Scamp #460 - got my plans (and many questions as well)

[bei.beckers]

Hi Scampers,

me again, i got my plans- it's #460. And there are some more questions.

What forces must the ropes take? I'd choosen 6mm- ropes with 520daN breaking load (means 170daN /380 lbs usual workload).
Is this enough? In that case i'd take 6mm everywhere but for the sheet, which is more comfortable at diameter 10mm.

One question 'bout the rigging: Why is the halyard just a single rope while the boom downhauler has a pulley? I'd expected to have the boom attatched to a fix eye with a rope and the halyard to be worked with the pulley. Why is the pulley placed at the downhaul?

I prefer cutting my ply myself, so i can add a footwell and some minor ideas. But I can only get 4mm, 8mm and 10mm Okume- plywood instead of 6mm and 9mm. Well 10mm for 9mm isn't be a big deal, but 8 for 6mm could cause problems when bending the planks and the cabin top. What ply did you choose? Do you think 8mm will work? I'd maybe take 2x4mm for the cabin top to get it bent more easily.

Thanks for your ideas,

Best regards, Martin

[Jason Builder]

Hi Martin,

Your question about why the yard halyard is rigged with a single-block while the boom downhaul is rigged with block and tackle that generates higher force , is a good question. I am not the designer, but my thought is that the single block will allow the sailor to raise the yard and sail quickly, while the increased mechanical advantage of the downhaul will help achieve a nice tight rig.

Regarding the thickness of your plywood,I would caution against using any thickness other than that specified in the plans. Extra thickness will be heavier and difficult to bend and will change the weight distribution of components of the boat. Thinner sections will be lighter and weaker than the designer intended. Maybe other people have experi nice to share about using different thickness materials. I built from a kit which had the specified thickness materials.

Good luck!

Best Regards,

Jason

[bei.beckers]

Hi Jason,

thank you again, i saw your reply quite late 'cause of easter days...
This may be an explanation- having a fast halyard is good and I forgot the huge ammont of rope to stow away having double the way...

In the meantime i decided to go with the kit, mainly to safe time -and my wifes nerves as well
Choosing 8mm ply oder 6mm would have doubled the force for bending- i don't see this is a good solution, not to mention the weight issue.

What do you think about the ropes? Is a 6mm rope with 520daN breaking load (means 170daN /380 lbs usual workload) tough enough for use as halyard?

Best regards,
Martin

[wdscobie]

What do you think about the ropes? Is a 6mm rope with 520daN breaking load (means 170daN /380 lbs usual workload) tough enough for use as halyard?

Martin:

6mm (about 1/4") double braid line is more than enough for a SCAMP. On my much larger boat, a Montgomery 17, i use 1/4" line for the jib sheets and halyards. for comfort 5/16" (~8mm) on the main halyard. the remaining sail control lines are 3/16" (~5mm).

IMO I'd use 5/16 on the main sheet (for comfort ... but be tempted to use 1/4) and if my hands were comfortable 3/16 for all the other lines (ie, reefing, halyards, etc).

[bei.beckers]

Hi,

thanks, that's what i hoped.
I Just want to avoid an unnecessary variaty of ropes.
The mainsheet will be 8mm or 10mm for conveniance.

Best, Martin

[bei.beckers]

Hi Guys,

my mast is finished. I guess the mast is the most challenging woodwork on Scamp, so I'm happy I succeede

Some pic attatched- you can see them all on my page
https://martins-dock.jimdofree.com/
(Sorry: in German only...)

best, Martin

[Peter E]

Regarding your lines (sheets) John Welsford recommended non stretch lines for the halyard and downhaul. The main sheet, what ever is comfortable.