Search results

I am planning on doing a roll period test tomorrow. I will use slow mo video to measure roll period in seconds. I have 540 lbs of removeable ballast on the boat now. See this gallery: New Keel, Who Dis? | Boat Design Net I know that the roll period should be between 1 an 1.1 times the "beam...

I'll be making LOTS of backing plates and spacer plates as I redo the hardware on my conversion project (see thread in design forum). I figure I'll be cutting 50+ donuts out of fiberglass with a hole saw using a pretty heavy duty drill press. I'll be cutting 3/8" and 3/4" thick fiberglass /...

Hi folks! Looking at various displacement power boat hulls I see flat stern bottom extensions on many of them. I assume these are designed to be near the waterline? Just under? Example: I understand that immersed transom area increases displacement speed drag. When these are at the...

As described in other threads I'm taking a 5200 lb displacement deep keel sailboat (Pearson 26) and removing the 2200 lb cast iron keel to create a displacement speed electric cruiser. No sails. The hull of the boat is *relatively* flat bottomed. I'll be making a fiberglass keel to replace...

Hi folks! As I mention in another thread I will be building a large (1 ' x 12' ) fiberglass keel insert for my sailboat to electric cruiser project. I've done small fiberglass jobs before, but nothing this size. I have seen lots of tips in videos that shows applying one "batch" of fiberglass...

So, my understanding of multi layer polyester laminations in a mold is that the final layer needs wax or another air barrier to cure. But how exactly does that work with wax? You mix it in. Does it then float to the top to form a barrier? Buuuut.... you also use wax as a release agent in the...

Hi folks. As part of my project - Project Log - New Keel, Who Dis? (Pearson 26 to Electric Cruiser) | Boat Design Net - I need to build a new keel and insert it into a slot about 86" x 12" x 1" deep. So I need a plate about that size, and I want a 4" x 4" x 120" keel underneath that as a place...

The Requirements: Electric power for quiet and serene propulsion. Capable of 6mph with electric power. This is the maximum speed in the harbor I am usually in. Capable of carrying 8 adults for a cocktail party. Can be helmed from the rear of the cockpit so the captain can converse with the...

I'm doing a conversion of a Pearson 26 sailboat into an electric powerboat. I noticed that the lifeline stanchions are inset inboard. I've started a gallery album to show what I mean, but I guess my photos need to be approved? Anyways, is there a reason they are inboard an inch or so, rather...

I'm replacing a cast iron keel with a short steel keel as part of my conversion of a Pearson 26 One Design to a slow solar cruiser. The keel with be 3" or 4" thick plate with bottom tapped bolt holes. The closed tapped holes will allow me to remove / inspect / replace bolts one by one while...

I'm building a solar powered slow cruiser. I'm working on a design for the canopy. Large flat glass panels (though heavy) are 1/4 of the price of flexible panels per watt. The canopy will be about 8' x 10'. I was thinking an aluminum frame combined with FRP sheets with the solar panels on...

I'm looking to turn a Pearson 26 One Design from a full keel sailboat into a shoal keel electric displacement powerboat. Yes, I know that is a odd approach, but the cabin and the cockpit and the price match what I am looking for. It is clear that other sailboat conversions to powerboats have...

I want to see if I am understanding basic hull design correctly. I want to build a 20' to 22' cat for electric propulsion. I want to make sure I am understanding the order of importance for efficient design, but I want to make this a VERY easy to build cat. 1) Make the hulls long and light -...

Hi all! I'm working on a boat design, and have some (many!) questions. Background: I want to build a displacement power catamaran or trimaran of about 20 to 22 feet. It will be in the ocean and if I finally get a #$%$% mooring it will be moored. While I love the idea of an HDPE boat, and...