Next up is to put together a custom battery tray. When performing a glow to electric conversion, often you can use the fuel tank floor for the battery tray. In this case, the floor needed to be lowered about an inch to have enough room for a 6S lipo pack. The stock floor is aligned by sitting in a notch formed by the fuselage doubler. Since I intended to lower the floor, I started by adding some balsa tri-stock to create an upper alignment point. I wanted an upper alignment so that I could easily add some cross-braces (see below) to reinforce the tray from beneath.
I cut a new tray from 1/8″ lite plywood. Unlike the stock tank floor, I cut this to fit the full length between F1 and F3. This will give me plenty of room to adjust the pack fore and aft when balancing. I also wanted to add slots for a Velcro battery strap on either side of the middle of the tray. To cut these slots, I clamped a piece of straight scrap-wood to my drill press table, then drilled a series of holes along the length of the slot. This arrangement allows you to quickly drill a series of holes along a line. The slots are then cleaned up with a popsicle stick with some sandpaper attached.
The tray is then glued in against the tri-stock. Given that a 6S battery can weigh in at over 1-1/2 lbs, I wanted to reinforce the battery tray. I added some 1/4″ x 1/8″ basswood cross braces beneath the tray. This creates a light but rigid platform for the battery. I may add some balsa tri-stock to the corner formed by the fuselage side and the tray floor before is close up the bottom of the fuselage.