Hermanspann Chinook

Chinook
Role	Glider
National origin	United States
Designer	Fred Hermanspann and Art Penz
First flight	1993
Status	Production completed
Number built	One

The Hermanspann Chinook is an American mid-wing, two-seat, experimental research glider that was designed and constructed by Fred Hermanspann and Art Penz.[1][2]

Design and development

The Chinook and its improved variant, the Chinook S, have been used to study the effect of rain on airfoils and also stall dynamics.[1]

The aircraft is predominantly made from aluminium with the cockpit area made from fiberglass. Its 57 ft (17.4 m) span high aspect ratio wing employs a Wortmann FX67-K-170/17 airfoil. Glidepath control is via hydraulically operated trailing edge flaps that deflect 80°. The landing gear consists of hydraulically retractable nose gear and main gear. The vertical stabilizer is highly swept.[1][3]

The improved Chinook S features an improved wing tip design, system and structure refinements and a BRS-1200 ballistic parachute.

Only one Chinook was constructed and it was registered with the US Federal Aviation Administration in the Experimental - Amateur-built category.[1][2]

Operational history

In March 2015 the Chinook was still registered with the FAA to Hermanspann.[2]

After the conclusion of a number of research projects including about rain effects, performance measurements and stall dynamics, the sailplane was being employed extensively through 2015 for cross-country flying, having made a total of five crossings of the Cacscade mountains and having set four Washington state soaring records.

Variants

Chinook: Original configuration, first flown in 1993.[1][2]
Chinook S: Improved configuration, first flown in 1996.[1]

Specifications (Chinook S)

Data from Sailplane Directory[1]

General characteristics

Crew: one
Capacity: one passenger
Wingspan: 57 ft (17 m)
Wing area: 143 sq ft (13.3 m²)
Aspect ratio: 22.7
Airfoil: Wortmann FX67-K-170/17
Empty weight: 630 lb (286 kg)
Gross weight: 1,050 lb (476 kg)

Performance

Maximum glide ratio: 40:1 at 61 mph (98 km/h)
Rate of sink: 144 ft/min (0.73 m/s)
Wing loading: 7.34 lb/sq ft (35.8 kg/m²)

References

Activate Media (2006). "Chinook S Hermanspann". Archived from the original on 29 August 2012. Retrieved 14 August 2011.
Federal Aviation Administration (21 March 2015). "Make / Model Inquiry Results N100FH". Retrieved 21 March 2015.
Lednicer, David (2010). "The Incomplete Guide to Airfoil Usage". Archived from the original on 6 August 2013. Retrieved 14 August 2011.

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[SD-1] Activate Media (2006). "Chinook S Hermanspann". Archived from the original on 29 August 2012. Retrieved 14 August 2011.

[FAAReg-2] Federal Aviation Administration (21 March 2015). "Make / Model Inquiry Results N100FH". Retrieved 21 March 2015.

[Incomplete-3] Lednicer, David (2010). "The Incomplete Guide to Airfoil Usage". Archived from the original on 6 August 2013. Retrieved 14 August 2011.