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Re: Mike's Build Log

Posted: Sun Sep 23, 2018 9:55 am
by Nick
This is going to be so much fun!! :D
On the edge of my seat now Mike!

Re: Mike's Build Log

Posted: Tue Sep 25, 2018 5:15 pm
by Mark
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.

Re: Mike's Build Log

Posted: Tue Sep 25, 2018 5:30 pm
by Mike Everman
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.

Re: Mike's Build Log

Posted: Tue Sep 25, 2018 10:22 pm
by Mike Everman
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.

Re: Mike's Build Log

Posted: Wed Sep 26, 2018 6:06 am
by Nick
The spirit of exploration!