Rand Cam engine

[Bruno Ogorelec]

Here's an interesting take on the rotary piston engine -- reportedly very close to practical application for the military:

http://www.regtech.com/index.php?pg=8

Bruno

[cudabean]

Yes, I've been keeping my eye on that one. Here's another rotary that's interesting as well. Invented by a Turkish guy:

http://www.idolmotor.8m.com/

It's a little hard to comprehend--even with the animations, which may ultimately be detrimental to acceptance of an otherwise workable design. The neat thing about it is there's almost no friction, just a slight low speed sliding of rounded surfaces withing the compressor and "turbine"

cudabean

[Bruno Ogorelec]

Jesus, is there any way to slow down the pesky animation? My head spins. Offhand, it looks like a version of a vane-type compressor, but there's obviously an additional twist in there.

Bruno

[Mark]

Jesus, is there any way to slow down the pesky animation? My head spins. Offhand, it looks like a version of a vane-type compressor, but there's obviously an additional twist in there.

Bruno

Don't know if this has been posted before, but here it is, a squidly looking water pulsejet.

http://www.delphion.com/details?pn=US04057961__

Mark

[Bruno Ogorelec]

Mark,

I think we've had it in the forum before. It is a grown-up version of the putt-putt toy boat engine, done by the guy who actually started with those toys. The thing was tested on real-life boats, too, with some success. It worked well, but it just isn't that much better than the stuff people normally use -- the regular outboard engines.

Thats the story of most such patents. They work, but once they are built for production, they are not markedly better than teh existing alternatives and there is no big reason for them to make it on the market.

Conventional technology gets to be developed so far that new concepts, which do not have the benefit of decades of intense development, can rarely compete in commercial terms. Add the vested interestthe industry has in a certain way of doing things (into which they have sunk billions) and you and up with enormous odds against radically new concepts making it to the market.

Just look at the ultrasonic washing machine that works with plain water, without detergent. It's been around for almost half a century. It works well. It is not too expensive, either. Yet, it just doesn't exist on the market. It can't make it past the well-established, huge conventional home appliance industry. Not to speak of the simply enormous chemicals industry, which hates the idea of not being able to unload millions and millions of tons of detergent on people.

Bruno

[Viv]

Mark,

I think we've had it in the forum before. It is a grown-up version of the putt-putt toy boat engine, done by the guy who actually started with those toys. The thing was tested on real-life boats, too, with some success. It worked well, but it just isn't that much better than the stuff people normally use -- the regular outboard engines.

Thats the story of most such patents. They work, but once they are built for production, they are not markedly better than teh existing alternatives and there is no big reason for them to make it on the market.

Conventional technology gets to be developed so far that new concepts, which do not have the benefit of decades of intense development, can rarely compete in commercial terms. Add the vested interestthe industry has in a certain way of doing things (into which they have sunk billions) and you and up with enormous odds against radically new concepts making it to the market.

Just look at the ultrasonic washing machine that works with plain water, without detergent. It's been around for almost half a century. It works well. It is not too expensive, either. Yet, it just doesn't exist on the market. It can't make it past the well-established, huge conventional home appliance industry. Not to speak of the simply enormous chemicals industry, which hates the idea of not being able to unload millions and millions of tons of detergent on people.

Bruno

The little side effect of the local cats and dogs going insane when you turn on an ultrasonic cleaner has been worked out then:-)

Viv

[Bruno Ogorelec]

The little side effect of the local cats and dogs going insane when you turn on an ultrasonic cleaner has been worked out then:-)

Viv
----------

What? Pets prefer to stay dirty? :o)

BTW -- all those newfangled rotaries are fine, but look at this absolutely gorgeous oldfashioned engine made by 3W Modellmotoren of Germany. It is a four-stroke of 256 cc and 20 HP and weighs only 15 pounds.

Bruno

[Mark]

Mark,

I think we've had it in the forum before. It is a grown-up version of the putt-putt toy boat engine, done by the guy who actually started with those toys. The thing was tested on real-life boats, too, with some success. It worked well, but it just isn't that much better than the stuff people normally use -- the regular outboard engines.

Thats the story of most such patents. They work, but once they are built for production, they are not markedly better than teh existing alternatives and there is no big reason for them to make it on the market.

Conventional technology gets to be developed so far that new concepts, which do not have the benefit of decades of intense development, can rarely compete in commercial terms. Add the vested interestthe industry has in a certain way of doing things (into which they have sunk billions) and you and up with enormous odds against radically new concepts making it to the market.

Just look at the ultrasonic washing machine that works with plain water, without detergent. It's been around for almost half a century. It works well. It is not too expensive, either. Yet, it just doesn't exist on the market. It can't make it past the well-established, huge conventional home appliance industry. Not to speak of the simply enormous chemicals industry, which hates the idea of not being able to unload millions and millions of tons of detergent on people.

Bruno

The little side effect of the local cats and dogs going insane when you turn on an ultrasonic cleaner has been worked out then:-)

Viv

Still, I wish we had a data base of watery pulsejet devices, remember that bubble one that was mentioned Popular Science, it used condensing collapsing steam or air bubbles to create a shock wave which drove the water flow? A barrage of tiny bubbles suddenly cooled, creating a vacuum/void in water.
Mark

[Mike Everman]

I remember as a kid being in love with any WWII airplane that had a Pratt and Whitney Double Wasp radial engine. I loved and still love it's air cooled symmetry and powerful beauty, like my woman.
Mike

[Viv]

Hi Guys

Heres an updated link http://www.regtech.com/ the old address no longer works but the site is still an interesting read

Viv