Blowhards Sailing Downwind

low bridges, oil is still cheap. "almost" isn't "always", water is harder to work with than tarmac.

:) unfotunately it's wasted on most widers users as they don't have the fonts installed

hmm, there's a section of unicode for fractur:

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Interestingly google understands it but google translate does not :)

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the force comes from the propellor.

Not accelerating. If the truck moves at a constant speed, the car moves at a constant speed, which is faster than that of the truck, and thus continually moves further ahead of the truck.

From the propeller.

Correct. It's *extracting* energy (which is being provided by the truck), not creating it.

The wind-powered vehicle has no sail. It has a propeller.

The reason is that a sail can't extract power from a wind whose velocity (speed and direction) matches that of the vehicle. A propeller *can* extract wind power under these circumstances.

The propeller-driven vehicle takes some power from the wheel and uses this to extract *more* power from the wind.

Think of it like an electric generator. The big ones that are used in power stations don't use permanent magnets; both the rotor and stator have coils.

In order to extract power from the stator windings, the coils in the rotor must be powered. Once the generator is producing power, you can obtain the power for the rotor coils from output of the generator itself.

The generator produces far more power than is necessary to power the rotor coils. This isn't a "free lunch", as the generator is taking energy from the turbine. But it has to use some of the energy it produces to power the mechanism by which it extracts that energy.

1. Now extract more power from falling water to make the turbine turn faster than the water pushing it.
2. Use some of that extra turbine speed to pump some discharge water back up to a higher level, bringing turbine speed back to normal.
3. Release the water that you raised, to power more turbines.
4. goto 1.

Most turbines are axial-flow, which can move much faster than the fluid (in much the same way that you can sail perpendicular to the wind much faster than the wind).

Define "normal". In any case, there's no problem pumping "some discharge water up to a higher level". You certainly won't be able to pump *all* of the water back up to its *original* level.

What's the point? The energy obtained from the additional turbines would be less than that taken from the first turbine to pump the water.

But that has nothing to do with the propeller-cart.

Right. People keep confusing the BeanieMobile with perpetual motion. The BmB is wind powered. There's no free energy, no violation of conservation of energy.

John

Those of us who don't sail can liken it to sgueezing a watermelon seed to make it shoot out from between our fingers.

There's free force, apparently.

Nobody (not Nobody, nobody) yet has anything to say about the windmilling propeller. Hmm.

Yes, force is not conserved. A 6-year old girl can lift a truck with a good hydraulic jack.

It's a pusher prop, not a windmill.

John

LOL Pusher or tractor makes no difference at all. Until you start powering it, it's a windmill. And the tailwind is turning it the wrong way. I guarantee. Go play with a small fan, one you can spin by blowing into it.

And the truck will go up slower than the jack handle goes down. She doesn't get force for free, she trades velocity for it.

In that the air is free and the wind is made of the air yes there is.

it doesn't take much force to maintain the speed.

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--- But it _is_ powered. By the tailwind.

Think of it like this:

1. First of all, the wheels are geared to the prop so that when the cart moves forward the prop will turn counter-clockwise (from the video) when looking into it from the front of the cart.

1. If there's a headwind the prop will be acting like a windmill (turbine) and will turn the wheels so that the cart heads into the wind.

2. If there's a tailwind, the drag from the prop (and whatever else there is for the wind to push against at the rear of the cart) will cause the wind to push the cart downwind, which will make the wheels turn in the direction to cause the prop to rotate CCW, just as if there was a headwind.

Now, since there's no headwind and only a little resistance in the drive train (including the losses at the wheel/road interface, the tailwind will cause the cart to accelerate, and the prop to spin faster and faster as the cart hurtles down the track.

Eventually, when the cart reaches wind speed and is no longer being pushed by the wind, the thrust from the prop will drive it into the wind and, eventually, the prop will turn into a turbine and from 2, above, will extract power from the headwind and feed it to the wheels, which will keep the cart heading into the wind at the speed where the power extracted from the headwind will equal the cart's losses.

That's my take on it, anyway...

---

--- But that's not how the cart's wired. See 1, above.

--- JF

That's a windmill.

That's wrong. With a tailwind, the prop windmills CLOCKWISE when viewed from the front. The car will BACK UP into the wind, just the same as it goes forward into the wind in 2. above. The car is simply turned around!

The Miracle Propulsion System has a wheel and a propeller fighting each other whenever the wind blows.

It's a contradiction. Imagine the car is symmetrical, no front or back, just a box on wheels and a prop on the roof. In 1 and 2, it's wired to push the car upwind. In 3, it's wired to push downwind.

John Fields wrote: >

I hope you're using gears, shafts, chains and sprockets, visible stuff.

I've been working on mine! :^) Nothing I have the nerve to present yet, but it's real simple - the wheel is a pulley, there's another pulley on the propeller shaft, and there's a twisted belt between the two. That's all it takes.

It looks like as the car goes faster, the wheel goes faster too. And then the propeller goes faster, so the car just keeps going even faster. This is scary.