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rparigor(at)suffolk.lib.n
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 Posted: Tue Dec 30, 2008 12:34 pm Post subject: Has anyone mounted their battery aft of baggage bulkhead? |
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Has anyone mounted their battery aft of baggage bulkhead?
Have a picture or could you describe how you mounted? Any other comments?
I descided on a Odyssey PC545 using #4 aluminium wire.
Ron Parigoris
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craigb(at)onthenet.com.au
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| Posted: Wed Dec 31, 2008 12:18 am Post subject: Has anyone mounted their battery aft of baggage bulkhead? |
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I believe a few have, to deal with CofG issues, rather than adding
ballast to the rear they used the battery. Most seem to have run the cables
under the door sill. If yours is a trike or conventional gear you could run
the cables through the tunnel.
craig
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nwcmc(at)tiscali.co.uk
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| Posted: Wed Dec 31, 2008 2:10 am Post subject: Has anyone mounted their battery aft of baggage bulkhead? |
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I put my battery aft of the baggage compartment to help compensate for
the moment of the VP prop. Even with a trigear I would suggest that
running the battery cable under the door sill is a good idea for 2
reasons. Firstly it is a more direct route to the starter reducing cable
length and minimising bends in the cable. Secondly glassing ducting tube
to the door sill helps to stiffen it. In my opinion this is an area
which needs reinforcing anyway as a lot of load is placed on this area
when getting in or out of the aircraft. In the UK it is possible to buy
oval ducting tubing which is just a perfect size for #4 cable. If it is
cut to a length to just fit between the aft bulkhead and the firewall it
can be glassed in position and it is then an easy job to end feed #4
cable. I used more of this ducting on the port side in a similar way for
other for/aft wiring.
It may have been possible in my case to leave the battery in the engine
compartment. However I felt the pro's and con's of an aft battery
location weighed in the favour of an aft battery location. My reasons
were as follows:-
Forward Battery Location
Shorter cable - less weight (about 1.5lb saving), less voltage drop
Quicker and easier installation.
Rear Battery Location
C of G further aft gives more efficient cruising and,in the case of the
monowheel, easier handling during T/O and landing.
It is easier to arrange an external power connection (important in the
case of the need for a jump start).
The battery is kept away from heat and vibration.
Nigel Charles
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