This isn't a 'dinghy' per se, but it shows the capability of small planing boats powered by available off the shelf products. I put this together for the Torqeedo exhibit at the recent 2011 Miami Boat Show.
17.5mph top speed w/one person, 14.5mph w/2 people. About 1 hour at full throttle. Retail cost of the entire package (boat, motors, LiMa batteries, chargers) approx $30k.
See video at EPowerMarine's youtube channel:
http://www.youtube.com/watch?v=MqNnmOKlNVs
I'm on moderate for this forum so my responses might be delayed, but If anyone has specific questions I'm happy to answer via forum or direct email.
Capt. Todd
www.epowermarine.com
--- In electricboats@yahoogroups.com, rob linda <rob_linda_2000@...> wrote:
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> Myles,
> The only reason I'm involved is because of my amazement how little it needed and how fast it got on plane, that and the ballast (about half future battery weight)
> The belt for extra gearing will be considered.
> We still have to do some measurements and trials with smaller outboards, before hard choices are made.
> Imho if it doesn't get on the plane in 30 sec. it will not get on the plane at all.
> At present with the 15Hp it's more like 1 or 2 seconds to get up. It felt like it got up, while still turning the throttle.
> Rob on Linda
>
> --- On Thu, 5/5/11, Myles Twete <matwete@...> wrote:
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> From: Myles Twete <matwete@...>
> Subject: RE: [Electric Boats] Electric planing dinghy
> To: electricboats@yahoogroups.com
> Date: Thursday, May 5, 2011, 7:18 PM
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> Well, at 48v the ETEK’s no load speed is about 3600RPM. Assuming a nominal 2:1 ratio in the lower unit, you’d be looking at about 1800RPM at the prop.The 2-stroke motor is probably rated to over 5000RPM…you could add more “gearing†by belt-driving the drive shaft and be able to reach over 5000RPM without overreving the PM motor…assuming a power reduction after getting up on plane and that you could get up on plane within 30-seconds, even the 15HP short term rating on the ETEK is a bit conservative. I’ve seen a car with 8 ETEK’s deliver over 50HP each going down the drag strip---they were being driven with a contactor controller from a 96v pack!  -Myles  From: electricboats@yahoogroups.com [mailto:electricboats@yahoogroups.com] On Behalf Of rob_linda_2000
> Sent: Thursday, May 05, 2011 6:40 AM
> To: electricboats@yahoogroups.com
> Subject: [Electric Boats] Electric planing dinghy   Since liveaboards and cruisers anchored here in the lagoon have gotten used to seeing me move around in all weather in my solar powered sailing dinghy "Big Oil", without ever having to buy gas, I do a lot of explaining (preaching),answering questions etc.
> So I got an invitation to assist in the design and electrifying of a planing dinghy. Since I was impressed with the performance/weight of said dinghy, I accepted the invitation and would like ideas/comments/etc from this group.
> Dinghy:
> 16 Feet, made from some high tech foam, so light, that the guy has to BALLAST it. Presently it has a 15 HP in the back and if you open the throttle halfway, it jumps straight on the plane and remains planing throttled back to about half that.
> Range:
> It will only serves as ship to shore tender, 2 15min trips and back at most per day (between charges), so design is for 1 hour usage at minimum planing speed
> Motor;
> DIY outboard conversion using 48V ETEK or simular
> Batteries:
> Lithium 130Ah (for now)
> Charging from solar panels/generator on mother ship
> Question:
> We're trying to establish lowest RPM for planing with the 15HP and needed RPM for planing threshold, but still looking for right handheld tachometer.Any ideas out there, how RPM's of typical 2cyl outboard compares to ETEK/MARS at 48V
> Other question:
> We will be looking for 48V solar controller for lithium. Any suggestions?
> Any feedback is welcome
> Thank you
>
> Rob on Linda
>
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