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Results tagged with propeller
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user 42636
Aircraft propellers are airfoils which convert rotary motion from a piston or turbine engine into thrust suitable for propelling an aircraft.
20
votes
In 1924, why did aviators use an oak propeller for pontoon aircraft and walnut propeller for...
This has to do with the properties of the wood: oak and walnut are both strong, non shrinking and resistant to warping.
Oak is a heavier and very water resistant. Walnut on the other hand, while light …
- 30.5k
19
votes
Accepted
Can you weld a propeller blade from 120 degrees to 180?
This is a fine story, but:
When you see real propeller hubs, you'll quickly understand that one does not simply transform a 3 blade into a 2 blade with simple cut and weld methods:
(picture source: e-bay …
- 30.5k
17
votes
Accepted
How do witness marks on propeller blades provide data on estimated blade angles at the time ...
It is a part at the root of the propeller, inside the propeller hub:
As the propeller hits the ground (or any solid(ish) object) the force of the impact is relayed all the way to the bottom of the blade … Picture source: Propeller Owner's Manual - Harzell Propeller Inc. …
- 30.5k
16
votes
2
answers
5k
views
Why don't NK-12 powered contra-rotating propellers turn in equal rpm?
The two frames above show the aft propeller's lag after the forward propeller moved a quarter-turn. … What is the reason the front propeller has significantly higher rpm compared to the one behind it? …
- 30.5k
8
votes
Why have propeller engines never been mounted on the tail in production transport aircraft?
Mounting propeller engines on wings is easy, as clearance from fuselage is not a problem, no extra structures are needed and the engine nacelle/fairing often provides a convinient space for landing gears …
- 30.5k
5
votes
Could a torque converter be used to couple a prop to a higher RPM piston engine?
In addition to John K's answer there is one more consideration: the heat the torque converter produces. Cars run at about 15% "power setting" when cruising, airplanes run at about 75%. TC will run hot …
- 30.5k
4
votes
In constant speed propeller, if i increase RPM lever from 2300 to 2500, will the Blade AOA d...
When you adjust a constant speed propeller to a higher rpm, this will be done by making the propeller blade AoA smaller. …
- 30.5k
3
votes
Accepted
Are the A400M propellers rotating in the wrong way in "Mission Impossible: Rogue Nation"?
The propeller blade angle in A400M, as in any larger modern propeller aircraft is adjustable. … To prevent thrust from forming during and immediately after start, the propeller adjustment is set to feather by pilot, this prevents the propeller angle change as oil pressure in the system rises and …
- 30.5k
3
votes
Accepted
How does Propeller windmilling work?
The propeller works in a same way: the engine drives the propeller that "screws" through the air.
It also works the other way around. … Now, in the case of you no longer twisting the screwdriver handle or the engine driving the propeller, there is no longer a force driving the screw or the propeller through the medium they are engulfed …
- 30.5k
2
votes
Were propeller airplanes significantly more "scary" to fly in compared to modern jet ones?
I personally never experienced older propeller aircraft (80's, so a bit outside the scope of this question) as any more scarier than the modern jets. … As a kid, I flew several times on a regional propeller aircraft about the size of EMB 120 mentioned in a previous answer. …
- 30.5k
1
vote
Do contra-rotating propellers have the same RPM?
TU-95 propellers turning ratio is such, that for each full turn of the front propeller, the one behind turns a little more than half a turn: TU-95 engine start on Youtube. …
- 30.5k
1
vote
Why does the centrifugal twisting force move variable pitch propellers to fine?
It is induced by ballasts connected to the root of the blades via a mechanism such that when the spinning motion of the propeller induces a force on the ballast, it will (in most cases) force the blades …
- 30.5k