Discussions (1290)

Rudder Dimensions

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Skykomish E29 says:

Ok guys get your tape measures out and start measuring your rudders.
clearly you won't be able to measure internal dimensions, but as much information as possible would be useful, including the year your boat was built &/or sail number so that variations can be observed.
SKeg length
Length of recess in Skeg for rudder shaft
width of recess in skeg
Length of rudde blader both shaft end and stern end
Width of rudder blade top & bottom
thickness of rudder at shaft edge & trailing edge
Length of rudder tube from bottom of rudder to top inside tiller stock
Does top of shaft have square or round attachment into tiller stock.

I think that should give those volunteering to provide some drawings something to work on, The only difference that I am aware of is that some models had a square head to the rudder shaft others were round.
Those who have already got broken shafts would be helpful if you could post the shaft dimensions on here too
Also does anybody know if bearings are used inside the shaft?
Internal diameter of the shaft in which the rudder shaft slides would be a useful addition as a check for correct rudder tube (does that make sense?)
Are all lower fittings the same? if so can somebody provide a sketch of the attachment to the skeg and component parts?

I am not an engineer and am just using this to get the ball rolling obviously those who work in this field may require further information.
1:03AM, 5 October 2012 PDT (permalink)

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pjbharrison says:

Hi Malcolm
There are no bearings in the tube for the rudder shaft on Helm's Deep. During my stays in the lazarette, see my profile photo, I did notice a grease nipple mid point in the tube. The rudder shaft was well coated with grease when removed.
83 months ago (permalink)

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Skykomish E29 says:

Yes I thought that might be the case, makes repair / renewal simpler I think, dependant on tolerances between new metric dimensions of tube / bar available and tube in which it slides
83 months ago (permalink)

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sailing bye1 says:

The silhouette's had a problem with the shaft and outer tube rusting together as the boats aged and especially lack of use, a suggestion was made to provide a grease nipple on the outside tube and with the helm over to port or starboard a similar size hole so grease could be pumped into the space between the tube and shaft, but also into the inner tube if hollow.
Let me know if you want me to provide any drawings but i think the Auto CAD offer would be a better way.
83 months ago (permalink)

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Skykomish E29 says:

The A24 already has that provision, though it is a pig to do especially as often the nipple is buried in glass fibres and so getting the grease gun to connect is difficult & is often neglected. However that is an interesting concept to pump the inner tube full of grease too
83 months ago (permalink)

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Laskinner says:

I would be happy to run up the CAD drawings if it helps, we can post them on the main site as a downloadable?
Just need the dimensions :-)
83 months ago (permalink)

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NormanKlipspringer is a group administrator NormanKlipspringer says:

I now have Klipspringer out of the water and have taken the opportunity to check her dimensions. See below:
Achilles 24 Rudder
and a picture just after pressure washing:
Achilles 24 Rudder 003
If anyone wants any other information then let me know. Having examined the rudder I have decided not to do anything to the structure. The skeg looks good and in order to do anything to the rudder I would have to take it off and this would mean cutting the pintle from the skeg, possibly making it worse when put back together. I have also abandoned the idea of inserting a rod into the rudder tube. This is impossible on Klipspringer since the top of the tube is welded to a square bar for the headstock. On Archimedes the top was open round with a loose insert and so this idea would be viable.
There was s light bit of movement in the rudder which worried me since I did not seem to be able to remove this bt tightening up the bolts in the headstock. After removing the tiller and headstock the movement could be seen in the tube. the square bar moving slightly in the tube. I have inserted greese into the greese nipple and this seems to have reduced if not eliminated the problem but I will probably insert a small packer of stainlees steel to help reduce this movement. I am now happy as far as I can be that the rudder is sound. On reflection I have decided to risk the fatigue failiures experienced by others. If the worse came and I lost steering I could always steer with my outboard in the well or use my sea anchor under sail or possible carry an oar to use on the stern.
Originally posted 77 months ago. (permalink)
NormanKlipspringer (a group admin) edited this topic 77 months ago.

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rothwell_neil says:

Just carry a long oar, very useful piece of kit.
77 months ago (permalink)

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Galwaycub says:

The rudder seems to be missing a pintle bearing or similar on my boat. Does anyone have a picture or drawing of the hardware used to sit the lower part of the rudder into the support on the Skeg?
27 months ago (permalink)

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greyhoundturning18 says:

Look back through my photos
One there of merlins lower pintle that I made as her old one was slightly worn.
Thats a brass bolt threaded down , the shaft goes up into the rudder shaft hole,
We prepared Merlin to do the Jester New sails, new mast. new windows and interior. hull checked. painted orange.
Cost over £6000 but the owner bought a Kelsall tri instead .. I bought merlin.
27 months ago (permalink)

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pjbharrison says:

On Helm's Deep the rudder shaft was a hollow tube and the pintle inserted into that with no bearing, just a snug fit.
27 months ago (permalink)

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