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Smith Der Cricket

 

sm-der-cric


Der Kricket, an original bipe design by Cyril Smith, was built in 857 man hours, and finds that it flies fine from mile-high airports. The philosophy of design simplicity for Der Kricket began with selection of basic materials, and the construction concept developed requires only two sizes of 2024-13 aluminum angle. The spar for the horizontal stabilator is 2-inch square 6063 tubing, requiring a minimum of work. A 2-inch diameter 6063-15 tube spar for the rudder becomes self-hinging with two nylon, teflon or phenolic bushings. All ribs are constructed with a unique self-jigging tab to insure ac-curate alignment dpring attachment to the various spars. Fuselage is semi-monocoque construction, built upside down on a flat surface, and tricks bor-rowed from model-airplane building days are employed in assembling the fuselage. A 2 x 11-foot “pin board” on sawhorse supports is used for the fuselage layout. Longerons are tacked to the layout, then four bulkheads added to assure simple, accurate alignment. The “poor man’s deco,” (1/8th-inch soft aluminum pop rivets) are used when necessary for positioning, then are drilled out and replaced with monel or stainless steel pop rivets during final assembly. Full-flying tail surfaces, both vertical and horizontal, are easily constructed and attached, and provide effective control at low airspeeds, with ample rudder movement for takeoff and land-ing rolls. A good-sized antiservo tab was chosen to provide ample control feel and reasonable sensitivity at cruise speeds. Smith elected to utilize as many pre-fabricated items as possible in building Der Kricket - landing gear legs from the VP-1 Volksplane; aircraft-style Go Kart wheels and brakes; low-pressure aircraft tires for the mains; and a modified 5-inch caster for a tailwheel. The wing is a NACA 4412.

Gross weight 750 lbs
Empty weight 500 lbs
Fuel capacity 8-10 Usgal
Wing-span (biplane) 16’
Length 15’
Engine 1500cc-1835cc VW
Prop: 54 x 30
Vmax 138 mph
Cruise speed 90 mph
Climb rate 500 fpm
Range 200 nm
Wing loading: 7.3 lb/sq.ft
Pwr loading: 14 lb/hp

 

 


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