AeroElectric-List Digest Archive

Thu 07/31/14


Total Messages Posted: 1



Today's Message Index:
----------------------
 
     1. 05:28 PM - Re: Ni-Cad? (John Loram)
 
 
 


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    Time: 05:28:27 PM PST US
    From: "John Loram" <johnl@loram.org>
    Subject: Ni-Cad?
    Well Said! -john- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L. Nuckolls, III Sent: Wednesday, July 30, 2014 8:15 AM Subject: Re: AeroElectric-List: Ni-Cad? .. People who understood batteries published reams of data on how to get the best performance from Ni-Cads . . . data which said "constant current charge" . . . but those- who-know-more-about-airplanes-than-we-do decided that it would be too much to expect an air-framer to install ni-cad friendly starter-generator controllers. They decreed that thermometers be added to ni-cads with displays on the panel along with warning lights for battery overheat. Instead of crafting a battery management system totally transparent to the pilots . . . the pilots were burdened with rudimentary system management duties to offset poor regulatory judgement. Hence, the ni-cad gets this bad rap for being higher risk . . . risks driven by inelegant design. As a chemical energy storage system, ni-cads have a lot going for them. But as we've discussed here on the List . . . there is no such creature as an alternative chemistry, drop-in lead-acid replacement. THERE ARE DIFFERENCES that beg understanding and deference in design, fabrication, installation, operation and maintenance. Whether lead-acid, ni-cad or lithium-ion . . . failure to pay homage to the physics gods is at best just expensive . . . at worst it sets airplanes on fire. Every technology comes with its own constellation of challenges. http://tinyurl.com/kxu3s6j Bob . . .




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