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| You need to get the packs right up behind the firewall to get CG right. I slotted the firewall to take a removable battery carrier - this just fits into the slot and is held in place with a velcro'd keeper. Packs are spaced nicely in the airflow coming through the firewall and exiting in a hole cut in fuse bottom. |
| Robart HD mechanical retracts with their Robostruts cushion the landing very well. Even so, its best to beef up the mountings as I've seen three just pull out and go through the wing! |