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We actually went over 100 during one pass, but Mike had to lift a little. Below are the data logs from our record runs. The battery current and voltage is from one 6S pack. There were 6 packs in...

Sorry, you're right. The results are below.

Lohring Miller

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My only personal experience with offshore racing was in the 2010 Cowes Torquay Cowes race. It was very rough. Mike, Dry Martini's owner, broke ribs, and it took us almost 6 hours to go the 200+...

I would like to congratulate my friend, Mike Bontoft for his fourth place overall, second place in class B finish. Mike has run his 35' 1973 Cigarette, Dry Martini, in the historic division in the...

There's been some progress in this area since the thread was started. A realistic looking electric outboard package has been developed. It can go 45 knots (51 mph). Note that duration isn't...

The two day US Safety at Sea course is much more comprehensive than the British version. Because of potential political issues, I took the British course as well. The US course involves among other...

Very nice scale boat, but I'd be surprised if it would go 60 mph. Our modified 26 cc engines develop around 6.5 hp at 16,000 rpm and typically drive offshore style 46" deep vee monos around 60 mph...

I was not there. I'm too old for the really rough stuff. Congratulations to my good friend Mike Bontoft for his second historic class win and sixth place finish. This year he didn't suffer broken...

We ran several versions of Mike's design to set model boat records. Wings in ground effect are an excellent way to reduce water drag. Unfortunately, the rougher it gets the poorer they work. I'm...

Our original design for a lead acid powered boat was an inboard. Here we felt we needed to fly a heavy boat so the design below was modeled in 1/4 scale for testing. When lithium polymer batteries...

I worked with Enerland for our boat's batteries. The batteries still cost $14,000. Since they have been bought by A123, You would need to start all over. Battery charging is also an issue. We...

Yes, but it only runs for 10 minutes. You could do that on 5 gallons of gasoline.

Lohring Miller

I need some real data from a real offshore boat. Specifically, weight power, and speed.

Let's go with two 150 KW (200 hp) motor/speed control systems. At 450 volts each would draw 337 amps. ...

Let's design a boat. Help me pick a fast, small hull, probably an inboard cat, and tell me how much power it takes to drive it at a particular speed. Please try to eliminate hype. I can calculate...

Steal away.

Using 300 shaft hp requires 375 hp or around 280 kilowatts of input power. With a 500 volt power supply you would need 560 amps to the motor. Two thousand pounds of lithium polymer...

Don't get me wrong, I love cats, and my partner Mike Bontoft worked on some of the early Cougar cats in his youth. However, my comment about "some people" reflects the entrance limitations in the...

And that's in absolutely calm water. It looks a lot more like this in a real race:
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I wrote an article on electric power for model boats here, but the principles are the same. One...

Drag in high speed boats is all about reducing contact with water. Since water is 800 times as dense as air, The drag in water is 800 times as much for the same object. Try sticking your hand in...

Early in my career I worked at Electric Boat on manuals for nuclear submarines. There, electric drive was used in experimental subs like the Tullibee because the gears between the turbines and...

I have some experience with both electric and offshore boats. Dry Martini had two 600 hp engines and a top speed of 85+ mph. We carried 400 gallons of fuel. Duplicating this with electric motors...

We started with a 1/4 scale model when we thought we had to run lead acid batteries. When the rules changed, we realized from model boat guys that we actually had more power available than small...

Electric boats are already running. See http://www.youtube.com/watch?v=-yNu2_LlO9s&feature=g-user-u m The problem is you can't have performance and endurance at the same time. There's no way an...

We've been attracted to water records for a long time. First it was the gasoline engine powered radio controlled model boat record. We were the first to set a record of over 100 mph in 2003 and our...

The boat is in England and will probably stay there. Mike has many contacts there. I'm not sure it will be raced again since it's very expensive just to fill up the tanks. Shipping back would be...

We put in west of Longview on the Washington side of the river at Fisher Island. Longview is in the background. That's the Longview bridge.

Lohring Miller