# River Roller! Pontoon Boat that Rolls Across the Water!

Discussion in 'Boat Design' started by Matthew Lee Towne, May 10, 2017.

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## Do you think the River Roller will work?

1 vote(s)
2.4%

34 vote(s)
82.9%
3. ### Maybe

6 vote(s)
14.6%
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### rwatsonSenior Member

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### Angéliqueaka Angel (only by name)

It looks to me like Rolligons only do OK in the water as long as they're driving on the bottom, the tyres look to have to little volume to float the vehicle, and when having enough tyre volume to float, then they would need a prop for propulsion I think, it seems to me they were only off highway transporters, without the ability to float...

Last edited: Jun 18, 2018
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### Angéliqueaka Angel (only by name)

The pressure on the ground and on the people the Rolligons drive over is the same as the pressure inside the tyres, for the Rolligons according to the first post #302 link this is 5 pounds per square inch = 5 psi ~ 34.5 KPa ~ 34,500 N/mm² ~ 0.345 kg/cm² ~ 0.345 bar

The carrying capacity of the tires without pressure left out of consideration, in my view the tyres flatten and spread out over the carrying surface till the pressure under the tyres equals the pressure inside the tyres, the exposed surface of anything under the tyres can be measured or estimated, from which the load on the item (e.g. a body part) can be calculated.

P.S. - tyre inflation pressure from post #304 & #305:

2 pounds per square inch = 2 psi ~ 13.8 KPa ~ 13,800 N/mm² ~ 0.138 kg/cm² ~ 0.138 bar

Last edited: Jun 19, 2018
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### Angéliqueaka Angel (only by name)

Here it says at 0:32 . . . . ‘‘needs only a few pounds air pressure’’ . . . .

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### Angéliqueaka Angel (only by name)

About the buoyancy, vehicle weight 3,000 pounds = 1,361 kg, if the 3,000 pounds is correct, then I'll guess that goes unladen for the above Jeep model . . ?

If the correct tyre sizes are given, then the buoyancy with the tyres fully immersed is:

Tyre size: L (5') 1.524 m × Ø (') 0.762 m = (24.54) 0.695 m³ per tyre​

Tyre size: L (9') 2.743 m × Ø (') 0.762 m = (44.18) 1.251 m³ per tyre​

Last edited: Jun 19, 2018
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### Matthew Lee TowneSenior Member

FASTEST BOAT EVER?

Hello All, I apologize for not posting for awhile. I just haven't had the time or attention to give to this forum.

It's clear to me that many of you believe I am making audacious claims. While I think my initial design is viable, I don't think it is the best version for a prototype.

That being said, please see the attached. Lets call it the River Racer. I believe this concept could become the fastest boat ever. Not to mention a very achievable prototype. I know why. I think its clear I'm a glutton for punishment. So I will ask the question. Why does this concept have the potential to be the fastest boat ever?

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### Angéliqueaka Angel (only by name)

There's just one word too many in the question.

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### Angéliqueaka Angel (only by name)

If you think the concept has the potential to be the fastest boat ever, than try to explain why you think so, and you will self discover the fallacy of the composition if you understand what you're talking about, which alas you don't as you've proven on the thread.

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### BlueBell"Whatever..."

I know why, because it looks like the fastest boat ever!
Well, it looks like the fastest pretend boat ever.

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### JSLSenior Member

Prove everyone wrong: build a scale model (1:10) and do some testing to help understand some basic laws of physics. Treat it as an AATV ( Amphibious ATV) and be satisfied. If it achieves 10 knots (on water), so much the better.
If you look at similar military craft, the faster ones have propellers and retractable wheels

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### JamesG123Senior Member

"Audacious" isn't the adjective most would use.

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### BarrySenior Member

mmmmmm??????

Mind you, with a scaled up a full size, you might need to be doing 200 mph and not sure whether they could start in the water

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### cracked_ribsSenior Member

Simple: because anything which never leaves the realm of fantasy has zero mass, and consequently has no restriction on achieving the speed of light. It could even be faster than that!

I am already wearing the fantasy medal I won for my correct answer. It has the potential to be the most valuable trophy in history.

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### Matthew Lee TowneSenior Member

Thank you Barry for the post. Yes, this is a hypothesis, though I think Barry's videos provide proof of concept. So long as the trantoons are not submerged deeper than the axle, I expect it will be able to rise up and skip across the water. I believe that superior control will allow higher speeds. Imagine a wheelless vehicle skipping along the road VS. a vehicle with wheels. Which will be capable of higher speeds and superior control? I am pursuing a to scale prototype based on this. Would anyone be interested in helping? I'm sure some of you would have to be interested in setting the world speed record on water. I know I don't have to say this, but........let me know your thoughts.

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### Matthew Lee TowneSenior Member

What military craft are you speaking of? I haven't seen any high speed, full scale craft along this line of thinking.

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