Hartzell 'How It Works' | Aero-News Network
Aero-News Network
RSS icon RSS feed
podcast icon MP3 podcast
Subscribe Aero-News e-mail Newsletter Subscribe

Airborne Unlimited -- Recent Daily Episodes

Episode Date

Airborne Unlimited-

Airborne-Unmanned w/AUVSI-

Airborne Unlimited-

AMA Drone Report-

Airborne Unlimited-

Airborne On ANN

Airborne 11.20.17

Airborne-Unmanned 11.14.17

Airborne 11.15.17

AMA Drone Report 11.16.17

Airborne 11.17.17


Airborne 11.20.17

Airborne-Unmanned 11.14.17

Airborne 11.15.17

AMA Drone Report 11.16.17

Airborne 11.17.17

Mon, Feb 01, 2016

Hartzell 'How It Works'

Constant Speed Propellers Explained By The Company

Ever wondered how a constant-speed propeller works? Here's an explanation of from the Hartzell blog about how constant-speed propellers power airplanes through the skies.

Constant-speed propellers are variable pitch propellers that automatically change pitch so that they maintain a constant rotational speed. Constant-speed propellers are able to partly rotate along their longest axis to take a greater or lesser bite of the air depending on the plane’s speed. These constant-speed propellers are especially critical for today’s modern aircraft engines.

The first constant-speed propellers were driven by centrifugal force, and operated in much the same way as the Watts governor that limited the speed of steam engines in the early half of the 20th century. Once the constant-speed propeller reached a specified number of rotations per minute, centrifugal forces caused weights to swing outward, twisting the propeller blades so they achieved a steeper pitch. As the airplane slowed, so too did the rotations, which eventually pushed the weights back in, twisting the constant-speed propeller back to its original, shallower pitch.

Today, propeller governors are fitted to propellers to automatically change their pitch, which helps keep engine speed constant. In newer models, the actions of the constant-speed propeller are achieved by pumping oil through the propeller shaft, which pushes a piston that controls the mechanism that alters the pitch of the blades. As airspeed increases, flyweights pull outward, compressing the speed spring, which moves the piston forward and allows the pilot valve to open on the oil sump and release oil in the governor hub.

It’s the propeller governor that controls the flow of this oil. This mechanism allows the engine to continue operating at its optimum speed, no matter what the actual speed of the aircraft itself as it moves through the air. This increased oil pressure alters the propeller pitch, slowing it to the correct RPM setting for optimum performance. As airspeed is lost, this process happens in reverse: the flyweights move inward, tension releases the spring, and the piston moves in the opposite direction, allowing oil to flow from the hub back to the oil sump.

So, there you have it. Constant-speed propellers today will automatically change the pitch of your propellers many times as you fly without you even noticing it, increasing the overall fuel efficiency and performance of your aircraft.

(Image provided by Hartzell)

FMI: Hartzell blog


More News

AMA Drone Report 11.16.17: Drone Registration, Drone Journalists Jailed

Also: Terror Advisory, DRL Sim, SureFly Octocopter, Space Needle Drone Pilot, FAI-ASFC World Fly-In Expo A bill that includes a return to civilian drone registration has been inclu>[...]

Airborne 11.17.17: Cabri G2 Heli-Upgrade, NBAA/KSMO, USAF Pilot Shortage

Also: Electronic Flight Bags, SNC's Dream Chaser, flydubai Buys 225 737 MAX, Scottish Airshow Nixed The FAA has approved Service Bulletin 17-009 for the Guimbal Cabri G2 that allow>[...]

Airborne-Unmanned 11.14.17: Drone Registration, AT&T's Flying COW, Pilot Charged

Also: Boeing Completes Acquisition, Drones For LAFD, DJI Seeks Transport Canada’s Help, Uber and NASA A defense authorization bill that includes a return to civilian drone re>[...]

Say What? AOPA Says Halladay Accident May Unfairly Taint Icon...

Executive Director Of The AOPA Air Safety Institute Says The Accident Could Give The Airplane An 'Unfair Reputation' E-I-C Note: OK... I'm a little stunned by this... not only does>[...]

Aero-News: Quote of the Day (11.20.17)

"I no longer know if personal aviation… the kind that we dreamed of as kids, and now attempt to pursue as adults, has a future… I just know that it if it is to have o>[...]

blog comments powered by Disqus





© 2007 - 2017 Web Development & Design by Pauli Systems, LC