View source for Engineering:Stampe et Vertongen ST.26

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{|{{Infobox aircraft begin
 | name=Stampe et Vertongen ST.26
 | image=
 | caption=
}}{{Infobox aircraft type
 | type=[[Engineering:Trainer aircraft|trainer aircraft]]
 | national origin=Belgium
 | manufacturer=Stampe et Vertongen
 | designer=George W. Ivanov
 | first flight=1932
 | introduced=
 | retired=
 | status=
 | primary user=
 | more users= <!--Limited to three in total; separate using <br /> -->
 | produced= <!--years in production-->
 | number built=
 | program cost= <!--Total program cost-->
 | unit cost= <!--Incremental or flyaway cost for military or retail price for commercial aircraft-->
 | developed from=[[Engineering:Stampe et Vertongen RSV.28|Stampe et Vertongen RSV.28]] 
 | variants with their own articles=
}}
|}

The '''Stampe et Vertongen ST.26''' was a 1930s Belgian military blind- and night-flying trainer aircraft.

==Design and development==

The ST.26 was one of a long line of [[Engineering:Biplane|biplane]]s designed by Stampe et Vertongen with design input from Renard. Stampe et Vertongen's unusual type numbering system recorded wing area (in square metres) rather than chronological sequence. Its immediate predecessor was the 1929 RSV.28/180 Type III or RSV.28-PSV (''pilotage sans visibilité'',<ref name=Jou/> French for blind flying) so the ST.26 had reduced wing area as well as a different engine.<ref name=Lailes/>

It was a single bay design with wings built around two [[Biology:Spruce|spruce]] and [[Chemistry:Plywood|plywood]] [[Engineering:Spar (aeronautics)|spars]] and fabric covered. Its equal span wings had {{cvt|300|mm|in}} [[Engineering:Stagger (aeronautics)|stagger]] and were braced by forward leaning, parallel interplane struts. They were rectangular in plan apart from rounded tips, a long cut-out in the upper [[Engineering:Trailing edge|trailing edge]] and a shorter one in the [[Engineering:Trailing edge|trailing edge]] edge to improve the field of view from the forward cockpit. Both upper and lower wings were in two parts, the latter attached to the lower fuselage longerons. The upper halves joined a central dural frame supported by a cabane formed by pairs of upright, transverse N-form cabane struts. There were ailerons on both upper and lower wings, externally interconnected.<ref name=Lailes/>

The ST.26 was powered by an Armstrong Siddeley Lynx, a {{cvt|215|hp|kW}}, seven cylinder radial in the nose under a narrow [[Astronomy:Chord (aeronautics)|chord]], Townend ring fairing. It was gravity-fed from a {{cvt|120|L|Impgal USgal}} tank in the upper wing centre-section and attached to a stamped metal frame tube-mounted to the forward fuselage bulkhead, ahead of the cabane.  Behind it the fuselage frame was formed by four longerons in either [[Biology:Spruce|spruce]] or [[Biology:Beech|beech]], depending on local stresses, producing a flat-sided fuselage. This contained two dual control cockpits in tandem with the instructor under the upper cut-out; behind it the upper fuselage had raised decking. The student's cockpit was equipped with a totally enclosing blind flying hood. The ST.26 was also equipped for night-flying training, with electric searchlights and droppable flares under student control. At the rear the tail was conventional with a flight-adjustable, semi-elliptical tailplane mounted on top of the fuselage and carrying separate, rounded elevators. The fin had a near-quadrantal profile and carried a rounded, unbalanced [[Engineering:Rudder|rudder]] which moved in the elevator gap.<ref name=Lailes/>

Its fixed landing gear was of the split axle type and provided a wide  {{cvt|2.4|m|in}} track. Each axle was a pair of hinged tubes from the central fuselage, positioning the wheels well ahead of the centre of gravity to minimize the risk of nose-overs. The outer, converging axle ends met vertical Messier oleo struts, passing ahead of the leading edges and held at their upper ends by short V-struts from the upper fuselage longerons. The wheels were independently brakeable and its steel tailskid steerable.<ref name=Lailes/>

Little is known about the ST.26's career. Its first flight was in 1932, though a more precise date is lacking. It has been reported as continuing the development of the RSV.28<ref name=Jou/> but how long it survived the difficult financial conditions of the early 1930s is, again, unknown.

==Specifications==
{{Aircraft specs
|ref=Les Ailes 1932<ref name=Lailes/>
|prime units?=met
<!--
        General characteristics
-->
|genhide=

|crew=two, pupil and instructor
|length m=8.30
|length ft=
|length in=
|length note=
|span m=10.27
|span ft=
|span in=
|span note=
|upper span m=
|upper span ft=
|upper span in=
|upper span note=
|lower span m=
|lower span ft=
|lower span in=
|lower span note=
|height m=2.90
|height ft=
|height in=
|height note=
|wing area sqm=26
|wing area sqft=
|wing area note=
|aspect ratio=<!-- sailplanes -->
|airfoil=
|empty weight kg=800
|empty weight lb=
|empty weight note=
|gross weight kg=1100
|gross weight lb=
|gross weight note=
|max takeoff weight kg=
|max takeoff weight lb=
|max takeoff weight note=
|fuel capacity={{cvt|120|L|Impgal USgal}}

|more general=
<!--
        Powerplant
-->
|eng1 number=1
|eng1 name=Armstrong Siddeley Lynx
|eng1 type=7 cylinder radial
|eng1 kw=<!-- prop engines -->
|eng1 hp=215
|more power=

|prop blade number=2
|prop name=
|prop dia m=<!-- propeller aircraft -->
|prop dia ft=<!-- propeller aircraft -->
|prop dia in=<!-- propeller aircraft -->
|prop dia note=

<!--
        Performance
-->
|perfhide=

|max speed kmh=175
|max speed mph=
|max speed kts=
|max speed note=
|cruise speed kmh=145
|cruise speed mph=
|cruise speed kts=
|cruise speed note=<br />
*'''Landing speed:''' {{cvt|72|km/h|mph kn}}
|stall speed kmh=
|stall speed mph=
|stall speed kts=
|stall speed note=
|never exceed speed kmh=
|never exceed speed mph=
|never exceed speed kts=
|never exceed speed note=
|range km=400
|range miles=
|range nmi=
|range note=
|endurance=<!-- if range unknown -->
|ceiling m=5500
|ceiling ft=
|ceiling note=
|g limits=<!-- aerobatic -->
|roll rate=<!-- aerobatic -->
|glide ratio=<!-- sailplanes -->
|climb rate ms=
|climb rate ftmin=
|climb rate note=
|time to altitude=
|sink rate ms=<!-- sailplanes -->
|sink rate ftmin=<!-- sailplanes -->
|sink rate note=
|lift to drag=
|wing loading kg/m2=
|wing loading lb/sqft=
|wing loading note=
|fuel consumption kg/km=
|fuel consumption lb/mi=
|power/mass=

|more performance=
}}

==References==
{{reflist|refs=

<ref name=Lailes>{{cite journal |last= |first= |date=29 September 1932|title=L'Avion Stampe et Vertongen "S.T.-26"|journal=Les Ailes|issue=589 |pages=3|url=http://gallica.bnf.fr/ark:/12148/bpt6k6560185h/f3 }}</ref>

<ref name=Jou>{{cite book |last= Jouhaud |first= Reginald |title=Les Avions Stampe |year=1999|page=67 |publisher=Wimpel |location=Amsterdam }}</ref>

}}


[[Category:Biplanes]]
[[Category:Single-engined tractor aircraft]]

{{Sourceattribution|Stampe et Vertongen ST.26}}