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arplast pv 50

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Matt Dovey

Joined: 13 May 2017
Posts: 48
Location: st albans, england

Posted: Fri Apr 02, 2021 12:58 pm Post subject: arplast pv 50

Does anyone know what grease is used on the Arplast PV50 propeller hub? I've had a look through the manual but cant find anything.

Peter jeffers

Joined: 24 Aug 2020
Posts: 20
Location: hp143hr

Posted: Sat Apr 03, 2021 12:32 am Post subject: arplast pv 50

Hi Matt,

No there is nothing recommended in the manual but I have always used a water

resistant grease which is more usually recommended for outboard motors.

Trouble is that if you are not careful rain water can run down up pointing

bldes mand get  into the hub and cause corrosion of the  main blade thrust

bearings. Water tolerant grease tends to ease this problem.  I am afraid

that Arplast were never very good at maintenance practices!!

Pete J



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Pete

aspenbuild(at)me.com
Guest

Posted: Sat Apr 03, 2021 2:00 am Post subject: arplast pv 50

Molybdenum from Wurth is recommended for the Woodcomp gearbox



Sent from my iPad



 	  Quote: 	
		   On 2 Apr 2021, at 21:58, Matt Dovey <mattdovey(at)hotmail.co.uk> wrote:

 

 

 

 Does anyone know what grease is used on the Arplast PV50 propeller hub? I've had a look through the manual but cant find anything.

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=501212#501212

Matt Dovey

Joined: 13 May 2017
Posts: 48
Location: st albans, england

Posted: Sat Apr 03, 2021 9:49 am Post subject: Re: arplast pv 50

Cheers Peter,

I've had the aircraft a few years now. I've kept it inside for that time. But I dont know what happened before that. Its about time I had the hub apart and give it a good looking at.

kennethatkinson178(at)bti
Guest

Posted: Sat Apr 03, 2021 1:29 pm Post subject: arplast pv 50

Hi Matt,   I use JCB special HP GREASE  high performance lithium complex 

extreme pressure grease part no 4003/2017  This grease is blue as the 

original and seems to fit the job. I live next door to a John Deere 

agent so it is handy for me to obtain!  I use the Quicksilver Marine 

Lubricants 2-4-C  Extremely water resistant grease for the outrigger 

wheels and tailwheel bearings. This could also be used in the PV50 hub 

or some other marine grease as Peter says.



You will probably be dismantling your hub anyway to set up the 

mechanical fine stop? LAA require a check of the static rpm and a 

mechanical fine stop setting to prevent over revving.



It is also worth considering new bearings.They are standard items,cheap 

and can be obtained from Bearing Boys or Simply Bearings.



Chees Ken.



On 02/04/2021 21:58, Matt Dovey wrote:

 	  Quote: 	
		   



 Does anyone know what grease is used on the Arplast PV50 propeller hub? I've had a look through the manual but cant find anything.





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=501212#501212




	


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Peter jeffers

Joined: 24 Aug 2020
Posts: 20
Location: hp143hr

Posted: Sun Apr 04, 2021 1:06 am Post subject: arplast pv 50

Sorry I was getting a bit confused with your 2 emails. One talking about an

Arplast PV 50 and the other about a prop strike, although it seems not to

have referred to the same prop in each instance.



Please do not archive,



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Pete

Matt Dovey

Joined: 13 May 2017
Posts: 48
Location: st albans, england

Posted: Wed Apr 07, 2021 12:47 pm Post subject: Re: arplast pv 50

Thanks for the reply's guys. Ken do you have the part numbers for the bearings. Or do you have a link to them. I would like to get them ordered before I start the permit inspection.

Peter jeffers

Joined: 24 Aug 2020
Posts: 20
Location: hp143hr

Posted: Thu Apr 08, 2021 12:57 am Post subject: arplast pv 50

Re Arplast PV50 bearings.  Which ones are you talking about.  Are you

talking about the main blade root bearings or the little bearing that the

pitch change lead screw runs in? Both are available from your local bearing

suppliers and are not too expensive.  I used to get them from a company

called Bearing Traders.

If you intend to change the large blade root bearings please note that this

involves removal of the blade drive dog and subsequent resetting of same

when re assembling.  You will need to make a jig to locate the dog correctly

before reassembly. We used to need to send back to manufacturers in France

to carry out this job correctly but they are not in business now so you will

have to do it yourself.  If you get this wrong you will end up with each

blade at a different pitch. Not good. You will also have to reset the fine

and coarse limit switches. Once more not a happy job, but doable with

patience.

All this is why I now have a Woodcomp propeller.

Pete



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Pete

Matt Dovey

Joined: 13 May 2017
Posts: 48
Location: st albans, england

Posted: Thu Apr 08, 2021 3:32 am Post subject: Re: arplast pv 50

Hi Pete,

I've already replaced the bearings on the lead screw when I replaced the pitch change motor and gearbox. So will be looking to replace the root bearings. There is one blade with some slight play in it. So a new bearing might resolve this.

I did the limit switches last year. Wasn't hard to do. Just time consuming. I'm trying to keep the prop going as long as possible to honest. The cost of replacing it is fairly high and I don't want to fit a fixed pitch.

I'm trying to order as many parts before I start work on the aircraft. Want to get as much done in the least amount of time

kennethatkinson178(at)bti
Guest

Posted: Sat Apr 10, 2021 2:05 am Post subject: arplast pv 50

Hi Matt,       Arplast PV50 bearings. My last replacements were from 

---www.simplybearings.co.uk----



3 off   MB.5040.DLU---Wrapped steel plain bearing bush 50x55x40mm



3off  51110.MB ----thrust ball bearing 50x70x14mm



2off   3x5o.NBR- pack of 2-----3section x50mmbore NITRILE 70 0-rings



Simply have a good website and do a quick delivery.



This is how I service my PV50.-



First get your inspector present! and read PV50 manual.



I have a 4ft square of 1/2 inch ply with a 2" hole cut in the centre 

-screwed to a B/D workmate.



Remove propeller noting spinner and backplate alignement markings- take 

photos.



Place propeller on bench with pitch change motor in hole.



Remove 6 Hub bolts, use a 9volt PP9 battery to touch on  pitch change 

motor to move blades to coarse then lift off top of hub.It helps to have 

another set of hands and eyes to achieve this carefully.



The blades can be lifted out if the pitch change motor has been moved 

coarse enough.



Work on one blade at a time,make a simple jig from wood to hold the 

blade. Mine is a piece of shelf 23"x 8"with a piece of 4x1.5" fixed 

either end.Back of blade rests on one end while the bearing sits in a V 

cut at the other end. At the hub end is fixed a metal bar with a hole to 

locate  the bolt head of the nylon block mounting. All the blades  

should fit the jig accurately before dismantling!



Undo hub clamp and remove thrust  and plain bearing and o ring,clean and 

inspect. Note centre holes of thrust bearings are different, smaller dia 

centre locates on propeller shaft last.larger dia centre locates in hub.



Fit new o ring and bearings with grease.Clean loctite from clamp and 

bolts. Fit blade to jig,refit clamp and tighten bolts with loctite 

applied. You can keep rechecking your jig by trying the old blades in! 

Repeat for blades 2 and 3 .Refit as manual,loctite on bolts at 11 

lbs/ft. Don't forget to pull on blades, to seat the thrust bearings,when 

tightening!



Before reassembling check the mechanical fine pitch stop.It is an 

aluminium tube fitted over the screw actuator with an o ring! This is 

the safety device in case of screw,switch or other failure. It's length 

governs the max revs at take off in the event of one of the above. See 

latest LAA info.



All above is just from memory so I may have missed some parts or they 

may be in the wrong order but I hope it helps. Peter will have much more 

experience of many PV50s and may wish to add to my comments?



Cheers Ken.





should fit jig well before any dismantling!

On 07/04/2021 21:47, Matt Dovey wrote:

 	  Quote: 	
		   



 Thanks for the reply's guys. Ken do you have the part numbers for the bearings. Or do you have a link to them. I would like to get them ordered before I start the permit inspection.





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=501307#501307




	


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IanGale

Joined: 26 May 2022
Posts: 9

Posted: Sat Aug 06, 2022 12:54 am Post subject: Re: arplast pv 50

Thought it would be helpful to add some images of the hub disassembly and bearing, bush, o ring replacement. The orange nylon block has a barely perceptible notch on the corner which the manual talks about - with trailing edge up it goes on the right as you view the blade from tip looking towards hub.

D950F311-7EDB-46BB-BDBF-35CB91ACD9DF.jpeg

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Shiney new hardware from Simply Bearings in the UK

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As was mentioned, one side of the bearing is noticeably smaller than the other so just remember which goes on first

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BA139334-33DB-46B8-B511-F9B3E9A5AEB1.jpeg

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The jig is to make sure the angle stays the same. Just lay the prop tip flat and have the nylon block hard up against in this case, the flat top of the jig. Others use a notch or hole and I think this would be more precise again

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BF012648-07F6-4C16-AF5A-41A3DBD68FAC.jpeg

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The nylon block that engages in the triangular platform to change pitch. The notch is bottom left in this image

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The open hub with old and dirty prop parts

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kennethatkinson178(at)bti
Guest

Posted: Sat Aug 06, 2022 1:28 pm Post subject: arplast pv 50

On 06/08/2022 22:15, Ken Atkinson wrote:

 	  Quote: 	
		   You appear to be coping well with the PV50 refurbishment. Don't forget to fit a

 mechanical fine pitch stop. It is the aluminium tube that limits the travel if

 you have a screw failure.Adjust length to suit your set up.With the fine pitch

 stop  microswitch disabled the motor can be heard loading up as the o-ring

 compresses! Stop pressing go fine in manual at this point. It is a requirement

 and could save the aircraft if you have a screw failure?  Also an interesting

 observation--- my Rotax has always been difficult to start.I have cured this

 with - new sprag clutch replacement, friction torque setup, new Ignitech powered

 ignition. It starts first blade now smoothly, no banging about! Previously the

 PV50  blades quickly became slightly loose but now remain firm in their

 bearings. I believe the poor starting was causing the rapid wear in the PV50

 bearings. I will monitor this and, hopefully, will not have to change the

 bearins quite so often.



 Looking forward to Popham!



 Cheers Ken.  G-CEKV   Mono  no 19

 On 06/08/2022 09:54, IanGale wrote:

 > 

 >

 > Thought it would be helpful to add some images of the hub disassembly and bearing, bush, o ring replacement. The orange nylon block has a barely perceptible notch on the corner which the manual talks about - with trailing edge up it goes on the right as you view the blade from tip looking towards hub.

 >

 >

 >

 >

 > Read this topic online here:

 >

 > http://forums.matronics.com/viewtopic.php?p=507614#507614

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 > Attachments:

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 > http://forums.matronics.com//files/d950f311_7edb_46bb_bdbf_35cb91acd9df_104.jpeg

 > http://forums.matronics.com//files/6a1d2f42_0655_4dce_96ae_efcd5099fd0d_801.jpeg

 > http://forums.matronics.com//files/57fa3d6a_0524_47aa_acb1_8fb4f725eab0_617.jpeg

 > http://forums.matronics.com//files/ba139334_33db_46b8_b511_f9b3e9a5aeb1_187.jpeg

 > http://forums.matronics.com//files/bf012648_07f6_4c16_af5a_41a3dbd68fac_199.jpeg

 > http://forums.matronics.com//files/ca49ab2a_3cbb_459e_b7cb_3eb2bc0a3214_212.jpeg

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