AH-521/3H

Airmaster Constant Speed Hub

The AH521/3H is a two blade propeller hub for use on engines utilising the SAE-1 mount. This includes UL, Continental and Lycoming 0 series of engines. It can be configured as clockwise and tractor, with the addition of a feathering facility. It accepts industry standard 2.375in blade shanks.

The popularity of the UL series of engines, combined with the wide range of blades available in the 2.375in shank, allows this hub to perform over a very wide range of applications.

Features include

Designed for ULPower engines
High strength steel single piece hub shell and steel retention components
Extremely versatile accepts any industry standard 2.375in 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

Blade Make	Whirlwind
Maximum Speed	3000rpm
Hub	AP523
Engine	UL 350iS
Engine	UL 390iS
Engine	Continental O200
Engine	Lycoming O235
Mounting Flange	SAE-1

Products specifications

Blade Make	Whirlwind
Maximum Speed	3000rpm
Hub	AP523
Engine	UL 350iS
Engine	UL 390iS
Engine	Continental O200
Engine	Lycoming O235
Mounting Flange	SAE-1

Product tags

AP521H (1)
,
AP523H (1)

Power Capacity	Direct drive 4cyl	130hp (97.5kW)
	Direct drive 6cyl	160hp (120kW)
Maximum Speed	3000rpm
Weight	25.5lbs (11.5kg) including spinner but dependent on blades selection
Mounting Flange	Rotax, SAE 1
Engine Type	UL350iS, UL390iS, Other engines may be suitable, please enquire.
Available Blade Types	Whirlwind / Sensenich
Available Configurations	Clockwise/ AntiClockwise, 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	24 deg 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

AH-521/3H

AH-521/3H

Airmaster Constant Speed Hub

Features include

AP523CTF-SNR67JE

Airmaster Propeller System

AP523CTF-SNR67JE

AP523CTF-SNR67JE

Airmaster Propeller System

AP523CTF-SNR67JE

AP523CTF-SNR67JE

Airmaster Propeller System

AP523CTF-SNR67JE