Overview
The compartment was added in a previous blog along with the relocation of the hydraulic pump and battery.
Why? - After a series of analyses using the factory cog calculator a 2.5 kg bar was still required at the fin post to achieve a 18.0% minimum cog. This achieved a total weight saving of 1.5 kg over the standard factory battery but I had to live with a bar in the bum - unacceptable.
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| Current Weight & Balance full tanks Empty tanks move the cog to 18.4% MAC |
Installation
The mounts for the battery / hydraulic pump were folded from 0.030'' 2024-T3 sheet into channels. These were mounted to the stringers with 30 x 30 angles folded from the same material and fixed using four [4] four 3.2 mm pop rivets. The channels were then prepared to accept either the battery or the hydraulic pump and then fixed to the angles with 3.2 mm pop rivets.
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| Fuse link located on the underside to preserve space in the tray in case I have to use a different battery. Positive and negative studs are the same as used on the firewall and remove the need to bend the battery cable through 90 degrees |
To preserve access to the inside of the aircraft the center tray was fabricated from 0.5 mm aluminium sheet and fixed to the channels using three [3] M5 screws on each side engaging with rivet nuts fixed into the channels sides and will be used to carry tie downs etc when in service.
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| Center tray used to store tie downs etc |
A set of straps will be added to the center tray to restrain any load placed in that area.
Comment
Very happy with the final location and no it will not move again - promice.
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