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Retraction Systems Descriptions and Specifications: NL1-12E and NL1-12EHP PDF Print E-mail

The standard retraction system consists of the main actuator assembly and all the parts listed as a part of NL1 Order No. on the price page. The functionality is described and illustrated on this page.

Basic Actuator Disassembled

NL1-12 & NL1-24 Retraction System

The standard retraction system is designed functionally to give the pilot complete manual control of the nose gear on the ground or in the air. It also gives a complete indication of the status of the gear at all times.

The standard manual control panel (1.65” x 2.25”) comes completely wired with a high current micro toggle switch and two dual color LED (Light Emitting diode) indicators. The circuit components are chosen to allow the lightest most functional system.

The indicators annunciate four retraction system conditions:

  • Gear up (top indicator amber),
  • Gear running down (top indicator green)
  • Gear down (lower indicator green)
  • Gear running up (lower indicator red).

The switch also has a center off position that is used only for ground operation. When the switch is in the center “off” position all the indicators will not be illuminated. The switch panel with the gear retraction wiring diagram provided with the unit recommends that a main ten ampere circuit breaker (15 amps for the EHP unit) be wired ahead of the aircraft master switch. This allows the pilot to raise and lower the airplane at will on the ground for convenient ground handling and entry and exit from the canard type aircraft without turning on the aircraft master switch. The  control panel switch positions and indicator lights are illustrated below. Warning: the gear switch must be in the “Down” position for landing and taxi operations.

DOWN

RUNNING UP

UP

RUNNING DOWN

Also included on the control panel is a second switch labeled “Auto Defeat”. This is switch is only used when the AEX-12 optional Automatic Extension System is purchased. See the AEX-12 page for a detailed description, specification and operation.

All of the NL1 Actuators include a “overload clutch” which protects the actuator reduction gears from damage due to overload. All NL1 actuators also contain a passive back drive clutch that keeps the load from driving the motor when power is removed. The NL1-12EHP uses an electrically active back drive clutch that extends the power off load handling specification up to the limits of the internal overload clutch limits. Unlike the passive back drive clutch the active clutch is deenergized during power application to the nose lift. This relieves the nose lift of the added friction of a passive back drive clutch and allows the nose lift to operate 20% faster. While the NL1-12EHP is designed primarily for aircraft with two forward seats it can be installed in any of the EZ type aircraft to obtain faster retract and extend performance.

All the NL1 actuators include a backup extension function to allow extension of the nose gear in case of power failure or other electrical failures. The NL1-12 includes a universal joint and extension shaft that allows the pilot to extend the gear manually. The NL1-12E  and the NL1_EHP use a small sealed backup battery and associated wiring that allows the pilot to extend the gear by operating a panel mounted “Emerg. Extend” switch. Any of the NL1 actuators can be installed as a retrofit in fully completed aircraft. However, because the manual extension shaft may interfere with existing equipment installed in the instrument panel and ease of installation the NL1-12E or NL1-12EHP are usually the best choice. For new construction any of the NL1 actuators can be installed with equal ease.

NL1-12, NL1-24 and NL1-12E Specifications:

Recommended applications: VariEze, Long-EZ, Cozy and Cozy MKIV  aircraft with less than 400 lbs front seat weight or 230 lbs nose wheel weight. (for weights above this see NL1-12EHP specifications).

NL1-12E

Unit weight uninstalled: NL1-12 or NL1-24: 10 lbs 10 oz includes mounting brackets and manual ext. shaft, but not kit parts that replace original parts.

Unit weight uninstalled: NL1-12E:  11 lbs 6oz includes mounting brackets and backup battery, but not kit parts that replace original parts.

Installed weight: 5lbs (weight added after installation replacing manual gear retraction mechanism).

Retraction actuator travel: 7.3” +/- .02

NL1-12 & NL1-24 dimensions when retracted: 14.2” long, 6.5” high, and 3.2” wide.

NL1-12E dimensions when retracted: 13.5” long, 6.5” high, and 3.2” wide.

Power requirements NL1-12 and NL1-12E: 12-14 volts, 5.5-6amps no load. 10 amps average. 12 amps at full shock spring deflection, 16 amps at overload clutch actuation.

Power requirements NL1-24: 24-28 volts, 2.8-3amps no load. 5 amps average. 6 amps at full shock spring deflection, 8 amps at overload clutch actuation.

Recommended circuit protection NL1-12 or NL1-12E (NL1-24): 10 (5) amp thermal circuit breaker with pilot access for load protection. 15 (8) amp fuse or circuit breaker for wire protection.

Extend retract time when airborne (min. load):  21 seconds.

Max load when powered by 12 volts or greater) : 2700 lbs at nose lift, 450lbs at nose wheel. Limited by internal overload clutch.(This load is greater than the load limits of the nose wheel strut and airframe components especially under dynamic flight operations.)

Overload clutch load limit: 2700 lbs at nose lift actuator.

Emergency manual shaft torque to extend gear (NL1-12 only): 50-65 inch lbs starting torque. Shaft exits instrument panel at the top center.

Max load with power off in fully extended position after motion is stopped: 1700 lbs at the nose lift, 260 lbs at the nose wheel (fully extended) or 400lbs front seat weight. This is limited by internal back drive clutch.

Internal shock absorber specifications;

Load at full spring deflection: 2000 lbs at nose lift. 333 lbs at nose wheel.

Preload : 700 lbs, 117 lbs at nose wheel gear fully extended. ( This is the load where the nose gear begins to compresses the shock absorber).

Dynamic shock control: (shock spring kick back control): Rubber return pad and grease filled chamber. This prevents damage to airframe mountings and other associated parts from hard landings and rough surface operations.

NL1-12EHP Specifications:

Recommended applications: VariEze, Long-EZ, Cozy, Cozy MKIV and other canard aircraft.

NL1-12EHP

Unit weight uninstalled: 11 lbs 8oz includes mounting brackets and backup battery, but not kit parts that replace original parts.

Installed weight: 5lbs 8oz (weight added after installation replacing manual gear retraction mechanism).

Retraction actuator travel: 7.3” +/- .02

NL1-12EHP dimensions when retracted: 16” long, 6.5” high, and 3.2” wide.

Power requirements: 12-14 volts, 5.5amps no load. 13.4 amps average. 15.4 amps at full shock spring deflection, 19 amps at overload clutch actuation less than .5 second.

Recommended circuit protection: 15 amp thermal circuit breaker with pilot access for load protection.

Extend or retract time when airborne (min. load):  17 seconds.

Max load when powered by 12 volts or greater) : 2700 lbs at nose lift, 450lbs at nose wheel. Limited by internal overload clutch. Warning: This load is greater than the load limits of the nose wheel strut and airframe components especially under dynamic flight operations.

Overload clutch load limit: 2700 lbs at nose lift actuator.

Max load with power off in fully extended position after motion is stopped: 2700 lbs at the nose lift, 450 lbs at the nose wheel (fully extended). Warning: This load is greater than the load limits of the nose wheel strut and airframe components especially under dynamic flight operations.

Internal shock absorber specifications:

Load at full spring deflection: 2000 lbs at nose lift. 333 lbs at nose wheel.

Preload: 700 lbs, 117 lbs at nose wheel gear fully extended. (This is the load where the nose gear begins to compresses the shock absorber spring).

Dynamic shock control: (shock spring kick back control): Rubber return pad and grease filled chamber. This prevents damage to airframe mountings and other associated parts from hard landings and rough surface operations.

Last Updated on Friday, 22 November 2013 16:51
 
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