Hickman style hull any good for low powered outboard Houseboat?

[BlueBell]

Post #14, thank you.
I looked everywhere for it and couldn't see.

Stofferaus,
Why no barge?
It seems like a good solution.
I've been in 3' - 5' seas in mine with no problem.
But it's not really very comfortable above 2' chop.

 

[gonzo]

I've been looking at low speed displacement craft. Particularly barges. The radiused transition from the bottom to the transom is a distinctive feature. Might be possible to add a small sharp edge, right at the beginning of curvature, to allow flow to separate when approaching planing speeds, but small enough that the flow at very low speeds is mostly undisturbed.

25HP on a 30 foot houseboat is not going to get it even close to planing.

 

[DogCavalry]

25HP on a 30 foot houseboat is not going to get it even close to planing.

I understand that. But the otherwise supremely efficient sea sled form is only constrained by loss of efficiency from the submerged transom. And I'd be willing to bet that at some point a 100 hp outboard will get hung off that transom. Maybe an owner wants to relocate at 25mph instead of 5, so they borrow the bigger engine for a day.

A 30 by 8 sea sled at the OPs SOR upper weight limit is only at 5¾" (15cm) immersion. Bevelling off that immersed area at a barge like angle only requires a 12" bevel. If that transition has a sharp edge like a disrupter, the boat has it all. It's the best at everything. And the cheerleaders rush the field for smooches.

 

[DogCavalry]

Man! That Dog guy sure loves sea sleds!

 

[Mr Efficiency]

I don't know what the cure is.

 

[bajansailor]

Everything is always a compromise with boat designs, and some are better compromises than others.

Sea sleds do have a lot of attributes though, along with the inevitable compromises.
Way to go John - I just wanted to say something so that I am reminded of future posts on here.

 

[DogCavalry]

I don't know what the cure is.

We already know it's not more cowbell, because we tried that.

 

[BlueBell]

I understand that. But the otherwise supremely efficient sea sled form is only constrained by loss of efficiency from the submerged transom. And I'd be willing to bet that at some point a 100 hp outboard will get hung off that transom. Maybe an owner wants to relocate at 25mph instead of 5, so they borrow the bigger engine for a day.

A 30 by 8 sea sled at the OPs SOR upper weight limit is only at 5¾" (15cm) immersion. Bevelling off that immersed area at a barge like angle only requires a 12" bevel. If that transition has a sharp edge like a disrupter, the boat has it all. It's the best at everything. And the cheerleaders rush the field for smooches.

8800 pounds sailing / 1000 pounds lift per inch = 8.8 inches draught
John , could you show your calculations please, as I get 50% more draught than you.

Also, your "supremely efficient" sea sled hull is constrained by greater wetted area than a barge because of the catamaran style hulls forward.
This would be exaggerated in displacement mode like we're talking in this thread.

 

[DogCavalry]

On checking my math, I got the same answer you did.

Increased wetted area forward would be the case. The improved resistance to chop may be a higher priority than the increase in fuel consumption.

 

[DogCavalry]

https://www.google.com/url?sa=t&sou...FjAZegQIFRAC&usg=AOvVaw1ojhvTxw_s5A-A-zvPW7KO

Some great material on barge forms, their yaw stability and drag vs displacement. Excellent detail about ends.

 

[BlueBell]

Our new friend, Stofferaus, is having a hard time navigating the Forum.
I PM'ed him and this is his reply to post #31 above:

"Sorry I’m new and not sure how to his come up. If it’s my thread or whatever it’s called, I’m not wanting a barge hull on a light weight trailable houseboat under 2500kg. Hull possible aluminium and upper structure fibreglass covered foam panels. Whole thing 3000 mm x 10000mm, with 1000 deck out the back and 2400 mm deck with roof over deck out the front. Don’t want a barge hull because although low powered with 2 x 25 hp outboards, I would like to handle some choppy water. 10-15 knots with 1000mm or 3’3” waves.Was thinking Cat hulls or Hickman Sea Sled type hull."

BB

 

[Mr Efficiency]

For starters, 2.5 m is the legal trailing width, 10m simply won't come in under 2500kg, so a bit of revision of ideas is required.

 

[BlueBell]

For starters, 2.5 m is the legal trailing width, 10m simply won't come in under 2500kg, so a bit of revision of ideas is required.

Read the post, man, 2400 mm is 2.4 m which is LESS than your legal limit of 2.5m.

On what do you base your gross assumption that he's not getting in under 2500kg dry weight?
Did you read his premise?

Not very constructive input for a guy who's struggling here Mr E.
I find you careless at others expense.
Perhaps you just don't realize it.

 

[Mr Efficiency]

Are there two different people here who want a houseboat on a sea sled ? The only fella I saw, was wanting one that would be trailable under 2500kg. 3000mm x 10000mm is not practical to trail, and certainly won't come in under 2500kg on the trailer, so where am I wrong ?

 

[Mr Efficiency]

*crickets chirping*