Viewing profile — andyrebele

With that outboard at wide-open-throttle, you were emitting ~ 4 gallons of unburned gasoline per hour out the exhaust, not to mention the oil you cited.

There are all sorts of surveys, but the best source I've found for real data on how much these boats are used is this official report on fuel usage (2013): https://www.fhwa.dot.gov…

While it's not a small market, it's in the Bay Area's blind spot. Fishing is the 2nd most popular outdoor activity in the US, behind running. In the US, there are 20 million people…

True, and they're so bad that CARB published a report saying one long day in a 2-stroke jetski pollutes as much as 10 years in a typical car.

Most 25-40 HP outboards sold today are 4-stroke. The only significant brand that's still 2-stroke in the US is Evinrude, and it has < 10% market share.

Besides the oil, the carbureted 2-strokes emit 25%+ of their fuel unburned.

The E-Tecs have done exactly what you said - a lot of engineering to meet emissions requirements. Unfortunately, the requirements for outboards include CO, NOx, and HC, but not P2.…

There are 3 answers to the "higher power" topic: 1) higher power motors are easy, bigger batteries are expensive and heavy. 2) frequency and regularity of usage are the best determ…

We took a coaching launch like the one in this article, fitted with the Pure Outboard, from Pier 52 in SF to Alameda Island and back. (Granted, it was not the wisest move.)

This outboard motor is 100% compatible with existing hulls, and complies with ABYC standards. That's the beauty of the boat market - a built-in API for the interface between the po…

Ha! Thanks. The video (if you're referring to the one on the web site) is an attempt to give the viewer a modicum of the feeling you get with a ride in the boat. The FAQ on the web…

There are 15.7 million recreational power boats in the US alone (1 for every 10 households), 70% of those in the installed base are powered by outboard motors. This is not the car …

Most of the electric outboards have bad reputations for reliability, as you said. And the warranties are even shorter than those of gas outboards. But this one is the first to be d…

The water. So they put the noise underwater, and it sounds quieter to the operator, so they think they're approaching the fish in a stealthier manner.

Before we did this outboard, I watched the Jamie Hyneman video you referenced. Because he doesn't use active thermal management of the cells, I would expect the cycle life to be ~ …

This is not 2-stroke. This is 4-stroke engines. There are no catalytic converters on marine outboard motors, so the 4-strokes are allowed to be > 100X as polluting as cars.

See an analysis of whether this makes sense for home, business, and utilities: http://www.purewatercraft.com/thinking-about-energy-storage-...

This post was not about boats; it's about li-ion batteries in general. We learned the lessons when developing our outboard motor battery pack, but the batteries we're using are the…

I put a link to Battery University at the end. Some of the numbers came from there. Others come from cell data sheets (best ones from Panasonic). A lot of this is synthesis over ma…