Sally:
That reminds me of my first cruise with electric propulsion. It was to Newport Rhode Island for a Rendezvous. A bunch of us had to wait for dockage. The diesel boats were all going around in circles using fuel otherwise they would be clunking the transmission levers back and forth while we waited for dock assignments. I just floated around outside the marina entrance in neutral. I only had to use EP power when I saw the boat was getting to close to the pier head.
BTW I charted my Columbus Day electro sail and it turns out it was 28 miles not 20 miles.
Capt. Mike
http://biankablog.blogspot.com
From: Sally Reuther <smreuther@gmail.com>
To: electricboats <electricboats@yahoogroups.com>
Sent: Monday, October 28, 2013 1:23 PM
Subject: Re: [Electric Boats] A Columbus Day Electro Sail
Mike,
David and the owner of the Chesapeake 32 which was in the Annapolis Sailboat Show, had a similar experience bringing the boat up to the show on Sunday before it opened.
The wind was behind them so they were sailing wing on wing at about 4 knots. They turned on the system to give them just a bit of "extra" and get rid of any prop drag. Their speed increased to 6 knots! Amp draw was only about 8 - 10 amps David said. They did that all the way from Herrington Harbor South to the mouth of the Severn River. Then they turned, sailed on in and dropped sails to motor into Mill Creek where the boat would dock for the night. Genset kicked in (inboard PolarDC 5kW diesel) when the batteries got down to 50%.
The next day was a totally different story! Wind was blowing in the high teens when they left the creek (up above Cantlers for those who know the area). By the time they came out into the bay to head back into Annapolis harbor they had 26 knots on the nose and 5 foot chop! Those square waves we get on the bay when the wind blows are no fun. The boat is a full keel and she handled it all great. The Thoosa 12000 delivered enough torque at 2/3 throttle to keep her moving into that mess at 2.5 to 3 knots! Genset kicked in and kept the batteries up until the turned toward Annapolis and they could ease up on the throttle. Then the genset began charging the battery bank.
This boat only has a 115ah battery bank due to space constraints. With the generator it isn't an issue because the boat automatically goes into diesel/electric mode when the batteries need charging. The genset turned off after they got into the harbor while they were circling waiting to move into the show. They motored in circles at a slow speed of 2-3 knots for the next several hours. The genset never did kick back in. It was a long, wet day for them before they finally tied up on D dock where the boat was on display throughout the show. But the electric propulsion system along with the diesel genset did beautifully and the owner is thrilled!
Electric sailing works!
Sally Reuther
Annapolis Hybrid Marine
On Mon, Oct 28, 2013 at 11:29 AM, Mike <biankablog@verizon.net> wrote:
SallyIt seems I try something new with the EP system every season usually not planned. Normally, I like to fire up the generator sooner rather than later if it looks like I'll be motoring for a while. But, because I started the cruise at night in almost non existent winds it was nice to be able to motor along quietly in the darkness. Could never do that with the diesel. The light winds came and went through out the day so that I never felt the need to fire up the generator until the anchor was set. I had a similar experience on the return leg that I have not posted about yet. The 8A4D AGM bank is still holding up well after six seasons. Plan to do some testing of them over the winter to see how they compared to previous test data.Capt. Mike
From: Sally Reuther <smreuther@gmail.com>
To: electricboats <electricboats@yahoogroups.com>
Sent: Sunday, October 27, 2013 12:25 PM
Subject: Re: [Electric Boats] A Columbus Day Electro Sail
Great electric sailing day on the water Capt. Mike! Thanks for the data - it's always helpful to see how the electric propulsion system works in various conditions. We were hard at work at the sailboat show in Annapolis telling people about the pleasure of electric sailing while you were living it!Sally ReutherAnnapolis Hybrid MarineOn Tue, Oct 22, 2013 at 10:32 AM, Mike <biankablog@verizon.net> wrote:
Had a real nice twenty mile Columbus Day voyage in mostly light winds so I did a lot of electro sailing. Got some battery numbers and charging times using the Honda at anchor along with some of the sights along the way here:Capt. Mike
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