Monday, June 1, 2009

DURAND MARK V



STANDARD DATA: Gross wt. 1,840. Empty wt. 1,210. Fuel capacity 24.5. Wingspan 24'6". Length 20'3". Engine 150-hp Lycoming.
PERFORMANCE: Top mph 170. Cruise mph 135. Stall mph n/a. Climb rate 1,200. Ceiling 15,000. Range 520. Takeoff run 550. Landing roll 450.

The Durand biplane features a negative-stagger configuration so that it does not produce a full stall, only a very short period of “nibbling” with little loss of altitude. The structure is rated at +3.8Gs and -1.5Gs. Roll is produced by a combination of effects when a spoiler is activated, instead of by use of ailerons. According to its designer, a spoiler for roll control actually helps an airplane turn in the direction of the bank, while ailerons do not. The trailing edges of the wings are taken up by full-span flaps. With a standard 150-hp Lycoming, the Durand can carry two people with 128 pounds of baggage at 135 mph over a range of 520 miles. Cockpit controls are basic, with dual sticks in lieu of standard control wheels. The cabin features exceptional visibility by using a forward sliding canopy instead of side doors normally associated with high-wing and biplane cabin aircraft.



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