Contributed by Jack Caynon
The instructions were fairly easy to follow, but there were no illustrations that guided you regarding assembly. The assembly order is logical if you give it some thought. I suggest that you first construct the fin can then work on your motor mount tube and centering rings after you have the fin can constructed so you can measure where your centering rings (only applicable for 3 inch motor applications) need to go in relation to the fin can's holes to attach it to the airframe.
For tools, you'll need a Phillips head screw driver (or allen wrench), a power drill, and drill bit set.
To attach the fin can to the airframe, you'll need to provide your own screws (6), either self-tapping or set screws.
Basically, the fin can is made up of three flanges and three fins. The way it works is that you sandwich a fin root between the left edge of one flange and the right edge of another then screw the two flanges together with the screws passing through holes drilled in the fin root. You loosely connect the next flange, fin, flange combination until all three of the fins and the three flanges form a fin can. Then before you tighten all of the screws, you slide the fin can onto your airframe. Now, find two small holes, one at the top center and the other at the bottom center of each flange. Once your motor mount tube with centering rings is installed inside the airframe place the holes over the area where your centering rings around the motor mount tube touch the inside of your airframe and drill holes through the fin can's holes into the airframe and centering rings. Now you can tighten all of the screws on the flanges, then screw self-tapping screws into the centering rings through each of the fin can holes to attach the fin can to the airframe.
For 4 inch minimum diameter applications, use set screws to attach the fin can to the fiberglass tubing. Make certain that your set screws do not interfere with the motor casing on the inside of the airframe.
PROs: No need to worry about alignment issues, fit, or sturdiness. Ease of construction.
CONs: Instructions could be a little clearer. It weighs a pound and a half. You need to provide your own hardware to attach the fin can to the airframe.
Construction Rating: 4 out of 5
Flight Rating: 5 out of 5
Overall Rating: 4 out of 5
What You Can Do