Struhl Tailless (oz6245)
About this Plan
Struhl Tailless (Experimental Tailless). Control line sport pusher model.
Quote: "This model, aside from the aeronautical lessons it has to teach us, is certainly in line with the trends of the 'big boys,' what with Boeing, Northrop and other large producers pushing research to the limit in tailless aircraft.
Although original in every respect, this model does not deviate too greatly from the few trends and lines that have been set up by prior designers. The design presented is to be construed as a basic one - one on which a vast number of improvements can be made. The model as shown has definitely good flying characteristics with an unusual degree of longitudinal stability. It is advised that only experienced hands handle the model during the flight testing period as it is a little difficult to get it in proper trim. The model is very sensitive to adjustments so take care not to over-correct.
The author arrived at the various settings and force arrangmnents only after building three handlaunched gliders half the scale of the finished product The last glider made (same as the gas model, minus landing gear and engine) could take a 'baseball' throw and be adjusted to an unusual tight circle. The gas model was made into a U-control job as an extra precaution for controlling the flight path. Note the unique and simple system of obtaining two-elevator control from the one bellcrank. Reaction to the controls is a little slow on the original model so it is suggested that the elevators be increased in area or placed farther out on the wing. By using an engine of the Bantam class it was possible to keep the speed low enough to stay out of trouble. It is suggested that the builder follow suit. Exercise due care and diligenee in the construction and you will have the best 'nightmare' in the club. Pay particular attention to the rudder alignment and the wash-in in the wings to stay out of spiral dives and you can compete on the same basis with the free flight jobs.
Due to the paper shortage the plans had to be drawn less than full size. The page with the fuselage bulkheads and the curved trailing edge are drawn full size, however. To obtain full size plans enlarge the plan views 3-1/2 times using a pair of draftsman's dividers or the well known graph method.
CONSTRUCTION: Build the fuselage first. Note that Bulk-heads A and D are cut from 1/8 plywood as they mount the landing gear, and D in addition carries the motor mounts. The other bulkheads are cut from 3/32' sheet balsa. Cut the wing platform to shape from 1/8 hard sheet and mark off the positions of bulkheads B,C and D. Lay the wing platform on the workbench and cement the bulkheads in their proper positions..."
Hi Steve - Here is Richard Struhl's Tailless from Model Airplane News magazine issue 02-47.
Direct submission to Outerzone.
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