T-Pain Is On A Boat: Re: [Electric Boats] Re: 55' wooden hull in SFBay

Wednesday, August 3, 2011

Re: [Electric Boats] Re: 55' wooden hull in SFBay

Dear Dave,

I purchased a clutched pulley from www.clutchesandpulleys.com

set up like an automotive AC clutch for my hybrid experiments.

They are not cheap, but very high quality, and just right for your application. My 6" diameter, 1" bore with twin vee-belt groves is good to 60ftlbs, and cost around $700 with shipping.

Be Well,

Arby

On Aug 3, 2011, at 10:29 PM, "Mark n Angela" <mstafford@natca.net> wrote:

Dave,

I'll most likely use Eagle NRG Helical Offset Tooth (White - 32mm wide, 8 degree H.O.T. pitch) belt drive, with about a 4:1 motor:prop ratio, no additional clutching. Diesel's transmission in neutral will allow pure electric. In other words, if prop is turning, e-motor will be turning.

It's a modern ZF transmission with thin ATF lube, but there will still be up to maybe 10% parasitic drag loss. And when straight diesel motoring, electric motor will no-load spin, robbing maybe 4% engine:trans:prop efficiency.

In Western terms: everything's a compromise. Or to put it more Zen-like: life is a balancing act.

Mark Stafford

--- In electricboats@yahoogroups.com, Dave Kellogg <inganear1@...> wrote:
>
> Marc,
> Just curious, what clutching mechanics were you planning on using with the hybrid thoughts when using one or the other or both together... Dave K
>
>
> ________________________________
> From: Mark n Angela <mstafford@...>
> To: electricboats@yahoogroups.com
> Sent: Tuesday, August 2, 2011 12:50 PM
> Subject: [Electric Boats] Re: 55' wooden hull in SFBay
>
> Eric,
>
> To take Myles off the hook, it is Mark Stafford who ripped out a 2500 pound GM271 diesel from a 1983 Herreshoff Marco Polo 55' sailboat named Constance in San Francisco Bay, and put in a 96volt DC GE 23hp motor and 1300 pounds of used and abused lead acid batteries.
>
> Batteries were the hardest part for installation and maintenance.
>
> I'm going hybrid: installing a 30hp ListerPetter diesel in parallel (either electric and/or diesel can drive the prop). I had planned to go serial hybrid (generator to batteries to e-motor), but my budget would not allow.
>
> Mark Stafford
>