# Hermanspann Chinook

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The **Hermanspann Chinook** is an American [mid-wing](/source/Mid-wing), two-seat, [experimental](/source/Experimental_aircraft) research [glider](/source/Glider_(sailplane)) that was designed and constructed by [Fred Hermanspann](/source/Fred_Hermanspann) and [Art Penz](/source/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](/source/Airfoil) and also [stall](/source/Stall_(flight)) dynamics.[1]

The aircraft is predominantly made from [aluminium](/source/Aluminium) with the [cockpit](/source/Cockpit) area made from [fiberglass](/source/Fiberglass). Its high [aspect ratio](/source/Aspect_ratio_(wing)) wing has a 57 ft (17.4 m) span and employs a Wortmann FX67-K-170/17 airfoil. Glidepath control is via hydraulically operated [trailing edge](/source/Trailing_edge) [flaps](/source/Flap_(aircraft)) that deflect 80°. The [landing gear](/source/Landing_gear) consists of hydraulically retractable nose and main gear. The [vertical stabilizer](/source/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](/source/Ballistic_parachute).[citation needed]

Only one Chinook was constructed and it was registered with the US [Federal Aviation Administration](/source/Federal_Aviation_Administration) in the *[Experimental - Amateur-built](/source/Homebuilt_aircraft)* category.[1][2]

## Operational history

As of March 2015, the Chinook was still registered with the FAA to Hermanspann.[2]

After the conclusion of a number of research projects regarding 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 Cascade mountains and having set four Washington state soaring records.[citation needed]

## Variants

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

## References

1. Activate Media (2006). ["Chinook S Hermanspann"](https://web.archive.org/web/20120829145833/http://www.sailplanedirectory.com/PlaneDetails.cfm?planeID=57). Archived from [the original](http://www.sailplanedirectory.com/PlaneDetails.cfm?planeID=57) on 29 August 2012. Retrieved 14 August 2011.

1. [Federal Aviation Administration](/source/Federal_Aviation_Administration) (21 March 2015). ["Make / Model Inquiry Results N100FH"](https://web.archive.org/web/20120917193349/http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=100FH). Archived from [the original](http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=100FH) on September 17, 2012. Retrieved 21 March 2015.

1. Lednicer, David (2010). ["The Incomplete Guide to Airfoil Usage"](https://web.archive.org/web/20130806041032/http://www.ae.illinois.edu/m-selig/ads/aircraft.html). Archived from [the original](http://www.ae.illinois.edu/m-selig/ads/aircraft.html) on 6 August 2013. Retrieved 14 August 2011.

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Adapted from the Wikipedia article [Hermanspann Chinook](https://en.wikipedia.org/wiki/Hermanspann_Chinook) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Hermanspann_Chinook?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.