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Rough Pricing of Small Trimarans <30 ft (2008)

Well, here's something that should bring in some debate ;-)

As I am sometimes asked… 'Well what would that cost me?', I decided to put together the simplest possible formula in order to arrive at a quick ballpark figure, depending on whether it was a Production boat or Homebuilt.

It makes a LOT of assumptions of course and will certainly not cover all the details of various sail or mast materials, but it's a useful start.

Because, getting ANY basic data is difficult, it uses only three readily available criteria, so assumes that whatever the item, it's a variable of one or more of these dimensions. For example that sail area is a function of beam and mast height… that material is a function of length and beam… and so on.

Anyway, it's better than nothing and just a start as I'm sure some of you pricing experts can help tweak at least the Cost Constants ;-)
Actually, with the use of these six Cc factors, it's surprising how close one can get!

(By the way, it did appear that the use of (L × B × H)² could be tweaked by using a slightly lower value of the power indice, like 1.8, and raising the cost coefficients, but decided to stay with the 'square' as being far easier to calculate. The KISS principle ;-)

Rough Pricing of Trimarans

L = Length overall (ft)
B = Beam overall (ft)
H = Mast height (ft)

[L × B × H)/1000]² = Cd (Dimension Coefficient)

Cc = Cost Coefficient (see preliminary values below)

US$ Cost(2008)> = Cd × Cc

Estimated US$ Cost = Cc × [L × B × H)/1000]²    (Waters Formula)

Preliminary Values — subject to updates

Cc   Description
175   Production Cost basic boat, no interior, RTS
195   With full equipment, RTS
210      - ditto - with trailer
230   Basic stripped boat of 100% carbon fibre, RTS
100   Total Material Cost (plywood & epoxy sheathing) RTS
120   Total Material Cost (foam & epoxy glass) RTS
    RTS = Ready to Sail

Using this formula and above factors (for 2008 $s)
(I've guessed some of the dimensions) gives:

SeaCart   30 × 22 × 50 = US$250,000
F22 22 × 18 × 35 = US$33,600 basic, $40,340 c/w eqpt + trailer
Trikara 19 × 16 × 30 = US$8,300 for materials, RTS
W22 22 × 19 × 30 = US$15,700 - ditto - all materials
F25A 26 × 18 × 33 = US$28,600 - ditto - all materials
W17 17 × 14 × 24 = US$3,600 - all materials (ply + sails)
= US$8,830 Production (composite) - RTS

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