We run with a 2.6x1
Ray Electric Outboards
"I'm damned; I'm in love with the wind swept, stormy sea. Drawn by her rawness, her salty-scented spray tugs at my heart and my soul", "So Many Boats, So Little Time!"
From: bb386scn <bb386@scn.org>
To: electricboats@yahoogroups.com
Sent: Tuesday, October 16, 2012 2:45 PM
Subject: [Electric Boats] Re: O/B Gear Ratios? + 12V Accessories
To: electricboats@yahoogroups.com
Sent: Tuesday, October 16, 2012 2:45 PM
Subject: [Electric Boats] Re: O/B Gear Ratios? + 12V Accessories
The 2.8 to 1 gear ratio in your Honda outboard is the highest reduction that I have heard of. Sorry to hear it didn't work out for your application, but it should work well for a motor with more common RPM characteristics.
Has anyone else heard of an outboard with a gear reduction of greater than 2.8 to 1?
--- In mailto:electricboats%40yahoogroups.com, Craig Carmichael <craig@...> wrote:
>
> Hi,
>
> I converted a Honda 7.5 at one point with an early version of my
> "Electric Hubcap" motors (Honda is now sitting with no motor in it).
>
> Short clips for anyone interested:
> http://www.youtube.com/watch?v=X1MkdixNLcc - inside motor
> http://www.youtube.com/watch?v=n0JCRY8yGV8 - running in bucket
> http://www.youtube.com/watch?v=yUfqSSnEh5c - launch
> http://www.youtube.com/watch?v=R2f33577ADo - onboard
>
> (Later examination revealed the gear noise proved to be because the
> vertical shaft was pressing down quite hard on the gear at the foot.)
>
> It has about 2.8 to 1 reduction at the foot. This proved frustrating
> with a 2000 RPM motor, as it wouldn't get the prop going fast enough
> at full speed to get the boat making much wake, still less up on a
> plane.
>
> For a runabout, it seemed the prop should be going about the same
> speed as the motor (if not faster), not reduced. But all the gas
> outboards seem to have a considerable reduction at the foot, and
> seemingly no way to change it.
>
> Another person used an induction motor and a variable frequency drive
> (in a Johnson 10 or 15 HP?), which they set to 0-120 Hz insead of
> 0-60 Hz to get more speed. Of course, that's double as fast as the
> motor was designed to run.
>
> My latest idea has been to make an outboard from scratch, using two
> socket set drive or similar U-joints at the foot (running in oil) to
> do the 90 degree bend, 45 degrees each, with (obviously) a 1 to 1
> ratio. I still think this should work well - it seems to turn with
> low friction by hand (assuming the shafts are fixed in the desired
> positions with bearings, not flopping around) - but I've been onto
> other projects all summer. (So many things, so little time!)
>
> =====
>
> Since I'm writing... I did make or am making some 12 volt things that
> might be interesting to some electric boat users:
>
> - a 12 volt, 5 cubic foot, superinsulated (3" foam), Peltier cooled,
> shallow chest fridge, which freezes ice during the day while the
> solar energy is there, then lets the ice melt to keep the fridge cold
> overnight without needing any battery storage.
> - A 3D plastic printer (RepRap Mendel) from a kit. This helps produce
> some more things:
> - A new standard 12 volt plug and socket: Connector based on AT fuses
> (CAT plugs). They're the same as ATO/ATC DC fuses except one pin, the
> negative, is turned sideways to ensure polarity. So far I have plugs
> for cords, and sockets: for cords, a duplex panel mount face, and a
> duplex face for "1110 electrical box" (the ones for house lights and
> plugs).
> - I plan to wire my house with 12 VDC, with these sockets and plugs.
> The power will come from solar collectors now on my roof (charging
> NiMH batteries) when available, or from a 12 volt battery charger if
> the batteries get too low. I'm designing a 12 volt solar main
> distribution box with a number of features and circuits as well as
> main and branch breakers.
> - I've been doing LED 6" plastic globe lights that are 75 or 100
> lumens per watt (where "120 VAC LED bulbs" are usually 67 or less).
> I'm just now doing circuits to make lights that can accept
> unregulated battery voltage instead of 12.0 volts only. The present
> circuit still dims somewhat with falling voltage... which at least
> helps conserve low batteries.
>
> Craig
> Victoria BC
>
> =====
>
> >Hi,
> >
> >I am hoping to convert a gas outboard to electric and was wondering
> >which gas outboards might be better to start with.
> >
> >One thing I would particularly like is as low as possible (high
> >numerical reduction) of a gear ratio so the prop turns slower.
> >
> >Does anyone know what the standard gear ratios of common small
> >outboards are? Is there possibly a list that I might be able to see?
> >
> >Thanks!
> >
> >Bruce
>
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