Snap (oz16635)

About this Plan

Snap. Control line stunt model.

Quote: "SNAP! Flying this model is like driving a Caddy. For .19's to .23's, it's the last word in sport jobs. Insides, outsides, eights, too - if you have to. By Vern Clements.

Snap is a very snappy performer, as well as a snap to build. It combines plenty of flying fun with good appearance from it simple functional design.

The original Snap uses the J Roberts Flight Control system which multiplies the fun element many times, giving the flier complete and instant control over the engine rpm's while on the ground and in the air. This means of control inspires a realistic type model, to coincide with the extremely real-like performance allowed by the Flight Control technique. However, you can install any control system you wish.

Snap does not have fancy curves, but its configuration very closely resembles a full scale Goodyear Racer. The scalelike appearance would be greatly enhanced with the addition of wheel pants and a horizontally mounted motor with an apple-cheek style cowl.

Improved ground handling qualities were incorporated into this design by using a 50% tail moment arm and large wheels, as well as utilizing the front lead-out cable for 'up' control. The use of the front cable for up elevator positions the line pull closer to the wheels, resulting in less crabbing away from the center of the circle during taxi runs with up control. This situation should he reversed on a tricycle gear design, using the rear lead-out cable for up elevator. Crabbing action is of little concern on models that take-off fast using full power, but looks bad when taxiing with low throttle speed. With the Flight Control system you will enjoy taxiing and shooting landings, which is why the above Mentioned good ground handling qualities were designed into the Snap.

Three airfoils are shown on the plans, giving you a choice. My version utilizes the NACA 0010 section, resulting in a very fast performer with the fine little K&B .23 doing the work. Consecutive vertical and horizontal eights, and inside or outside loops can be performed with my Snap at a breakneck speed, or at reduced throttle with the plane retaining consistent pull on the lines. This plane has a good power reserve when using engines in the .19 to .23 cubic inch displacement class.

Flying wires used on this model are three .010 x 57n ft. flexible steel cables available from the Flight Control manufacturer, already tied in even lengths.

My Snap weighs 26-1/2 ounces, with its effective wing area of 295 square inches putting it in a hot precision-sport class with smooth flying qualities. It is maneuverable as is, but if you are after a sharper turning full-stunt pattern performer, try adding another rib spacing of span to each tip, and possibly one inch more chord..."

Direct submission to Outerzone.

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