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Oct 3 17 tweets 6 min read Read on X
1. Why is a russian soldier very happy to receive an 8-year-old NanFang 150 cc motorcycle? The answer has a lot to do with #drones and why speed matters. Image
2. In #Ukraine, armed drones are deployed by the thousands, and constantly attack vehicles & soldiers. Without costly electronic countermeasures, small drones are difficult to defend against. Image
3. These drones are mostly repurposed hobby-grade toys that were never intended for this application. For combat, they have to carry a heavy munition & heavy battery many km, and then chase down a target. All that weight limits its top speed to about 100 km/h. Image
4. Large, slow-moving vehicles like this russian beauty are easy prey for FPV drones. FYI, this is a UAZ-39094, which is a truck variant of the more common Loaf van. It has 112 HP and is unlikely to be very fast when loaded. At least 20 of these have been destroyed in Ukraine. Image
5. Off-road motorcycles have become popular with both sides in Ukraine because these bikes are small & fast. Here, one lucky russian is using a 250 cc (enduro?) motorcycle. Two other russians have scooters (with street tires) that will not last long. Image
6. Most of the russian soldiers’ motorcycles are donated like the bikes shown here. These ones are decent and have a top speed of 140 km/h, which in principle is fast enough to outrun most FPV drones. But there are nuances. Image
7. Larger vehicles are quickly destroyed by drones so russians are using motorcycles to transport fairly heavy loads including water and ammunition. This weight will make the bikes much harder to drive at speed. (Transporting ammunition in a water bottle is an interesting idea.) Image
8. Sometimes the loads are very heavy like carrying two mortar rounds. It would be really difficult to maintain speed with this load. Even then, two rounds are not very much ammunition. Using motorcycles for logistics also requires many trips. Image
9. The roads are often extremely rough as shown by these 3 frames taken from a russian video. There are a lot of burned russian vehicles and debris. When wet, this road will be muddy and almost impossible for motorcycles. Image
10. Bikes are also fairly fragile, easily damaged but not easy to fix. This one (a Chinese-made Champ) was damaged by a small anti-personnel mine. Spare parts & maintenance for these in a warzone will be difficult. Image
11. The russians also use motorcycles on the frontline for assaults. Here, a russian with a gun has a new (likely donated) motorcycle. This bike is made by Racer who assembles these in russia from random imported parts. Top speed is listed as 120 km/h. Image
12. This photo gives an idea of how well motorcycles work for russian assaults. Notice how the 22 burned motorcycles are clustered around armoured vehicles, like the riders were trying to find cover. Travelling tightly grouped with slower-moving armour seems a bad idea. Image
13. As mentioned, motorcycles are easily damaged, and with that goal Ukraine has been using drones to place small mines. Because these mines are small, a single drone can drop several along a road. Image
14. In principle, motorcycles are fast enough to outrun a FPV drone. However, this requires a skilled rider. There are many videos where the rider did not or could not ride fast enough. Here is an image from a FPV drone that chased down a motorcycle. Image
15. Perhaps most of the russian’s motorcycles are donated. Many of these, like the street bikes shown here, are wildly unsuitable for the terrain. These bikes would be almost unrideable in loose dirt & mud. (If you recognise this model of bike, please comment.) Image
16. How did the happy rider in #1 fair? His NanFang 150 -5A had a top speed (when new) of 90 km/h, so perhaps not so well. Speaking of unlucky, it sure looks like the russian soldier in this photo is riding a kid’s dirt bike. Image
17. In summary, outrunning a drone is possible but hard. If you found this thread useful, please repost as a quote. Respectful comments are welcome. Also consider reading my previous threads listed under “Highlights”.

PS, if you know what is in these pails, please comment. Image

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More from @DanielR33187703

Oct 1
1. A russian solder with a machine gun is riding a curious-looking vehicle. What is this? Is it a fancy russian military thing? Image
2. Turns out the russian soldier is using an electric mobility scooter. These come in various configurations. The russian got lucky as his scooter has the optional golf-cart tires, which will be helpful in a war zone. Image
3. These scooters are also available in high-visibility colours. Note that this yellow one has the same brace as the russian’s scooter. Top speed is about 45 km/h, which will amuse Ukrainian drone pilots. Image
Read 4 tweets
Sep 17
1. Ukraine crowd-sourced a multi-role drone called Besomar (a powerful demon). Like many small drones in Ukraine the Besomar was developed at very low cost, i.e., UAH600k (US$15k). Half of the money came from donations and half from government. @sambendett Image
2. The Besomar is not very big with an approximately 2 m wingspan. It can be launched from a rail or by hand. With current electronics, flight time is 60 minutes and the range (distance from base station) is 30 km. Image
3. The design is conventional and will be familiar to builders of RC planes. A simple rectangular box-type fuselage is used along with a V-tail and a single rear-mounted motor. The wings are removable but the tail is fixed in place. Image
Read 15 tweets
Sep 8
1. A number of post have incorrectly labelled this drone as a Ukrainian-made Palyanytsia. In fact this photo almost certainly shows a protype of a Dart 250 drone that is made by the British company Modini. Image
2. Here is a better view of the Dart 250. Note that Ukraine also has a low-cost fixed-wing drone called a “Dart” that is very different (don’t confuse them). Image
3. Modini uses very nice carts to transport its drones. Image
Read 10 tweets
Sep 5
1. A russian soldier surrenders to a #Ukrainian #drone by offering a trade. What is this thing that the russian is offering in exchange for his life? Is this a fair exchange? Image
2. Here is a better view of the case. It is a russian Thunderstorm electronic warfare system intended to combat drones. The controls are very simple. There are two power switches to enable the transmitters. There is also a switch & indicator for checking the battery voltage. Image
3. Removing the lid from the battery compartment reveals the underside of the controls. The battery-level board is not protected. This lid is held in place with hardware-store brackets and pop rivets. Image
Read 13 tweets
Aug 30
1. Ukraine announced that it had tested a long-range “rocket drone” called Palianytsia. Is this weapon, in practice, a cruise missile? This thread is a closer look at this (likely important) weapon. Image
2. Other than a few simple sketches & animations, Ukraine has released very few details about Palianytsia. The approach used here was to carefully study this public information with the aim of making a CAD drawing. From this drawing, various design aspects are considered. Image
3. How big is Palianytsia? If it uses an AI-PBS-350 turbojet engine, which is a joint project between PBS (Czech Republic) and Ivchenko-Progress (Ukraine), then the size is easily estimated. This engine weighs 51 kg with a maximum thrust of 3,400 N. Image
Read 15 tweets
Aug 20
1. Is it secret or not a secret? I have posted many threads detailing the technical aspects of #Ukrainian and russian #drones, including quadcopters and fixed-wing aircraft. Is any of this information secret? Image
2. There are always a few, possibly well-meaning, commenters who think my threads reveal secrets that will benefit the russians. Shown are a few select comments. Do they have a point or are they just technically uniformed? Let’s have a closer look at not-a-secret drones. Image
3. Amateurs started building radio-controlled (RC) aircraft more than 60 years ago. It was about 50 years ago that RC planes, although very expensive, became popular. This is relevant because all low-cost drones in Ukraine use hobby-grade components, which are not secret. Image
Read 22 tweets

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