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How-To's, Tips & Terminology

helis: 

HP03S with rotor removed

All our top tips, How-To's and explanations for terminology in the RC flying world are found here. They're generally applicable to any model so they get their own section. 

Pinion Modulus explained

helis: 

Matching the modulus of your pinion ( the gear on your motor ) to the helicopter main gear is vital to achieve efficient transfer of power and minimum wear on the gears.

But what is modulus and if you don't know what it is for a random pinion you found in the back of a drawer, how do you measure it?