vibration issue, progress has been slow over the last few months due to work pressures taking all of my time. Anyway, the gearbox work has, so far, not revealed anything obvious.



There is one point of concern on the propeller though. If I pull blades 1 and 3 outwards with a moderate force and try and twist the blade there is no play - it is rigid. But on blade 2 there is a bit of play which I estimate could alter the blade pitch by 3 to 4 degrees. It seems to be a worn plastic block, that sits in the swash plate. I even think you mentioned it when you had a look at the propeller. At that time you noticed it and said it looked OK. But I think it's worse now. If I recall, when we assembled it at yours, there was hardly any play. I also think the vibration could be a little worse now as well, but still not detectable by me sitting in the plane while on the ground. It does appear when airborne, even one single circuit. I am trying to understand what the different effects of a stationary, but spinning prop, and an airborne prop, at velocity are; and if that could give me a clue.



I am also trying to borrow a few vibration sensors from work to give me some data to look at, instead of using Mk 1 eyeball  That could also show me it is present on the ground, because I wondering if the buffet you get while a prop is spinning at cruise RPM on the ground is hiding it.



The swash plates sits about half way up the plastic block, and you can see evidence of wear/pressure on the plastic, which leads to a gap between the surface that is not contacting the swash plate, and the swash plate itself. It is about 0.2 to 0.3mm.



I have checked the blade track and that is almost perfect. It's less than 1mm total deviation.



So my thoughts are starting to think about a single blade flutter.



It appears that if I could get hold of a single set of dogs, or set of plastic blocks, to replace the ones on blade 2, I could take up the play to the swash plate. Then see if that works, by removing this play on blade 2.



I didn't have my camera with me on Sunday, but I was going to video it and send it to you and ask what you though.



Best



Jon

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kennethatkinson178(at)bti
Guest

Posted: Mon Mar 21, 2016 2:19 pm Post subject: Arplast news

Hi Jon,



I have the Arplast and have had some vibration issues that sound similar 

to your own.

I have found some wear in the small square nylon blocks and also in the 

brass 6 mm actuator screw.

I am monitoring this and would like to renew these items.

Probably, I could make them ,but would prefer to obtain some correct 

specification replacements.

The shouldered allen screws holding the nylon blocks are peened over in 

the clamped collar and, therefore would require machining out to release 

them. Correct spec. replacements would be required.

The 6mm brass screw would be fairly easy to manufacture but is pinned 

into the drive dog and could be a bit fiddly to carry out.

I wonder if the new people may also supply the above items?

Cheers Ken.

G-CEKV  KIT 19  370 hrs



On 09/03/2016 21:53, italianjon wrote:

 	  Quote: 	
		   



 Hi Pete,



 Trust you're well.



 I don't need blades, I think  



 I am still trying to track down this vibration issue, progress has been slow over the last few months due to work pressures taking all of my time. Anyway, the gearbox work has, so far, not revealed anything obvious.



 There is one point of concern on the propeller though. If I pull blades 1 and 3 outwards with a moderate force and try and twist the blade there is no play - it is rigid. But on blade 2 there is a bit of play which I estimate could alter the blade pitch by 3 to 4 degrees. It seems to be a worn plastic block, that sits in the swash plate. I even think you mentioned it when you had a look at the propeller. At that time you noticed it and said it looked OK. But I think it's worse now. If I recall, when we assembled it at yours, there was hardly any play. I also think the vibration could be a little worse now as well, but still not detectable by me sitting in the plane while on the ground. It does appear when airborne, even one single circuit. I am trying to understand what the different effects of a stationary, but spinning prop, and an airborne prop, at velocity are; and if that could give me a clue.



 I am also trying to borrow a few vibration sensors from work to give me some data to look at, instead of using Mk 1 eyeball 



 The swash plates sits about half way up the plastic block, and you can see evidence of wear/pressure on the plastic, which leads to a gap between the surface that is not contacting the swash plate, and the swash plate itself. It is about 0.2 to 0.3mm.



 I have checked the blade track and that is almost perfect. It's less than 1mm total deviation.



 So my thoughts are starting to think about a single blade flutter.



 It appears that if I could hold of a single set of dogs, or set of plastic blocks, to replace the ones on blade 2, I could take up the play to the swash plate. Then see if that works, by removing this pay on blade 2.



 I didn't have my camera with me on Sunday, but I was going to video it and send it to you and ask what you though.



 Best



 Jon





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italianjon

Joined: 05 Aug 2015
Posts: 68

Posted: Tue Mar 22, 2016 11:21 am Post subject: Re: Arplast news

Hi Ken,



It's comforting to know that I am not alone. The worst part is no real source of information. As you mention, the specs would be nice, even to source a supplier for our own parts. 



I looked last week at the Nylon blocks and, I agree, they don't look easy to replace. The best option seems to be if a complete set of dogs with blocks can be sourced. Otherwise I foresee a small swing press being needed.



What symptoms do you have? Mine is an RPM dependent seemingly low frequency low amplitude vibration that you can mainly feel through the rudder pedals and the fuselage/wheel well if I lean my thighs against them.



It only becomes apparent once airborne, and flap setting, airspeed, even blade pitch seem to have no effect. Only the change in the RPM. But it seems to always be present, through all RPM values, and no real change in the amplitude. So I don't think a resonance is being established anywhere.



I feel OK flying circuits or just off the circuit, but it's just enough to knock the confidence to go further afield.



Best regards



Jon

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