: Got Nick's Petrel plans out,at last, and came up with an issue I
: have fudged in the past,my excuse is that I am an engineer so
: must understand everything.But, hey, what's half an inch amongst
: freinds?
: Station form profiles from plans, are literally paper thin.The
: placement of them is understood ,along the boat length.The
: actual forms are ,in my case 1/2 "thick.This means ,and
: please correct me if I am wrong,that the form material[wood]
: should lie forward of the paper "sheet" forward of the
: widest part of the boat,and also the form material should be aft
: of the paper sheet aft of the widest part of the boat.All so you
: don't fair the forms on the wrong side and so get wrong fair.I
: noticed the midle forms, on Nick's plans, at what may be maximum
: beam are spaced at 11 1/2 "[half inch less than the
: standard foot].I am guessing this is just an aberation for the
: cockpit area as it doesn't help with my above
: understanding.UNLESS, big unless, it is expected that the paper
: sheet gets stuck on the OTHER SIDE of the material form.This is
: odd as I would not want to add material,instead of fairing off
: material to the material of the form so that the strips sit well
: on them....If anyone can put this hard to explain[on my behalf]
: issue into plain language and tell me "I'm onto it"or
: not I would be aprecaitative.Other wise, it'll be another
: fudger.
: Cheers,from Paul NZ.

Hi Paul

I'm in NZ too (Christchurch).

You do need to account for the thickness of the forms. But it's the reverse of what you said.

The form material needs to be 'behind' the paper forward of the max width, and 'in front' after of the maximum width. So that it's the edge of the paper that the wood strips touch.

The image below shows it.

I don't know the paper form spacing for the petrel (maybe it's 12" like the Guillemot"), but so long as whatever Nick has stated as the gap between the *paper forms* is preserved, you can make the form material whatever thickness you like, and subtract that from the required gap between the paper forms.

Cheers, Ian

http://ianjohnsonz.wordpress.com/