Coaming drawings(dimensions)

[ebb]

Here are some actual measurements taken from the boat's original coamings.
Coaming ends are obviously trimmed to angled cuts, and would probably be
layed out on full sized prepared planks that are 11 1/4" W and 84" long.

Top of coamings is dead straight. No curve. As is the bottom

The length of the cockpit that the coaming drops into measures 76 5/16"
-- measured off the old coamings.
The drop (where the coaming is screwed inside the cockpit) is 4" deep at the
cabin. and 2" deep at the aft end. Total length of coaming is 7'.
(Approximating for angle cuts.)

Height off the deck at the coaming blocks is about 7" + 4" (actual measure)
= 11".
11 1/2" could be the width of your stock.
Height off deck aft is about 3" -- 3 + 2" (actual measure) = 5".
Allow for 50 years of sanding, movement of the planets and little shrinkage.
Original mahogany thru-out the boat was Honduras -- an amazing durable
and stable wood. Original rudder also Honduras.

Coaming blocks are cut from 4x4x8" stock, There are angles top and bottom
that should be taken from diagrams or actually have the coamings in place to
mockup the blocks in place. 3/4" coaming is dapped 1" into the block for
3 #12 FHWS. Leading curved corner probably came from a 4 3/4" circle.
Curve is same top and bottom of block, so it probably was band sawn.

Four 1/4" hexhead lags (at least two lengths) and fender washers, from inside
the cabin, were probably used to clamp the coaming block to the boat.

Winch 'islands' are pot shaped, wide at bottom, smaller at top with just enough
room for a 4 1/4" winch base. Probably bronze South Coast. Believe the shape
of the island is more elliptical than circular. It's about 5" tall, ellipse truncated
(cut flat and butted to the coaming): 7 1/2" at the deck and 5 1/2" round over
edge around the winch base.
A bunch of angles that will need patterns, if you are restoring to the original.

Islands are horizontally stacked two-by mahogany. After gluing together cut out
on a bandsaw with a tilting table to easily get the angles.
Each island was fastened thru the deck with a single 3/8" flathead 7" bronze bolt.

8x2 1/4" FHWS in a straight run were used to fasten coamings to the cockpit.
4x2 #12 FHWS, in a square pattern used to connect coaming to the winch island.
3x2 #12 FHWS for the coaming connect to the corner block. All flat head wood
screws were bronze. Check out Frearson SB wood screws at http://tnfasteners.com/
Flatheads were set flush to surface. #12 and 1/4" taper drill countersinks from
http://wlfuller.com/ will make fastening the screws a breeze. Especially thru the
fiberglass in the cockpit. 3/4" material is not thick enough to counterbore for plugs.
Fasteners to attach the coaming corners to the cabin were 1/4" hexhead lags
with fender washers in the aft corners of the cabin inside. 4x2.

It is of course very possible that coamings were adjusted for individual Ariel's
as they were being assembled at the Pearson works.