THE BEARING
HELICOPTER ROTOR WITH INCREASED EFFICIENCY
Existing propeller systems
creating mainly lifting and additional driving forces, have low efficiency. So,
for example, the power expenditures at the best modern helicopters make about 1
kg-f (736 W) on 7 kg-f of lift (0.105 kW on 1 kg-f of lift). So the helicopter
with take-off weight 8000 kg-f should have power of the power plant:
8000 * 0.105 = 841.12 kW (1142.8 h.p.)
The power plant with such
power with efficiency about 0.3 will spend such amount of fuel:
G = N * 75 / (Qkerosine * 427 * hplant * hscrew) =
1142.8 * 75 / (11000 * 427 * 0.3 * 0.9) =
= 0.068 kg/sec = 243.3 kg/hour
Propellant consumption more
than 240 kg/hour determines a low economic efficiency and limits broad
distribution of helicopters as means of transport.
The low profitability of
helicopters is determined by application of the screw as the load-lifting gear,
while the screw is functional is intended for fulfillment of a function of the
propeller. When the screw, as the propeller, transmits to the means of
transport speed of movement Vmov.>> 0, it has rather high profitability. When the main power of
the screw is used as the load-retaining gear at Vclimb » 0, its profitability is extremely
low.
We have developed new
alternative propeller system allowing to increase an economic efficiency at the
expense of reduction of power expenditures, on 1 kg-f of weight of a flight
vehicle. The power expenditures make not 105.14 W, but about 50-60 W on 1 kg-f
of weight of a flight vehicle. It will allow to reduce propellant consumption
from 243.3 kg/hour up to 115.6–138.8 kg/hour. The economy will be essential
taking into account growing prices for fuel. Such effect is reached at the
expense of the alternative approach to the solution of a function of the screw
not as the propeller, but as the load-lifting system.
For heavy flight vehicles
with take-off weight 100 tons and more we have developed more difficult, but
more effective load-lifting gear, the screwless application of which opens a
new class of flight vehicles. They can have power-expenditures 7.36 W on 1 kg-f
of flight weight, that it is 5 times better than parameter of modern airplanes.
The airplane supplied with such load-lifting gear, opens era of new airplanes
of the 21 century.