design feedback

This boat is teaching you a great deal in the flesh. It is worth it's weight in gold. After you find the short comings, I am sure the girls wiil love it to death. Knowledge and happiness in 1 boat. Put a VHF radio in for safety and the girls will MAYBE, see you for meals.------------ I am assy. a 2 seat gentleman's racer. 19' X 4.5' constant 28 degree deep V with a vertical bow. Compare notes next spring - summer. It has the hull form of a small Thorney Craft PTB, (British).

 

I thought I'd posted a reply on this thread, but obviously I didn't... The outdrive should have some trim mechanism, if it doesn't or it's at max travel, try moving some weight right up to the front and see if that makes much of a difference. Run-abouts usually were in-borad mid-enginged boats, so many tend to have a lot move volume at the bow than modern powerboats (aft-engined). If you can't move enough ballast, then fit the trim-tabs, but tabs are not usually added to a stern-drive boat to get it planing.

BTW, cyclops, are you sure you mean 28 degrees??? 0 to 8 for a run-about, 18 to 22 deep V, but no more than that.

by the way, there is a good discussion on design features at

http://forums.boatdesign.net/showthread.php?t=8468

and

http://forums.boatdesign.net/showthread.php?t=8468&page=5

for a picture of a nice deep V varying deadrise hull.

Tim B.

 

It is a 28 constant V. Extreme, yes. I decided I wanted something that did not buck back on a choppy day. 350 Chev, a trans, shaft and a prop followed by a DEEP spade rudder to stop the bow from hooking. I will line up a Jersey Skiff driver for the first couple of flights. They are the drivers with the best steering and handling reflexes alive.

 

Something was mentioned about the tumblehome being a tad much. Here are a couple that meet or exceed (first and last pics).

http://duckworksmagazine.com/05/columns/max/11/index.cfm

Steve

 

That's your first cut? Very impressive! How did you model the shape and get such smooth, accurate cross sections?

An aesthetic comment - the transom I agree with making it less semicircular, and I think would also look nicer with the vertical being less vertical - sloping either forward or back. There should also be some taper in width of the transom down towards the waterline. From the transom forward the boat is so sleek - you need to match that to some extent at the transom as well for the styling lines on the whole boat to flow together well - right now it looks too abrupt, like a different boat right at the transom.

All that wood looks beautiful - cannot beat wood as a material for elegant appearance.

 

Just a quick update, the stern drive is gone! Never again will I deviate from my original idea (to save money). I'm converting to an inboard. And yes I'm going tone down the tumblehome. I will post picks when its complete. And thank you all for your replies.

 

Shelman makes a very good Okoume plywood, BS1088, Lloyds serticate, 15 or 25 years warranty, fungicide in the glue.

Se this discussion, Shelmarine vs Bruynzeel:
http://www.woodenboat-ubb.com/cgi-bin/UBB/ultimatebb.cgi?ubb=get_topic&f=1&t=010227&p=

 

uuups answered to the wrong thread

 

update

Here's a couple of photo's taken earlier this summer. Your suggestions made all of the difference. She is now sleek and smooth.
Than you all!
Anymore suggetions?
She should be complete spring of 07'

 

Looks great! I like the the windshield. Do you have a better picture. Where did you find it and the chrome rub strip. I'm in the midst of a similar project.

 

LP,
The windshield frame is a riviera reproduction I bought off of ebay. I'll take some close up pictures. The stainless is from a 36' Chris Craft that is being salvaged. West marine offers a hollow back stainless at a resonable price but if you can find an old chris that is being broken up that's your best bet. The solid backed stainless I'm using cost me about 50 bucks. Do you have any pictures of your project?

 

You have a beautiful boat. I think that you have received some excellent comments, but, in the end, it is your boat, your bit of artistry. I notice that you commented twice that you wished it were more of a deep "V" design. If you plan on repeating the build of this boat multiple times, you might want to change that. Of course, a deep "V" will take more power. What is the angle of deadrise at the transom? I like the tumblehome and deck camber but find an overall elliptical shape more pleasing than your almost circular transom. Changing the deadrise (which will also affect the bow shape) and relative dimensions of the transom may be more than you want to undertake. It is a nice design already. Your posting has encouraged me to get back to work on a runabout design I have been considering. Thanks.

 

Ieagreg1,

Sorry to take so long in getting back to you. Here are some pics. Hope to get it wet this summer, but I'm afraid the finances will make me wait another season.