# SDB Karat

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Russian ultralight trike

Karat General information Type Ultralight trike National origin Russia Manufacturer SDB Status Production completed

The **SDB Karat** is a Russian [ultralight trike](/source/Ultralight_trike) that was designed and produced by [SDB](https://en.wikipedia.org/w/index.php?title=SDB_(Moscow_State_Technical_University_of_Civil_Aviation)&action=edit&redlink=1) of [Moscow](/source/Moscow). The aircraft was supplied as a complete ready-to-fly-aircraft.[1]

SDB was an enterprise of the [Moscow State Technical University of Civil Aviation](/source/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.[1][2]

## Design and development

The Karat is a [nanotrike](/source/Nanotrike) that was designed to comply with the US [FAR 103 Ultralight Vehicles](/source/FAR_103_Ultralight_Vehicles) rules, including the category's maximum empty weight of 254 lb (115 kg). The aircraft has a standard empty weight of 201 lb (91 kg). It features a [cable-braced](/source/Flying_wires) [hang glider](/source/Hang_glider)-style [high-wing](/source/High-wing), weight-shift controls, a single-seat open cockpit without a [cockpit fairing](/source/Cockpit_fairing), [tricycle landing gear](/source/Tricycle_landing_gear) and a single engine in [pusher configuration](/source/Pusher_configuration).[1]

The aircraft is made from bolted-together [aluminum](/source/Aluminum) tubing, with its single or double surface wing covered in [Dacron](/source/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 9.8 m (32.2 ft) span, be supported by a single tube-type [kingpost](/source/Kingpost) and use an "A" frame weight-shift control bar. The standard powerplant is a single cylinder, air-cooled, [two-stroke](/source/Two-stroke), 28 hp (21 kW) [Hirth F33](/source/Hirth_F33) engine. The aircraft has an empty weight of 91 kg (201 lb) and a gross weight of 220 kg (485 lb), giving a useful load of 129 kg (284 lb). With full fuel of 30 litres (6.6 imp gal; 7.9 US gal) the payload is 107 kg (236 lb).[1]

When it was available the trike was sold as a fuselage frame and engine, with the customer providing the hang glider wing.[1]

## Specifications (Karat)

*Data from* Bayerl[1]

**General characteristics**

- **Crew:** one

- **Wingspan:** 9.8 m (32 ft 2 in)

- **Wing area:** 10.0 m2 (108 sq ft)

- **Empty weight:** 91 kg (201 lb)

- **Gross weight:** 220 kg (485 lb)

- **Fuel capacity:** 30 litres (6.6 imp gal; 7.9 US gal)

- **Powerplant:** 1 × [Hirth F33](/source/Hirth_F33) single cylinder, air-cooled, [two stroke](/source/Two_stroke) [aircraft engine](/source/Aircraft_engine), 21 kW (28 hp)

- **Propellers:** 2-bladed wooden

**Performance**

- **Maximum speed:** 125 km/h (78 mph, 67 kn)

- **Cruise speed:** 90 km/h (56 mph, 49 kn)

- **Stall speed:** 45 km/h (28 mph, 24 kn)

- **Rate of climb:** 2.1 m/s (410 ft/min)

- **Wing loading:** 22.0 kg/m2 (4.5 lb/sq ft)

## References

1. ^ [***a***](#cite_ref-WDLA11_1-0) [***b***](#cite_ref-WDLA11_1-1) [***c***](#cite_ref-WDLA11_1-2) [***d***](#cite_ref-WDLA11_1-3) [***e***](#cite_ref-WDLA11_1-4) [***f***](#cite_ref-WDLA11_1-5) Bayerl, Robby; Martin Berkemeier; et al: *World Directory of Leisure Aviation 2011-12*, page 220. WDLA UK, Lancaster UK, 2011. ISSN 1368-485X

1. **[^](#cite_ref-2)** [Internet Archive](/source/Internet_Archive), [Archives for www.sdbmstu.agava.ru](https://web.archive.org/web/*/http://www.sdbmstu.agava.ru), dated 29 August 2013, retrieved 29 August 2013

## External links

- [Company website archives](https://web.archive.org/web/*/http://www.sdbmstu.agava.ru) on [Archive.org](/source/Archive.org)

- [Photo of the SDB Karat](https://web.archive.org/web/20131217235501/http://www.appulma.org/images/karat_sdb.jpg)

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Adapted from the Wikipedia article [SDB Karat](https://en.wikipedia.org/wiki/SDB_Karat) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/SDB_Karat?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.