"roll your own".. funny expression no doubt, but pretty much what I had in mind pointing at the "monsterscooterparts.com" site, I dont know what kind of power requirements your 30 footers really need, the 24v 900 watt motors (1.2hp each) if 80% efficient is 1hp each.. they spin about 2500 rpm and belt or chain joining em at whatever reduction would be simple enough. same for replacement if one takes the proverbial dump, theyre not spendy. if theres 3 of em and one comes unglued, still got the power of the other 2 and can limp it home? not that it'd be a long trip with your 1hr runtime requirement. of course I'm still clueless to the boats size, weight, and speed expectations, 30ft length sq-rt x 1.35 calc's out to 7.39 nauts or 8.5mph max hull speed, if efficient.. 4000lbs, 3hp, hull constant 275 (low drag, plugging in arbitrarily for being displacement) shows a potential 8mph top speed, if thats helpful. I'm estimating 12 persons at 200lbs each and 1600lb boat tho.. prop slip being kinda moot point with the right ratio, prop pitch+diameter etc. I think the idea of golf cart motor is pretty rockin too, available and proven solid.
--- On Sun, 1/22/12, erik riffel <erik_riffel@yahoo.com> wrote:
From: erik riffel <erik_riffel@yahoo.com>
Subject: Re: [Electric Boats] 30 ft C&C/ Colombia 30
To: "electricboats@yahoogroups.com" <electricboats@yahoogroups.com>
Date: Sunday, January 22, 2012, 9:03 PM
Jim,
That is exactly what we are weighing out right now, do we purchase a kit or "Roll our Own", We have a lot of boats to get ready for the season and back in the water including the work going into the Red Wing. Thanks for your input as well as all the others that have commented. So glad I founf this forum. Erik Riffel
716 912 0635
From: luv2bsailin <luv2bsailin@yahoo.com>
To: electricboats@yahoogroups.com
Sent: Sunday, January 22, 2012 2:53 PM
Subject: Re: [Electric Boats] 30 ft C&C/ Colombia 30
Hi Erik, You might want to consider a belt drive. It's much easier to match the motor to the prop, which is critical to getting good performance. They are also much quieter than gearboxes, and can provide electrical isolation between the motor and shaft. It's pretty straight-forward to build up a motor mount to which you can bolt some store-bought mounted bearing assemblies to handle the thrust and side loads. There will be a lot of other details to work out of course, but that's half the fun in my book. In the end you probably won't save a ton of money vs. buying an off-the-shelf system like the ones my brother Scott at Electric Yacht sells, but if you prefer to "roll your own" I say go for it. It can be a lot of fun, and you'll get plenty of advise here. A 48V, 5KW motor and eight 6V golf cart batteries should give you the performance you are looking for, and then some. Good luck, and please keep us posted! Cheers, Jim McMillan --- In electricboats@yahoogroups.com, erik riffel <erik_riffel@...> wrote: > > Very nice! This is exactly what I want to do. I completely agree with your resourcefulness. You don't have to spend a ton of money to get things done..and done right! Erik Riffel > 716 912 0635 > >
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