# Sunward STB

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Chinese amphibious ultralight trike

STB General information Type Ultralight trike National origin China Manufacturer Sunward Tech Status In production (2018)

The **Sunward STB** is a Chinese [amphibious](/source/Amphibious_aircraft) [ultralight trike](/source/Ultralight_trike), designed and produced by [Sunward Tech](https://en.wikipedia.org/w/index.php?title=Sunward_Tech&action=edit&redlink=1) (Hunan Sunward Science & Technologies Company Limited) of [Zhuzhou](/source/Zhuzhou). The aircraft is supplied complete and ready-to-fly.[1]

## Design and development

The STB is intended for the [search and rescue](/source/Search_and_rescue) role, as well as tourist flights and recreational use. It was designed to comply with the [Fédération Aéronautique Internationale](/source/F%C3%A9d%C3%A9ration_A%C3%A9ronautique_Internationale) [microlight](/source/Microlight) category, including the category's maximum gross weight of 450 kg (992 lb). The aircraft has a maximum gross weight of 450 kg (992 lb).[1]

The aircraft design features a [strut-braced](/source/Strut-braced) [hang glider](/source/Hang_glider)-style [high-wing](/source/High-wing), weight-shift controls, a two-seats-in-[tandem](/source/Tandem) open cockpit with a rigid boat hull, retractable [tricycle landing gear](/source/Tricycle_landing_gear) and a single engine in [pusher configuration](/source/Pusher_configuration). The boat hull was designed for use in higher wave conditions.[1]

The aircraft is made from bolted-together [aluminum](/source/Aluminum) tubing and composites. It uses a double surface [Grif Hazard](https://en.wikipedia.org/w/index.php?title=Grif_Hazard&action=edit&redlink=1) wing, made by the Italian company [Grif Italia](/source/Grif_Italia). The 10.35 m (34.0 ft) span wing is supported by struts and uses an "A" frame weight-shift control bar. The powerplant is an Austrian-made twin cylinder, liquid-cooled, [two-stroke](/source/Two-stroke), [dual-ignition](/source/Dual-ignition) 64 hp (48 kW) [Rotax 582](/source/Rotax_582) engine or four cylinder, air and liquid-cooled, [four-stroke](/source/Four-stroke), dual-ignition 80 hp (60 kW) [Rotax 912UL](/source/Rotax_912UL) engine.[1]

The aircraft has an empty weight of 248 kg (547 lb) and a gross weight of 450 kg (992 lb), giving a useful load of 202 kg (445 lb). With full fuel of 60 litres (13 imp gal; 16 US gal) the payload is 159 kg (351 lb).[1]

## Variants

**STB582**
- Model with a 64 hp (48 kW) [Rotax 582](/source/Rotax_582) engine.[1]

**STB912**
- Model with an 80 hp (60 kW) [Rotax 912UL](/source/Rotax_912UL) engine.[1]

## Specifications (STB582)

*Data from* Tacke[1]

**General characteristics**

- **Crew:** one

- **Capacity:** one passenger

- **Wingspan:** 10.35 m (33 ft 11 in)

- **Wing area:** 15 m2 (160 sq ft)

- **Empty weight:** 248 kg (547 lb)

- **Gross weight:** 450 kg (992 lb)

- **Fuel capacity:** 60 litres (13 imp gal; 16 US gal)

- **Powerplant:** 1 × [Rotax 582](/source/Rotax_582) twin cylinder, liquid-cooled, [two stroke](/source/Two_stroke) [aircraft engine](/source/Aircraft_engine), 48 kW (64 hp)

- **Propellers:** 3-bladed composite

**Performance**

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

- **Cruise speed:** 60 km/h (37 mph, 32 kn)

- **Stall speed:** 38 km/h (24 mph, 21 kn)

- **Wing loading:** 30 kg/m2 (6.1 lb/sq ft)

## See also

- [Sunward ST](/source/Sunward_ST)

## References

1. ^ [***a***](#cite_ref-WDLA15_1-0) [***b***](#cite_ref-WDLA15_1-1) [***c***](#cite_ref-WDLA15_1-2) [***d***](#cite_ref-WDLA15_1-3) [***e***](#cite_ref-WDLA15_1-4) [***f***](#cite_ref-WDLA15_1-5) [***g***](#cite_ref-WDLA15_1-6) [***h***](#cite_ref-WDLA15_1-7) Tacke, Willi; Marino Boric; et al: *World Directory of Light Aviation 2015-16*, page 242. Flying Pages Europe SARL, 2015. [ISSN](/source/ISSN_(identifier)) [1368-485X](https://search.worldcat.org/issn/1368-485X)

## External links

- [Official website](http://www.sunwardtech.com/product/pgaishu-detail.jsp?id=2378)

v t e Sunward Tech Light aircraft Sunward SA 60L Aurora Ultralight trikes Sunward ST Sunward STB

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