Yogi (oz221)

About this Plan

Super Yogi. Twin-tail, pusher powered, free flight design. Wingspan 42in, wing area 300 sq in.

Quote: "Here's a 'believe-it-or-not' contest winner with two first places to date, verdict for the pusher controversy...

Since the Yogi was first introduced in model competition, it has made quite a name for itself by its consistency in winning first place. Although the model is not a conventional type, it has remarkable flight characteristics, such as an ability to handle all the excess power the engine can develop without showing any tendancies to loop or spiral dive.

First of all, let us consider the aerodynamic reasons for its unparalleled performances. Being a pusher with the power plant behind the center of gravity, which is below the thrust line, the model tends to keep its nose down under power, preventing it from looping. The nose moment arm was made very short so the model could circle tightly in the glide without the possibility of spiralling in. Because of this, it was slightly difficult to obtain the proper balance, but by moving the ignition system as far forward as possible, this was overcome.

In order to cut down resistance to a minimum and also maintain a rigid and sturdy model, a single boom with a one-wheel, enclosed landing gear was used to great advantage. Under power, the propellor blast does not hit any part of the model, therefore greater thrust and more positive stability are obtained..."

From Model Airplane News, October 1944, later kitted by Eagle.

Supplementary file notes

Article pages, text and pics, thanks to AugustaWest.

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