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A bit smaller than most used in the RV series of
aircraft. Apparently if only cranking power is the concern, an amazing
amount of energy can be had in a small package. But, if staying power is
required (such as alternator failure) then most of the smaller batteries I have
checked out don't provide more than 15-20 minutes at a normal all-electric
load.
I started out with two 22 lb concord batteries that were
huge - I then went to two Odyssey 680 batteries at 14 1/2 lbs each. These
were about 1/2 the volume of the concord. I now fly with one PC 680
battery which at 14 1/2 lbs seems to provide a good balance between light
weight, cranking power and staying power.
So for cranking your battery might do just fine - but, I
would look at the Amp hours you wish to have as a back up emergency reserve and
size your battery according to that.
Ed
----- Original Message -----
Sent: Tuesday, June 26, 2007 11:57
AM
Subject: [FlyRotary] Battery
My battery box in my kit will require a battery about 5 1/2" X 6". That
seems pretty small to me. Is that about average for aircraft
batteries?
Bob Mears
Supermarine Spitfire
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