Hull shape: what’s the consensus on extreme piercing/displacement/planing combo hulls for sailboats?

[Kingston]

Hull design can get ridiculously complicated, fast.
And sometimes it's completely counterintuitive!
Unless you are willing to put in a lot of time and money
in experimenting, trialing, modifying, rebuilding, changing, analysing,
pulling your hair out, losing sleep, regretting, giving-up, spending more money,
starting over, etc, etc, etc then look at hulls already made, tested and proven.
Hulls with thousands and thousands of hours in all kinds of conditions by all kinds of skippers.

From these you can see what meets your SOR and how.
Perhaps a mix of hull designs, meaning a prototype needs to be made and sea-trialed.

In the end you may look back and say, "Why didn't I just buy a production hull that best suited my needs?"
Often it's because you didn't know any better and had an agenda...

Carry on.

I'm hoping to keep things easier by working on a small sailing dinghy. Perhaps plywood would be a good choice for cheap hull experimentation?

 

[upchurchmr]

Plywood is great.
Do you know anything about working it?

Some Naval Architect will have a better suggestion, but why don't you buy one of the books by C. A. Marchaj.

Then order a set of plywood boat plans for a 12 - 15 ft boat, and build it.

Try to understand the boat you built in terms of the book.

Then think about reinventing the world.

Commenting about your drawing.
The wide/ fat displacement section is way too short. The aft slope is too steep.
The flat aft section will do nothing since sailboats heel, and the only thing left in the water will be a triangular section way off to the leeward - so there will be no planing.
You need to figure out how to determine what the bouyancy of your hull is. You have way too much in the front and too little in the back.
Just imagine what would happen if you actually sat on the boat in a normal position - the stern would be underwater.

TANSTAFL - there is no such thing as a free lunch.
Even with plywood you are going to spend plenty of money. If you use the cheapest you can count on it not lasting very long.

What 16' boat were you sailing on?

 

[BlueBell]

I'm hoping to keep things easier by working on a small sailing dinghy. Perhaps plywood would be a good choice for cheap hull experimentation?

Plywood is excellent.
Stitch-and-glue is easy, strong and light.
Google it.

 

[Dolfiman]

I'm hoping to keep things easier by working on a small sailing dinghy. Perhaps plywood would be a good choice for cheap hull experimentation?

In case of, you can also be inspired by this dinghy design, Kitoo simple , a DIY but with a sophisticated plywood structure to make a light rigid hull (all elements being carefully computed and cut), with a modern hull shape as you would like, and finally easy and fun to sail, stable enough for all level of skills : Kitoo Simple : le dériveur en kit plein de sensations http://kitoo-simple.com/