Tuesday, July 19, 2011

All those couple of hundred small things.... part 1

I'd like to thank all who posted comments to my latest postings. It's really inspiring to get that kind of remarks to my work. Then, and a bit contradictory to the previous sentence, I have been, for the first time in about five years, a bit fed up of boat building the last week or so, since I returned from my holidays. The boat was rigged in the garden and emptied from all the tools, parts, sails etc, but it has been hard to get on with all those hundreds of things necessary before launch. However, I can feel I'm getting back in the groove now.

I'm still working on some details on the mast. I haven't weighed it yet, but as soon as everything is fitted it will be, and I'll publish the result without any unnecessary delay. It's in the hood of 50 kg from the feel of it. Here are some details of the way it is rigged:

High load halyards are 2:1, that is main, jib and screacher. Main reason is taking load off of the clutches and the mast. Main exits at the base of the mast and leads directly to a winch.

Two headsail halyards exits mast in a pair of moulded recesses each side about 2m above deck, goes trough a Spinlock XAS clutch and a backup Schaefer self jamming horn cleat. A Colligo static snatch block at the deck will lead the halyards temporarily to a winch when needed.

I have had a great e-mail conversation with John Franta at Colligo Marine regarding the standing rigging ++ as I have had some special wishes as I made my own mast. This is his solution to my not-bolting-lots-of-steel-to-the-mast shroud attachment inquiry. Photograph showing the bitter end of the port "anchor" (Chinese stop knot) and the attachment of the starboard shroud to the "anchor" ring. (sorry, this terminology is difficult in a foreign tongue). Also shown is the Genua halyard moulded exit and the Ronstan Core block as an outside sheeve block. Loop will be switched to newly developed heavy duty loops from Colligo Marine. This set up allows the halyard blocks to freely turn as the mast rotates. By the way, I doubt I will ever have a Genua on this boat, a fractional spin for use with reefed main is more likely, I live in the 60's you know...
One more thing - peel ply clearly visible here. I will sail a bit to see if I'm happy with the sideways stiffness of the mast. Easy to add some more UD at this point, but it is designed to be as stiff or a bit stiffer than the original design (including diamonds). As soon as I'm happy the mast will be faired and painted in a light (white/yellow?) colour.

And here is the Colligo "turnbuckle"

Bolt rope track. PVC lining. Might have to make a nice carbon pre feeder, and maybe some sort of temporary lazy cradle for rising/lowering. Have to sail a bit to see the needs.

Just a shot of the nice molded pre bend.  About 78mm (3"), and the sail seemed to fit it very well.  The fore and aft stiffness seems to be a bit less than expected, which I regard as a good thing.

These two shots are showing (so far, I don't have a daggerboard yet) the jib track that squeezes in between the mast foot and the daggerboard head.  Daggerboard have to be partially lowered for it to work.  Sheets will be very similar to the system on the Multi 23 (unfortunately I didn't find out until after this solution was developed, in cooperation with Silas.) Double block at the close end is for 3:1 positive mast rotation control.

Silas (naval architect, owner of a set of F22 plans) also designed and made this custom two (three actually) part fairlead for where the jib furler lines exits the hull sides. They will be further led trough a Colligo two line two part fairlead on the inner beam top and terminated at the traveller support.

At last today's achievement:  The first beam bolting plate fitted.  Very tight fit.


Anonymous said...

Congratulations Tor , don't stop now , I think you are suffering from 'post boat-building tristesse' , all those final details take forever . Looks fantastic and thank you for your blog it has been a daily ritual for me to observe your progress and see you overcome the many problems . Cheers , Jim Buckland

Silas said...

My dad is a big believer in the tough love school of motivation so to borrow some of his words of wisdom:

BUILD, you pussy!


I'm back on August 6th and my exam is on the 15th. Ytterøya Rundt is the 20th??

Anonymous said...

ASny idea how to figure out the bend in the self tacking jib track. Want to do it for an F-82R

Not sure how many laminations of carbon you need to make the track frame.



Tor Rabe said...


About the radius, look here: http://f22r.blogspot.com/2010/07/rudder-mould-repairs-travellers.html
Then the face of the track should be a bit angled compared to the plane the radius describes; face of track pointing about 50% up the forestay and the radius perpendicular to the forestay.

I don't remember exactly the laminating scheme, but it was something around 1000-1400 gsm UD strips on top and bottom of track and then all covered in 45/45 fibres. At least stiff enough for a short track as this.