SDB Karat

{{Short description|Russian ultralight trike}} {{Use dmy dates|date=January 2022}} {{Use American English|date=January 2022}}  {{Infobox aircraft | name = Karat | logo = | logo_size = | image = | alt = | caption = | long_caption = | other_names = | aircraft_type = [[Ultralight trike]] | aim = | outcome = | related = | national_origin = [[Russia]] | manufacturer = [[SDB (Moscow State Technical University of Civil Aviation)|SDB]] | design_group = | designer = | builder = | issuer = | status = Production completed | owners = | primary_user = | more_users = | service = | major_applications = | proposals = | prototypes = | number_built = | construction_number = | civil_registration = | military_serial = | radio_code = | requirement = | aircraft_carried = | flights = | total_hours = | total_distance = | construction_date = | introduction = | retired = | first_flight = | initiated = | in_service = | last_flight = | expected = | developed_from = | variants = | developed_into = | preservation = | fate = | predecessors = | successors = | concluded = }} The '''SDB Karat''' is a Russian [[ultralight trike]] that was designed and produced by [[SDB (Moscow State Technical University of Civil Aviation)|SDB]] of [[Moscow]]. The aircraft was supplied as a complete ready-to-fly-aircraft.<ref name="WDLA11">Bayerl, Robby; Martin Berkemeier; et al: ''World Directory of Leisure Aviation 2011-12'', page 220. WDLA UK, Lancaster UK, 2011. ISSN 1368-485X</ref>

SDB was an enterprise of the [[Moscow State Technical University of Civil Aviation]]. The SDB website has been removed from the internet and the enterprise seems to have gone out of business, ending production of the Karat.<ref name="WDLA11" /><ref>[[Internet Archive]], [https://web.archive.org/web/*/http://www.sdbmstu.agava.ru Archives for www.sdbmstu.agava.ru], dated 29 August 2013, retrieved 29 August 2013</ref>

==Design and development== The Karat is a [[nanotrike]] that was designed to comply with the US [[FAR 103 Ultralight Vehicles]] rules, including the category's maximum empty weight of {{convert|254|lb|kg|0|abbr=on}}. The aircraft has a standard empty weight of {{convert|201|lb|kg|0|abbr=on}}. It features a [[Flying wires|cable-braced]] [[hang glider]]-style [[high-wing]], weight-shift controls, a single-seat open cockpit without a [[cockpit fairing]], [[tricycle landing gear]] and a single engine in [[pusher configuration]].<ref name="WDLA11" />

The aircraft is made from bolted-together [[aluminum]] tubing, with its single or double surface wing covered in [[Dacron]] sailcloth. It was designed to be light enough to accept any hang glider wing with a high enough gross weight. A typical wing used would have a {{convert|9.8|m|ft|1|abbr=on}} span, be supported by a single tube-type [[kingpost]] and use an "A" frame weight-shift control bar. The standard powerplant is a single cylinder, air-cooled, [[two-stroke]], {{convert|28|hp|kW|0|abbr=on}} [[Hirth F33]] engine. The aircraft has an empty weight of {{convert|91|kg|lb|0|abbr=on}} and a gross weight of {{convert|220|kg|lb|0|abbr=on}}, giving a useful load of {{convert|129|kg|lb|0|abbr=on}}. With full fuel of {{convert|30|L}} the payload is {{convert|107|kg|lb|0|abbr=on}}.<ref name="WDLA11" />

When it was available the trike was sold as a fuselage frame and engine, with the customer providing the hang glider wing.<ref name="WDLA11" />

==Specifications (Karat) == {{Aircraft specs |ref=Bayerl<ref name="WDLA11" /> |prime units?=met  |genhide=

|crew=one |capacity= |length m= |length ft= |length in= |length note= |span m=9.8 |span ft= |span in= |span note= |height m= |height ft= |height in= |height note= |wing area sqm=10.0 |wing area sqft= |wing area note= |aspect ratio= |airfoil= |empty weight kg=91 |empty weight lb= |empty weight note= |gross weight kg=220 |gross weight lb= |gross weight note= |fuel capacity={{convert|30|L}} |more general=  |eng1 number=1 |eng1 name=[[Hirth F33]] |eng1 type=single cylinder, air-cooled, [[two stroke]] [[aircraft engine]] |eng1 kw= |eng1 hp=28

|perfhide=

|max speed kmh=125 |max speed mph= |max speed kts= |max speed note= |cruise speed kmh=90 |cruise speed mph= |cruise speed kts= |cruise speed note= |stall speed kmh=45 |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= |range miles= |range nmi= |range note= |endurance= |ceiling m= |ceiling ft= |ceiling note= |g limits= |roll rate= |glide ratio= |climb rate ms=2.1 |climb rate ftmin= |climb rate note= |time to altitude= |sink rate ms= |sink rate ftmin= |sink rate note= |lift to drag= |wing loading kg/m2=22.0 |wing loading lb/sqft= |wing loading note= |power/mass= |thrust/weight= |more performance= |avionics= }}

==References== {{reflist}}

==External links== *[https://web.archive.org/web/*/http://www.sdbmstu.agava.ru Company website archives] on [[Archive.org]] *[https://web.archive.org/web/20131217235501/http://www.appulma.org/images/karat_sdb.jpg Photo of the SDB Karat]

[[Category:2000s Russian sport aircraft]] [[Category:2000s Russian ultralight aircraft]] [[Category:Single-engined pusher aircraft]] [[Category:Ultralight trikes]]