No problems trimming, even in pretty stiff wind. I think I've got at
least a 6:1 ratio (i get confused counting), but at any rate, whatever
it is, it's enough to be able to trim without needing the winch. The
way it's set up now, I can't use the winch anyway.
Lee Scott
'87 C-27 #6350
jlenox225 wrote:
Lee,
Great photo. Do you ever have any issue with not being able to trim
when sailing to weather? If so, are you able to utilize the starboard
winch to sheet in with?
-- In [email protected] <mailto:IC27A%40yahoogroups.com>, Tim
Millar <seascoutshi...@...> wrote:
>
> Brandon, Keith and Lee,
>
> Thanks for the helpful advice and photo!
>
> Tim
> 6254
>
>
> I haven't set this up yet. If you go to Harkens site they have a tool
> you can use were you can virtually set up what you want and they will
> tell you the part numbers. I was going to go with a 6-1 but my local
> sailing shop suggested 4-1 would be enough. He's set up a few of these
> lately and I trust his advice. Here's the link
>
> http://www.harkencompuspec.com/ <http://www.harkencompuspec.com/>
>
> Brandon
>
> - -
>
> That's what I did, and it makes a huge difference. I removed all the
> turning blocks that route the sheet forward to the mast, then back
> again, and just installed a fiddle block with cam right there at the
> traveler. The sheet likes to hang down the companionway now, but
> that's not a big deal. If I can figure out some sort of sheet bag
> arrangement that snaps to the side of the companionway frame, that
> would keep everything neat.
>
> The only problem with this arrangement is if you have a dodger. I do,
> but sailing on an inland lake means I only use it for the little bit
> of shade it provides, not for keeping the spray out of my face. So, I
> just removed the front panel.
>
> I just uploaded a photo of my setup to the photos section, under 'Blown
> Away'
>
> Lee Scott
> '87 C-27 #6350
>
> - -
> This all comes down to the physics. To trim your main, you have to
> pull against a force (the lateral force on the main) through a
> distance (the angle the boom moves). The product of force times
> distance is work. When you pull on the end of the boom, you are
> pulling the same angle to achieve proper flow, but the point you are
> pulling on is moving a lot farther than if you have mid-boom sheeting.
> To do the same amount of work, you don't need to pull as hard. To put
> some rough numbers to it, if you pull at the mid span of the boom, you
> have to pull twice as hard for half the distance. To get back to a
> reasonable pull force, you can add purchase (8:1 vs. 4:1 pulley setup,
> for example) to trade back distance for force. Nothing is ever free,
> however, and each layer of purchase adds drag, which hurts in both
> directions (sheeting in and out). Big sheet tension hurts drag too, as
> the frictional force is directly proportional to the sheet tension.
>
> For this, and a bunch of other reasons, end boom sheeting is
> mechanically more efficient, but Sailboat Design, like life, is a
> series of compromises and imperfect solutions. There are a lot of
> practical advantages to mid-boom sheeting.
>
> Keith
>
> #4760
>
