Mike's Build Log

Moderator: Mike Everman

Nick
Posts: 365
Joined: Fri Oct 17, 2003 10:36 am
Antipspambot question: 0
Location: Somerset, UK
Contact:

Re: Mike's Build Log

Post by Nick » Sun Sep 23, 2018 9:55 am

This is going to be so much fun!! :D
On the edge of my seat now Mike!

Mark
Posts: 10743
Joined: Sat Oct 11, 2003 10:14 pm

Re: Mike's Build Log

Post by Mark » Tue Sep 25, 2018 5:15 pm

That looks like a nice pickle slicer. I looked for various steel/heat resistant impellors to spin up but never found anything suitable or low cost.. But the jet ski prop idea seems like something fun to try. Is that a skateboard wheel on the end of the shaft?
As an aside, I bought a few sets of wheels long ago to use for their bearings, how they spin so freely. I mounted a skateboard wheel onto the center post of a six cup holder spinning serving tray thingy and the thick six steel arms that hold the cups spin for almost 6 minutes, the hub of the 6 spoked array just resting on top of the wheel. It's odd how long it spins after it slows down somewhat, you'd think it was about ready to stop. The whole thing is stainless steel and the tray itself has a pretty mirror polished surface. The 6 arms that were meant to hold cups remind me of the rings on a chemistry ring stand. In other words it's somewhat pleasing to look at, a high end appearance if you will. I was thinking to spin it with a quartz jam jar one day.
Good luck with the jet ski jet drive approach. Ought to be interesting to see how it does.
Presentation is Everything

Mike Everman
Posts: 4926
Joined: Fri Oct 31, 2003 7:25 am
Antipspambot question: 0
Location: santa barbara, CA
Contact:

Re: Mike's Build Log

Post by Mike Everman » Tue Sep 25, 2018 5:30 pm

yeah, this is a fun one, Mark. With the skate wheel driving the side of the bike wheel, it will be a bout 1700 RPM per 10 MPH. I think it should take the heat, and part of it is going to be pumping cool air, so maybe it won't get as hot as I fear.
I got the right angle gearheads today. Pretty beefy. Just took one apart because they have a lot of drag. I'm soaking it in alcohol, as it has probably 50 yr old grease inside. Popped the seals off the bearings and it freed up pretty good. I'm thinking the rubber has swollen in all this time.
Gearheads.PNG
I'm a little worried that this aluminum housing will be so close to the pjet, but maybe it's not a thing. Certainly I won't be running it for an hour at a time.
Mike
__________________________
Follow my technical science blog at: http://mikeeverman.com/
Get alerts for the above on twitter at: http://twitter.com/mikeeverman

Mike Everman
Posts: 4926
Joined: Fri Oct 31, 2003 7:25 am
Antipspambot question: 0
Location: santa barbara, CA
Contact:

Re: Mike's Build Log

Post by Mike Everman » Tue Sep 25, 2018 10:22 pm

We may be wondering: Why, Mike, Why?

Well, reasoning goes like this:
I don't want a big horribly loud motor that wriggles my gizzards to push me around if I can create some mechanical advantage with a smaller one.
I could technically push myself around with this 5 lb thrust, but it would not tolerate even 1 degree of incline. (250 lb weight all up with rider)

So I have to gear down a turbine, and it matters very little what diameter. Better yet, if driving a bike wheel, the wheel becomes an idler, and my driving wheel of 2" diameter's tangential velocity is the bike velocity. Use a smaller driving wheel for more torque.
Mike
__________________________
Follow my technical science blog at: http://mikeeverman.com/
Get alerts for the above on twitter at: http://twitter.com/mikeeverman

Nick
Posts: 365
Joined: Fri Oct 17, 2003 10:36 am
Antipspambot question: 0
Location: Somerset, UK
Contact:

Re: Mike's Build Log

Post by Nick » Wed Sep 26, 2018 6:06 am

The spirit of exploration!

Post Reply