Low Power Ice Protection Systems

Cox Low Power Ice Protection Systems are the latest technology in aircraft ice protection, offering elegant and practical solutions on a wide range of aircraft lifting surfaces, fairings, inlets and aircraft structures.


Electro-Mechanical Expulsion Deicing System (EMEDS)

EMEDS offers a reliable ice protection design alternative to pneumatic or electrical deicing boots on leading edges, which results in reduced airfoil drag and surface erosion characteristics - while also improving deicing performance and aircraft aesthetics.

EMEDS In-Flight Videos:
  

Low Power Ice Protection Systems
Low Power Ice Protection Systems

EMEDS is comprised of three line replaceable units: an electronic Deicing Control Unit (DCU) for timing and system control, an Energy storage Bank (ESB) to deliver high current electrical pulses, and a Leading Edge Assembly (LEA), consisting of actuators mounted in an airfoil-shaped structure with a metal or composite erosion shield.

Deicing Control Unit Energy Storage Bank Leading Edge Assemblies
Deicing Control Unit Energy Storage Bank Leading Edge Assemblies
Actuator Before "Firing" Actuator After "Firing"

A microsecond duration high current electrical pulse delivered to the actuators in carefully controlled timed sequences generates opposing electro-magnetic fields that cause the actuators to change shape rapidly. This change of the actuator shape is transmitted to the erosion shield of the LEA causing it to flex and vibrate at very high frequencies. This rapid motion results in acceleration-based debonding of accumulated ice on the erosion shield.

Actuator Before "Firing" Actuator After "Firing"

EMEDS Advantages — EMEDS offers many advantages over pneumatic boot ice protection systems. The following table gives comparisons of the base parameters that characterize low power ice protection systems.

Parameter / System

EMEDS

Pneumatic Boot

TKS

Electro-Thermal

BITE & Fault Reporting

Isolates to sub-component

High-level / Wing-only

High-level / Wing-only

Isolates to zone

Erosion Surface Material

Metal or Composite

Elastomeric

Titanium

Metal or Composite

Erosion Surface Life

Life of Aircraft

Months to approx. 3 years depending on service

Life of Aircraft

Life of Aircraft

Drag Increment

No increase

Measurable increase

Minimal increase

No increase

Deice Performance

As low as 0.050" - no upper limit

Typically greater than 0.25"

Anti-ice system. Must be activated prior to icing encounter to be effective.

Requires parting strip, creates runback ridges.

Weight

Baseline

Equivalent

System hardware is equivalent, plus additional 55 lbs (avg) for fluid

Less than or up to equivalent; dependent upon electrical generator.

Cost (USD)

Baseline

Equivalent

Equivalent + $100/flight (@ 8 gallons / 2.5 hrs)

Equivalent

Power (42' span)

300W

(up to) 775W (1 HP from engine for deflation / inflation + 28W electrical power for control)

42W (for pumps and control)

> 20,000W



Current Applications Include:

Raytheon Premier I Horizontal Stabilizer

Raytheon Premier I Horizontal Stabilizer

(FAA Part 23 Aircraft)

Raytheon Hawker Horizon Horizontal Stabilizer

Raytheon Hawker Horizon Horizontal Stabilizer

(FAA Part 25 Aircraft)

HondaJet HA-420 Horizontal Stabilizer

 HondaJet HA-420 Horizontal Stabilizer

(FAA Part 23 Aircraft)

Boeing P-8A Raked Wingtips, Vertical & Horizontal Stabilizers

Boeing P-8A Raked Wingtips, Vertical & Horizontal Stabilizers

(US Navy Aircraft)



Thermo-Mechanical Expulsion Deicing System (TMEDS)

The newest Low Power Ice Protection System offered by Cox, TMEDS builds upon the proven history of EMEDS and provides bleed-air / electro-thermal equivalent ice protection on leading edges at a fraction of the power.

TMEDS combines the best features of EMEDS and electro-thermal deicing:

Parameter

EMEDS

Electro-thermal

TMEDS

Minimum Thickness Required

0.060"

None

None

Residual (per cycle)

0.020"

None

None

Ridge Growth

No

Yes

No

Parting Strip

No

Yes

No


TMEDS Video (Cox LIRL):
  
TMEDS Side View
TMEDS

TMEDS is comprised of three line replaceable units similar to those of an EMEDS system, with the addition of heaters integral to the Leading Edge Assemblies and the associated controls within the Deicing Control Unit.



Current Applications Include:

Northrup Grumman Triton MQ-4C Wings & Stabilizers

Northrup Grumman Triton MQ-4C Wings & Stabilizers

(US Navy Unmanned Aircraft System)