The FAA's Pilot's Handbook of Aeronautical Knowledge (FAA-H-8038-25B), defines thrust line as, "An imaginary line passing through the center of the propeller hub
, perpendicular to the plane of the propeller rotation." That's pretty simple, though, and doesn't consider jet aircraft, so for our purposes let's use something a bit more universal: "Thrust line is the mean vector of an airplane engine's power output."
The aircraft also had a black propeller in place of the earlier white one and an aerodynamic spinner over the propeller hub
. There's also a much better view of the trapeze-like landing gear assemblies, which are of the general style found in patent documents that Otto Aviation has submitted relating to a number of the aircraft's features.
An approximate effective diameter is measured by eliminating the propeller hub
and thin tip section.
No one likes to play bumper boats, and surely no one wants to unwind fishing line from their propeller hub
during a relaxing day of fishing.
When the prop dome was removed for troubleshooting, the CDQAR found four broken spline teeth on the propeller hub
(these teeth align and lock the propeller dome to the propeller hub
when everything is indexed and tightened down).
I learned this one night in San Jose when, during my preflight before heading home, I found my right-engine nose cowl densely spattered with orange-brown grease that emanated from the propeller hub
. I didn't have a home number for anyone at Tom's Aircraft in Long Beach where I do my annual inspections.
Nowadays, propeller blade pitch adjustment occurs through either the action of an electric or hydraulic control unit integrated within the propeller hub
. At takeoff, the pilot (or an automated control system) can set the propeller blades at a lower pitch angle.
The propeller hub
from Russell's Mk Vb Spitfire will be part of the sculpture next to a roundabout being named in his honour, 100 metres from the crash site.
At booth 2632, DuPont will display a propeller hub
isolator developed by Mercury Marine that is designed to deliver quiet, smooth gear shifting for marine engines.
The graverobbers also stole the plane's engine, 20mm cannon, gunsight, survival pack, air compressor bottles, propeller hub
, instrument panel and head and seat armour.
The takeoff-power limitations posed by fixed-pitch props led to engineers figuring out a way to pivot the blades in the propeller hub
, thereby changing their angle of attack.