Parametric R/C Heli/Quadcopter Training Gear Hub
by chuank, published
This print allows you to make your own R/C Heli/Quadcopter training gear, with the similar levels of accuracy and build characteristics as store-bought training gear.
As it's parametric, you can define the number of arm sockets as well as your choice of rod diameter. Additional cutouts are done to minimize the weight of the hub.
Hopefully this will give you optimum flexibility in printing one with the correct size/arm count for your bird.
The default settings in the .SCAD and exported STL are for a 200-size heli, using 3mm carbon fiber rods as the arms.
<b>UPDATE:</b> Download the .STL file for a pre-generated hub set for 45mm diameter and 3mm rods. This .STL has additional fillets to strengthen the hub at its weakest points, and chamfers to ease insertion of the rods.
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Materials you'll need, besides this print: <ul><li>1) Rods for the landing gear. Carbon fiber rods are highly recommended for their shock-absorbing properties. Number of rods depends on the number of arms you set. Diameter depends on the type of bird you have.</li> <li>2) CA glue - apply some onto the rod before sticking it into the hub.</li> <li>3) Ping pong balls, whiffle balls, sponge balls, any round, smooth sphere to stab onto the end of your rod</li> <li>4) Cable ties to attach to your R/C heli.</li></ul>
Print instructions/tips: <ul><li>1) Use ABS. PLA will probably work but might be too brittle for R/C heli usage. IMPLA might work, though I've never tried that.</li> <li>2) The hub is printed upside down. No support material is needed.</li> <li>3) Specify a decent plugwall width, or risk rods snapping the printed arms off in a hard landing.</li> <li>4) If you're gonna use carbon fiber rod (or tube), go for a relatively thin diameter enough to hold up your heli, but pliant enough to absorb shock from bad landings. 3mm rod for my 200-size heli seems to work.</li></ul>