Schreder HP-18

__NOTOC__ Infobox Aircraft
name=HP-18


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type=Club (formerly 15 metre) class Sailplane
manufacturer=Homebuilt
designer=Richard Schreder
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The HP-18 is a Richard Schreder-designed metal Racing Class sailplane that was offered as a kit for homebuilding during the 1970s and 1980s. cite web|url = http://www.sailplanedirectory.com/PlaneDetails.cfm?PlaneID=165 |title = HP-18 HP Aircraft, LLC |accessdate = 2008-07-24|last = Activate Media|authorlink = |year = 2006]

Description

The HP-18 is a flapped (15-meter) sailplane featuring a V-tail and 90-degree flaps for glidepath control. The fuselage is composed of a prefabricated composite forward fuselage and a semi-monocoque aft fuselage, and features steeply reclined seating and a side-stick controller although modifications using a conventional stick have been made.

Major features:
*Very low cockpit with reclining seating position
*Sidestick (changed to conventional stick by some homebuilders)
*Two-piece canopy (changed to single piece forward opening by some homebuilders)
*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
*Aluminium tail cone
*Winglets added by some homebuilders
*Water ballast carried inside the hollow aluminium wing spars
*Typical Schreder trailing edge flaps/airbrakes partially interconnected with the ailerons

Variants

As most homebuilts, the HP-18 has been constructed with many variations in detail. Perhaps the most significant version is the Super HP-18 developed by Canadians Ed Hollestelle and Udo Rumpf, which features a modified wing airfoil, winglets, a front-hinged canopy, conventional control stick and higher ballast capacity.

pecifications

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crew=One pilot
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length m=7.07
length ft=23
length in=2.4
span m=15.00
span ft=49
span in=2
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wing area sqm=10.5
wing area sqft=113
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aspect ratio= 21.4
empty weight kg=213
empty weight lb=470
gross weight kg=446
gross weight lb=970
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max speed kmh=240
max speed mph=150
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glide ratio= 38
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sink rate ms= 0.6
sink rate ftmin= 126

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References

* [http://www.soaridaho.com/Schreder/ Schreder Designs webpage]
*R Johnson, "A Flight Test Evaluation of the HP-18W Sailplane", Soaring, July 2003

External links

* [http://www.soaridaho.com/Schreder/HP-18/HP-18_Soaring_Review.html HP-18 Reference Info Link]