Scioly.org

lucwilder42 wrote:On a separate note, assuming weight is under control, has anyone had success with three rotors? We have good two blade two rotor standard copters that we're boxing up til state, now I'm goin balls to the walls with new designs

It would need more torque to turn, i suppose if u know what your doing you could be successful.

thewinner wrote:How exactly would you get all four (or three) rotors to spin? It sounds interesting.

You just build it the way you build the two blade designs, but instead you just add another set of blades at a right angle.

Okay, thanks.

thewinner wrote:Okay, thanks.

Make sure your angles are perfect, it needs to be balanced.

Yeah, having a jig helps tremendously in making the blades identical. I didn't have one at the time I made it, so I plan on remaking one, but if you happen to beat me to it, please let me know how it works!

Yeah, I already have two jigs, one for the upper rotor, one for the lower. However, I'm worried that if I make a 3 or 4 bladed design with those jigs, it's going to be overweight since rotors I make from that jig with mylar covering weigh about 0.8 grams. Maybe smaller rotors would help.

Well, you may want to take some inspiration from the F1D flyers and maybe make your motorstick hollow, that would definitely save weight but make it extremely fragile. But the only benefit I can see for doing a quadrotor is the fact that they're extremely stable, but if you build a dualrotor copter well you can perhaps achieve the same stability. Still interesting to test and see.

What should my pitch be? Any ideas?

Honestly, I have learned from experience that it is unique to each helicopter. There is no magic number that will work for everyone. I've already tried searching for it
Try medium pitch and then try low pitch. Keep in mind that it depends on the type of rubber you are using.

For thinner rubber do you want a higher or lower pitch?