andyrebele

5 ms·

1.
by andyrebele 7y ago
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.
2.
by andyrebele 7y ago
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/policyinformation/pubs/pl170
3.
by andyrebele 7y ago
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 who fish for freshwater bass alone (1 in 16
4.
by andyrebele 7y ago
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.
5.
by andyrebele 7y ago
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.
6.
by andyrebele 7y ago
Besides the oil, the carbureted 2-strokes emit 25%+ of their fuel unburned.
7.
by andyrebele 7y ago
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 P2.5 or P10 (particulate) emissions, because they are much simp
8.
by andyrebele 7y ago
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 determinants of whether electric makes economic sense, n
9.
by andyrebele 7y ago
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.)
10.
by andyrebele 7y ago
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 powertrain and the hull. The rowing club in the article i
11.
by andyrebele 7y ago
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 site, and the specifications listed there, address the
12.
by andyrebele 7y ago
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 market, but it is not tiny.
13.
by andyrebele 7y ago
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 designed from the ground up for electric, and while the warra
14.
by andyrebele 7y ago
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.
15.
by andyrebele 7y ago
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 ~ 300 rather than the 1500 we expect with this one. Since
16.
by andyrebele 7y ago
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.
17.
Reducing pollution from boats by switching to electric motors(purewatercraft.com)
136 points by andyrebele 7y ago|112 comments
18.
Unlike SF, Seattle welcomes hacker houses(geekwire.com)
3 points by andyrebele 11y ago|0 comments
19.
by andyrebele 11y ago
See an analysis of whether this makes sense for home, business, and utilities: http://www.purewatercraft.com/thinking-about-energy-storage-...
20.
Tesla Energy fixed li-ion storage – make sense?(purewatercraft.com)
6 points by andyrebele 11y ago|0 comments
21.
by andyrebele 11y ago
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 same cells used in laptops, and the same chemistr
22.
by andyrebele 11y ago
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 many data sheets and white papers, none of which would by them
23.
Treat Li-Ion batteries like people to make them last(purewatercraft.com)
19 points by andyrebele 11y ago|8 comments