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DanielR Profile picture
@DanielR33187703
Oct 28 • 6 tweets • 3 min read Twitter logo Read on Twitter
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🧵1. A captured #Russian first-person-video #drone was carrying three charges from rocket-propelled grenades. This is a lot of weight for a small drone to carry. A previous captured drone carried a 4.8 kg explosive.
t.me/serhii_flash/1…
Image
2. These hobby-grade drones were never meant to carry a payload. Instead they were meant to be fast. How are they now carrying such large payloads? Image
3. A casual inspection shows a fairly standard quadcopter drone. The frame is made from carbon fibre and there are a few 3D-printed parts but nothing special. (The video transmitter & ELRS receiver require a closer look but that’s a different thread.) Image
4. However a closer inspection reveals a very simple modification. Each of the arms holding a motor has been reinforced with a rectangular carbon rod. Each rod is held in place with heat-shrink tubing.
t.me/serhii_flash/1…
Image
5. A rod runs the full length of each arm. This is a very inexpensive and easy modification that greatly enhances the performance of the drone. We are seeing more modifications and customizations of drones as the war progresses. Image
6. (ps) I am bewildered why a thread on using heat-shrink tubing got 30,000 impressions. If you liked this, please have a look at my previous posts.

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More from @DanielR33187703

DanielR Profile picture
Oct 24
🧵1. In the #UkraineRussiaWar war there is discussion on how cheap first-person video (FPV) #drones can strike many km behind front lines and be resistant to electronic countermeasures. One technique that can help is using a second drone as a repeater.

2. To see how this works, consider how a drone normally communicates. The control signals sent to the drone are completely independent from the video signal transmitted from the drone. Control signals usually use something called ExpressLRS. Schematic showing signals controlling a FPV drone and video signal transmitted by the drone.
3. ExpressLRS is open source but based on proprietary hardware made by Semtech. Often referred to as LoRa (for long range), it uses SX1280, SX1281, SX1276 & similar integrated circuits. LoRa is very good & capable of very long range communication.

expresslrs.org
Read 13 tweets
DanielR Profile picture
Sep 27
🧵1. In the #UkraineRussia war, volunteers assemble #drones for military use. Most components are imported from China but some are made locally. Russian volunteers (kb70ru Конструкторское дизайн бюро) designed a drone that uses a frame made from plywood.
vk.com/kb70ru
Russian plywood FPV drone frame.
2. A computer-controlled router is used to cut the drone frames out of 9mm thick plywood.
t.me/kb70ru/366
CNC router cutting a drone frame.
3. A laser cutter is used to cut parts out thinner plywood. The laser cutter is more accurate but is limited to cutting thinner materials. Image
Read 15 tweets
DanielR Profile picture
Sep 12
🧵1. Most of the low-cost FPV #drones used in the #UkraineRussian war are assembled from hobby-grade components. Independent radios are used for video and control. Importantly, these radios were never intended for military use. Schematic showing the radio signals used for a simple drone.
2. Simple (usually analogue) video transmission is used. Shown is a very small & inexpensive first-person video (FPV) system. Combat drones use a larger, more powerful transmitter but are otherwise similar. Photo showing a video camera and transmitter used in a drone.
3. FYI, the video antenna on the drone is almost always circularly polarized, which makes it easy to identify. The antenna often looks like a plastic ball on a stick but could also look like a wire mesh. Photograph of video antennas used in FPV drones.
Read 10 tweets
DanielR Profile picture
Sep 6
🧵1. This is a follow up on an earlier thread about the cardboard Corvo #drone built by Sypaq Systems. This drone is used by #Ukraine and is designed for "covert delivery of small volume payloads".

2. A Corvo drone was found intact by Russian forces. Typically, drones fly into or drop munitions on a target. A careful look at these photos suggest Ukraine is doing something different.

t.me/Mestb_Dobroj_V…
Corvo #drone built by Sypaq System that has crashed.
3. The exterior of the drone shows a pitot tube for measuring airspeed. It also shows a radio receiver that could be used to detonate onboard explosives. There is no indication of a camera or antennas. Corvos drone showing pitot tube for measuring airspeed. It also shows a radio receiver.
Read 9 tweets

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