thank-you for the info on shells and flat bottom boats
wife likes the little boats
From: Ned Farinholt <nedfarinholt@comcast.net>
To: electricboats@yahoogroups.com
Sent: Wednesday, January 4, 2012 8:05 AM
Subject: Re: [Electric Boats] Sparky hobie 16 knots vs watts
Robert,
You may wish to search the Wye Island Electric Boat Marathon postings. Charles Iliff has raced his electrified 58 ft and 40 ft rowing shells with various results. Also Jim Chapman has his well developed ecanoe info posted http://www.ecanoe.org. Also Todd Sims at www.epowermarine.com has considerable experience with electric powering of flat bottom boats.
You may wish to search the Wye Island Electric Boat Marathon postings. Charles Iliff has raced his electrified 58 ft and 40 ft rowing shells with various results. Also Jim Chapman has his well developed ecanoe info posted http://www.ecanoe.org. Also Todd Sims at www.epowermarine.com has considerable experience with electric powering of flat bottom boats.
Best wishes,
Ned
On Jan 4, 2012, at 8:38 AM, Robert Jorgenson wrote:
have you tried a rowing shell, very fast, light,
I have a 21 ft wt 70 lbs. $ $5.000.00
and
a 16 ft 60 lbs. $4,000.00
and
a 16 ft canoe Mad River $1,500.00
what can I do with what I have
on a serious side
30 ft colombia 10,500 lbs
17 ft flat bottom drift boat by mad river 33 in beam 200 lbs
mini kota 24 v 70 lbs thurst = thinking about inboard motor
************** need shaft and propeller for drift boat **************
Price onboats for information (not cheap, quality)
From: redu <reino.urala@gmail.com>
To: electricboats@yahoogroups.com
Cc: davecanoehead <elderton@telus.net>
Sent: Tuesday, January 3, 2012 11:33 PM
Subject: Re: [Electric Boats] Sparky hobie 16 knots vs watts
Thanks Dave
In year 2007 a Tornado hull platform was tested. Actually there was only
one Tornado hull plus two small demihulls for stability. Total weight
370kg. Lead deep cycle batteries. Outboard conversion 15 kW. Propulsion
efficiency of less than 40% was achieved with a good large dia
propeller. Max. speed of 14 knots was measured. Test data for comparison:
1 knot 150W
2 knot 250W
3 knot 430W
4 knot 700W
5 knot 1100W
6 knot 1650W
7 knot 2250W
8 knot 3000W
9 knot 4000W
12 knot 6600W
Do not know how to improve the poor 40% efficiency? There was also a
severe heating problem with a motor inside outboard housing. Also the
cat hull platfom itself was a disappointment.
Looking now forward to a long and narrow (WL 9m / 1.2m) monohull elboat
with the same motor in a sort of sail drive assembly. Sitting inside the
hull, but not high over cat hulls.
redu
On 01/04/2012 02:38 AM, davecanoehead wrote:
> Hi all, here is some preliminary speed VS. range data on sparky. She is based on a Hobie 16 platform, 5 KW outboard conversion, 5 KW/H lithium batteries. Range assumes 100% discharge.
>
> 1 knot/90 watts/55 miles
> 2 knots/127 watts/78 miles
> 3 knots/223 watts/67.2 miles
> 4 knots/396 watts/50.5 miles
> 5 knots/660 watts/37.87 miles
> 6 knots/1440 watts/20.8 miles
> 7 knots/2100 watts/16 miles
> 8 knots/2900 watts/13.8 miles
> 9 knots/3650 watts/12.3 miles
>
> She still needs more work around the prop and leg to minimize cavitation etc. so we may get slightly better numbers going forward.
>
> Best,
>
> Dave E
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>
>
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