Posted by buickanddeere on January 20, 2013 at 15:09:59 from (74.220.189.226):
In Reply to: 787 and Li-ion posted by George Marsh on January 20, 2013 at 09:03:08:
Just simple matter of too many watts of power pushed into the battery and could not dissipate the heat. System voltage has to be dropped to limit charging current and heating. There should have been rtd's or thermal couples throughout the battery pack to monitor voltage. Given the price of fuel over the lifetime of the airframe. Manufactures go to extreme lengths such as the lithium batteries and carbon fibre composite structure. The more complicated you make anything, the more it will come back to bite you in the behind.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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