New Posts New Posts RSS Feed: RS800 spreaders
  FAQ FAQ  Forum Search   Register Register  Login Login

RS800 spreaders

 Post Reply Post Reply Page  <12
Author
JimC View Drop Down
Really should get out more
Really should get out more
Avatar

Joined: 17 May 04
Location: United Kingdom
Online Status: Offline
Posts: 6661
Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Topic: RS800 spreaders
    Posted: 29 Jul 12 at 10:25pm
Track wobbles about a bit too doesn't it... It almost looks to me as if the goosneck is even more out of line as if the whole spar has twisted, but I find it hard to imagine that's possible. Must admit when I do spreaders I drill the holes for the second one in place so as to get them entirely symettrical as I'm not a good enough fabricator to do exactly even spreader brackets.
Think in this case you're just going to have to take the best compromise and juggle positions as much as you can to get things as even as practical.
Back to Top
CurlyBen View Drop Down
Really should get out more
Really should get out more
Avatar

Joined: 17 Aug 05
Location: Southampton
Online Status: Offline
Posts: 539
Post Options Post Options   Quote CurlyBen Quote  Post ReplyReply Direct Link To This Post Posted: 29 Jul 12 at 7:37pm
Originally posted by JimC

Make sure the mast cannot twist and is exactly straight. But .2mm probably multiplies into quite a bit at the end of a spreader. Probably the best thing to do is to check a bunch of other people's boats, because I bet none of them are exactly symmettrical...
Thanks Jim - unfortunately I can't check other boats at the moment as I don't have a club! I can cope with a bit of asymmetry, but this looks too much to me. I might have to try and rig up some way to measure the angle from mast to spreader. Unfortunately there isn't a lot of wiggle room - not many positions the spreader can take, and the class rules state that a line stretched from shroud to shroud should measure 150mm +- 10mm, which is not much movement at the root. The newer masts have a fixed spreader, unfortunately I don't think it can be fitted to these masts.
RS800 GBR848
Weston SC
Back to Top
CurlyBen View Drop Down
Really should get out more
Really should get out more
Avatar

Joined: 17 Aug 05
Location: Southampton
Online Status: Offline
Posts: 539
Post Options Post Options   Quote CurlyBen Quote  Post ReplyReply Direct Link To This Post Posted: 29 Jul 12 at 7:24pm
Hopefully now with pictures...

Spreaders from top

Spreaders from bottom

Bracket

RS800 GBR848
Weston SC
Back to Top
JimC View Drop Down
Really should get out more
Really should get out more
Avatar

Joined: 17 May 04
Location: United Kingdom
Online Status: Offline
Posts: 6661
Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 29 Jul 12 at 7:23pm
Make sure the mast cannot twist and is exactly straight. But .2mm probably multiplies into quite a bit at the end of a spreader. Probably the best thing to do is to check a bunch of other people's boats, because I bet none of them are exactly symmettrical...
Back to Top
CurlyBen View Drop Down
Really should get out more
Really should get out more
Avatar

Joined: 17 Aug 05
Location: Southampton
Online Status: Offline
Posts: 539
Post Options Post Options   Quote CurlyBen Quote  Post ReplyReply Direct Link To This Post Posted: 29 Jul 12 at 5:49pm
Right, I'm really scratching my head here.. After a couple of years where life really got in the way of sailing I'm trying to get my RS800 sorted out and back on the water. One of the jobs I needed to do was replacing the lower spreaders (Holt mast). I got the new ones from RS and cut them down to the same length as the old ones (on RS's advice, they were about 30mm too long as supplied) being careful to cut the outboard end so I didn't disturb the inboard end holes. Set them up according to the class rules and was happy.. until I sighted down the mast. The port spreader has significantly less deflection than the stbd (the stbd looks correct, as it's at pretty much the same angle as the upper spreader).
To try and sort the problem I've:
  • Taken out the spreaders and compared them. They're identical
  • Switched the spreaders round, the port spreader has less deflection both times round
  • Checked the bracket is even on the mast - about .2mm away from symmetrical about the mast track, so I don't think that's the problem
  • Tried to measure the spreader bracket - not very easy, but no difference I could make out side to side
which to me should mean that when the spreaders are in the same holes they should be at the same angle, but they're not! I'm a bit reluctant to start having the spreaders on different holes each side, but can't see what else I'm missing. I'll post some pics up when the rain's passed. In the mean time if there's anything obvious I should be checking, please say!
RS800 GBR848
Weston SC
Back to Top
 Post Reply Post Reply Page  <12

Forum Jump Forum Permissions View Drop Down

Bulletin Board Software by Web Wiz Forums® version 9.665y
Copyright ©2001-2010 Web Wiz
Change your personal settings, or read our privacy policy