My little piece of peace

Hi Groper,
I missed this post yesterday (on a new page)... The lay-up was up & down and the ends of the cloth were wrapped over the top & bottom and sort of faired and shaped to make the platform for the green "washer" using epoxy & micro-spheres...

 

yes, but HOW MUCH glass, do you know the cloth weight and number of layers?

 

fairly light - like tape - weft & warp - folded a little as it rounds the shaft 400gsm...

However, 2 x 400gsm tapes laid at 90 degrees to each other across the top - at 45 degrees to the blade of the top of the rudder - around the shaft may be significantly better as per advice from the expert up here - You know who I mean...

 

Well i just winged it... Way too many layers of 750gsm triax... the first copper coat is done, we need to start thinking about getting these rudders back into your boat... you also need a delrin (acetal) bush.... i think one of the bearing shops in town like BSC or allied bearings will have this rod stock material in store, i wonder if we can cut it into shape with a hole saw and a drop saw tho??? i kind of molded the rudder top so its flat and shiney for the bush to ride on... just need to grind off the flash and give it another copper coat and were all done...

 

Hi Groper,
Beaut :!: Who would I order a delrin bush through? and size?

A PM with the phone # and I could call and order on Monday... (delivery to your place?)

 

like i said, BSC bearings, allied bearings, theres a few of them in town... they would most likely sell the rod, but we would need to cut the washer from the rod... perhaps a hole saw and a mitre saw (both of which i have) might be able to do it, having never tried i dont know???

 

OK I will depart around 09:00 for Cairns and get the stuff trying Allied first... I will have my phone and turn it on too (for a change) once I am mobile... I do not think I have any credit left but should be able to answer... :?:

 

Hi Groper,
I went to both suppliers and they said "No we do not have that - Not to use the stuff they had as it absorbs water and expands - Neither could they identify the sample... I will try to contact 'Millsey', (he is still building in the block where I was) - but he is working up near Mackay :?: - driving a water truck or something :?: Even at several businesses near 'Norships' - no one could suggest or identify my 'bushing' and one bloke who was anti fouling his yacht spoke of a problem with a similar bushing on his rudder due to expansion by absorbing water and mine was different and he could not identify the material... So I am F'ed if I know...

The people around Fuji are copping a bashing from the cyclone BOM links
here http://www.bom.gov.au/australia/cha...ST&area=GAuR&model=R&chartSubmit=Refresh View for MSL pressure
and http://www.bom.gov.au/australia/sat...=p23&domain=14&view=34&satSubmit=Refresh View for satellite view,
as well as sea surface temperature here http://www.bom.gov.au/oceanography/forecasts/idyoc13.shtml?region=13&forecast=1

 

I didnt want to say buy yes thats right, Ive see a few guys literally cut rudders off trying to get them out.

I have said on another thread about rudder bearings to use cutlass bearings.

 

My rudder "posts and shafts' are water lubricated and the bushes are to ensure vertical clearance to the rudder, so it can move L & R 30 degrees or so, to the limits of the 'Ackerman' arms and hydraulic ram... It (the bush) serves to give correct vertical positioning - - - the rudders are incredibly light and easy to turn at all times... What is a "cutlass bearing" - do I have to say, "Arrrrgh me hearties when using it?"... :?:

 

Did you ask for acetal or delrin? According to the research ive done, thats the stuff to use...

Dont always listen to the **** wits in the store, i was told by the duchebags down at nuplex composites, who should know better, some very inaccurate information regarding some vinylester resin and hardeners the other day... bloody hopeless...

Anyways, i trimmed up, sanded and recoated the rudder this afternoon, so its all finished... i think we should cut the post and drill the holes in situ... unless your sure that the length is the same on both rudders? How accurately was the boat built?

 

You've got Ackerman!!! not many boats use that. I have incorperated it and it made a difference but im planing.

My rudders are not water lubricated either they only turn a few degrees not a spinning 2000RPM.

 

Hi groper,
I did mention Acetel / Delrin and that choice was either unavailable or water-absorbing and anyway was rejected from being appropriate by the staff... (I had the product manes written down so I would not forget to mention...

Hi Frosty,
"water lubricated" means that there is no added or additional lubrication as both are g.r.p. manufactured products along similar lines to fishing-rods... I guess, as the company also makes quality fishing-rod blanks to order...

 

I know what water lubricated means!!! its doesnt matter your rudders turn a few degrees---occasionally-- not spinning at 2000 rpm.

The contact with rubber absorbs vibration.

10 years fitted now-- nothing.

 

If you want stuff that doesn't expand in water, use Vesconite. Not cheap though.

Otherwise use oil filled nylon or HDPE. Sure there's a bit of expansion, you machine the hole oversize about 10% and see how you go. How precise a fit do you need? More precision, better materials, more dollars for both materials and machining.

10 minutes work on my lathe to make my rudder bushings. The prop shaft bushing is a bit more work in Vesconite but it has to seal against oil in the shaft tunnel.

PDW