EDU Resources
Mid-size XA-aerobatics
85-inch Extra 300EXP
With an 85 inch span, this XA model is certainly a looker. Usually powered by 50-60cc gasser, or an electric motor on 12S, this class of model is size-wise, about the limit of what can be transported without a trailer. Is one of these right for you?
Storage how-to: fuselages
On storing fuselages
Over the course of +50 years, an elaborate system for storing models has evolved where inactive ones are hung from ceilings, and active models are stored in the workshop. We'll delve into fuselage storage, plus show what can go wrong and how we made a repair.
Understanding voltage loss
Servo leads and extensions
Back when 4.8V servos output 48-120oz-in, building a model requiring servo extensions once involved buying what was offered in the hobby shop. These days, when 8.4V servos output ranges to 1155oz-in there's more to it. Heads up!
On what makes them different
Servo motors 101
Wondered about differences between iron-core, coreless, and brushless servos? It's down to the motors - we cut them open on a lathe to show you what’s inside!
Why some servos cost twice as much!
Servo motors 102
What's inside your servo motor-wise is what determines torque, speed, and most important to folk, the price. We detail the differences in how they're made.
Vibration kills servos
Throttle troubleshooting
An engine box mounted throttle servo with a straight steel pushrod is about the worst thing you can do but it's what manufacturers supply because it's cheap and easy. We're going to discuss a better way to go about it.
Getting back in the hobby
Rip Van Winkle; returning to RC
30 years is a long time in the world of technology, and RC has been no exception in advancing at a rapid pace. This how-to brings you up to speed on what you've missed!
airframe - tools
Tooling up
Gathering up the tools to build your model helicopter begins with metric Allen and nut drivers. Here we review the contents of an experienced builder's tool box.
avionics - selection
Servo selection
Hobby grade servos good enough? Consideration for these servo packages goes beyond weight, torque, speed, and price, so don't waste your time with this.
avionics - batteries
2S flight packs
2-cell lithium batteries power most models. Do you rely on cells comprised of plastic bags to save weight, or rugged steel shells? Choose wisely!
Avionics - receivers
RF systems
When it comes to RF systems, guess what? We don't have 'religion' regarding brands (and helis don't care) but we do have a few thoughts.
history - hughes 500
Hughes 500
Do thoughts of flying an airborne hot rod leave you cold? If that's the case then this brief photo-driven history and background regarding the Hughes 500 won't fly.

















