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I need to know more about the boat to make anything but general platitudes. Is it a known design that is published somewhere or can you give more particulars.
i wholeheartedly believe that...

It is unlikely that you will net an improvement in performance by converting a normally proportioned day sailer to bilge boards. It is, however, certain that you will improve performance by making a...

I would venture that some selective bracing inside the hull, which will be discarded, would permit you to cut out the centerline structure and permit you install the new stem and keelson for the new...

Well, it looked like a beauty, but I fear it would be faster and easier to start over. You could consider using this hull as a form to laminate 2 plies over, thus achieving something for your 150....

In spite of the above, I don't play with RC.
I prefer free sailing or "pond yachts."
I like rowing around in a skiff instead of standing on a dock with a radio.
The game is to get back to where...

Hard to argue that RC is dead. RC planes have been displaced by drones, and drones are everywhere providing aerial photography that amateur videographes and film makers couldn't imagine 20 years...

The Cricket is enticing.
As I recall these were sailed double handed with a sliding seat for the crew.
Rod Mincher writes about them o the earwigoagin blog.
SHC

I would reinforce the plastic suggestion.
King Starboard is easy to work with standard woodworking tools and will never need to be painted.
McMaster Carr and other online supply houses have an...

Take two Delaware Duckers:
Josef W built very well to traditional scantlings and sailed by Ben Fuller.
A Quartermoon Ducker- York model built of two plies 1/8" Cedar with normal dinghy scantlings...

I'm late to this party.
I think that materials and construction are the most significant contributors to the Planing Dinghy.
One reason why the 1890s sailing canoes were so fast is that the wood...

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We glued the new laminated ribs to the inside of the planking instead of Clinch nails or rivets There are white cedar wedges fairing the laps to improve the bond line. The deck is 1/4"...

I sprung for the Oneida Super Cell.
It kicks ass.
SHC

I hate to say "Why go to all the trouble," but seriously, what is wrong with the Shields or Etchells just the way they are?
Buy one and use it just the way it is and save even more money. I...

Sure, why not? It sounds like a solution for making bulkheads, so I'm not sure where it would be of use in a small boat.[/QUOTE]

Often the biggest problem is getting adequate stiffness. ...

Build something long and light.
Would you consider laminating piece of 1" XPS foam in between two pieces of 1/8" plywood. The resulting sandwich is almost as light as 3/8 plywood and more than 5...

It's probably worth going to some effort to get the board to pivot to a more vertical position. I'm not sure what you are planning for a pivot bolt arrangement, but perhaps it could be a two stage...

A word of caution: Adding weight is the fastest way to ruin a small boat design. So when substituting materials, be diligent about weight.
If you are building a boat for the fun of it and are not...

To figure out the size you need to know 2 things.
1) How fast you go. Velocity is a second order function so it has a greater impact than anything else.
2) How much side force you need to...

You may find this useful
http://www.paulzander.biz/centerboards.html
However he does not provide the guidance on determining how large your centerboard has to be. There is no doubt that it...

https://youtu.be/50uXPPt8-VI
Works a treat for bending a stack of thin plies at the same time.
If you are too impatient to let it dry out before you glue it together, use G-Flex or Gorilla Glue....

It's not as much stall angles as the low drag bucket.
Anyone who has replaced a flat sided board with properly shaped board will tell you it makes a difference.
Maybe not as much as having a smooth...

There are lots of options and actually finding the best section for your boat is a bit of an adventure.
12 % sections are a good compromise of strength/weight/ hydrodynamic efficiency. That being...

Consider molding a new skin using the hull as a fixture.
It will be marginally bigger but WTF.
Cut off the old skin and I bet you can tweak the new pieces into place.
SHC

Typically, boats shorter than 18-19 feet are poor sliding seat rowboats.
Reason 1 : A short waterline means their hull speed is too low, so you don't benefit from the additional power
A 17' Wl has...

Some advice on technique for rescuing boats without enough flotation.
Arrange it so you can strip the rig out of the boat. You need to have it so you can get it back, so it should have a tether on...

It was common for many Oz builders of light boats to cut the webs away from the skin in between the stringers, I think this was to eliminate a hard spot if the skin in between the stringers oil...

I would reef out the crack with something like a hacksaw blade until you get to clean wood. That should tell you whether the crack communicates with the outside. I would drill a hole at the end to...

Making nicely shaped wood centerboard and rudder is one of the most rewarding boat projects. You can make something beautiful that improves the way your boat sails. They aren’t very expensive either....

My Dad designed an eleven foot flat bottom sailing skiff in the 1940s. He thought it could be a smaller version of the Cotuit Skiff for racing where the water was really shallow. As the family...

Very Disappointing. All wrinkles and bubbles, but that is inevitable if you don't pull the separator tight to the surface.
I have always considered paper boats, and would like to know how to do it...

You can sail with all sorts of things being wrong. If the question is “does it matter if.......” then the answer is that you want to “lace” the foot of the sail to the boom. Loose footed sails...

Racelitehardware.com is your source.
SHC

I assume you mean the cheek pieces will be 5/8" and that there will be wood in the places the blade isn't.
I don't know what scale the drawing is. The blade above the pivot is going to be doing all...

I have laminated some planks out of 1/8" western red cedar with a ply of 300 g/m^2 +/- 45 flax fiber and epoxy in between the plies. This is for garboards and other places where relatively thin white...

Most boats I sail do not have turnbuckles on their fore stays. The usual arrangement is a swagged jaw on the cable with toggle to the chain plate, Small alteration in rake can be made by changing...

Never varnish teak. Not having to varnish is the whole point of teak. If you want brightwork, use mahogany.
SHC

Thistles were hot molded.
https://youtu.be/X6hgRQuvg60
Process was pioneered by Fairy Aviation during WWII. Firefly was designed by Uffa Fox to exploit this advance.
until the advent of cored GRP...

I am familiar with the Lightning but not intimate with all the details of the construction and how much variation is permitted in the Class Rules. If I remember correctly, there have been quite a bit...

“Stiffness” is pretty subjective. Everything bends the question is what is the correct amount. Racing sailors have an unquenchable appetite for stiff boats. Boats that absolutely do not flex in...

Classic 9.5 oz 7500 is not a bad choice. About 0.10 thick per ply. 1800 is the same 11x11 construction but the yarns are not twisted, so it’s slightly lower profile. If you can arrange to seal...

Performance:
Reduce drag. Build a smooth fair bottom and keep it clean. Minimize the hardware and crap that will disturb and disrupt the smooth flow of water over the surface.
Drag shows up in...

by "Biaxial cloth I assume you mean +/- 45 degree stitched fabric.
+/- 45 goes into and around corners much easier than 0/90 fabric.
I usually slice strips off of a roll at 45 degrees.
A sharp...

$750 Canoes are about like $750 Dutchmen.
Neither of them truly represent.
SHC

67495
If you like a Dutchman, you should get rid of those lesser boats and sail an International Canoe.
What Uffa Fox called the dry fly of Yachting.
Anything else is like kissing your sister.
SHC

Dave:
Sorry if I was unclear. I tried to go through the consequences of sheathing the hull with 9 oz glass. You said in a previous post that you didn't know how to calculate the weight, so I showed...

To clarify: do not glass this boat with 9 oz ( 300 g/m^2) cloth unless you want to ruin it.
SHC

Probably what has happened is that rig tension has driven the keelson through the bottom.
This has happened before to more than a few racing dinghies.
Rig tension went up in the 70s and boat that...

Closet poles and curtain rods are a fine starting place small sprits and booms.
SHC

Having a boat disappear beneath the waves is a sure way to ruin any day. If there is a way to avoid it, you should. That being said, open keel boats have been sailed all over the world for hundreds...

I hate it when this happens.
I assume this just happened, and that late July/August is pretty warm where you are.
Heat is the usual first option when dealing with thermoset resins that haven't...