DanielR Profile picture
Dec 5, 2024 18 tweets 7 min read Read on X
1. A curious Ukrainian drone that crashed in September, 2024 was widely reported in russian media. Although various folks claimed this wreckage showed the remains of a jet engine, things did not look right. Image
2. Here is a closer view of this object. The trouble is that most jet engines used in drones do not look like this. If not an engine, what is this? The following photographs will (partially) explain what this is. Image
3. This is a rare photo showing an intact example of this jet-powered drone. Wing span is roughly 3 m (10 feet). The airframe is made from carbon fibre. The overall design is really intriguing. Image
4. With covers removed, the right bay holds a flight controller & radios. Note the 2 adjacent antenna connectors. Left bay holds fuel & engine management systems. The jet engine is in the middle and has extra thermal insulation. Image
5. The engine is a model SW400pro made by the Chinese company Swiwin. It’s about 15 cm (5.8”) in diameter, giving an estimate of the drone’s size. In some photos it looks like the smaller SW300pro (possibly both are used). It burns 12 L (3.2 US gallons) of fuel in 10 minutes so cannot fly very far.Image
6. The thing that some folks thought was an engine appears to be a warhead. It is about 28 cm long and 11.5 cm in diameter. Curiously, two hoses lead from the warhead to the pitot tubes. Image
7. The boot in this photo provides a better sense of the warhead’s size. The tubes are colour-coded: likely one is total pressure and one is static pressure. There are wires but it is hard to sort them out from this photo. The “not sure” part may be a switch. Image
8. The warhead has a nice casting containing electro-mechanical components. Two 9-volt batteries provide power. An electrical connector likely goes to the external wires. Unexpectedly there is a wind-up timer switch, model MI2, made by Faucigny Instruments. Image
9. Here is a better view of the mechanical timer. Also shown is a differential pressure switch, model DesignFlex PSF100A, by World Magnetics. This connects to the pitot tubes and switches at pressure of 3” water, possibly to arm only once the drone is flying. Image
10. One of the drone’s bays holds the battery and a Swiwin engine control unit. Other than a Taoglas (possibly Iridium) antenna, there is nothing obviously unusual. The opposite bay is a different story. Image
11. There is a lot going on here. The flight controller is a common CubePilot Orange+ that is connected to a (fancy) PowerBox SR2. GPS is a Sparkfun (really?) u-blox NEO M9N. There is also a Matek magnetometer. Hidden in the rear is a heap of power-management stuff. Image
12. There is no sign of a camera on this drone. Curiously, there are two communication systems. There is a common RFD900 long-range radio modem. There is also a RockBlock Iridium satellite modem but it’s not clear how this would be used given its very low data rate. Image
13. There are no custom electronics. Zero. Everything inside this drone can be bought from hobby stores. All of it. Regardless, whoever, put this drone together really liked their CAD software. Everything is nicely planned, well-made and labelled. Image
14. A recent photo shows the wiring harness from this jet drone along with a flight controller made by the American company, Aevex Aerospace. It is extremely unlikely the jet drone is made by Aevex. These components are almost certainly from different crashes. Image
15. So then, who made this jet? One hint is the modem case & pitot tube mount look like they were printed on a powder-bed 3D printer. It’s someone who likes mechanical engineering and knows how to work with carbon fibre but are less keen on designing circuit boards. Image
16. Mechanically, this is a very interesting drone. However, its maker remains a mystery.
If you liked this thread, please bookmark it and repost as a quote. Also, please see my previous threads listed under “highlights”. Respectful comments are always appreciated. Image
17. (ps) Please comment if you know more about the warhead. Regarding Aevex not being the maker of this jet, it is difficult to imagine an American maker of military drones using a Chinese engine. Also, labelling & general design of the jet is very different from the Disruptor.
18. (ps) For completeness, the thing labelled “not sure” in #8 is likely a detonator like those shown here. This warhead also resembles (roughly) the warhead used in a Hellfire missile. Image

• • •

Missing some Tweet in this thread? You can try to force a refresh
 

Keep Current with DanielR

DanielR Profile picture

Stay in touch and get notified when new unrolls are available from this author!

Read all threads

This Thread may be Removed Anytime!

PDF

Twitter may remove this content at anytime! Save it as PDF for later use!

Try unrolling a thread yourself!

how to unroll video
  1. Follow @ThreadReaderApp to mention us!

  2. From a Twitter thread mention us with a keyword "unroll"
@threadreaderapp unroll

Practice here first or read more on our help page!

More from @DanielR33187703

Feb 21
1. Combining a low-cost drone with a fibre-optic communication link produces a formidable weapon that is impervious to electronic defenses. Here is a look at how a small Chinese company called Skywalker developed an easy-to-use fibre-optic kit that has changed the war. Image
2. Skywalker posted several videos while developing fibre optics for drones. The first was a short-range, e.g. 100 metres, test in June 12, 2024. The spool of fibre optic was not on the drone but remained on the ground. A rod prevented the fibre from tangling in the propellers. Image
3. The first video also showed a number of landmarks that help determine its location. The large building in the background is part of a pharmaceutical industrial park. Image
Read 33 tweets
Feb 16
1. Part 3 of Making Money from a War visits an office with a fantastic view. The Chinese company, Skywalker posted a number of videos including one from a fancy office building. A close look produces questions. Image
2. Skywalker posted a video showing how to attach a bomb release to a pricey (€13500) DJI Matrice 300 drone. It holds two rounds under the drone with a control module mounted on the top of the drone. There is also an excellent view from the office windows. Image
3. One question is, where is this office? The shadows suggest this view is towards the west. There is a straight road close to a water front and a group of very tall buildings is seen in the distance. A large, low building is at the bottom of the photo. Image
Read 16 tweets
Feb 13
1. Part 1 of this series looked at a video posted by the Chinese company Skywalker Technology. The video pointed to a company called DSTech UAS. Part 1 showed their factory and offices. Image
2. Now that the company with three names (DSI Drone System Innos, DSTech UAS, Dongshengtai Technology) has been introduced, let’s look at what they are up to. They make their own fixed-wing drones starting with moulds. Image
3. Making these drones involves a lot of hand work: notice the lack of powered equipment. Here, vacuum bags are used to press the material into the mould. This company uses both fibreglass and carbon fibre for its drones. Image
Read 15 tweets
Feb 12
A number of companies have been making money from the war in Ukraine. This is a series of threads that look at various videos posted by two companies who supply equipment related to drones. The goal is to obtain a better idea of what is happening. Image
1. The Chinese company Skywalker Technology sells kits for controlling drones using fibre optics. Shown here is a quadrotor with a spool holding a few km of optical fibre. The fibre leads to a base station so control signals can be sent to the drone and video sent back. Image
2. In April 2024 Skywalker posted a video showing a heavy drone carrying mortar shells over what appears to be an abandoned building site beside an orchard and greenhouses. There are logos for Skywalker and a company called Drone System Innos (DSI). Who is DSI? Image
Read 21 tweets
Dec 10, 2024
1. A good defense against a drone is another drone. Both Ukraine and russia are developing net launchers that tangle an enemy drone’s propellers. Shown here is a russian-designed net launcher made largely from 3D-printed components. These are carried by a drone. Image
2. When triggered, four springs eject four weights that are attached to the net. The net simply hangs below this launcher. The release is a ring that slides upwards when moved by a servo. Image
3. This gives a better view of the release mechanism. The release is a ring that prevents the 4 weights from being ejected by the springs. This ring is connected to the servo via a link. The servo can then pull the release ring upwards along the cylindrical body of the launcher. Image
Read 7 tweets
Dec 6, 2024
1. There was a pleasant and interesting surprise today when Ukraine announced a new drone missile called Peklo (Hell). It will take a while to analyse this weapon but there are a number of intriguing design elements. Image
2. This photo gives a good idea of its size. Range is reported as over 700 km so this drone must hold a very large fuel tank. The size of the warhead will likely depend on the required range. Speed is reported as over 700 km/h (435 mph). Image
3. The most obvious detail is the engine is mounted on top of the drone. This engine is similar to the PBS TJ40 but could be customised for this drone. The external engine greatly simplifies the design and also allows a different make or model of engine to be used. Image
Read 8 tweets

Did Thread Reader help you today?

Support us! We are indie developers!


This site is made by just two indie developers on a laptop doing marketing, support and development! Read more about the story.

Become a Premium Member ($3/month or $30/year) and get exclusive features!

Become Premium

Don't want to be a Premium member but still want to support us?

Make a small donation by buying us coffee ($5) or help with server cost ($10)

Donate via Paypal

Or Donate anonymously using crypto!

Ethereum

0xfe58350B80634f60Fa6Dc149a72b4DFbc17D341E copy

Bitcoin

3ATGMxNzCUFzxpMCHL5sWSt4DVtS8UqXpi copy

Thank you for your support!

Follow Us!

:(