This completes the assembly of the 78 inch Extra 300. As a final step clean the entire
aircraft with glass cleaner, then apply a coat of spray-on wax and buff the finish to a high
gloss. My favorite product for this is Eagle One Wet Wax AS-U-DRY, available in the
automotive section of most Wal-Marts, K-marts, Sears, Targets, etc. People often ask me
at trade shows how I get the planes to look so shiny, this is my secret. You may wish to
apply all of your graphics before applying the coat of wax.
Set-up and trimming
Besides basic assembly, this is the most important part of preparing your airplane for
flight. It can also be the most time consuming, but once your plane is properly dialed in
you will agree it was time well spent.
The center of gravity range for the 78 inch Extra 300 begins at 5.5” from the leading edge
of the wing measured at the root and extends back ¾” from this point. CG is determined
with the Extra in the upright position. One of the best ways to dial in the proper CG for
your aircraft is the 45 degree line test. Fly the aircraft in front of you from left to right (or
right to left if you prefer) at full throttle. Pull the aircraft into a 45 degree up line and
establish this line. Roll the aircraft inverted, neutralize the elevator and pay close
attention to what the plane does. Ideally the plane will continue on this line for several
hundred feet before it starts to slowly level off. If the airplane immediately drops the nose
and dives toward the ground it is nose heavy. If it begins to climb inverted toward the gear
it is tail heavy. There is no need to have the Extra excessively tail heavy to perform 3D
maneuvers. At this time you will also want to balance your plane laterally. Add a small
amount of weight to the wingtip to achieve proper lateral balance.
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Summary of Contents for 78" EXTRA 300 ARF
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