Boat Journal

Chronicling a love affair with sailing

Tag: electric engine

The Long Road

Well, it’s that time of year again. The Cock Island Race is next Saturday. But family obligations left me with little vacation time. So, rather than taking the boat from Yorktown to Hampton on Thursday, then Hampton to Portsmouth on Friday, we took the boat up to Hampton on Sunday. This did offer the advantage that I had a weekend to check for optimal weather, rather than being locked into a single day.

Saturday and Sunday looked to be the same, weather wise: beautiful if you were on land or lounging at the beach, not exactly optimal for sailing. There was to be some breeze in the morning, but nothing in the afternoon. And the high temperature was expected to be 90. In other words, we’d have wind when it was cool in the morning and be roasting in the afternoon with no wind to cool us.

My crew for the day: Paul, Grant and Bette, were open on Sunday, so that’s the day we picked.

We were taking the boat to the Hampton Public Piers this time.  They offered a special with every 3rd night free and, if you paid for their annual ‘preferred guest’ pass, it was only $.75/foot/night as opposed to $1.50 – $1.75/foot/night at the other two places: Old Point Comfort and Salt Ponds. It would be about an hour farther than Salt Ponds, and we had made Salt Ponds before with no problem. Heck! We’d made it home from Hampton Public Pier last year without a hitch. So I decided to throw caution to the wind and not bring a generator for backup power this time.

The morning was beautiful. Not much sailing, since the breezes were light. But the sails were shading us from the sun and the temperature was pleasant. Early afternoon was about the same. We did get pushed by the wind a bit. But it was mostly motorsailing we were doing to keep the speeds up to at least 2.5 knots.

We did get some following winds to push us along. But the winds were fickle, changing direction enough that Grant and I got alot of practice putting up and down the whisker pole.

We had the autopilot on most of the time. I’d pick a marker at the end of whatever straight course we needed to follow. Paul would look it up on his phone’s Navionics app and give me the coordinates and I’d plug them into the Garmin 76CX GPS. This was much easier than finding the mark on that tiny map that the device gives, and it saved us using up Paul’s phone batteries by relying on it as the primary GPS device.

Towards mid-afternoon, Bette took over at the helm and the wind kicked up. I swear she brought the wind gods to our attention finally. We had had a bit of sailing before, but the winds had been so fickle that we have to be cautious that we were not losing ground by sailing back the way from which we had come. But after Bette took over, just past Salt Ponds, the winds were in our favor.  We were heeling 20 – 30 degrees and moving at quite  a clip – and in the right direction.

It was beautiful! I was finally able to turn off the engine. We were riding smooth. And the wind was keeping us from getting hot in the afternoon.

Paul's photo of us zipping along

[Photo by Paul Gregory]

We spent about an hour doing this, making our way towards the Hampton Roads Bridge Tunnel, trying to figure out who the ships were that we were seeing and just enjoying the chance to finally sail.

I took over the helm as we approached the tunnel. I turned back on the engine and kept us at about 2 – 2.5 knots, mindful of the fact that the display showed us with about 2-1/2 hours of battery life left at that point.

When we got to Bluewater Marine, the first marina in the downtown Hampton area, I asked Paul to take over the helm. As soon as I did, you could hear the engine ramp down. Paul pushed the throttle up the entire way and it didn’t change things. We had already put the sails down, and we had a following breeze, so I tried to pull the jib out. It got stuck about halfway, something it had done the last couple of times we had brought it out. If I went to the roller, pulled it back to roll the sail back on, then let it go, it would work. I’ll need to look at it next week when I have a few experts around.

I had tried several times to hail the dockmaster and received no answer. I called and left a message on her cell. Someone on the radio said she’d gone home for the day, that I should just find a slip and talk to her in the morning.

The engine gave up about 15 minutes after Paul went behind the wheel. But we had the current with us and the jib. So we sailed into the Hampton Public Piers.

The first slip we found was right beside the one marked for the water taxi and dinghy tie-up. I wasn’t sure that we could use it, so we moved down the dock. We finally found #12 open and turned in. We were only going about 1 kt at that point, so we could pull ourselves along the side of our neighbor into the slip. I jumped off the bow onto the dock and stopped the boat. We did bump lightly into the pier but sustained no damage. We tied up, ensuring we had a good spring line to avoid bumping into the pier.

I was very grateful for the crew I had. They knew what they were doing and there was no word of complaint, even after the heat hit us bad once the engine gave out. They worked together efficiently as a team to get the boat safely into the docks. I’m very happy they were with me.

I was wondering, as we were drifting in, whether we could have used the house batteries, which are on a separate circuit and still had plenty of juice as a backup to get us into the slip. Since the batteries are quite different, although both are 12V, I don’t know if any damage would be caused. I’m going to put a note out to the electric boat mailing list and an email to Electric Yacht to get some insight. I’ll post what I find here.

Engine Efficiency

I checked the engine out the other day, when I had the luxury of a winter sail. It was making some awful racket. It was rattling quite a bit. So yesterday, I pulled the panels off to take a closer look. It seems the bolts holding the engine in place had worked their way loose. So I tightened them up again and took the boat out for a spin (hey, someone has to take her out! 🙂 ). Much better! Looks like I need to put some Locktite on the engine support bolts as I did with the coupler to the shaft.

While out there, I took some measurements on the efficiency of the engine. It’s something the electric boats mailing list recommends; it’s a good way to determine how far you can go on your setup. The wind was blowing, and the tide was coming in pretty strong, so I’ll need to do this again come summer when everything is calm. But this was a good ‘first run’:

Amps vs Knots

Amps vs Knots

Not exactly a straight line, and it probably never will be, since I’m not running in a bathtub where I can control all the environmental factors.  But interesting nonetheless. However, part of the ‘hiccoughs’ are because I would run downstream, then upstream to see how the values changed.

 

 

 

Amps vs RPMs

20120202 – Amps vs RPMs

 

 

This is actually more interesting, because it will help me determine how far I can go on a charge. I’m guessing the formula would be:

Battery amp-hours/amps * knots/hour = knots to travel

That’s amp-hours, as in the amount of energy stored in the battery, not amps minus hours.

Using this calculation, it appears I can go about 16.5 NM on a single charge, if I stay under 2.5 knots. If I up it to 5 knots, I can only go about 2.5 NM.

As I said, I’ll recalculate this in the summer when things are a bit calmer. But it’s interesting nonetheless!

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Doing it Wrong

In our family, the story of the farmer and the mule is near and dear to our hearts:

A farmer is heading out of town. While he’s gone, his neighbor is going to take care of his mule.

“He’s a good mule, ” says the owner. “Treat him well, say kind words, and he’ll not give you a lick of trouble. He works hard, that’s a fact.”

So the owner leaves and the neighbor decides to make use of the mule. So he hooks him up to a plow and tries to get him to move. The animal won’t budge. So the neighbor tries speaking kind words to him.

No good. The mule won’t move.

He tries bribing the animal with apples, with carrots, with hay. It doesn’t help. The mule won’t budge.

The next week, the owner returns. His neighbor relates his frustration.

“I tried everything, just like you said. Kind words, treats. Nothing worked. That damn mule wouldn’t budge!”

“Hmmm,” said the farmer. Then he picks up a 2×4 and smacks the mule on the side of the head. The mule looks up, startled, and slowly starts to move.

“First,” said the farmer, “you have to get his attention.”

So, in our family, we talk about 2×4 mentalities.

This brings me to my ‘engine’ problems. Because the engine was the new piece on the boat, I blamed all the problems I was having on it. Everything wobbled. It had to be the engine. The boat wouldn’t move. It had to be the engine. In each case, that 2×4 came and smacked me hard on the side of the head to make me see it wasn’t the engine; it was other problems instead.

The serious vibration problem was a bent shaft. It had been suggested to me that I have the shaft checked before I put it back on the boat. I tried rolling the thing on a flat surface. It rolled just fine. I didn’t think it was an issue. But, after exhausting all other possibilities, when I took the boat out of the water again, I disassembled everything and took the shaft into a machine shop to have it checked. It was bent – at the conical section that attaches to the prop. So roll it all I want, I wasn’t going to see the issue.

Hooray! So we put everything back together, and checked it before putting it back in the water. I was told that might not find all the problems, because most of that vibration came when trying to move the boat through the water. But I figured it would point out any serious issues as I had been seeing.

Everything looked fine, so we launched again.

And the boat wouldn’t move. I mean, if it wasn’t a calm day, I would never have made it back to my slip!

Again, I blamed it on the engine. I wasn’t getting nearly the RPMs I should have. So I figured I’d connected something up wrong on the engine to make it less efficient.

Bless his heart! Scott McMillan said I was certainly getting enough amps out; I should be getting some speed. So he mailed me a new controller.

In the meantime, Irene happened. And, since we were expecting 100 MPH gusts in the area, I had the boat pulled out of the water. Luckily, those never materialized. In fact, Williamsburg and Richmond, more inland than we are, got the brunt of the storm in this area.

But I digress.

While we had the boat out of the water, I wanted to check to make sure I’d put that Max Prop together correctly. The damn thing has a hundred pieces and, having had inexperienced help to put it together, I figured we should recheck it.

While we were pulling it apart, someone else in the boat yard came by:

“Not moving the boat, huh?”

Yes, I answered, can’t move at all.

“I had the same problem. I put the prop together wrong, and couldn’t move at all.”

He offered to help us put it back together right. So we got out the installation instructions that I pulled off the web, and, very carefully, put the thing back together.

What had happened was that the blades were spinning flat. There was not corkscrew effect. So the thing wasn’t pushing the boat through the water at all. It’s also why the thing sounded like a blender in the water, rather than making the sound I was used to hearing.

As it happens, the guy who helped us out started explaining about the wobbling he was now experiencing. I strongly suggested he check out whether his propeller shaft was straight or not. 🙂

We put the boat back in the water again. This time, it ran like a dream. It did everything I expected it to. It is the end of the summer, but I finally have a boat that is a pleasure to use again. But, as a friend pointed out, I missed the hot miserable summer and I have a boat just in time to enjoy some beautiful fall weather!

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Boat Repair Pictures

I took copious pictures throughout the repairs this spring/summer. Rather than post them all here, here are links for you to follow to find them:

General Repairs
Cutless Bearing Replacement
Topside Painting
Motor Installation

 

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Initial Electric Engine Checkout

We finished wiring up the engine, and checked it out tonight. We left the engine disconnected from the prop, and, following the directions for a change (:) ), we turned on the main power switch, turned on the key, then turned the power knob on the engine all the way. We picked the right direction the first time, because when we pushed the throttle forward, the prop shaft turned clockwise (when facing forward). Just to confirm, we also moved the throttle into reverse. That worked, too.

Engine setup

We then took the time to connect the engine shaft to the prop shaft, using the coupler supplied by Electric Yacht. To avoid burning out the cutless bearing, we brought over a hose, turned on the water, and squirted the bearing while we repeated the tests. Everything worked out well, so we put it all away and took some time out for Dark and Stormys.

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