Schreder HP-14

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**Schreder HP-14**

Type designation	HP-14
Designer	Richard Schreder
Competition class	Club
Crew	1
Length	22.8 ft (6.95 m)
Height
Cockpit width
Cockpit height
Wingspan	54.6 ft (16.64 m)
Wing area	138.3 ft² (12.85 m²)
Aspect ratio	21.6
Wing profile	Wortmann FX 61-163
Empty mass	ca. 464 lb (210 kg)
Maximum mass	728 lb (330 kg)
Wing loading	5.26 lb/ft² (25.68 kg/m²)
Maximum speed	knots ( km/h)
Maneuver speed	knots ( km/h)
Speed in strong turbulence	knots ( km/h)
Minimum sink rate	ca. 110 ft/min (0.55 m/s)
Best glide ratio	ca. 39 at 48 knots (89 km/h)

1 History
2 Variants
3 Designation series
4 Sources

[edit] History

The HP-14 was developed from the HP-13, which was essentially a HP-11 fuselage with extended span and the HP-12 wing profile. The wing was later mated to an improved fuselage to become the HP-14.

The 14 used lower wing loading and reduced aspect ratio in an attempt to maximize performance in weak conditions. The HP-14 is built mostly in aviation-grade aluminium, following the belief of its designer that metal gliders could have performance equal to FRP gliders and were cheaper to build. The type features a 90 degree landing flap for approach control, originally operated by a rack and pinion mechanism.

More than 40 of all versions were built in the United States of America and by Slingsby in Great Britain.

The HP-14 is classified in the Experimental airworthiness category reserved for homebuilt aircraft, with the exception of the Slingsby HP-14C variant that is fully Certified.

[edit] Variants

The ship has appeared with all three tail styles: the original had the Schreder V-tail, Slingsby produced the HP-14C version with 18 m wing and conventional tail, and the HP-14T version used the HP-14C wing and a T-tail.
The HP-14C adopted a rechargeable pneumatic system to ease aerodynamic operating loads at high speed.
As with many homebuilts, a number of builders have made design changes to their ships. In some cases these have been substantial.
Andre Krutchkoff built his SHP-1 with his own design of fuselage with T-tail.
Paul Bikle built the T-6, a modified HP-14 with a 17.37 m (57 ft) wingspan and extensive modifications to the control system.
Otto Zauner constructed an 18 m model, the Zauner OZ-4, later modified with winglets for a span of 19.2 m (63 ft) and a gross weight of 386 kg (850 lb).
The Preiss RHJ-7 series is a two-seater variant developed from the HP-14.