WIND-TUNNEL INVESTIGATIONS OF A 1/20-SCALE POWERED MODEL OPEN-OCEAN V/ STOL SEAPLANE
DAVID TAYLOR MODEL BASIN WASHINGTON DCAERODYNAMICS LAB
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Low-speed wind-tunnel tests were conducted on a 120-scale powered model of a proposed open-ocean VSTOL seaplane design. Hover and transition power required and climb and descent speeds at various flight path angles were determined. The effect of full-span spoilers on wing and canard stalling characteristics through transition was briefly investigated. A comparison of cruise performance of the seaplane and a conventional transport of equivalent size was made. After correction of the seaplane model cruise lift curve and drag polar to full-scale Reynolds number, cruise performance of the seaplane was found to compare favorably with that of the conventional monoplane. In the transition mode, the model is longitudinally unstable at high wing tilts and directionally stable at all wing tilts for the initial center-of-gravity location. With the present relationship of wing, canard, and center of gravity, the model cannot be trimmed in pitch by varying only incidence of the canard with uniform thrust setting on all engines. Differential thrust, the mechanism envisioned for hover control, is necessary for pitch trim and control throughout most of the transition mode.
- Fluid Mechanics