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Is the 787 a failure ?
On Fri, 22 Mar 2013 12:40:50 -0000, "Keith W"
wrote: GunnerAsch wrote: On Fri, 22 Mar 2013 09:23:17 -0000, "Keith W" wrote: The conventional Batteries are sometimes called Sealed Lead Acid Batteries but they are actually AGM batteries. Modern passenger aircraft normally use Nickel Cadmium batteries Why havent they converted over to NmH? They have a relatively high self discharge rate and can lose up to 20% of the energy stored in the first 24 hours. This is acceptable for hybrid vehicles where the battery is primarily a temporary buffer to capture the energy from regenerative braking but not good for a system intended to initiate an aircraft startup sequence after a week in the hangar. Keith Thats not true anymore. Since Sanyo developed the Enerloop NiMH battery..they are being shipped charged from the factories. All the makers are using the new tech and have been doing so for at least 3 yrs. Ive got NiMH batteries that I only need to put on the charger ever 6 months, just to top them off. Gunner |
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