Selfbuilding of a Jet-Drive system

[jfblouin]

I'm interresting to make my own Jet-Drive propulsion system.

Does some boby do that?

Does some boby have information or diagram for me?

I want to propulse a 1500Kg (3000Lbs) boat to about 50 kmh (30 mph) whit a small diesel engine (to be choice). It's a project for building a boat like a RIB but with rigid tube.

Thanks for answer

PS Sorry for the bad english I'm a french speaking person but I can read every thing in english

[Dutch Peter]

I envy your confidence! Personally I feel building a system like that is too difficult, but I'd love to see you pull it of!

Good luck

[yipster]

not easy indeed making your own conventional Jet-Drive propulsion, and whats a "small" diesel? i think you need at least 150 hp
but here is a pulse jet design that can be home build and dont need a diesel
note how it sucks water in to vaporise and expand


this is another free piston pulse jet design:

read http://aardvark.co.nz/pjet/
than http://www.pulse-jets.com/
and if you do try to build such tube, protect your ears and dont burn your RIB

[Dutch Peter]

Geewizz Yipster,

Is there something you don't have? You keep amazing me with what you come up with! You live in a library?!

[larry v]

If your talking about water jet, the first ones were nothing more than water pumps mated to outboerd engines. I dont know if a diesel will get enough Rpm. to run one at that speed. To reach efficiency most water pumps have to turn about 3500 Rpm. so gearing might have to be done.{ www.smalloutboards.com } This place sells just the lower units to put on outboards. I have looked into this one myself, it is not as hard as one might think. hope this helps.

[mselle]

Look at this:
http://www.belljar.net/jetboatdevel1.htm
but I'm not sure if this is meant serious.

Marco.

[Tim B]

Marco,

An innovative solution indeed. A water-jet is just a pump, after all, and this may be a cheap method (depending on what weight of boat, resistance and top speed etc.)

Great stuff.

Tim B.

[Thunderhead19]

This is a good way to go also

http://www.animatedsoftware.com/pumpglos/teslapum.htm

Yipster! That looks like a gigantic "Pop-Pop" boat!!!

[yipster]

Originally Posted by Thunderhead19

This is a good way to go also

http://www.animatedsoftware.com/pumpglos/teslapum.htm

Yipster! That looks like a gigantic "Pop-Pop" boat!!!

Do like your intriqing Tesla pump...

"Pop-Pop" is close and in some ways similar but pictured above are "pulse jets".

[Ilan Voyager]

jfblouin,

A jet drive is high engineering, the propeller gives headaches to the best hydrodynamicians, and the price of all the custom parts you'll need to make will put in debt with your bank for the next 10 years.

After 25 years "small" jet drives are at the same point and with the same claims.
It's expensive stuff and the global efficiency is acceptable only with the big ones made by Kamewa for the fast ferries. For the others, efficiency range from "truly very bad" at "it's no so bad" like the Castoldi. Drive jets are useful only in some peculiar applications.

A surface drive will be more efficient and easier to conceive and make.

[Tall Timber]

Get a army surplus bridge building boat. aluminum, desiel/jet 30 kn speed