Boomerang (oz2698)

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Boomerang (oz2698) by Frank Ehling 1942 - plan thumbnail

About this Plan

Boomerang. Frank Ehling, Air Trails September 1942.

Another interesting Ehling design. 72 in span, can be flown as powered FF or towline glider. The plan shows two different noses for the fuselage.

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Boomerang (oz2698) by Frank Ehling 1942 - model pic

Datafile:

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User comments

The B&W photo at the top can seem a little confusing because the model shows three vertical stabilizers like a Lockheed Constellation. This may have been part of Frank's early experimentation in the search for a de-thermalizer.
We often look back at these kids who were designing model airplanes before they could legally drink as aerodynamic prodigies. But, they were often side tracked by bad theories and did most of their best work through trial and error.
The entry for this model in the Zaic yearbook explains how this model employed an early version of the dethermalizer. At a point determined by a timer (mechanical or fuse), the outer thirds of the stabilizer would tip up and triple the vertical fin area. This, it was theorized, would cause the airplane to weathervane INTO the wind and return back to the launch sight. Well, a weather vane doesn't weather vane unless it is somehow attached to terra firma. It's just another example of how observing a model from a fixed place on the ground can feed into ideas like The Downwind Turn Myth.
Be careful trying to tell your buddies at the flying field that a model airplane doesn't know which way the wind is blowing once it's in the air. And, if you flew your model from a basket in a hot air balloon, and didn't look down at the ground, you'd never take the wind into consideration.
TomRyan - 11/12/2025
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Scaling

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