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zzrider

Member Since 19 Sep 2011
Offline Last Active Today, 03:00 PM
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Posts I've Made

In Topic: 'The Tesla's of the sea are not far off'

14 February 2017 - 11:22 PM

Ev

 

 

Good numbers there stumble.  I get into these kinds of discussions all the time with good-intentioned folks who are just certain that we can all be doing everything we need with batteries, PV solar, and wind turbines.  Hard to get people to understand the dry numbers of energy storage and recharge.
 
I agree that it's going to take a quantum leap, technological breakthrough to get there.
 
IMO we ought to be focusing research dollars on synthesis of clean, renewable liquid hydrocarbons and clean ways to oxidize it.  Liquid hydrocarbons are, after all, solar energy stored in carbon's covalent bonds in a fabulously compact and economical package.  Why are we fucking around with batteries at all for large scale propulsion applications?  Batteries make sense for electronic devices and such, but propulsion?  Why?


There was an interesting fork in the road in the r&d with propulsion within the ranks of NASA scientists in the sixties. Those that argued the case for atomic propulsion vs fuel based propulsion were gradually weeded out or left on their own. The physicist Freeman Dyson has written about this juncture in history and where space exploration might be had they taken the less travelled route.

Their main problem was drag/resistance of the large tanks to house the fuel, which as history has shown, were opted to be discarded in flight.

 

 

Just imagine a rocket propelled by batteries.

 

The nuclear-thermal rocket engine sure is interesting... kinda weird that it never took off.


In Topic: 'The Tesla's of the sea are not far off'

14 February 2017 - 09:34 PM

Good numbers there stumble.  I get into these kinds of discussions all the time with good-intentioned folks who are just certain that we can all be doing everything we need with batteries, PV solar, and wind turbines.  Hard to get people to understand the dry numbers of energy storage and recharge.

 

I agree that it's going to take a quantum leap, technological breakthrough to get there.

 

IMO we ought to be focusing research dollars on synthesis of clean, renewable liquid hydrocarbons and clean ways to oxidize it.  Liquid hydrocarbons are, after all, solar energy stored in carbon's covalent bonds in a fabulously compact and economical package.  Why are we fucking around with batteries at all for large scale propulsion applications?  Batteries make sense for electronic devices and such, but propulsion?  Why?


In Topic: 'The Tesla's of the sea are not far off'

14 February 2017 - 02:11 PM

Interesting, but smells more like marketing glitz than anything else. Article is thin on detail but they're calling it a hybrid so I assume it's got a diesel hiding in the bilge to charge the batteries.

Sounds perfect for SF. Evening sunset cruise passengers will think they're saving the planet on a battery-powered boat and won't have to be present when the nasty engine is producing evil CO2 to recharge.

Leaps and bounds will happen when batteries can match the energy storage density of liquid hydrocarbons.

In Topic: Monitor self-steer on a C&C?

13 February 2017 - 08:23 PM

Take a look at the Cape Horn system as well.  The installs look very clean, no oil derrick look.
 
Here is a link to an install on a C&C 37+
http://www.capehorn....2006/C&C37 .htm

 
Oh man this is sweet, the 37+ transom and steering arrangement is virtually identical to my 34+.  I was wondering if it would be possible to run the vane's control lines directly to the steering drive wheel since it's right there, and keep it off the helm  wheel;  It appears that this is exactly what they did here.

Edit: actually, they also show a Cape Horn on my exact boat. Perfect!

In Topic: Monitor self-steer on a C&C?

11 February 2017 - 11:11 PM

Just get a decent auto pilot and get on with your life ...

 

Do not want.

 

An underdeck pilot is impossible on my boat (cables and drive wheel at top of rudder stock is above deck, rudder stock is completely inaccessible between the hull and deck), leaving me a wheel pilot as only option.

 

Don't want to deal with the power requirements of an autopilot either.

 

In some ways I'm a bit of a luddite.  I just like the simple mechanical elegance of a vane steering gear.  I don't even have or want a masthead wind electronics, just a windex.