Schreder Airmate HP-10

HP-10
HP-10 fuselage on display
General information
Type	Glider
National origin	United States
Designer	Richard Schreder
Status	Out of production
Number built	9
History
Introduction date	1961
First flight	1961

The Schreder Airmate HP-10 is an American, high wing, single seat, FAI Standard Class glider that was designed by Richard Schreder. Airmate was the name of Schreder's design company. ^{[1] [2]}

The HP-10 in the centre of this line-up of Schreder gliders at the 1963 US Soaring Championships at Harris Hill, Elmira, NY.

Design and development

The HP-10 (HP stands for high performance) was designed by Schreder for the 1961 US Nationals. ^{[1] [2]}

The aircraft is built from aluminium and has a V-tail. The constant-chord wing is made up from eight aluminum honeycomb-sandwich structural panels and has large flaps, using up 34 ft (10.4 m), or 70%, of the 48 ft (14.6 m) wingspan. The wing uses a NACA 65 (3)-618 airfoil, the same profile as the HP-8. Some HP-10s were finished with Helisoar-produced fiberglass Hoerner wingtips. The landing gear is a fixed monowheel. ^{[1] [2] [3]}

The production rights to the HP-10 were purchased by Helisoar, a company owned by Steve duPont. The company produced a number of kits for the aircraft before production was ended. At least nine kits were completed, most in the Experimental - amateur-built category. Some were registered with the Federal Aviation Administration as Helisoar HP-10s. When Helisoar was liquidated duPont donated all the tooling, parts, drawings and engineering reports to the EAA AirVenture Museum as the Soaring Society of America had no storage space at that time. ^{[1] [2] [4]}

Operational history

Schreder and the HP-10 won the Stroukoff Trophy in 1961 for a 57 km/h (35.5 mph) 229 km (142 miles) goal and return flight. ^{[1] [2]}

With its high wing loading of 6.75 lb/sq ft (33.0 kg/m²) and small wing area of 114 sq ft (10.6 m2), the HP-10 developed a reputation of being difficult to keep aloft in weak soaring conditions. ^[2]

In April 2011 there were three HP-10s registered with the FAA, including one in the National Soaring Museum and one in the EAA AirVenture Museum. ^[4]

Aircraft on display

• EAA AirVenture Museum - 1 ^[3]
• National Soaring Museum - 1, listed as in storage ^[5]

Specifications (HP-10)

Data from Sailplane Directory, Soaring and EAA ^{[1] [2] [3]}

General characteristics

• Crew: one
• Length: 21 ft 11 in (6.68 m)
• Wingspan: 48 ft 0 in (14.63 m)
• Wing area: 114 sq ft (10.6 m²)
• Aspect ratio: 20.2
• Airfoil: NACA 65 (3)-618
• Empty weight: 535 lb (243 kg)
• Gross weight: 780 lb (354 kg)

Performance

• Stall speed: 38 mph (61 km/h, 33 kn)
• Never exceed speed: 150 mph (240 km/h, 130 kn)
• Maximum glide ratio: 35:1 at 60 mph (97 km/h)
• Rate of sink: 132 ft/min (0.67 m/s) at 43 mph (69 km/h) estimated
• Wing loading: 6.75 lb/sq ft (33.0 kg/m²)

See also

• List of gliders

References

1. Activate Media (2006). "HP-10 Airmate HP Aircraft, LLC". Archived from the original on April 5, 2012. Retrieved April 11, 2011.
2. Said, Bob: 1983 Sailplane Directory, Soaring Magazine , page 19. Soaring Society of America, November 1983. USPS 499-920
3. Experimental Aircraft Association (2011). "HELISOAR/DU PONT HP-10 – N319Y" . Retrieved April 11, 2011.
4. Federal Aviation Administration (April 2011). "Make / Model Inquiry Results" . Retrieved April 11, 2011.
5. National Soaring Museum (2011). "Sailplanes in Our Collection". Archived from the original on May 16, 2011. Retrieved February 26, 2011.