Denny , back again.
Firstly , I'be been crewing on "couta' boats , which are gaff/gunter rigged fishing boats , similar to the Grey Seal , and often with an old YSE12 or similar in them , along the "Shipwreck coast" of SW Victoria Australia.
Its aptly named , nearly claiming "Spirit of Mystery" recently , after sailing from the UK.
But having auxilery power with some grunt and sustainabilty is a big plus , when trying to punch through some of the blows that suddenly hit you.
The Couta boats have all upgraded , and on contacting the local dealer (who builds boats for these conditions) he recommended the 3YM20 , which develops 21hp at 3600.
I'm waiting on further advise from Hybrid Marine , but the Beta 25 they are developing I believe is a smaller electric motor , with a smaller power requirement , of course.
IF , I can get the system in to the Grey Seal without losing too much space to the batteries , then I'll never get caught short.
For normal sailing , then a small amount of electric power is all I need.
But if I've got to punch through strong head winds and big seas for 50 kms to get home , then I've got the power to do it.
One thing I want to ask though Denny , and that is locating batteries.
Is there any problem , if you have a distance between batteries ? , say in 2 of the batteries are 2-3 feet from the other 2 ?.
Assuming you use thick , heavy duty connections , is there any problem with that ?.
Regards Rob Johnson.
--- On Sat, 13/6/09, dennis wolfe <dwolfe@dropsheet.
From: dennis wolfe <dwolfe@dropsheet.
Subject: Re: [Electric Boats] Grey Seal conversion
To: electricboats@
Received: Saturday, 13 June, 2009, 11:34 AM
Rob,
That's a beautiful boat you are getting. Oughtred is a great designer. Good luck with the survey.
I looked up the Hybrid Marine System - if it is the one in the UK, the one with the 13kw electric motor plus a diesel engine is much more power than a Grey Seal can use. It's got to cost a fortune, too, I bet more than you are paying for the boat.
It sounds like you do not expect too much speed or range - a perfect candidate for E motion! Maybe you don't need the diesel at all...
Using Oughtred's 3800# displacement figure and guessing an 18' waterline length, a 48v 100amp motor/controller with (4) 100ah 12v batteries would give a top speed of 6.0 mph for 3 miles; 50% power gives 4.8 mph for 5 miles and 25% power gives 3.8 mph for 9 miles. Weight including batteries would be around 300#, probably less than the diesel, starting battery & tank you are removing. You can use your existing shaft, stuffing box, cutlass bearing, etc and maybe even the prop. This would be cost about $2.5k if you did your own mechanical work and maybe $4k - $5k for a drop in unit like the solidnav or electric yacht systems products. Figure another $1k for good AGM batteries. Look at the power page of my website to see an example.
Denny Wolfe
www.wolfEboats.
----- Original Message -----
From: Rob Johnson
To: electricboats@
Sent: Friday, June 12, 2009 7:24 PM
Subject: [Electric Boats] Grey Seal conversion
I'm shortly to take delivery (subject to a full survey) of an Iain Ourghtred Grey Seal , with an ancient Yanmar YSE 12 in it.
I reckon I can toss that , and put a Hybrid Marine system in , based on a Beta 25 diesel , and the Hybrid Marine setup.
My belief is that I will rarely need the diesel (but its nice to know its there) , and the electric power only long enough to get the sails up.
Its on a trailer , so I can take it home and recharge the batteries , or recharge with solar panels.
But the main thing is , quiet boating , and being able to have just enough power on to keep the boat pointing in to the wind for putting up sail , or lowering it.
That is ideal for electric , and not so good for diesel , that low revs running.
I can hardly wait !.
Regards Rob Johnson.
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