liveforphysics wrote:Very cool Jeremy! I always enjoy seeing your great projects.
That center section of the driveline will have continous rotational speed changes twice every rotation based on the amount of angularity at each joint. Running the second joint 180 out of phase counters the shaft deltaV for the remainder of the shaft/prop, but the section between the two will be a continous source of some of that 12w inefficiency, and getting as light as possible on that mid-shaft section reduces this loss. At your low speed range though, it may be trivial.
John in CR wrote:So a double U-joint results in constant velocity of the output shaft? I've gotta do a shaft drive now. I don't think I showed you the big brushed motor I have. It's too long to reasonably mount with the drive shaft parallel to the wheel axle, so that's been on hold pending a good right angle gearbox solution.
northernmike wrote:Anything to report? I do love this thread..
Lock wrote:Jeremy Harris wrote:I came across this: http://www.autocanoe.com/. Looks like a fun candidate for both road and water use, plus it includes paddles...
Hmmmm... I'd be cautious about anything touted using an oxymoron like "Happy Wife"...<hehe>
In that pic:
How exactly would you (well, female brought along for purpose) actually paddle the thing? Wouldn't the wheel cowlings be in the way? Could oars w/locks be employed instead? Dunno. Also, in the same "happy" pic, there seems to be quite a bit of turbulence/water being lifted/left behind by the paddles/wheels?
My suspicion is that the Autocanoe serves better on the hard than afloat!
And, according to the Internet Archive Wayback Machine:
The part about "Coming soon Electric powered Autocanoe!" has been posted on their site since December 2003 approx.? Hmmmmmmm.....
No pics on the site yet (after 5-6yrs) of smiling happy clients who have built the plans?
Never mind a movie of how it performs on land, I want to see/know how it performs on water!
...and if they are still married.
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