RICH URAVITCH >> GETTING INTO E-JETS
The time couldn’t be better to get into jet modeling, especially the electric variety. What we now have available in EDF (electric ducted fan) models is nothing short of amazing, and it will only get better—and less expensive—as time goes on. Many now come with built-in stabilization systems that make flying them that much easier. Battery technology is also improving almost daily and “energy density” is increasing greatly.
Generally speaking, if you’re comfortable flying an aileronequipped, moderate-speed sport model, you should have no difficulty with a jet. If you are just getting started, however, here are some tips that will make the transition smoother. Most EDF jets fly much like their propdriven counterparts, but there are some differences. Once recognized and understood, these differences pretty much disappear. Initial takeoff acceleration is slower than with propdriven models, and with no prop blast over the control surfaces, control response will be a bit slower as well. Most jets cannot be hauled off the ground with brute power; they simply need to build up speed until the wing starts working. Any of the 70mm ducted fan–size ARFs are a good place to start, and many of them come with preinstalled retractable landing gear. Because they are made out of molded foam, they’re unfortunately prone to damage through day-to-day use, but they will give you valuable jet stick time. This class of jets is also less expensive and can be powered by smaller 3S and 4S LiPo packs. A perfect example of this is the E-flite Viper.
Stepping up in size to 80-110mm (90mm is becoming very popular) does increase expense somewhat but also makes available a fair number of jets that feature molded fiberglass components and balsa-sheeted wings. The advantages here are more durable airframes, better flying qualities, and larger equipment-installation areas so that components aren’t shoehorned into place. Batteries required for this class usually fall into the 4S to 8S category. The increased wing loading makes flaps more important, especially during landing. They are a great benefit, and you should practice using them to improve your landings skills.
Going up yet another size puts you in the 120mm and larger fan group. Generally operating with 10S to 12S packs (37 to 44 volts), they generate megawatts of power and demand respect, attention, and proper maintenance. Understandably, the components that fi t into this group are the most expensive. Don’t use questionable servos, radios, or battery packs that might be marginal in performance or otherwise seem suspect.
“MOST JETS CANNOT BE HAULED OFF THE GROUND WITH BRUTE POWER; THEY SIMPLY NEED TO BUILD UP SPEED UNTIL THE WING STARTS WORKING.”
The main thing about keeping your ESCs happy is to properly match all the items that make up your power system.
The Bf 110 is a great flying twin. Proper power setup is key.