What other methods are used for anti-icing besides bleed air.?

Question

What other methods are used for anti-icing besides bleed air.?

Answer 1

Some small aircraft use inflatable boots on th eleading edges of the wings. When the boot inflates the ice cracks off.

Answer 2

Mostly on small aircraft wings, there are rubber boots covering called de-icer boots placed on wing leading edge where electrical heating is used just to crack the ice formation and be blown away.

Modern jet prop planes like the Dash 8 Q300-Q400, also uses some kind of ice-repellant fluid sprayed on the wings.  

hope this help in some way.

Answer 3

For anti ice there are electricly heated pads along the wing leading edge and prop leading edge.  There are de-icer boots, i don't know if you meant anti ice specifically but there is de-ice and anti ice.  The boots are for deicing, that is, it breaks off the ice already formed on the wing by inflating, and they can work with a pnumatic vacumm pump on some planes.  Anti ice is preventative.

Answer 4

electrical heated  rubber boots.

electrical heated coils and panels.

Answer 5

heater pads run a/c voltage

Answer 6

Under certain atmospheric conditions, ice can build rapidly on airfoils and air inlets.

The two types of ice encountered during flight are rime and glaze. Rime ice forms a rough surface on the aircraft leading edges. It is rough because the temperature of the air is very low and freezes the water before it has time to spread. Glaze ice forms a smooth thick coating over the leading edges of the aircraft. When the temperature is just slightly below freezing the water has more time to flow before it freezes.

Ice may be expected to form whenever there is visible moisture in the air and the temperature is near or below freezing. An exception is carburetor icing which can occur during warm weather with no visible moisture present. If ice is allowed to accumulate on the wings and empennage leading edges, it destroys the lift characteristics of the airfoil. Ice or rain accumulations on the windshield interfere with vision.

Several means to prevent or control ice formation are used in aircraft today:

(1) Heating surfaces usìng hot air,

(2) Heating by electrical elements,

(3) Breaking up ice formations, usually by inflatable boots, and

(4) Alcohol spray. A surface may be anti-iced either by keeping it dry by heating to a temperature that evaporates water upon impingement; or by heating the surface just enough to prevent freezing, maintaining it running wet; or the surface may be deiced by allowing ice to form and then removing it.

Pneumatic deicing systems use rubber deicers, called boots or shoes, attached to the leading edge of the wing and stabilizers. The deicers are composed of a series of inflatable tubes. During operation, the tubes are inflated with pressurized air, and deflated in an alternating cycle. This inflation and deflation causes the ice to crack and break off. The ice is then carried away by the airstream.

Deicer tubes are inflated by an engine-driven air pump (vacuum pump), or by air bled from gas turbine engine compressors. The inflation sequence is controlled by either a centrally located distributor valve or by solenoid operated valves located adjacent to the deicer air inlets.

Deicers are installed in sections along the wing with the different sections operating alternately and symmetrically about the fuselage. This is done so that any disturbance to airflow caused by an inflated tube will be kept to a minimum by inflating only short sections on each wing at a time.

Answer 7

do you mean pre-heat for the carb????   works, simple, doesn't fail often, unless pilot error, lightweight, low tech...............

Answer 8

Anti freeze/alcohol, expanding rubber skin strips - like on some ANRs. Hot exhaust tubes at/under  leading edge of wing - Fokker turbo props(?)