A helicopter cannot function on Mars, because there is only 1% as much atmosphere on Mars as on Earth. (0.0063 times Earth's atmospheric pressure). One percent as much atmosphere means approximately one percent as much force on helicopter blades.

Helicopters are too marginal on Earth to assume they could function with 1% as much atmosphere. The requirement would superficially be 100 times as much blade speed and surface area combined to produce the same lifting force.

Here's an example: The helicopter was said to weighed 4 pounds, which means 1.52 pounds on Mars. The gravity of Mars is 0.38 times that of Earth. If the blades were 1 pound on Earth, they would be 0.38 pounds on Mars.

The blade weight wasn't given; but the diameter was said to be four feet. It's hard to imagine four foot blades weighing only one pound.

The atmospheric pressure on Mars is 0.0063 times that of Earth. That is 159 times less. So the combination of blade speed and surface area would superficially need to be 159 times as much on Mars as on Earth. The speed and surface area of the blades would be approximately interchangeable quantities. The differences can be rounded off to equal for this.

The stated revolutions per minute for the blades is 2,500. That's 42 revolutions per second. If that were 159 times greater than on Earth, the Earth helicopter would have a blade speed of 16 revolutions pre minute, which is 3.74 seconds per revolution, which is functionally stopped.

A more realistic guess would be a minimum of 5 revolutions per second on earth, which is 300 revolutions per minute. Multiplying times 159 for Mars would be 47,700 revolutions per minute, not the stated 2,500.

Viscosity is also relevant, because it determines how much force the air can produce in pushing upward on the blades instead of the air moving sideways to get out of the way. Lower air pressure produces lower viscosity. A suitable guess would be one third as much viscosity at 1% as much pressure. So the demand for blade speed and surface area goes up to 3 times more due to viscosity reduction. Three times 47,700 is 430,000 rpms.

All of the numbers and concepts are unreal. A blade diameter of four feet is going to weigh more than one pound. A high speed motor, batteries, support material and solar panel would weigh more than 3 pounds.

The fakes are stating conditions by about a factor three more than is physically possible. The helicopter would need to weigh about 10-15 pounds, not 4 pounds. RPMs of 2,500 would be about three times more than physically possible for four foot blades. The centrifugal force would pull the metals apart. Extreme demands would require a heavy motor and large batteries, not the toys that become invisible.

There is a weight to performance line of impossibilities involved. To get high performance requires more weight, which requires higher performance and more weight. There is no way to get 159 times more performance out of a helicopter.

Not to mention that physicists have no way to get a spacecraft to Mars. (Fakery Of Space Projects)