Huff-Daland XLB-1

Keystone Aircraft Corpora¬tion built a total of 220 aircraft in the US Army Air Corps LB (light bombardment) category, venturing briefly also into the B (bombardment) and HB (heavy bombardment) classifications. All except ten of the LBs were twin engined aircraft, but had their origins in the single–engined XLB 1 prototype and nine pre series LB 1 biplanes produced in 1925 by Key¬stone’s predecessor company, Huff Daland and Co Inc of Ogdensburg, New York, which became Keystone in March 1927.

The XLB-1 three-seat, single-engine light bomber was tested in 1923, mount¬ing an 800 hp Packard and was developed as the twin-engined XLB-3, with a crew of five. The basic LB 1 airframe was redesigned by Keystone in 1927 as the twin engined XLB¬3A.

Huff-Daland

Huff Daland and Co Inc of Ogdensburg, New York.
Huff-Daland became Keystone March 1927, still centered at Bristol, Pennsylvania.
Keystone Aircraft single-engined biplanes in the early 1920s had their origins in the single-¬engined XLB 1 prototype and nine pre series LB 1 biplanes produced in 1925 by Huff Daland and Co Inc of Ogdensburg, New York.

Hudson Tri-Motor

Devised and made by Mr Sandy Hudson Jr, a law enforcement operator of Black Mountain, North Carolina, the Tri-Motor is a powered conversion of a Schweizer SGU 1-19 single-seat sailplane fitted with three West Bend go-kart engines producing a total of 17.3hp and each driving a 2ft 1 in diameter two-blade wooden pusher propeller. Two West Bend Model 70013 engines are mounted on pylons on each side of the fuselage aft of the cockpit and between the wing bracing struts, and a West Bend Model 70012 is carried on a pylon on top of the rear fuselage in front of the fin. The total fuel capacity is approximately 2 US gallons, a small separate tank for the rear engine being mounted on the fin leading edge.

This powered conversion of SGU 1-19 N91817 was started in May 1962 and completed in September 1963 at a cost of $1,000; Mr Hudson won an award for the lowest powered aircraft with the Tri-Motor at the 1963 Fly-In of the Experimental Aircraft Assocation.

The standard SGU 1-19 is a utility and training single-seater of early postwar design with an all wood constant chord fabric-covered wooden wing with two spruce spars, spruce and mahogany plywood ribs and a ply leading edge. The fuselage is a fabric-covered welded chrome-molybdenum steel tube structure, and the landing gear is an unsprung monowheel with a single skid mounted on rubber blocks ahead of it, and a rubber-mounted tailskid. The tailplane and elevators are fabric-covered welded steel tube surfaces, the tailplane being braced, and the fin and rudder are either of fabric covered wooden construction when the SGU 1-19 is supplied in kit form for amateur builders, or of fabric covered steel and aluminium alloy when factory built. The pilot could sit in an open cockpit, or a transparent canopy could be provided as an optional ‘extra’.

Tri-Motor
Span: 36 ft 5 in
Length: 21 ft 0 in
Height: 5 ft 6 in
Empty weight: 449 lb
Max weight: 670 lb
Max level speed: 55 mph at sea level (power on)
Cruising speed: 45 mph (power on)
Rate of climb: 150 ft/min at sea level
Take-off run: 750 ft (power on)
Endurance: 8 min

HPK SP-1

Designed and built by Harold Hayden, Robert Kinney, Arthur Payne and Reno Benner in their spare time, over about five years, near Bristol, PA, USA.

Fuel is carried in the wing tips. Flaps are fitted.

Engine: Lycoming O-235-C1, 115 hp
Wing span: 25 ft
Wing area: 99 sq.ft
Length: 19.1 ft
Height: 8 ft 1 in
Gross weight: 1300 lb
Fuel capacity: 36 USG
Cruise: 145 mph
Wing loading: 13 lb/sq.ft
TO dist: 400 ft
Stall: 50 mph