G'day,
About 60 kgs, which ius a lot of weight up there. Also means the mast
can't taper, which is a lot more windage. And a pain to fix if/when
something breaks. A gaff main is a doable proposition, a gaff jib
much less so, imo.
regards,
Rob
On Sun, Mar 22, 2009 at 10:59 PM, Gardner Pomper <gardner@networknow.
> Hi,
>
> Do you remember how heavy the boom on Rare Bird is? I would assume that one
> just like it, or maybe a bit lighter, would go on top of the mast. I can't
> attach images, I don't think, but here is ASCII art:
> bbbbbbbbbbbbbbbbbbb
> | M |
> | M |
> | M |
> | M |
> | M |
> | M |
> | M |
> | jib M main |
> | M |
> | M |
> | M |
> | M |
> | M |
> | M |
> | M |
> | M |
> BBBBBBBBBBBBBBBB
> M
> M
> M
> - Gardner
> On Sun, Mar 22, 2009 at 3:07 AM, Rob Denney <harryproa@gmail.
>>
>> G'day,
>>
>> Gaff main sails are fine, but the weight of the gaff and the lump of
>> mast sticking up above the sail are both negatives. A gaff jib boom
>> needs to be pretty strong, so heavy.
>>
>> regards,
>>
>> Rob
>>
>> On Sun, Mar 22, 2009 at 12:28 AM, Gardner Pomper <gardner@networknow.
>> wrote:
>> > Thanks, I had not seen that. I have been leery of booms even before one
>> > hit
>> > my wife in the head, scaring everyone rather badly. One of the things I
>> > like
>> > about the harryproa is that it keeps the boom away from the crew.
>> >
>> > This picture is just a regular gaff rig main, though. I mean the
>> > easyrig,
>> > with both the main and jib on the same boom. Can't you put a mirror at
>> > the
>> > top of the mast to move away from triangular sails.
>> > - Gardner
>> >
>> > On Sat, Mar 21, 2009 at 11:19 AM, Kim Whitmyre
>> > <kwhitmyre@dslextrem
>> > wrote:
>> >>
>> >> Gardner Pomper wrote:
>> >> > This is probably a dumb question, but what is the problem with a
>> >> > "gaff" easyrig? By this I mean an easy rig with a boom at both the
>> >> > top
>> >> > and bottom of the mast, so that both the jib and main are rectangular
>> >> > in shape, instead of triangular? Everything I read indicates that a
>> >> > triangular sail is inefficient, and that more sail area higher up is
>> >> > better. I have seen solid wing sails in this configuration.
>> >> >
>> >> > I know weight aloft is a bad thing on a monohull, because it
>> >> > intensives the pendulum effect m the inevitable heeling, but on a
>> >> > multihull, which should never lift a hull (cruising, not racing proa)
>> >> > it doesn't seem like it will matter until you are in alot of trouble
>> >> > anyway. Plus, having a rectangular sail should lower the center of
>> >> > effort considerably, to keep you out of trouble.
>> >>
>> >> Gardner, have you not seen the wingsail used on most of the Wharram
>> >> designs? It is exactly as you describe, with the exception of the lower
>> >> boom: it has none, but instead runs on a traveler between the hulls.
>> >> Here is a picture of my boat in the slip with the main up:
>> >>
>> >> wingsail
>> >> <http://farm2.
>> >>
>> >
>> >
>
>
Change settings via the Web (Yahoo! ID required)
Change settings via email: Switch delivery to Daily Digest | Switch format to Traditional
Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe