Giveaway: refer the most builders by October 30 and win your pick from the store. How it works
boatbuildlog

Ultralight Dinghy · new build

Launched

-Ripple- Ultralight dinghy from scratch build

I have been thinking about a dinghy for my boat. After looking around for a commercial built dinghy under 50 pounds, found that I may have to build it. So I ordered the PDF files from Chesapeake light craft to build the ultralight 6 foot dinghy. I am going to build it from scratch with no kit, maybe save a little bit of money in the process. Hopefully I can keep the weight under 45 pounds.

Make a book Feed The whole log, 11 entries and every photo, laid out as a book to print, bind and keep.
11
Entries
212
Hours
n/a
Written up afterwards
42
Photos
Spent
Oct 2025
Started
Plans & Lofting 24 h Link

Transferring plans and making router templates.

I went to an architect to have the PDF plans printed out. Then I glue them to a thin piece of plywood to make templates for the router to follow on the finish planks later on.

Stitch & Assembly 24 h Link

Cutting planks from plywood, assembling, and stitching planks together.

After cutting out all the parts with the router. I carefully laid out all the planks in the correct order right, left, ins, and outs. I didn't use copper wire, I used less the expensive soft steel baling wire for the plywood stitches that I got from Home Depot. I used Tight Bond 2 to glue all the planks together instead of superglue. That's what I had in the shop, so I just used what was on hand. My wife helped me hold each plank and with the stitching. Then we celebrated the last plank with a shot of whiskey!

Fillets & Taping 24 h Link

Fillets and glassing the inside of the hull.

After removing all the stitches, the boat was strictly held together by wood glue only. I fill it at the inside of the planks with wood flower and resin. After grinding down the rough fillets on the inside. I laid out the 4 ounce fiberglass cloth on the inside of the boat. Taped off the areas that I didn't want to have cloth so I could cut it easier later on after the resin set up.

Glassing & Epoxy 24 h Link

Flipped the boat over, filleted all the board joints. Installed the 6 ounce cloth to the bottom and the keel. Built out the seat, trimmed, continued filling, sanding, faring, and all the stuff you would do to build up the finish of the hull before painting.

Glassing & Epoxy 18 h Link

Keel installation

This picture displays the keel after it was installed and filleted. I didn't cut a handle in my keel. Wanted to have the best tracking when I towed behind the boat.

What it cost

$848.06
$534.09
Into the boat
$313.97
Tools & gear
ItemQtySupplierCost
Chesapeake light craft digital plans One PDF file download Chesapeake light craft $89.00
Router bits 3 Amazon $58.56
Harbor freight, Palm router 1 router Harbor freight $90.94
3mm door skin plywood 2 sheets Home Depot $30.00
1/4 " sheets of birch plywood 2 sheets Home Depot $160.03
16 gauge wire steel 1 roll Home Depot $13.47
4 ounce fiberglass cloth 3 yards Amazon $21.39
Slow cure high UV resistant epoxy resin 1.5 gallon kit Fiberglass supply depot, Fort Pierce, Fl. $217.54
2" x 8" x 8' Western Cedar Plank 1 (picked up in damaged bin) half price Lowes $21.39
6 ounce fiberglass cloth 3 yards Family donation to project (free) $0.01
Non-waxed white gel coat 1 gallon Fiberglass supply depot $76.49
Rust-Oleum gloss almond enamel paint 1 quart Home Depot $18.62
Rust-Oleum gloss hunter green. 1 Quart Home Depot $18.62
Tape, paint brushes, rollers, misc. 24 n/a $32.00