Bevel gears are noisy and not known for their efficiency. Spiral bevel gears are a better choice.
U-joints can't manage 90°. What's the greatest angle they can accomodate before locking up? 30°? If so, you'd need 3 and a long downtube.
I'd look into a pinion on the down shaft and spur gear with teeth on the side of the gear (axial) instead of the normal face (radial). You'd have the advantage of gear reduction, too.
Or, you could just put the motor in a pod at the end of the downtube.
--- In electricboats@yahoogroups.com, Craig Carmichael <craig@...> wrote:
>
> >searched "right angle drive"
>
> A search sounded like a great idea.
>
> Results: In addition to geared drives, there's the noiseless Almond
> Right Angle Drive (evidently high 90's % efficient but looks bulky),
> which led me to youtube where I found 2 models of 'Almond', a Meccano
> set right angle drive, and a MAC gearless angle drive (for socket
> wrench sets).
>
> The Meccano and the Mac were more or less the same idea. The MAC
> seemed interesting, being that it's made for socket sets. It might
> even be available.
>
> However, I'm still thinking the U-joints look like the best bet. The
> socket wrench ones aren't ideal and may prove inadequate for long
> term running, and it may want more than two... but in principle it
> seems like a good system.
>
> >not tryin to be negative, just relating some personal experience
> >with mechanical stuff.
>
> Thanks! I think I'll steer clear of the CV joints.
>
> -----
>
> I must remark that I hear all the time "if that could be done/if it
> was practical, someone would have done it." I find it's true much
> less often than you'd think.
>
> For example, I just realized last month that you can use a simple 3
> element planetary gear as a compact, infinitely variable torque
> converter to replace an entire automotive transmission. (My "Electric
> Hubcap" motor was named for where I want them to mount, not just for
> its pancake shape.) Just let the ring gear slip backwards at a
> controlled rate and you increase the reduction ratio between the sun
> gear and the planets assembly. You can have 1000 to 1 if it's needed.
> (Somewhat unintuitively, no energy is lost except frictional losses.
> The slip control is of course an important design detail. It can be
> controlled by a mechanical brake/clutch, possibly a magnetic brake,
> or with a motor/generator.)
>
> It took me 3 years to come up with that... and planetary gears have
> been around for maybe a century. If anyone else ever figured it out
> previously, they didn't tell anybody. There've been lots of people
> trying hard for a long time to come up with a good CVT or torque
> converter, and there are a number of strange, complex and inefficient
> designs out there.
>
> Craig
>
> Some Favorite Web Browsers:
>
> Big Game Hunt
> See Donkey
> Burning Coyote
> Shiny Plating
> Internet Exploiter (brought to you by the exploitive company that
> sued every individual Linux developer they could reach to try and
> extinguish Linux. IBM, however, bailed them all out.)
>
> ===
>
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