Without a method of converting the power produced by the engine into useful thrust an aircraft would just be sitting still and creating a lot of noise and not get anywhere. In the past, all kinds of different propeller designs were tried: sometimes flat wooden blades, from one bladed counterweighted to multiple blade models rotating at various speeds.
Until it was realized that a propeller is just like a wing creating lift. But instead of carrying the aircraft it displaces a large volume of air backwards. Albeit slowly, compared to a pure JET engine, which displaces a small volume of air at very high speeds.
Variable pitch propellers have a distinct advantage compared to fixed pitch models. This translates into a more fuel efficient, higher performing aircraft with much improved rate of climb and shorter take-offs for those tight places!
Airmaster Propellers, Ltd from New Zealand is a manufacturer of high quality electrical constant speed propellers with various options like feather, manual pitch control with hold and factory presettable RPMs for take off, climb and cruise tailored to your aircraft and engine combination.
Airmaster manufactures a number of high quality propeller systems: AP530/20, AP430/20 and the AP332. They are all controlled by the AC200(F/R) constant speed electronic governor and can be installed in tractor and pusher configurations on a wide range of aircraft.
AP533 Hub (High power, 3 port, SAE-1 mount), 68" Whirlwind blades A profile (speed), suitable for UL520iS engines. This propeller is designed specifically for high power direct drive engines. It is tailored for high speed applications like the RV-8 etc.
Power capacity 200 hp (150 kW), Maximum speed 3000 rpm, with an installed weight AP533-WWR68A 34 lb (15.5 kg), mounting flange AP533: SAE-1, Engine type: UL520 - 520iS series.
AP521 Hub (High power, 2 port, 4in PCD mount), 68" Whirlwind blades A profile (speed), suitable for UL350iS(a) engines. This propeller is designed specifically for high power direct drive engines. It is tailored for cross country and high speed applications like the TAF3 Flamingo.
Power capacity UL350iS 130 hp (97 kW), maximum speed 3000 rpm, installed weight AP521-WWR68A 25.5 lb (11.5 kg), mounting flange AP521: 4" PCD, AP523: SAE-1.
The AP430 hub has provisions for the following blade types Sensenich, Kievprop, Aerolux and Warpdrive. With a range of spacers to fit your cowling and a selection of spinners to match the aircraft and it is controlled by the AC200 control system. The power capacity for a geared Engine 120 hp (89.5 kW) with a maximum speed of 2800 RPM.
Installed weight 25.3l bs (11.5 kg) including spinner but dependent on blade selection. Mounting flange RP502 (Rotax 4" [101.6 mm] PCD with 13 mm bush) 5/16" UNF bolts, Engine type: Rotax 912, 912S, 914 or similar.
The two bladed AP420 hub houses Sensenich blades. It is available with a range of spacers and spinners to match cowling and aircraft. It is also controlled by the AC200 control system. Maximum power capacity for geared engines is 120 hp (89.5 kW), six cylinder direct drive 120 hp (89.5 kW) and four cylinder direct drive up to 90 hp (67 kW) with a maximum speed of 3300 rpm.
The installed weight is 19.6 lbs (9 kg) including spinner but dependent on blade selection. Mounting Flange fits RP502 (Rotax 4" [101.6 mm] PCD with 13 mm bush) 5/16" UNF bolts. Used on engine types Rotax 912, 912S, 914 or Jabiru 3300, 2200. This hub would be perfect for Tecnam type aircraft.
The three bladed AP420 hub houses Warpdrive or Bolly blades. Also with a range of spacers to fit cowling and a selection of spinners to match the aircraft and it is controlled by the AC200 control system. Its power capacity is up to 115 hp (89.5 kW) on gear reduced engines with a maximum speed of 2500 rpm. Power Capacity up to 115 hp (89.5 kW) on gear reduced engines with a maximum speed of 2500 rpm.
Installed weight 26 lbs (11.8 kg) including spinner but dependent on blade selection. Mounting flange for Rotax 4" [101.6 mm] PCD with 13 mm bush) 5/16" UNF bolts, Engine Type Rotax 912, 912S, 914 or similar.
The microcontrolled AC200 Constant Speed electronic governor contains the following functions: It has a simple three step speed selection with a rotary knob, hold functions with full manual override, a full feather control and a beta range for the AC200R controller.
The speed control settings are: Take Off, Climb and Cruise which are factory preset but may be customized with a serial cable and PC or laptop. Hold: may be set by pilot in flight with manual switch and a feather switch with automatic feather and unfeather cycles. The visual indicators are Fine / Coarse / Feather stops / Coarse pitch stop, bypass Fine / Coarse / Feather, running PC motor overcurrent and speed signal loss. More details to be found in the AC200 operator manual. Those of you wanting to re-program or adjust the preset factory engine RPMs, see the SI-006 AC200 User Software Instructions manual.
Airmaster supplies the following brands of propeller blades: Sensenich, WhirlWind, Warpdrive, Bolly and Kiev. Varying in length and blade form to create the perfect match for any engine and aircraft combination out there in the market.
Airmaster can be contacted at the following addresses:
|Airmaster Propellers Ltd|
|20 Haszard Rd, Massey|
|Auckland, 0614 New Zealand|
|+64 9 833 1794|
Text adapted and used with permission of Airmaster.