Before mounting the bracket, cut 2 holes into the firewall. One behind the motor for
cooling airflow to the batteries and another below the motor for the speed control.
Use the screws provided in the Mustang package to mount the motor bracket. Dont
forget to use Locktite on the all bolts. You can test fit the cowl to make sure the motor
mount is centered.
The next step is to cut out a hatch on the top of the fuse to allow battery changes without
removing the wing. Locate the formers from inside the fuse. There is one near the front
of the canopy and one at the front of the wing. Use a long push pin to punch holes
through the fuse from inside the fuse to mark the former locations. You
will need these locations to accurately cut through the fuse from the outside. A razor saw
works well to cut through the balsa. Stop when you reach the plywood section. You can cut
horizontally with an Exacto blade or a Dremel saw. Once you cut the hatch free, you
will need to build 2 semi-circular formers to reinforce each end of the hatch. I decided
to hinge the hatch on one side using nylon elevator hinges. Add a spring loaded latch to
hold the hatch in place.
You will now need to add 2 rectangular pieces of plywood, shown in the photo, as your
battery mounts. These mounts need to hold your 2-8 cell packs which weigh a total of
2 lbs so make sure they are strong. Epoxy them into place. Screw in heavy Velcro straps.
The horizontal stringers provide a standoff to allow airflow below the batteries. Don't
forget to cut an airflow exit on the bottom of the fuse behind the fiberglass air scoop. It
needs to be at least 1.5¡¨x 2.5".
Finish by mounting your prop using the 6mm Graupner prop adapter. The 60mm spinner
is too small for this plane but you will need the back plate to hold the collet on the motor
shaft. Ream the hole in the 80mm spinner backplate provided in the kit. Push the 6mm
collet onto the motor shaft, slide the 60mm spinner backplate, then slide on the 80mm
plastic backplate, and finally the 14x10 APC-E prop. (Remember to balance your prop.
It will vibrate badly and you will lose power if you don't. You'll also damage your gear
drive.) Put on the washer and nut and tighten. Slide the 80mm spinner on to the prop
assembly and screw in place.
You can now test your system. Please be careful to stay clear of the prop once you've
connected the power batteries. This system will deliver 7 lbs of thrust - it is powerful
and dangerous.
Before your first flight, check the CG. You can move the batteries back and forth to find
the proper location. Start a bit nose heavy and gradually move back to the proper CG
location. I found the Mustang to needed Down and Right Trim.
