Weirdest propulsion system

[SamSam]

This is weird...

When a cylinder rotating around its own axis is exposed to an airflow moving at right angles to that axis, the cylinder experiences a lateral force that acts at right angles to the airflow and the axis of rotation. This force is known as the Magnus force after its discoverer.

Seen from above, the phenomenon appears as follows:

A vertical cylinder rotates clockwise

The wind comes from the West (left)

The Magnus force pulls the cylinder to the North (above)

http://images.google.com/imgres?imgu...a%3DG%26um%3D1

[kistinie]

Originally Posted by Guest20100203

Kistinie, do you ever have anything literate to offer a thread? Is it a translation issue?

No, Nothing ;-)

Rotor boats are not as crazy as it may sound.


The first boat equipped like this in 1926 crossed Atlantic via south America.
Reported speed was 4 to 9 Knts

One of the last try was in 2008 on a 130 meters cargo built by Lindenau-Werft shipyard in Kiel.
Any news of this boat?

In 2009 the Finland-based maritime engineering company Wärtsilä unveiled a concept for a cruiseferry that would utilise flettner rotors as means of reducing fuel consumption.
http://en.wikipedia.org/wiki/Rotor_Ship

More on Magnus effect (also used in Boomerangs and golf balls)
http://en.wikipedia.org/wiki/Magnus_effect

[powerabout]

also used on stabilisers on high speed craft ( like 20+knots) but in the water

Just for interst sake,,how about a 80m vessel that uses Voith Schnider thrusters as main propulsion????
ALL electric too....

I hope to have a job on that soon

[jehardiman]

Originally Posted by CDK

I've never really seen it, but there is a European patent granted to a lunatic who puts the outboard engine inside the boat in a sort of long tub. The water expelled by the prop flows forwards on both sides and returns to the prop.
The inventor points to the advantages, such as using clean or distilled water to prevent growth on the prop and easy maintenance. He claims the innovative propulsion can also be used for trains, planes etc.

It clearly shows that proving something stupid will work by pointing at a granted patent in fact only proves you are not the only idiot around.

You know, depending on how it was set up, it may work....not very efficient, but you can make inertial proplusion systems.

http://books.google.com/books?id=B-M...d=0CBwQ6AEwBQ#

[CDK]

Originally Posted by jehardiman

You know, depending on how it was set up, it may work....not very efficient, but you can make inertial proplusion systems.

Yes, you can move a small boat by shifting your body weight or running back and forth, fast in one direction, slow in the other. The math is complicated, keywords are mass, delta V and friction.

There are machines to compress and polish a fresh concrete floor in factory buildings so it needs not be painted, yet absorbs no oil or water. Some sort of wide cast iron sledge with a counterweight, engine and cabin spring mounted on top of it. No drive train, no wheels, just a hydraulic system to change the angle between sledge and counterweight. The driver has a control stick and a throttle pedal and can move the vibrating heavy machine in any direction.

By converting part of the energy in one direction only from kinetic to thermal by applying local friction, the resultant vector in the other direction is larger and can propel a vehicle.

[Boston]

obviously you guys have not had the always exhilarating experience of operating a large rotary floor sander with say a 40 grit paper on it
you control the direction by adjusting the angle of attack
assuming you dont dig a hole in the floor first that is

sane basic idea as above I just never knew what it was called

[CDK]

Yes Boston, the same principle.
You could even move your boat with it as long as there is any floor left.

[peter radclyffe]

Master Whisk, Variable Speed, Whisks Up To 5 Gallon, Beats Up To 50 Eggs
Dynamic International - Model 048-FT97
SKU: FT97
Shipping Weight: 10.00lbs.

[SamSam]

How about a lifesize putt putt boat? Maybe a full size one powered by baking soda?

[baboonslayer]

I have a weird one that I just thought of. Might not work, don't really care anyway. This idea for an almost perpetual motion motor popped into my head...

it is pretty simple. The same pole magnets repel, creating a force offset of the crankshaft, creating rotational energy.

another weird one to try is to put a rudder on a small boat, preferably a wide bladed one, and attach to the stern etc., then try moving the tiller handle back and forth so the rudder flaps like a fish's tail. The boat should move forward. (this might actually work ).

[hoytedow]

http://www2.ed.gov/pubs/parents/Science/soap.html

[troy2000]

Originally Posted by baboonslayer

I have a weird one that I just thought of. Might not work, don't really care anyway. This idea for an almost perpetual motion motor popped into my head...

it is pretty simple. The same pole magnets repel, creating a force offset of the crankshaft, creating rotational energy.

another weird one to try is to put a rudder on a small boat, preferably a wide bladed one, and attach to the stern etc., then try moving the tiller handle back and forth so the rudder flaps like a fish's tail. The boat should move forward. (this might actually work ).

Ever heard of sculling?

I've moved small boats short distances by working the rudder the way you describe. But it won't get you very far very fast, for the amount of work put into it.

[SamSam]

Originally Posted by baboonslayer

I have a weird one that I just thought of. Might not work, don't really care anyway. This idea for an almost perpetual motion motor popped into my head...

it is pretty simple. The same pole magnets repel, creating a force offset of the crankshaft, creating rotational energy.

another weird one to try is to put a rudder on a small boat, preferably a wide bladed one, and attach to the stern etc., then try moving the tiller handle back and forth so the rudder flaps like a fish's tail. The boat should move forward. (this might actually work ).

I believe you've just invented sculling and the electric motor. I too believe they might work.

[dieseldude]

Weirdest engine I ever worked on was a Deltic in the old "Nasty" type patrol boats.