H2O propulsion from the main engine? on Max or Argo

[oztrax]

JETMATE

So then I thought to myself , if this actually works would it be possible to get on the plane ?

And I came across the Kawasaki Jetmate, 650 cc 2 stroke, 4 people, as aerodynamic as a brick,
just like the MAX and similar weight.

attachment.jpghull ent.jpg72.jpgattQWQWQWWachment.jpg

food for thought, jetdrives have been put on some pretty square dinghys with success
with good results.

The jetpumps on the Hustler and wedge are running at too low RPMs to achieve any reasonable thrust.

My MAX axle speed with a strobe RPM device reached 260 RPM MAX at the hub,
needs to be more like 2600 RPM to start getting decent thrust.
In other words the pumps on the Hustler and Wedge are only at jetpump idle,
on a jetski that equates to 6 knots max.

I think I can get at least 10 knots, which will be enough to cross tidal rivers and creeks,
however if I get it to plane(extra work needed for jetpump inlet and adding some Vee to the hull).

I would be happy to venture further out into calm seas.

Also I would like to tow the MAX behind my 19 foot Jetboat Half cabin as both a tender
and ATV to explore the many remote beaches and islands where I live.

I have had Achilles heel operations and my days of walking long distances especially on sand, are over.

Am in the final stages of designing my PTO drive design for the MAX (27 HP Kawasaki twin liquid cooled)

If it achieves over 4000 RPM I can go ahead with the pump.
My MAX engine I strobe measured at 3650 MAX RPM no load, off the the ground.

Aiming for 4800 RPM at WOT at the pump for a decent thrust result.
All depends if my drive mechanism handles the high revs OK.

regards
OZ

[JoeMeg]

Oztrax, just want to say thanks for posting the jet pump info. I'm very close to starting a Hustler build that will include a Berkeley 5J5 pump. The rpm info is very reassuring. I gleened that these pumps like to top out right around 6K rpm which to me made sense since most of the little 2 cycle engines of the day run 5800/6000 top end. I have a 1.5:1 rt. angle box that I intend on using. 4000 out of a 4 cycle V-Twin and 6000 to the pump should be way more than enough and I feel the 4 cycle will do well in the lower rpm ranges purely from torque. I have successfully disassembled pump and am impressed to see that it uses common lip seals and a 6203 bearing.




Jim, thanks for the info. I'll PM some replies to ya soon but still watch out for me heading toward your camp with a cooler full o Coors in June!

[oztrax]

Berkeley 5J5 jetpump

Looked up,the bit of info I managed to find on the 5J5.
Tried to make the graph and specs more readable.
But u can easily see the pump power graph starts at 2000 rpm.

image.jpg

One of my other projects is installing a Nissan YD25 turbo diesel to power my 19 foot jetboat. Hamilton jet supply a lot of information on how to match their jetpumps with various engines and hull sizes.

The theory is, where the HP and the JETPUMP RPM graph intersect, that will be your max RPM (and max speed, eg WOT)

Below my initial design graphs to see if the Nissan engine could cut it as Ford 351 V8 replacement, big shoes to fill for a 4 cyl.
image.jpg

And here u can see the power and torque curves to determine cruise RPM.
image.jpg

I chose the Nissan for its European Renault heritage, eg it had to capable of at least 4500 RPM without power curve dropping off to much.
With a 3700 max power sweet point for cruise.

Below an example of an engine that cannot rev high enough, in this case a 4l Perkins Phaser 4L turbodiesel. Enormous torque low down , but can't rev high enough to get JETPUMP working.

image.jpg


Regards
OZ