Amt of Lead in Centerboard?

[Dmksails]

Poured lead into my centerboard today. Plans say that it should have 20lbs of lead. I filled it to the top and it only took about 13 lbs. According to google, a cubic inch of lead is about .41 lbs. Using dimensions of 4.5 x 9.5 x .75 inches you get a space of about 31 cubic inches which then holds 12.8 lbs of lead.

Did I miss something?

[dbeck]

We did not pour lead, but only used lead shots mixed with epoxy. We compensated the lower density by a 2nd cutout [1] and ended up with 15 lbs. So far we did not have issues with lowering the centreboard.

I vaguely remember that other builders observed a similar discrepancy as you, but I don't find the reference right now.

[1] viewtopic.php?f=3&t=1096&sid=0be892ae6de5c99d8e608d0314d80ade#p5430

[slash2]

As I recall, the plans show a larger area for lead than the actual cutouts provided in the kit pieces. As suggested by others, I added an additional section of lead to bring it up to the amount specified in the plans. I think it’s worth doing, as it is still easy to raise the centerboard and it does help when lowering it.

[Dan]

I emailed CLC about this. I got this reply from Jay:

Mr Wells,
The cut out on the centerboard is plenty big to pull the centerboard down. The 20# shown on the plans is a typo.

I just used the cutout in the plans for the CB lead. It seems heavy enough, but I'm a long way from launching so won't know till I try it.

[[email protected]]

I didn't worry about the centerboard lead weight at all - I simply filled the pre-cut opening.
My centerboard goes up and down just fine.

BTW, based on the plans, I think the suggested centerboard pendant length of 28 inches is too large.
The centerboard "down" position on sheet 4 of the plans would require a 23 inch length.
If you set it to the recommended 28 inches, you might want to check the actual
"down" position (I guess by jumping in the water with a face mask).

[dbeck]

Doug,

this is off-topic, but 5 inches on the pendant length is something. This reminds me of an older post in this forum on the refit of PS 1 in 2016 [1]. Below the first photo it says, that the pendant was about 4 inches longer (" ... had stretched almost four inches in eight years ... ").

I believe you have re-checked that actual length of your pendant (?). If yes, I wonder what is wrong: The number of 28" in the manual or the indicated "down" position on page 4 of the plans? Have you contacted CLC about this?

Dietrich


[1] viewtopic.php?f=3&t=803&start=0

[[email protected]]

this is off-topic, but 5 inches on the pendant length is something. This reminds me of an older post in this forum on the refit of PS 1 in 2016 [1]. Below the first photo it says, that the pendant was about 4 inches longer (" ... had stretched almost four inches in eight years ... ").

I believe you have re-checked that actual length of your pendant (?). If yes, I wonder what is wrong: The number of 28" in the manual or the indicated "down" position on page 4 of the plans? Have you contacted CLC about this?


[1] viewtopic.php?f=3&t=803&start=0

I never talked to CLC about it. I suspect that the centerboard could go a bit further down than what is shown on sheet 4.
I used Spectra line like the manual suggested, and there is absolutely no way it could stretch 18% under even a heavy load.

Unfortunately it is quite hard to lower or inspect the centerboard out of the water. Last week I jacked up the boat a few inches in the trailer, so I could lower
the centerboard just enough to see the leading edge and tip. The tip was a little bit dinged, but the rest of the leading edge looked like new.