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PostPosted: Jan 24th, '15, 23:32 
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rseydler wrote:
Emu,

Can you shed some light on that alloy section. I'm going to make me one of those.

Ron
It is 40mm x 25mm x 2mm C channel
Outside dimensions

Also a piece of 15mm x 15mm x 2mm
Angle in the middle

If you want to have a look at it let ne know

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Byrds

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PostPosted: Feb 6th, '15, 22:12 
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This is the jig for laminating up the box. I have first layed up 2 sections of carbon using the blade as mould. Now I have fixed these sections in the jig and will start laying up about 15 to 20 layers of carbon all around At least I know now that the blade is a good fit in the box which will save me hours of sanding. The pressure is on as I will need to finish it this weekend. First race of the season is next Sunday . Luckily the missus buggered of to Sydney for the weekend so I can fully concentrate on the project. Still have the kids around but they will have unlimited I Pad time as a special treat so I can get cracking.


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PostPosted: Feb 7th, '15, 09:32 
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Even your jig is a work of art Mees!

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PostPosted: Feb 7th, '15, 20:19 
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15 layers of 200 gram carbon sounds like a lot but looking at the result I really doubt if my structure has the required form stability. Compared to the Beneteau rudders which are probably a 10 mm flat bar I have only about 4 to 5 mm. The part where the rudder enters / exits the box will be very strong thanks to the fillet but Looking at the end result I think I will have to laminate in a gusset plate on the the sides of the box between top and bottom. Also the top were the tiller will be connected too may need some reinforcement.
I will find out how solid it is when I take it of the jig tomorrow

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PostPosted: Feb 7th, '15, 22:03 
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Really interested to see how it pans out. Best thing about the lady being away for the weekend is that you can use the oven to help speed up the curing.
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Mojo


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PostPosted: Feb 8th, '15, 13:38 
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Last night I wasn't so sure about the strength but It's pretty amazing how solid it feels now. Of course the open C shape allows it to flex but once both ends are fixed on the brackets It will be pretty good. Still think I will laminate a gusset plate in at the back on each side. I vaguely remember seeing an off cut of carbon sheet material lying around at work. Hope I can find it because that would save some time. If not I may have to put the old rudder back on before next Sunday. Don't want to rush it and stuff it up since I have put in way too much time to do that. Still pretty happy how it came out it is really light. kitchen scale didn't work but I think it's something like 300 gram


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PostPosted: Feb 8th, '15, 14:34 
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Nice one mate. Now comes the scary bit of seeing if it's strong enough.


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PostPosted: Feb 8th, '15, 15:29 
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Oh I will be scared alright and double check if I paid my Coast Guard Marine assist this year :D

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PostPosted: Feb 8th, '15, 15:43 
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Looks impressive .. good work.


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PostPosted: Feb 10th, '15, 20:29 
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How does the tiller attach to the cassette?
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PostPosted: Feb 11th, '15, 17:06 
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I will bolt a piece of aluminium U channel on the flat top bit and the tiller will sit in there hinged on 1 bolt at the back so it can be tilted up to space up the cockpit when not sailing.

I won't make it to test it this Sunday unfortunately. Will sail with the old rudder one more time :(

How is the old Hartley coming along ?

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PostPosted: Mar 12th, '18, 14:27 
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Hi mees , any conclusion to this project ?
I just weighed the dagger blade on the rl28 and at 14.5 kgs might investigate an alternative . It feels like solid FG.


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PostPosted: Mar 13th, '18, 09:31 
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Hi Mees, very interesting and I am also keen to hear about the results. It looks awesome.
Lining up a similar project for my Sonata 8, I am also sick of the current blade weighing in on about a ton.

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PostPosted: Mar 14th, '18, 07:43 
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Gezza wrote:
Hi Mees, very interesting and I am also keen to hear about the results. It looks awesome.
Lining up a similar project for my Sonata 8, I am also sick of the current blade weighing in on about a ton.
Had what I think was a 16' skiff centreboard as rudder on the s26, the original, which I tried, was awful. The weight and took a bit to swing up.


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PostPosted: Mar 14th, '18, 09:33 
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By all accounts the RL28 can suffer from heavy weather helm , there are a few things to alleviate it such as altering the top gudgeon and pintal so the blade is more vertical
or as the designer suggests

"We raced a RL28 for many years in all conditions.
In freshening winds we followed this sequence to keep the boat in balance.
First raise the swing keel about 6cm.
Increase tension on mainsail luff and foot.
Increase tension on vang and backstay. Set mainsail traveller to full width.
Ease mainsail in puffs to keep heeling below 25 degrees.
At around 25 knots drop in the first reef.
Never was the boat hard to steer. It is important that the mast has no more than 20cm rake to start with.
Rob Legg."

So my query would be would a much lighter foam sandwich blade such as mees take the load and could you be confident enough in open water not to need to carry a spare ?
One saving grace is that its a dagger and not prone to the pivot hole weakness of a swing blade .


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PostPosted: Mar 14th, '18, 12:24 
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Furstin wrote:
Gezza wrote:
Hi Mees, very interesting and I am also keen to hear about the results. It looks awesome.
Lining up a similar project for my Sonata 8, I am also sick of the current blade weighing in on about a ton.
Had what I think was a 16' skiff centreboard as rudder on the s26, the original, which I tried, was awful. The weight and took a bit to swing up.


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Hi furstin, thanks.
My sonata 8 rudder is already upgraded from the original swing rudder, it had a stainless welded box and drop down rudder, I already modified the rudder box to alloy which works well, now I just want to have a new lighter blade with a uniform profile from top to bottom like Mees made. The current rudder blade is rectangular on top so not height adjustable. But that is fine for now on the ocean.

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PostPosted: Mar 14th, '18, 20:04 
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I've just bought a centreboard off a Macgregor 26. It's a straight foil section about 1800 long and around 380 wide.It's a hollow glass section and water ballasted.
I'm going to see what its like as a foil on my RL28, planning on making a whole new tilting casset system.Probably fill the lower half with some thing so I can plug the 25mm hole that lets the water in and out. My current blade is about 2ton I recon and as about as fair as a stage plank.

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PostPosted: Mar 15th, '18, 19:23 
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Holy **** , my last post in this topic is 3 years ago ! Time is going way too fast it's scary. Well nothing has happened with that rudder since. I still have it but actually completely forgotten about it. It has dropped way down my priority list and I must admit that at some occasions I was happy to have a 2.5 mm stainless rudderstock with (pretty sure nearly solid) fibreglass blade of 24 KG when seeing rudders break left right and centre whilst I can have complete faith that mine will survive World War III.

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PostPosted: Mar 15th, '18, 21:10 
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Yikes
"2.5 mm stainless rudderstock with (pretty sure nearly solid) fibreglass blade of 24 KG"

My b20 has 14 kg dagger and stock
Or a fixed one piece at 7 kg
Which is great to steer with but pita in shallow water.
RL28 14 kg dagger and lightish ali tubular stock and tiller no more than 20 kgsImage


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PostPosted: Mar 16th, '18, 21:15 
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I admire Mees' ability with composites, but I prefer to work with wood. This may suit someone else. It stays on while trailing, and goes down vertically below the pivot when in the water. When we hit something (like stumps in the lake) the rope comes out of the cleat and the blade floats horizontal. It would be easy to adjust the pivot to provide balance if needed.
Peter
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