Valmet PIK-23 Towmaster
# Valmet PIK-23 Towmaster

The Valmet PIK-23 Towmaster or Suhinu is a Finnish two-seater glider-towing/primary trainer aircraft built entirely out of composite materials in the early 1980s.

## Design and development

The Finnish technology students aviation club (PIK) suggested in the 1970s, that a new aircraft should be developed for glider towing. The work focused on the improvement of a previous design, the PIK-19 Muhinu. Later on, the Helsinki University of Technology and Valmet Oy joined the project and the design process started from scratch. The goal was to develop a target/glider tower, which also could be used for basic training. It was given the name "PIK-23 Towmaster".

Only two aircraft were manufactured, one at Valmet and one at the Helsinki University of Technology. The first aircraft, OH-TOW, made its maiden flight on March 22, 1982, flown by Mikko Järvi. The second aircraft, OH-TUG, flew the following year.

Valmet marketed the aircraft intensively, but no orders followed. It was also investigated if the aircraft could be sold in parts, for self-assembly, in order to lower the price. In its intended role as a glider tower, the PIK-23 has been quite successful.

## Specifications (PIK-23)

Data from Jane's All The World's Aircraft 1982-83

General characteristics

* Crew: 2
* Length: 7.19 m (23 ft 7 in)
* Wingspan: 10.00 m (32 ft 10 in)
* Height: 2.90 m (9 ft 6 in)
* Wing area: 14.00 $m^2$ (150.7 sq ft)
* Aspect ratio: 7.14:1
* Airfoil: NACA $63_2415$ (modified)
* Empty weight: 590 kg (1,301 lb)
* Max takeoff weight: 870 kg (1,918 lb)
* Fuel capacity: 200 L (44 imp gal; 53 US gal)
* Powerplant: 1 × Avco Lycoming O-360-A4M air-cooled flat-four piston engine, 130 kW (180 hp)
* Propellers: 2-bladed Hoffmann fixed pitch

Performance

* Maximum speed: 250 km/h (160 mph, 130 kn) at sea level
* Cruise speed: 220 km/h (140 mph, 120 kn) at 3,660 m (12,010 ft) (65% power)
* Stall speed: 78 km/h (48 mph, 42 kn) (flaps down)
* Never exceed speed: 281 km/h (175 mph, 152 kn)
* Range: 1,250 km (780 mi, 670 nmi) at 3,660 m (12,010 ft) (65% power)
* Endurance: 6 hr 30 min (55% power)
* Rate of climb: 5.80 m/s (1,142 ft/min)
* Takeoff run to 15 m (50 ft): 320 m (1,050 ft)
