Modding the front of a pontoon boat?

[kach22i]

Originally Posted by AeroMcAeroFace

I don't think this is any way relevant, water is about 1000 times more dense than air and so aerodynamics barely matter on a boat compared to water drag assuming a displacement hull.

100X's but your point is relevant.

[Kingofwylietx]

My current thought is to just leave the frond door open when feasible.

But now, with my newfound knowledge from you guys of how inefficient boats are at getting around, I'm wanting to learn more about hydrodynamics and how I might be able to make it more efficiently move through the water.

Considering how much more dense water is, then any small improvements would be amplified/magnified. I should probably pick up a Basics of Hydrodynamics book.

On plane, widening the lifting strakes at the back of the pontoons would probably help. For slow speed running, having the pontoons end in a boattail is probably better than the way they abruptly end now. I have some research to do!

[aerohead]

Originally Posted by Kingofwylietx

My current thought is to just leave the frond door open when feasible.

But now, with my newfound knowledge from you guys of how inefficient boats are at getting around, I'm wanting to learn more about hydrodynamics and how I might be able to make it more efficiently move through the water.

Considering how much more dense water is, then any small improvements would be amplified/magnified. I should probably pick up a Basics of Hydrodynamics book.

On plane, widening the lifting strakes at the back of the pontoons would probably help. For slow speed running, having the pontoons end in a boattail is probably better than the way they abruptly end now. I have some research to do!

I just went over to GOOGLE: US NAVY David Taylor Model Basin low-drag hull design.
There's a listing for :'An Assessment of Naval Hydrodynamics Science and Technology,' book.
These people do everything from nuclear submarines, to torpedoes. I can't vouch for it, but I trust the source!

[freebeard]

Just trying to be helpful:

duckduckgo.com/?q=An+Assessment+of+Naval+Hydrodynamics+Science+an d+Technology

Your choices for source include:

books.apple.com
play.google.com
w*w.nap.edu
w*w.amazon.com

(Expurgated to work around vBulletin nannying. Why it adds a space in +and+, I will never understand. Don't get me started on it's spell checker. )

My most favored hull design is the DDG/?q=M-hull. It's essentailly a trimaran, although the Bayliner variant appears to be a 'quintmaran'.

So it seems like you could add deflectors between the pontoons to nudge them in this direction. Essentially you'd promote counter-rotating vortexes between the central and outer pontoons, and then choke down the tunnel toward the rear to make that nice flat wake the M-hull produces.


https://toolmonger.com/wp-content/up...wake72-450.jpg

[Piotrsko]

I always thought the process was to clean up vortices and reduce the skin friction by having less hull contact.

[freebeard]

Quoth DDG:

Designing Ship Hull - What is M-Hull? - Bright Hub Engineering
https://www.brighthubengineering.com...ull-technolgy/
M-hull technology is an innovative development that uses a specifically M shaped hull to create an air cushion below the vessel in order to reduce the air drag. The M shaped hull captures the bow wave energy to form an air cushion, which thus reduces the drag.

M-hull: new thinking in boat design - Soundings Online
https://www.soundingsonline.com/news...in-boat-design
"The M-hull eliminates the speed limitations of displacement craft," says M Ship co-founder Chuck Robinson. "It's a major breakthrough in hull design because the more pressure is captured in the hull tunnels, the higher the boat rises out of the water, the faster it goes and the less draft it has."

[aerohead]

There used to be something called 'lamniflow' technology, but I can't find it online. I believe it was tested on torpedoes.
Riblet technology has been explored, derived from shark skin. Pockets of dead water are captured all over the submerged surface, and surrounding water touches mostly water on the Hull's surface.
The Russians use 'bubbler' technology, which introduces a layer of air bubbles along the hull's surface, reducing the amount of fluid actually in contact with the hull.
An extreme case is, the rocket-powered Russian torpedo, which shunts a portion of the rocket exhaust to the nose, and the torpedo travels as a full-cavitation device, never actually in contact with the water.
Other than all that, the other strategy is to raise the hull onto hydrofoils, lifting most of its surface completely clear of the water.