Double end power boats?

[Marko]

Squat boards

To all,

How many of you remember the use of squat boards on traditional Chesapeake Bay workboats. Chapelle mentions them (I have forgotten where) and there are also some illustrations in Harry Sucher's books on Simplified Boatbuilding. This idea should be given some thought. Since they could be employed like trim tabs, they would be most effective as speed increases, dynamically eliminating settling of the stern as planing speeds are approached.

Comments?

 

[gonzo]

They call them "hobbles" locally. They developed to correct the squatting on sailboat hulls converted to power.

 

[Tom Lathrop]

I guess that I'm the outcast here since I like the look of properly proportioned transom sterned boats. I do see some "double enders" that appeal but many seem to look a bit forced. Tad is certainly right in that the shape of the stern above the water has nothing to do with the boats performance, displacement or planing. It's all in the shape under water. The traditional double ended pangas of Latin America grew the under water wings, whatever they are called, in order to take the large outboards that they now use. Calkin's Bartender is often fitted with these also in an attempt to keep the stern from squating so much when planing.

If a boat is to plane and be efficient doing it, it must lift the forward hull out of the water to decrease wetted surface. This requires that the stern be depressed to take an efficient trim angle to develop adequate dynamic lift to support the weight of the boat. A true double ender is not going to like this since there is insufficient lifting surface back there. Planing double enders do so in spite of, not because of, the pointy stern.

Long narrow boats with double end bottoms like Weston Farmer's Coyote are designed to make reasonably high speed in the upper teens and are very efficient doing it. I doubt that anyone could be a success at selling such a boat though. Martin's Energy 48, built during the 70's fuel crunch, was a good example and like the Memory, it did not sell.

 

[Willallison]

I guess that I'm the outcast here since I like the look of properly proportioned transom sterned boats.

...nope - or if you are, we can cast out together! I hate powerboats with pointy bums - except for a very few heavy displacement passagemaker types

 

[gonzo]

Flat bottom double enders with no rocker plane well. However, you got to withstand the pounding. It is not as bad as on a skiff.

 

[waterman]

Double enders do plane

I saw that statement and was surprised. Has every one forgotten the designs of George Crouch? Baby Bootlegger and Typhoon were both double enders! (Although I'm not sure if they have stepped bottoms or not....(which might be considered cheating)).

 

[djwkd]

Hi-my friend would like to build this boat so i need to ask the specifications and if you could give me free plans!!!!!!!I Also hope that this post will bring the thread to life.PS:sorry if this is a double post!

 

[SC1]

The double end power boat, where has it gone? We all have a dream boat that we work on back in those dark spaces in our minds. Well my dream boat is a double ender. Something like SailDesign’s, Myrddin . Now I’ve never been one to follow the pack, but with as much time as I spend looking at and reading about boats, I find very few power boats with two pointy ends. Is there a valid reason for this or is this another case where the cost per foot of dock has driven design changes.


Gary

What do you think about this Miss?

 

[FAST FRED]

Tad And Tom are right , boats are sold by the LOA /visable internal room equation.

Efficient long slim boats are out of style as slip space is sold by the LOA , not sq ft of boat.

So the 40loa by 22 beam is a winner in the market place. To move it requires massive power , so "mine is bigger than yours" power rating , is a plus for the dockbound boat owners.

Actually the boats "owner" is a bankster some place that allows the purchaser to operate the boat between payments.

How much it "Costs" is never the question , "how much per MONTH " is.

This probably wont change very much during our lifetimes.

If you want to see efficient boats , look on a mooring , not dockside, as a knowledgable owner has no need for the power hose, and its expenses.

A mooring can run 1/20 to 1/50 the expense of a slip, or less, and LOA is no problem.

FF

 

[Guillermo]

Gary;

It's that boat manufacturer's (not boat builders) are selling interior volume. This means that your product is actually more ugly than the next guy's, but, look at all that interior volume. This sells at indoor boat shows, where you can't even look at the boats exterior. It also sells to people who have no historic context for what a boat should look like.
....Very few builders understand selling exterior looks.... But the pressure to pump up the interior is fantastic.
....Good looking boats that perform as they always have are very difficult to sell.

Big and sad truth!

 

[djwkd]

Does anyone KNOW the specs???(sorry about caps-im on quick post and can't do italic)and does anyone actually HAVE the plans????

 

[tom28571]

Does anyone KNOW the specs???(sorry about caps-im on quick post and can't do italic)and does anyone actually HAVE the plans????

It might help if it was known what you are asking about.

 

[Willallison]

Ok - so not [Iall[/I] double-enders are butt-ugly (pun intended, sorry...), SC1 has proved that.

If you want to see efficient boats , look on a mooring , not dockside, as a knowledgable owner has no need for the power hose, and its expenses.

FF - I beg to differ. Just because you can afford the convenience of a marina berth, doesn't mean you aren't a knowledgeable owner

 

[kerosene]

old thread however I'll drop in

you can find lots of photos from google searches with merilainen + vene (boat in finnish) (meriläinen is correct) or fiskari + vene or retkivene

This type of boats are fairly common family boats in Finnish coast and lakes. I think they are still being manufactured and they do have pretty strong following.

example:
http://www.mikavanhala.fi/venesivut/veneet/kiiski01/

 

[Pericles]

Tom,

Re your post of 27th May

djwkd is the tyke on Tyneside who wants to drift on a raft.

http://www.freewebs.com/raftbuilders/

He last posted on 20th July leading me to think he set off on his adventure, with predictable results.

Let's hope he sees this post.

Pericles