Thanks to all for dispelling some advice which may have been motivated by greed. While I'm not without means, I love to put projects together "on the cheap". My motor installation will be an outboard conversion in a well as in the Glen-L Etek example, so I don't think it will be exposed to lots of splashing. Unlike many retrofits, I am designing the boat for this purpose, so I am doing some weird stuff like putting my 6 Trojan T-105s in a hollow keel. Question: If I know my top voltage will be 36V and my top amp draw will be 84 amps, do I need to size my controller for the maximum draw for the motor? (200 amps)
Next, I am using a 10 HP Chrysler outboard for the lower unit. It has a 3 bladed prop (8-1/4" diameter) which according to the specs, spins at a max of 4700 RPM. (or are the specs referring to the engine speed rather than the prop speed?). If I expect to get 3 HP (to reach hull speed) from this unit I assume the IC horsepower would have an electric equivalent of 5 HP, which means 3/5 X 4700 RPM= 2820 RPM. The Mars 0909 spins at around 3200 RPM at 36 V. So if I do a direct connection I will be very close to the motor speed I need. Many here have advised using reduction. Is that for larger props? If I do a 3:1 reduction, according to my limited mental ability I would not get 3 HP out of this setup! Am I missing something?
--- In electricboats@yahoogroups.com, "Capt. Mike" <biankablog@...> wrote:
>
> I'll be starting my fourth year with brushes. No problems too
>
> Capt. Mike
> http://biankablog.blogspot.com
>
> Sent from on board BIANKA
> http://biankablog.blogspot.com
>
> -----Original Message-----
> From: Donald M Swanson <postal6@...>
> Sender: electricboats@yahoogroups.com
> Date: Thu, 24 Mar 2011 08:25:24
> To: <electricboats@yahoogroups.com>
> Reply-to: electricboats@...: <electricboats@yahoogroups.com>
> Subject: Re: [Electric Boats] brush or brushless?
>
> I have had my motor for two years, and it has brushes and I have never
> had a problem with it.
>
> Don
>
> On Thu, 24 Mar 2011 11:37:49 -0000 "affordableacadia"
> <affordableacadia@...> writes:
>
> Hello
>
> I am new to this forum but am building an 18' electric boat for
> recreational lobstering here in Maine. I had a Mars ME0909 picked out but
> the folks at electricmotorsport are trying to talk me out of it because
> they claim that "the brushes will tarnish in the water". Has anyone had
> this problem? Has anyone used the ME0909? Thanks. Bruce
>
>
>
>
> __________________________________________________________
> Get Free Email with Video Mail & Video Chat!
> http://www.juno.com/freeemail?refcd=JUTAGOUT1FREM0210
>
No comments:
Post a Comment