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| S-54 | |
|---|---|
| Sketch of the S-54 in its original trainer form. | |
| Role | trainer / light fighter |
| National origin | Russian Federation |
| Manufacturer | Sukhoi |
The Sukhoi S-54 was a series of three closely related aircraft proposals; the S-54trainer aircraft, S-55light fighter designed for export, and the S-56 carrier-capable light fighter. All members of the family resemble the Sukhoi Su-27 in general form, or the Sukhoi Su-33 more closely, but built around a single Saturn AL-31 engine instead of two, and scaled down accordingly to a smaller layout. The design was offered to several potential customers, including South Africa and India, but was turned down. Development is apparently on hold, awaiting a launch customer.
Design and development[edit]
Genesis[edit]
The project traces its origins to a 1990 requirement to replace the aging Aero L-39 jet trainers, which were reaching the end of their service lives. The Aero L-29 had originally been selected as a Warsaw Pact standard trainer in 1961, in preference to the Yak-30 and PZL TS-11 Iskra. It started to be replaced in 1974 by the greatly updated L-39, powered by the new Ivchenko AI-25 engine. By 1990 the Soviet Air Force had about 1,000 L-39s on force, when the new Czech Republic stated they would no longer be supplying spares.[1]
The Soviet Air Force's commander-in-chief, Air Marshal Yefimov, issued a statement on the issue on 20 April 1990. On 25 June 1990 the first official RFP document was issued for the Uchebno-Trenirovochnyi Samolyot (UTS) program. Four companies responded with designs, the Mikoyan MiG-AT, Yakovlev Yak-130 (then known as the Yak-UTS), the Myasischev M-200 and the S-54. Most of these designs were typical trainers; they were built to be docile in handling, low cost in operation, and were essentially all-new in design.
Sukhoi decided to take a different approach, and develop a true high-performance design closer to a fighter than a trainer. Advances in aerodynamics and flight controls allowed even the most advanced fighters have docile handling suitable for transition training, while at the same time the older generation aircraft had handling so different from modern aircraft that it gave them limited utility. Given their extensive experience with upgraded versions of the original Su-27, Sukhoi chose to use much of this design in the new trainer. Versions with one AL-31 or two smaller engines were studied, with the single-engine version favoured throughout.[2]
The design that emerged appeared to be a Su-33 with a fuselage plug removed behind the cockpit, giving it a cross-section similar to other advanced trainers of the era. The first design study, shown publicly not long afterwards, was upgraded and improved during 1992. A new version, with airframe enlarged by approximately 25 per cent, was revealed at 1996 Farnborough Air Show.
The Yak-130 eventually won the UTS contract, and Sukhoi started looking for other markets.
S-55 and S-56[edit]
Sukhoi then modified the design to allow it to mount the same radar as the Su-27, the Phazotron Sokol. Shown in June 1997, the S-55 was a lighter, shorter-range fighter that complemented the Su-27 in the same way the F-16 complements the F-15. Designed as a low-cost fighter, primarily for export, the S-55 was nevertheless a very advanced design compared to similar fighters that were 'up-converted' from trainers.[citation needed]
Sukhoi also produced the S-56, essentially an S-55 adapted for carrier use. The design was deliberately tailored for the Admiral Kuznetsov, and was designed to fit into a 10 by 3 by 3 meter space, making it one of the most compact naval fighters ever designed. The small size, especially vertically, opened the possibility of adding another internal deck between the two existing aircraft decks in the Kuznetsov, increasing the total number of fighters that could be carried by two to three times.[3] The S-56 was also offered to the Indian Navy in 1999, but was not purchased.
Specifications[edit]
General characteristics
- Crew: 1-2
- Length: 12.3 m (40 ft 4 in)
- Wingspan: 9.8 m (32 ft 2 in)
- Height: 4.47 m (14 ft 8 in)
- Wing area: 26.42 m2 (284.4 sq ft)
- Empty weight: 4,200 kg (9,259 lb)
- Max takeoff weight: 9,410 kg (20,745 lb)
- Powerplant: 1 × Saturn AL-31FL afterburning turbofan engine, 74.5 kN (16,700 lbf) thrust dry, 122.58 kN (27,560 lbf) with afterburner
Performance
Sketch 54 100 Simplified
- Maximum speed: 1,660 km/h (1,030 mph, 900 kn) / M1.56 at high altitude
- 1,200 km/h (750 mph; 650 kn) / M0.98 at sea level
- Range: 2,000 km (1,200 mi, 1,100 nmi) at altitude
- Service ceiling: 18,000 m (59,000 ft)
- g limits:+9
- Rate of climb: 230 m/s (45,000 ft/min)
Armament
(light fighter versions) a variety of bombs rockets and missiles on external hardpoints
See also[edit]
Related development
Aircraft of comparable role, configuration, and era
References[edit]
- ^'Sukhoi S-54 / S-55 / S-56 Family'. www.globalsecurity.org. Retrieved 23 January 2019.
- ^'Ľahké ruské stíhačky 4,5 a 5. generácie'. www.hitechweb.genezis.eu. Retrieved 23 January 2019.
- ^https://mdb.cast.ru/mdb/3-2001/di/sgpst/?form=print
External links[edit]
- 'Sukhoi S-54 Trainer', globalsecurity.org
- 'Sukhoi S-56 Shipborne Fighter', globalsecurity.org
- 'Sukhoi Reveals Light Fighter Based on S-54', Jane's Defence Weekly, 25 June 1997
Sketch 54 100 As A
Released 09 April, 2019 – read release notes
Changes
colors and gradients properties have been added on Document and globalAssets
GitHub pull request #345 and #398
sketch.globalAssetsproperty was added- Two new asset types were added
ColorAsset- name, type: String (can be null)
- color, type: String
GradientAsset- name, type: String (can be null)
- gradient, type: Gradient
Usage
Setting Global Colors (Be sure to save a copy of your global assets before playing with this!)
Note that this doesn't work
Other useful actions
Similarily for Gradients
Setting Global Gradients
Similarly, document colors and document gradients can all be found on Document
Shared styles are now document properties and can be mutated
Two new properties on document (try not to get them mixed up as the styles are subtly different!)
sharedLayerStylessharedTextStyles
Usage
Setting a Shared Style
layer.index can now be set
You can set the index of the layer to move it in the hierarchy. Note that you also have layer.moveToFront(), layer.moveForward(), layer.moveToBack(), and layer.moveBackward()
Usage
aspectRatio property has been added to Gradient
When the gradient is Radial, the from and to points makes one axis of the ellipse of the gradient while the aspect ratio determines the length of the orthogonal axis (aspectRatio 1 means that it's a circle).
Usage
selected property and getFrame method have been added on an Symbol override
The frame of an override can be different than the frame of its affected Layer in case where the Symbol Instance has been scaled or, in the case of the example below, the text value is changed for the Symbol instance resulting in a shorter frame.
Usage
layer.duplicate now works on a layer with no parent
Previously you needed to have a parent in order to duplicate the layer. Now you are free to do so without working around this.
Usage
symbolInstance.master now works on an immutable instance
If you ever got an MSImmutableSymbolInstance object and attempted to wrap the native sketch object then you would have previously gotten an error. It has now been fixed.
You can now remove flow targets with setting flow as undefined on a Layer
Previously you couldn't remove a flow target. Now you can!
Usage
pattern properties have been added to Fill
Previously this also applied to the noise property as well but Sketch has depreciated the noise fill option in favor of having the noise patterns be image fills.
Usage
An image buffer can now be used with ImageData
This change helps with the next one (Export now returns a buffer if output is false)
export now returns a Buffer if options.output is false and options.formats is an image format
If you ever wanted to get at the thumbnail preview image data when something is marked for export you can do so with this new API functionality.
See this issue for more info why this was added.
Quick Summary of Sketch's export options
The method returns
undefinedifoptions.outputisundefinedor a string- an array of
BufferifobjectToExportis an array andoptions.formatsis an image format - an array of
ObjectifobjectToExportis an array andoptions.formatsis json - a
BufferifobjectToExportis a single item andoptions.formatsis an image format - an
ObjectifobjectToExportis a single item andoptions.formatsis json
Usage
getSelectedDocument will try harder to find your document
If you are using SKPM, SKPM defines context as a global so it will prefer to use that first. If there is no current document (via NSDocumentController.sharedDocumentController().currentDocument() then Sketch will attempt to use NSApplication.sharedApplication().orderedDocuments(). Ultimately, you don't really need to know too much about these underlying changes but it is useful to know that .getSelectedDocument() should work reliabily. If its not, be sure to file an issue.
console.clear will now clear the DevTools console
Use console.clear() to clean up your console.
selectedPage and selectedLayers can now be set on the Document
Previously these were read-only properties. However, now you can pass in a layer or a page to these objects to set them.
Usage
Add some methods to deal with the Symbols Page
The 'Symbols' page is similar to other pages. The only way it is specific is when creating a Symbol, Sketch will ask the user if they want to move it to that page. You can put Symbols in any page but if you want to respect the convention Sketch put in place, here are a few methods to help you do so.
Adds a few methods on Page
getSymbolsPage(document)- Returns a Page or
undefinedif there is no Symbols page yet
- Returns a Page or
createSymbolsPage()- Returns a Page
isSymbolsPage()- Returns a
boolean
- Returns a
Usage
Note that .createSymbolsPage() won't prevent you from creating multiple pages that are titled 'Symbols'.
If you have multiple pages with 'Symbols' I believe that .isSymbolsPage() will only be true for the earliest created page with the title 'Symbols'. Under the hood the API is using:
Related resources
