Re: so how do I rig this thing?; another boat
Dear Cheers/Step,
No. In my humble opinion gluing these spars hollow will in no way be
worth the added effort. And I do not think that it is so much weight
aloft that matters as windage aloft, and making them hollow will not
reduce windage.
In small boats such as these (and not even intended to race) our
bodies serve as movable ballast and can easily offset any small
weight
changes aloft. Please calculate the empty volume you would save and
you will find that it is not much -- even conservativley at 0.02 lbs.
per cubic inch. As you state the boom has less of an effect, because
it is lower and more near centerline. Suppose the boom is at head
high and you save 3 pounds. Then all you need is to move your head
and shoulders to windward an inch or so. And as you say the yard is
even more difficult to glue up hollow, and there is less volume
(weight savings) in the spar to gain. If I were you, I would not
bother.
Wish I was building a boat right now.
Phil Lea
Russellville, Arkansas
No. In my humble opinion gluing these spars hollow will in no way be
worth the added effort. And I do not think that it is so much weight
aloft that matters as windage aloft, and making them hollow will not
reduce windage.
In small boats such as these (and not even intended to race) our
bodies serve as movable ballast and can easily offset any small
weight
changes aloft. Please calculate the empty volume you would save and
you will find that it is not much -- even conservativley at 0.02 lbs.
per cubic inch. As you state the boom has less of an effect, because
it is lower and more near centerline. Suppose the boom is at head
high and you save 3 pounds. Then all you need is to move your head
and shoulders to windward an inch or so. And as you say the yard is
even more difficult to glue up hollow, and there is less volume
(weight savings) in the spar to gain. If I were you, I would not
bother.
Wish I was building a boat right now.
Phil Lea
Russellville, Arkansas
--- Inbolger@egroups.com, StepHydro@a... wrote:
> To the list:
>
> I am getting ready to make the yard and boom for my Scram Pram lug
rig.
> The boom is 2 1/4" square, and I'm considering making it built-up
for weight
> savings. It would have 5/8" X 2 1/4" (true dims.) staves and 1"
wide
by 3/4"
> depth fillers, top and bottom. I would put solid plugs in the ends
and at the
> locations of the downhauls and jiffy reefing cleats.
>
> Now, this is quite a bit more work than gluing up a coupleof 2x4s
and running
> them through a tablesaw. Does anyone believe it is worth the extra
work????
> The yard is 1 1/2" X 3 1/2", so is just right on for making out of
a
single
> 2X4. However, I could save a bit of weight aloft by makiing it sf
staves and
> fillers as above. Does anyone think that *this* is worth the extra
work?
> Of the two, the boom represents the least {|=delta work|} as it
does
not come
> out of common stock as designed, but I expect that weight savings
aloft is
> worth more than below.
> Cheers/Step
To the list:
I am getting ready to make the yard and boom for my Scram Pram lug rig. The
mast I have, per Michalak's design.
The boom is 2 1/4" square, and I'm considering making it built-up for weight
savings. It would have 5/8" X 2 1/4" (true dims.) staves and 1" wide by 3/4"
depth fillers, top and bottom. I would put solid plugs in the ends and at the
locations of the downhauls and jiffy reefing cleats.
Now, this is quite a bit more work than gluing up a coupleof 2x4s and running
them through a tablesaw. Does anyone believe it is worth the extra work????
The yard is 1 1/2" X 3 1/2", so is just right on for making out of a single
2X4. However, I could save a bit of weight aloft by makiing it sf staves and
fillers as above. Does anyone think that *this* is worth the extra work?
Of the two, the boom represents the least {|=delta work|} as it does not come
out of common stock as designed, but I expect that weight savings aloft is
worth more than below.
Cheers/Step
I am getting ready to make the yard and boom for my Scram Pram lug rig. The
mast I have, per Michalak's design.
The boom is 2 1/4" square, and I'm considering making it built-up for weight
savings. It would have 5/8" X 2 1/4" (true dims.) staves and 1" wide by 3/4"
depth fillers, top and bottom. I would put solid plugs in the ends and at the
locations of the downhauls and jiffy reefing cleats.
Now, this is quite a bit more work than gluing up a coupleof 2x4s and running
them through a tablesaw. Does anyone believe it is worth the extra work????
The yard is 1 1/2" X 3 1/2", so is just right on for making out of a single
2X4. However, I could save a bit of weight aloft by makiing it sf staves and
fillers as above. Does anyone think that *this* is worth the extra work?
Of the two, the boom represents the least {|=delta work|} as it does not come
out of common stock as designed, but I expect that weight savings aloft is
worth more than below.
Cheers/Step