Addyman Zephyr: Difference between revisions

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{{Short description|One-off, British single seat sailplane, 1933}}

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{{Use British English|date=February 2018}}

{|{{Infobox Aircraft Begin

| name=Zephyr

| image=

| caption=

}}{{Infobox Aircraft Type

| type=Single-seat [[glider (sailplane)|sailplane]]

| type=

| national origin=[[United Kingdom]]

| manufacturer=E. T. W. Addyman at [[Harrogate]]

| designer=E. T. W. Addyman

| first flight=1933

| introduced=

| retired=

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| more users= <!--Limited to three in total; separate using <br /> -->

| produced= <!--years in production-->

| number built=1

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The '''Addyman Zephyr''' was a one-off, single-seat [[Glider (sailplane)|sailplane]] designed and built by Erik Addyman in the [[United Kingdom|UK]] for his own use in the 1930s.

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==Design==

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Erik Addyman designed and built the single-seat Zephyr, his first design, in 1933. It was intended as a light wind sailplane,<ref name=Horse/> combining a wing of modest aspect ratio with a nacelle cockpit and an open truss girder fuselage of the kind more common on [[primary glider]]s. It was a wooden-structured, largely [[aircraft fabric covering|fabric]]-covered aircraft.<ref name=Ellison/>

The two-[[spar (aviation)|spar]] wing had a straight [[leading edge]] and constant [[chord (aircraft)|chord]] out to a little over half span, where the trailing edges of the [[ailerons]], hinged at a slight angle to the spar, curved inwards to the wingtips. It was braced from above with pairs of wires from the spars to a central, inverted V-strut pylon and below by wires to the lower nacelle [[longerons]]. There were no [[flap (aircraft)|flaps]] or [[Air brake (aircraft)|air brakes]]. The central wing rib was continued rearward with the upper member of the open, flat, converging [[Warren girder]] fuselage, whose lower member joined the keel of the [[plywood]]- and fabric-covered nacelle just aft of the wing trailing edge. This placed the open single cockpit just forward of the wing leading edge. A central keel skid formed the main [[Landing gear|undercarriage]], with assistance from a tail bumper. A narrow-span, triangular [[tailplane]], wire braced above and below, carried longer-span [[elevator (aircraft)|elevators]] with rounded tips and a cut-out for the deep, rounded [[rudder]] hinged to small, triangular fin.<ref name=Ellison/>

The Zephyr flew for the first time in 1933.<ref name=Ellison/>

<!-- ==Operational history== -->

Only one Zephyr was built.<ref name=Ellison/> Based at [[Harrogate]],<ref name=Ellis22/><ref name=Zephyr/> where Addyman was honorary secretary of the Aircraft Club, it was often launched with a tow from a horse.<ref name=Horse/> He flew it from many fields in central and north-western [[England]] up to the early part of [[World War II]];<ref name=Ellison/> from 1940 there was a government ban on recreational glider flying. The Zephyr seems not to have flown again,<ref name=Ellison/> though substantial parts of it still (2010) exist in store.<ref name=Ellis22/>

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==Specifications (variant specified) ==

{{Aircraft specs

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|aspect ratio=9.5<!-- give where relevant eg sailplanes -->

|airfoil=

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|wing loading kg/m2=

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<!--==Notes==-->

==References==

{{reflist|refs=

<ref name=Ellison>{{cite book |title= British Gliders and Sailplanes|last=Ellison|first=Norman| year=1971|volume=|publisher=A & C Black Ltd|___location=London |isbn=978-0 -7136 -1189 8 5-2|page=79}}</ref>

<ref name=Ellis22>{{cite book |title= Wrecks & Relics|last=Ellis|first=Ken| year=2010|edition=22|publisher=Crecy |___location=Manchester |isbn=978-0-85979-150-2|page=265}}</ref>

}}

<ref name=Horse>{{cite journal|date=March 1934 |title=Horse-towed flight |journal=Sailing and Gliding |volume=5 |issue=3 |pages=34 |url=http://www.lakesgc.co.uk/mainwebpages/Sailplane%20&%20Glider%201930%20-%201955/volume%205%20No.%203%20Mar%201934.pdf |url-status=dead |archive-url=https://web.archive.org/web/20110930180132/http://www.lakesgc.co.uk/mainwebpages/Sailplane%20%26%20Glider%201930%20-%201955/volume%205%20No.%203%20Mar%201934.pdf |archive-date=2011-09-30 }}</ref>

<ref name=Zephyr>{{cite journal|date=March 1933 |title=News from the Clubs - a light wind sailplane |journal=Sailing and Gliding |volume=4 |issue=8 |pages=93 |url=http://www.lakesgc.co.uk/mainwebpages/Sailplane%20&%20Glider%201930%20-%201955/volume%204%20No.%208%20Apr%2028%201933.pdf |url-status=dead |archive-url=https://web.archive.org/web/20110930180017/http://www.lakesgc.co.uk/mainwebpages/Sailplane%20%26%20Glider%201930%20-%201955/volume%204%20No.%208%20Apr%2028%201933.pdf |archive-date=2011-09-30 }}</ref>

}}

<!-- ==Further reading== -->

<!-- ==External links== -->

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[[Category:1930s British sailplanes]]

{{Aviation lists}}

[[Category:BritishAircraft glidersfirst 1930-1939flown in 1933]]