Anonymous wrote:

I've found this...looks like it could work.  It's 7m tall in total, 3mm wall thickness, tapered starting 2.8 m from the bottom, from 145 to 76mm dia, so would need a small extension according to Arne's sketch, which I think is 7.7m in total. I don't know how the access door would affect strength.  I could weld it to seal it and strengthen that area.

- Jes

Jes, it would be a pitty to buy a mast weakened by any holes. Even if welded shut, those areas will be where fatigue appears first.

It might work for you to directly contact that supplier, and ask them if they would sell you the raw mast - of a production stage, where they did not cut any holes yet. At least, that worked out when I bought the mast for Ilvy. It was cheaper, too.

Cheers,

Paul

Anonymous wrote:

The Corribee has a smallish rudder. This hi-balance JR brings its CE quite close to the JR mast, which again means that the CE will sit close to the boat’s centreline when sailing downwind. This should help the rudder to cope.

Just an idea.

Arne

PS:
It looks to me that the superstructure of the Mk 2 and 3 are very similar, so I used a Mk 3 version here.

(Hi-res diagram in Arne's sketches, section 8, photo11)

Bonjour

Mingming has bildge keels and a skeg in front of a small rudder rather forward. It has a natural tendency to sail strait....

There is not a great weather helm, the helm is very light but sailing headwind, the helm has to be pushed windward about 30°, which is enormous and I suppose that the ruddder must be almost stalled !

It could be interesting to suppress the skeg and to move the rudder to the transom.

It is diffucult to tack.

Eric

NOTE FROM WEBMASTER:  This active and useful thread was moved from Buy/Sell forum to Technical forum at the suggestion of a the original poster and another participant.  See separate new thread on Buy/Sell forum re acquiring a mast. Cheers.

Jes,
if you were able to order that pole without the holes in it, it would suddenly fit perfectly. The trick is to install (glass in permanently?) an oversize lower tube first. Then, your mast can be inserted into this in a similar way as the topmast is fitted in Chapter 6b of TCPJR, except for making it removable. If fitted like in the diagram below and with its lower end raised, that 7m pole will be tall enough, and with 2-3 cm to spare.

Arne

(full size diagram in section 8 of Arne's sketches)

I've found this...looks like it could work.  It's 7m tall in total, 3mm wall thickness, tapered starting 2.8 m from the bottom, from 145 to 76mm dia, so would need a small extension according to Arne's sketch, which I think is 7.7m in total. I don't know how the access door would affect strength.  I could weld it to seal it and strengthen that area.