Swing Rig 36/600

Rcsailing.net Technology Discussions
1

Hi
I have been asked to help a friend re rig an existing 36/600 with a swing rig. Does any one know of a suiable design. I can adapt the boat and make the rig and sails but do not have the design skills to design the sail plan for a swing rig.

Regards

JohnK

2

Hi Kiff
I think the best way is to get in touch with AMYA class segretary. http://www.modelyacht.org/index.php or here http://www.modelyacht.org/size.html
I went anyhow on the AMYA web and found this picture. I scaled it to obtain the 36" Hull lenght.
Automatically I got the various dimensions on the Rig. The pink triangle are the basic shapes of each sail for a Classic RIG. A short calculation show more than 740sq.inches instead of 600. Apparently is a modified model !!!
For the Swing Rig, you need to arrange the proportions of the sail’s surfaces as such that the Jib shall not have a surface above 26% of the Main to obtain a regular functioning. According to this picture the jib is around 44%
According to the Rules reported on AMYA, the roach are limited to 2 1/2 inches
The mast bent show a 0.5"
With that, I think, you have sufficient informations to build a rig

All above is extracted from the picture, therefore one could take this informations as indicatives.

Cheers
Claudio

3

Hi Claudio
Thanks very much for the info. It is realy usefull.

Regards

JohnK

4

A word of warning: I think swing rigs, to work properly (weathervane), need a somewhat smaller jib than the “conventional” rigged boats.

5

RE: Sail area ----- while the class is called 600 (600 sq. inches) tthe class measures the triangle of the sails - and as I recall, it allows up to 2 inches for roach (trailing edge) of sail beyond the basic triangle.

This is why it probably measured bigger on Claudio’s scaled efforts from the photo.

6

Martin
…the somewhat smaller jib…

the matter of facts the jib surface should be a maximum of 26% of the Main as already written in my reply above.

Cheers
Claudio

7

Sorry Claudio, I didn’t read your reply well enough.:blush:

8

:cool::cool:

9

Hi John Thanks for all your help and Peter is bring the hull up tomorrow morning,hope youi do not mind me joining ? cu later Terry

10

Hi names Terry [Plymouth u k]
I am in the midst of changing from a normal rig to a Swing Rig on my 36/600 yacht will the mast position be the same or is there a way of finding the correct position for a Swing Rig Any help much appreciated Regards Terry