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Holcomb Ultra Imp / Perigee

 

holperi

 

Due to other events, notably the Bullet 2100 project and Molt’s declining health, the Micro-IMP was not developed further. Jerry Holcomb went on however to develop, build and fly a refinement of the Micro-IMP design which he named the “Perigee”.


The Perigee, which was designed by Jerry Holcomb of Perigee Associates and initially called the Ultra Imp, first  flew in April 1987 and is based on the TPG form of construction pioneered on the Aerocar Micro-Imp. This is a version of the same company's Mini-Imp, which clearly provided the conceptual starting point for the Perigee.
The TPG (Taylor Paper Glass) form of construction was developed by Moulton B. Taylor, president and general manager of Aerocar, which was created in 1948 to develop Mr Taylor's extraordinary flying car concept. TPG is a paper core (with metal inlays to accommodate compression loads) covered in glassfibre in a matrix of polyester resin and covered with ripstop Dacron fabric. The Mini-Imp and Micro-Imp both have retractable tricycle landing gear, but the Perigee uses fixed tailwheel landing gear with cantilever main legs ending in elegant speed fairing round the wheels. The need to accommodate a tailwheel led to an alteration of the Y-shape tail unit by comparison with the Aerocar types: in the Perigee it is turned through 1800 so that the vertical surface is at the bottom with the tailwheel attached to its lower edge.


The streamlined fuselaqe is of composite construction with spruce longerons, TPG bulkheads, cockpit floor, tailcone and side skins, a glassfibre nose and some aluminium alloy components. The braced high-set wing has an aluminium alloy/TPG main spar, a spruce/TPG rear spar, wood main ribs, TPG nose ribs, a glassfibre leading edge and fabric covering aft of the main spar. The full-span flaperons are of aluminium alloy sheet over polystyrene foam. The three tail surfaces are similar to the wing in basic construction, but have no wood in them. Propulsion is the task of a twin-blade pusher propeller behind the tail unit, and this is driven by an extension shaft running aft from the engine located behind the cockpit.


Fixed-gear, strut-based monoplane with Y tail, pusher engine. Wings fold for towing on highway. Optional retractable gear, cantilever wing. Powerplant: Cuyuna 430 drives controllable pusher prop. Landing gear: Fixed taildragger.

 

Information packages were sold but plans and kits never materialized.

Type: sport lightplane
Seats: one.
Powerplant: one 35-hp (26-kW) Cuyuna 430
Maximum speed 120 mph (193 km/h)
Initial climb rate 700 ft (213 m) per minute
Service ceiling 12,500 ft (3810 m)
Range 200 miles (322 km)
Empty weight 380 lb (172 kg)
Maximum take-off 720 lb (326 kg)
Wingspan 28 ft (8.53 m)
Length 15 ft 8 in (4.78 m)
Height 5 ft 2 in (1.57 m)
Wing area 81 sq.ft (7.53 sq.m).
Aspect Ratio 10:1.
Stall speed 40 mph.
Vmax 140 mph.
Takeoff run 300 ft. Landing roll 300 ft.
Fuel capacity 8+ USG.

 


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