Electric One
For a fun model, we had designed the .19 powered Whiplash (published in Nov '74 AAM) and looked at this as a basis for an electric model. The overall size was increased somewhat to get a reasonably light wing loading. The airfoil was changed to semi-symmetrical; this would give us a better lift capability but still be aerobatic. A full 4-channel installation was planned. Basic aerobatic design-tapered wing, strip ailerons, generous rudder area, etc.-were all used to insure good performance. Nothing revolutionary, just sound basic proportions. Fuselage size was kept to a minimum. This presented the biggest problem due to the size and weight of the necessary battery packs for the Astro-25 motor. The unusual arrangement of the servo installation behind the wing, accessible through a hatch, enabled us to achieve a normal balance point for the aircraft. The wing was built-up rather than foamcored, for lightest possible weight. Using vertical spar webs gave the necessary strength. Plywood fuselage doublers are believed necessary because of the battery weight.
Computer Program: For Analysis and Comparison Of Aircraft Designs
RESPONSE to our computer program (for canard aircraft design assistance) presented in the June 1984 issue of Model Aviation has been positive and enthusiastic. Apparently our assumption that many modelers have home computers and want to use them for modeling purposes is correct. Our program was put to good use assisting in the design of a new canard Pattern aircraft, which was published in Flying Models magazine. Since then we have developed another computer program which we feel can be even more helpful to modelers. Why does one airplane perform better than another? What changes in the design make it better? Which airplane should you build next?
Firebolt
WHY BUILD a forward-swept wing (FSW), twin-finned, jet-styled pusher canard? Because it's modern, striking in appearance, different, fun, and best of all, it flies well. It's not Scale, and it's not optimized for Pattern flying, but it handles like a good Pattern/sport model. With a full-symmetrical airfoil, it's aerobatically capable; inverted passes, inside and outside loops, rolls, etc., are all easily handled.
Tandem Fan
THERE IS little doubt that ducted fans are rapidly becoming a standard and accepted part of model aviation. The WRAMS and Toledo Shows earlier this year saw the introduction of a number of aircraft kits designed around ducted fan power-plants of various sizes and types. The scratch builders haven't been forgotten, as more fan projects are showing up in the model press. The ducted fans will not be every modeler's bag-not only is there some complexity, but good engine operation knowledge is required, and attention must be paid to mechanical details. For those who are willing to do this, the rewards can be great-a scale jet model flying across the sky without a non-scale prop in the nose is a glorious sight.
T.C. TWO
If the sound of a twin engine turns you on as it does us, you will find this CL sport stunter of special interest. It's profile, and goes together quickly. Uses two .20 engines. The T.C. Two's trim lines are especially evident in this view. Prop spinners add to the semi-scale illusion as does the tricycle landing gear and simulated canopy.
