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Schreder RS-15

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Schreder RS-15
Wiki 15 3view.GIF
Type designation RS-15
Designer Richard Schreder
Competition class Club (formerly 15 metre)
Crew 1
Length 22.0 ft (6.71 m)
Wingspan 49.2 ft (15 m)
Wing area 113 ft² (10.5 m²)
Aspect ratio 21.4
Wing profile Wortmann FX 67-K-170
Empty mass ca. 440 lb (200 kg)
Water ballast 200 lb (90 kg)
Maximum mass 940 lb (426 kg)
Wing loading 8.30 lb/ft² (40.5 kg/m²)
Maximum speed 150 mph (241 km/h)
Maneuver speed knots ( km/h)
Speed in strong
120 mph (193 km/h)
Minimum sink rate ca. 126 ft/min (0.64 m/s)
Best glide ratio ca. 38 at knots ( km/h)

The RS-15 is a Richard Schreder-designed metal Racing Class sailplane that was offered as a kit for homebuilding during the 1970s and 1980s.


The dominating aesthetic feature of the RS-15 is its pod-and-boom fuselage. The forward fuselage is a composite molding, and the aft portion is a 6" diameter aluminum tube. The V-tail is essentially the same as on other contemporary Schreder sailplanes, differing only in detail design from that of the HP-18.

Unlike Schreder's HP-series gliders, the RS-15 was intended to achieve more modest performance, sacrificing performance for a shortened build time.

Early RS-15 models featured wings that were essentially the same as the HP-16, and using the same one-piece machined aluminum I-beam wing spar. Later units were supplied with wing kits nearly identical to those of the HP-18, using that ship's riveted aluminum box spar. Unlike the HP-18, however, RS-15 examples usually lack the flap/aileron interconnect that adjusts the neutral aileron deflection to match that of the flap in the range of -10 to +10 flap deflection.

Major features:

  • Pod-and-boom fuselage with relatively deep cockpit
  • V-tail that folds upwards for easy storage
  • Wing structure composed of spars with caps pre-machined from solid aluminium plate and aluminium wing skins bonded to closely spaced foam ribs
  • Fiberglass fuselage pod, wing tip skids and tail fairings
  • Tubular aluminum aft fuselage
  • Winglets added by some homebuilders
  • Water ballast carried inside the hollow aluminium wing spars
  • Typical Schreder trailing edge flaps/airbrakes

Designation series

HP-7 - HP-8 - HP-10 - HP-11 - HP-12 - HP-13 - HP-14 - HP-15 - HP-16 - RS-15 - HP-17 - HP-18 - HP-19 - HP-20 - HP-21 - HP-22