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LL PSV helicopter (Mi-24LL "PSV"), Flying laboratory of future high-speed helicopter.
Experimental helicopter based on the Mi-24K - prospective high speed helicopter. Single-seat streamlined cockpit, unarmed, fitted with experimental main rotors for research into high-speed flight.
The first test flight of the helicopter Mi-PSV held on December 29, 2015.

Helicopter LL PSV: Flying laboratory of future high-speed helicopter.
The innovation introduced in helicopter to the impeller which has blades with curved finish, new generation entirely made of synthetic materials developed by Mil.

Helicopter LL PSV: It has no wings.
Using a new generation of blades allow: helicopter Mi-28NM
- of increasing the speed by 10%
- of increase the cruise speed by 13%
Using a new generation of blades allow: helicopter Mi-35M
- of increasing the speed by 13%
- of increase the cruise speed by 30%

The PSV is a modified helicopter based on the Mi-24K to achieve high speeds in helicopter by testing new rotor blades.
Technical specifications
| DESIGNER | OKB Mil |
| COUNTRY | Russia |
| TYPE |
Flying laboratory
|
| CREW | 1 |
| POWER-PLANT | Two VK-2500-1 turboshaft engines |
| Power, h.p. | 2x2.400 |
| DIMENSIONS | |
| Length, m | - |
| Main rotor diameter, m | - |
| Tail rotor diameter, m | 3,91 |
| Height, m | - |
| Wing span, m | 6,66 |
| Wing area, m2 | - |
| WEIGHT | |
| Maximum take-off, kg | 11.500 |
| Normal take-off, kg | - |
| Empty, kg | - |
| Internal fuel, l | - |
| Weight of transported fuel with external tanks, l | - |
| Warload, kg | - |
| Payload, kg | 4-5 passengers (maximum up to 8 passengers). |
| PERFORMANCE | |
| Maximum speed, km/h | up to 400 |
| Cruising speed, km/h | 340-360 |
| Range, km | 420 |
| Combat range, km | - |
| Service ceiling, m | 6.200 |
| Static ceiling, m | 3.800 |
| Rate of climb, m/s | 18,3 |
| Maximum overload, g | - |
| ARMAMENT | Doesn't have (defensive). |