AH-421

Airmaster Constant Speed Hub

The AH421 is a two blade propeller hub for use on small direct drive engines utilising the Rotax 4in pcd mount. This includes UL, Jabiru, and Corvair engines. It can be configured as clockwise/anti clockwise and tractor/pusher, with the addition of a feathering facility. It accepts industry standard 2.0in blade shanks.

The popularity of the UL, Jabiru and Corvair series of engines, combined with the wide range of blades available in the 2.0in shank, allows this hub to perform over a very wide range of applications.

Features include

Designed for UL, Jabiru and Corvairengines
High strength steel single piece hub shell and steel retention components
Extremely versatile Accepts any industry standard 2.0in shank blade
Highly configurable Clockwise / Anti clockwise / Tractor / Pusher
Fast response from high precision Maxon servo drive
Wide operating pitch range 10deg-89deg
Hard wearing pitch change mechanism
Easy maintenance with removable blade assemblies

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Specification
Features
Documentation

High Strength Hub Shell At the heart of each Airmaster propeller is a high quality hub shell. The single piece shell design has many advantages. It is lightweight and strong as it is able to distribute stresses evenly within the hub material. Each hub shell is fully machined inside and is finished in a two pot epoxy paint to give a long life with superior corrosion resistance. High strength single piece shell construction High gloss white paint finish (not anodised)
	Fast Pitch Change Motor Each Airmaster CS hub is actuated by an ultra precision servo drive, custom made for Airmaster by Maxon motors (Switzerland). These servo drives feature high torque densities allowing a compact design, precision metal gear heads for long life and laser welded stainess steel construction for corrosion resistance. There are simply no higher performing servo drives than these. Fast pitch change rates 3deg/s Laser welded stainless steel construction for corrosion resistance Hard wearing metal gears for long life Zero drift magnetic brake
Precision Pitch Change Mechanism Each blade is actuated from a precisely aligned central pitch change mechanism. The single assembly incorporates a custom ground acme thread form which is mated to a hard wearing bronze nut. These run in a pair of deep groove ball bearing races providing precise, low friction alignment. The Acetal pitch change block serves to transfer the actuation forces to the blade assemblies but is designed to break away in the event of a ground strike, thereby protecting the more expensive components. Precision ground spindle for low backlash Long life steel/bronze matched spindle/nut Sacrificial acetal block protects in case of ground strike Wide pitch adjustment range 10 to 89deg (Feather) / -20 to 45deg (Reverse)
	Easy Removable Blade Cartridge The installation and servicing of the propeller is very simple, due to the easily removable blade assemblies. Each assembly contains the bearings required to restrain and align the blade, the ferrule which is used to securely clamp the blade and the retention nut used to hold the assembly into the hub. An adjustable cam pin on each blade assembly allows for precise pitch adjustment and minimal pitch error. High strength steel components Nickel plated ferrules to protect from corrosion High quality SKF bearings Precise pitch compensation on each blade Quick and easy inspection for servicing Reduced volume for shipping
Simple Propeller Setup Airmaster propeller hubs are very versatile and get used in a wide variety of applications. To cope with this we have provided adjustments on each of the pitch stops associated with Fine, Coarse and Feather/Reverse limits. These are very easy to adjust to make sure each propeller is set up for your specific engine and environmental conditions. Quick adjustment of pitch stops Independent stops for FINE, COARSE and FEATHER/REVERSE limits

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Specifications

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Products specifications

Hub	AP421
Blade Make	Whirlwind
Blade Make	Sensenich
Engine	UL 260iS
Engine	Jabiru 2200
Engine	Jabiru 3300
Engine	Corvair
Mounting Flange	Rotax 4in (101.6mm) PCD

Products specifications

Hub	AP421
Blade Make	Whirlwind
Blade Make	Sensenich
Engine	UL 260iS
Engine	Jabiru 2200
Engine	Jabiru 3300
Engine	Corvair
Mounting Flange	Rotax 4in (101.6mm) PCD

Product tags

AP421 (4)

Power Capacity	Direct drive 4 cyl	100hp (75kW)
	Direct drive 6 cyl	120hp (90kW)
Maximum Speed	3300rpm
Weight	22lbs (10kg) including spinner but dependent on blades selection
Mounting Flange	Rotax 4in PCD with 13mm bush) 6 * 5/16” UNF bolts
Engine Type	UL260iS, Jabiru 3300, Corviar. Other engines may be suitable, please enquire.
Available Blade Types	Whirlwind, Sensenich
Available Configurations	Clockwise, Anti Clockwise / Tractor, Pusher *Can depend on blade choice
Pitch Range	10 deg to 89 deg
Pitch Stops	Fine	10 deg to 27 deg (user adjustable)
	Coarse	24deg to 40 deg (user adjustable)
	Feather	65 deg to 89 deg (user adjustable)
PC motor current	Nominal 1A while operating (2A max)
Pitch Rate	3 deg/sec