GB2334925A - Rotating aircraft wheels prior to landing - Google Patents

Abstract

An aircraft wheel is rotated prior to landing by means of airflow driving an impeller 2, on the rim 1, of the wheel. The speed of the wheel is detected and controlled by a computer which may command a secondary braking system.

Description

THE SYSTEM OF SOFT LANDING.

This invention relates two an Aircraft & Spacecraft industry.

At the present time, it seems to me, that it is possible to improve the process of landing aircrafts & spacecrafts and do it more safely, softly and to increase term of service of the expensive aircrafts tyres.

Why are the wheels of aircrafts, especially the aircrafts which are heavy, for example Boeing 747, B - 52 so on are burning, smoking when they just touch the landing field? Why does the aircraft jump several times before it starts to roll on the landing ground ? In theory it is because there is an impactof two objects taking place during the landing, as one object is moving and the other object is motionless.

A different speed between them at first moment of touch is equal of speed of landing 120 - 150 km. p. h.

"Motionless object" it is the wheels of landing aircraft.

They are unable to start rotating in a flash (instantaneously) , same as a heavy rotating wheel can not stop in the twinking of an eye.

Therefore we have a strike. Therefore we have jumps of aircraft, burning of tyres, smoke before aircraft start to roll.

The harts of passangers have stopped beating..

How to prevent these unwanted phenomenons, and to make landing more safe, more reliable, more softly ? How to increase term of service of the expensive aircrafts tyres? An answer is very simple -- easy. How practically? The wheels of landing aircrafts MUST be rotating! ! ! ! At what speed of rotating must the wheels be ? It is depends on the speed of the landing aircraft and the diameter of its wheels. The speed of the rotating wheel we can calculate by a simple formula: S N= 3.l4xD where is: S - speed of aircraft metres per minute D - diameter of wheel metres N - numbers of revs of wheel peri minute Let us suppose; 1. Speed of aircraft equal 150 kmp.hour, or 150km.p.hour 60min = 2500 metres per minute.

2. Diameter of a wheel = 1 meter.

2500 N =3.14?cD; N= 796.18 revs p. minute So, for an aircraft with landind speed of 150km.p.hour,the speed of rotating wheels must be: 796.18 revs per minute.

How to rotate the wheels of the landing aircraft ? Easy, by oncoming air. To do so a outer side or inner side, if possible, of each rims must contain a impeller. (wind turbine).

It will be work like a windmill.

How to keep up nessesary speed of rotating wheels ? Each wheel, or few wheels having common axle must contains a separate detector of its speed and this signal going to a little computer. It could be a simple comparator which compares speed of aircraft and speed of rotating wheel, and provide nessesary comand to secondary braking system which must work in impuls duty.

A specific embodiment of the invention will now be descripted by way of example with reference to the accompanying drawing in which : Figure 1 illustrates a wheel of aircraft from side point of view.

Figure 2 shows the same wheel in position of conditional rip (section) Figure 3 shows general system of control for speed of rotation the aircrafts wheels.

Refering to the drawing the wheel comprising a tyre 3, and a special type of rim 1 with an impeller 2. But it could be one unit.

Claims (3)

1. The system of soft landing based upon an idea of rotating the aircraft wheels during landing with nessesary speed by virtue of incoming air and control of rotation for each wheel by means of computer.

2. The system of soft landing comprising a special type of rim with an impeller which will rotate the wheel by incoming air.

3. The system of soft landing comprising a special type of computer system to control the speed of rotation of each wheel.