Over the years of full-scale war, military FPV drones have changed noticeably. While relatively small copters were initially the most widespread, Ukrainian manufacturers today offer a much wider selection of models. They differ not only in dimensions but also in payload capacity, flight range, and purpose.

At the same time, an increase in size does not always mean better characteristics. Large and compact FPVs each have their own advantages and limitations, so manufacturers continue to develop both directions.

We break down how the size of a military FPV drone affects its performance, why increasingly larger models are appearing, and for which tasks compact units remain necessary.

What Sizes of Military FPV Drones Exist

FPV (First Person View) is a technology in which an operator pilots a drone by relying on video from its onboard camera. The image is transmitted in real time to special goggles or a monitor, allowing the pilot to control the flight trajectory, maneuver between obstacles, and guide the drone onto a target.

Unlike many commercial quadcopters that use automatic stabilization, satellite navigation, and can fly along a preset route, military strike FPVs typically require constant manual control. At the same time, FPV is not a separate type of drone but a method of piloting. This technology is used in drones of various sizes and designs, including strike and reconnaissance variants.

Military personnel often refer to FPV drones as “sevens,” “tens,” or “fifteens.” This refers to the diameter of the propellers, measured in inches.

One inch equals 2.54 centimeters. Accordingly, a five-inch FPV has propellers with a diameter of 12.7 cm, a ten-inch FPV has 25.4 cm, and a fifteen-inch FPV has 38.1 cm.

This is not the length or width of the aircraft itself. Its actual dimensions are larger, since the propellers are located at the ends of the frame arms. Another metric is the wheelbase — the distance between the centers of opposite motors measured diagonally.

Today, Ukrainian manufacturers offer a wide selection of platforms — from five-inch models to large ones with propellers exceeding 40 cm in diameter.

FPV Size	Propeller Diameter	Examples of Ukrainian Drones
5 inches	12.7 cm	F-Drones F5
7–8 inches	17.8–20.3 cm	F-Drones F7, TAF “Kolibri”, Vyriy 8
10–11 inches	25.4–27.9 cm	Vyriy 10, F-Drones F10 and F11
13 inches	33 cm	TAF “Kolibri”, “General Chereshnya OPTIX”
15 inches	38.1 cm	Vyriy 15, TAF “Kolibri”
17–18 inches	43.2–45.7 cm	“Queen Hornet”, Ptashka Drones, F-Drones F18

These are only some of the models available on the market. Military FPVs are also produced by SkyFall, Air3F, 3DTech, and other companies.

How Size Affects FPV Drone Characteristics

Payload Capacity

Propellers generate thrust that allows a copter to ascend and remain airborne. As their diameter increases, so does the area of airflow they cover.

For example, a ten-inch propeller has twice the diameter of a five-inch one, but the area of the circle it sweeps during rotation is four times larger.

Because of this, large propellers under appropriate conditions can generate thrust more efficiently. In the physics of flight, this is related to the concept of disk loading — the ratio of the aircraft’s weight to the total area of its propellers.

However, large propellers require correspondingly larger motors and a heavier structure. Part of the additional thrust is consumed by the increased mass of the drone itself. Therefore, payload capacity is determined by the entire power unit, not just propeller diameter.

Range and Flight Endurance

Larger FPVs can accommodate higher-capacity batteries. This increases the energy reserve but also adds weight.

The heavier the battery, the more energy is needed to move it. So doubling the battery capacity does not mean doubling the flight endurance.

Range is also affected by payload, speed, weather conditions, and motor efficiency. Thus, a ten-inch FPV under certain conditions may fly farther than a thirteen-inch one.

Maneuverability and Construction

Compact FPVs are generally lighter and have a lower moment of inertia, so they can change position in the air more quickly. In larger aircraft, the motors are located farther from the center of the structure, and the overall mass is higher.

At the same time, maneuverability also depends on motor power, the thrust-to-weight ratio, and control settings.

An increase in dimensions also raises the structural strength requirements for the frame. Carbon fiber is predominantly used for strike FPVs, but heavy platforms may feature reinforced structures. For example, the 17-inch “Queen Hornet” has an aluminum frame.

Why Military FPV Drones Are Getting Larger

At the beginning of the full-scale invasion, Ukrainian manufacturers largely relied on available components from civilian copters. Seven-inch FPVs were relatively straightforward to produce, but over time the military’s requirements changed.

One of the reasons was the need to cover greater distances. In an interview with DOU, F-Drones CEO Stanislav Khutor recounted that the company began serial production with the seven-inch F7, but the ten-inch F10 subsequently became the main product.

According to him, as the grey zone expands, drones have to fly farther. Accordingly, requirements for energy reserves and the power unit increase.

Another factor is the need to carry heavier warheads. For example, the manufacturer states a payload capacity of up to 4 kg for the Vyriy 10, while for the Vyriy 15 it is up to 8 kg. The seventeen-inch “Queen Hornet” can lift up to nine kilograms.

An additional impetus for larger drones came from the development of FPVs with fiber-optic communication. For example, TAF Industries states a payload capacity of up to 4 kg for the radio-controlled “Kolibri 10 Advance,” while for the fiber-optic “Kolibri 10-O” it is up to 1–1.5 kg depending on the configuration. In other words, payload capacity differs for similarly sized drones due to the equipment used.

Large fiber-optic FPVs are also produced by other companies. In particular, “General Chereshnya” has the OPTIX line with models at 10, 13, and 15 inches, while Ptashka Drones created the seventeen-inch “Ptashka 17-O-50 km.”

Why Manufacturers Are Not Abandoning Compact FPV Drones

Large aircraft can carry more payload but take up more space during transportation. In addition to the drones themselves, military personnel need to transport batteries, spare parts, and other equipment.

For units that move on foot or use small vehicles, dimensions can be especially important. Therefore, the advantage may lie with smaller drones.

According to F-Drones CEO Stanislav Khutor, the five-inch F5 model was developed for assault units, specifically for operations in tree lines and built-up areas. In its radio-controlled version it can carry up to one kilogram of payload over a distance of up to seven kilometers. A fiber-optic modification also exists.

Several F5s can be carried in a single backpack. In addition, the company has developed a platform for transporting them on a ground robotic system capable of carrying nine such drones.

That is why F-Drones simultaneously develops the large F11, F15, and F18 models alongside the compact F5. In one case the priority is higher payload capacity; in the other, it is small dimensions.

How FPV Drones of the Same Size Can Differ

Propeller diameter allows one to determine the approximate class of an FPV, but not its capabilities. Manufacturers use different motors, batteries, communication systems, and additional equipment.

For example, most strike FPVs have four motors, but F-Drones also produces the six-motor F10 HEXA and F13 HEXA.

The electronics also differ. Drones can be equipped with daylight cameras, thermal imagers, digital video systems, or additional computing modules.

It is also worth distinguishing between single-use strike FPVs and reusable copters. For example, Frontline Robotics created the twelve-inch “Linza” and “Zoom” — a bomber and a reconnaissance drone, respectively.

According to the manufacturer’s data, “Linza” can carry up to 4 kg of payload and remain airborne for up to 60 minutes.

Such aircraft are designed to return after completing a mission, so component service life, reliability, and repairability are especially important for them. Accordingly, comparing them with ordinary single-use FPVs solely by propeller diameter is not appropriate.

Does the Cost of an FPV Drone Depend on Its Size

Larger drones typically require heavier frames, motors, and propellers, which can increase the cost of production. However, electronics, cameras, and communication systems constitute a significant portion of the price.

In a DOU article on drone production costs, TAF Industries CEO Volodymyr Zinovskyi compared a standard ten-inch FPV with a daylight camera at approximately 18,800 hryvnias and a thermal imaging version at 38,800 hryvnias.

At Vyriy, the eight-inch Vyriy 8 cost 13,500 hryvnias, while the Johnny 8 with a thermal imaging camera cost 41,500 hryvnias.

Thus, a compact FPV with specialized equipment can be significantly more expensive than a larger model in a simpler configuration.

A similar situation applies to range and payload capacity. For example, TAF Industries states for the ten-inch “Kolibri 10 Advance” a payload of up to 4 kg and a maximum range of up to 30 km. For the thirteen-inch “Kolibri 13 Advance,” these figures are up to 5 kg and up to 15 km, respectively.