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1. Lesson 4
- we need to talk about wing profiles again (short repetition)
- it is necessary to talk about the fact that the air accelerates above the wing, but also below it near the trailing edge
- The speed around the profile is higher than the speed of the aircraft. this speed is different in different places
- The speed around the profile also depends on the angle of attack.
Supersonic flow
- Sound propagation speed, Calculation C=
- Local speed of sound

2. Shok Waves
Appearance of shock waves
- on the upper part of the wing profile
- On the leading edge of the wing.
- Transsonic flow
Development of buoyant force and torques
The evolution of drag
Structural designs required for supersonic flight.
Necessary transformations in the rules elements
Lesson 5-6
propeller, rotary wing
Description of the propeller, presentation of basic geometric characteristics.
It must be said that the propeller profile is the same as the wing profile.
Although it is characterized by Cl, Cd, as in the wing profile.
Attention should be drawn to the fact that the speed on the propeller must not reach the local speed of sound.
speeds on the propeller. (speed is higher on the outer circumference)
It should be said that this is why the profile of the propeller is twisted in order to ensure that the angle of attack of the air is the same
It should be said that as the speed of the aircraft increases, the angle of attack on the propeller profile changes.
This limits the maximum speed of a propeller aircraft.
The angle of the propeller can be adjusted during flight. This allows for higher speeds.
Propeller efficiency

3. Helikopters
A rotary vane works like a propeller
It is large in size as it has to lift a large load
Large diameter, low rotation speed, low flight speed are characteristic.
Precession, tail propeller, double rotary wing.
Structural designs
Autorotation
Airplanes taking off from a place
Gyroplane
Agricultural aircraft
firefighting aircraft Agricultural aircraft
firefighting aircraft
It is worth seeing how DHC fills itself with water
https://www.google.com/search?client=firefox-b-d&q=t%C5%B1zolt%C3%B3+rep%C3%BCl%C5%91g%C3%A9p#fpstate=ive&vld=cid:7e479d81,vid:YImMD7EGMt8,st:0