Aviation Stack Exchange Community Digest

Top new questions this week:

What are the spikes on Ingenuity's blades?

I am puzzled by the spikes on Ingenuity's blades (marked by a red box in the image below). What is their function ? Are these special to Ingenuity? Why don't they collide during high RPM? Don't they ...

helicopter rotor-head  
asked by lineage 17 votes
answered by Martin 17 votes

What kind of problems can a flight have if passenger weight is miscalculated?

There was a widely reported news story about a TUI Boeing 737 flight, where a bug in reservations system caused 38 passenger on the flight to be allocated a 38kg standard weight as opposed to the ...

airliner boeing-737 weight-and-balance  
asked by Mavrik 14 votes
answered by Bianfable 23 votes

What is this cylinder covered in threaded studs and what is it for?

I can't figure out what this is. It looks like each post is threaded, but why is a mystery to me. My guesses include a grounding post, a bolt/nut testing stand that's not actually in an aircraft, or ...

aircraft-maintenance feature-identification  
asked by Nate Lowry 14 votes
answered by John K 28 votes

What are these four tubes for in the intake for an Extra 300?

The fuel-injected engine has six cylinders, so it's not a "per-cylinder" thing nor is it related to a carburetor. P.S. That screen is the entirety of the air filter. Apparently it's meant ...

feature-identification inlet extra-aircraft  
asked by Kenn Sebesta 8 votes
answered by ymb1 7 votes

Can flaps be used to perform rotation and flare?

TL; DR using flaps to directly control sink/climb rate near ground = simpler and faster response = easy to fly airplane? Rotating is the pitch up during takeoff that causes the aircraft to leave the ...

landing wing takeoff flaps control-surfaces  
asked by Abdullah 8 votes
answered by Grayson Bertaina 8 votes

Why do the engine nacelles on the P2V Neptune extend so far back?

I was studying a picture of a P2V Neptune seen from below, and what struck me was how far back the engine nacelles reach. Unfortunately, I can't find that original photo but this one shows what I'm ...

aircraft-design nacelle lockheed-neptune  
asked by ThatCoolCoder 8 votes
answered by ymb1 23 votes

Why do X-wing configurations missile/guide bombs use symmetric airfoils?

From all the missiles/guide bombs I have come across, I've always observed that a symmetric airfoil is used for both the wing and tail. Why not have a cambered airfoil for the wing and a symmetric ...

aircraft-design aerodynamics flight-controls airfoil missiles  
asked by jocasta17 7 votes
answered by U_flow 9 votes

Greatest hits from previous weeks:

What is the fastest single-engine civil turboprop aircraft with cabin seating?

I was having a discussion with some friends about general aviation aircraft with cabin-class seating. We were discussing cruise speeds and there were some "shop talk opinions" flying around about what ...

aircraft-performance turboprop  
asked by ryan1618 13 votes
answered by fooot 12 votes

When to use beacon, anti-collision, strobe, logo, and navigation lights?

During taxi, the taxi lights are used, and I think the landing lights are required to be used up to 10.000 feet for all commercial flights. However, my question is regarding the abovementioned lights:...

faa-regulations aircraft-lighting  
asked by Haris 44 votes
answered by Lnafziger 36 votes

What are the main differences piloting Boeing vs. Airbus aircraft?

What are the main differences in flying a Boeing vs an Airbus aircraft? Ignoring cosmetics, e.g. nose/window shape (see How can I tell apart an Airbus from a Boeing?)

airbus boeing  
asked by Danny Beckett 52 votes
answered by Federico 50 votes

What do winglets do to increase aircraft performance?

It seems like a lot of the newer airliners have winglets or wing fences. How do they improve aircraft performance?

aircraft-design aircraft-performance winglets  
asked by flyingfisch 37 votes
answered by ratchet freak 31 votes

What is the difference between "flight level" and "altitude"?

I have seen references to "FL180" and "FL300", and I know that they stand for Flight Level 180 and Flight Level 300. I've also seen references to "an altitude of 18000ft" or "an altitude of 30000ft". ...

terminology altitude flight-level  
asked by FreeMan 38 votes
answered by casey 42 votes

What is Cost Index?

I'm not sure if it's just in Boeing aircraft, but I've heard that Cost Index has something to do with flight planning but have no idea what it is. What is it for and how is it calculated? (I'm happy ...

asked by Greg 29 votes
answered by DeltaLima 34 votes

What is the difference between Boeing 73G, 73H and 737?

I found a data source, where Boeing 737 could be encoded with the following values - 733, 734, ...

asked by LA_ 27 votes
answered by JulianHzg 34 votes

Can you answer these questions?

Does an increase in Mach number lead to a decrease in Total Pressure Recovery (TPR) for supersonic inlets?

I am curious if the total pressure recover for supersonic inlets, in general, decrease for an increase in Mach number.

engine-design supersonic inlet fluid-dynamics  
asked by Jose De La Pena 1 vote

How Jozza Bombsight worked?

I'm looking some information about the so called Jozza Bombsight used for example on board of the Savoia-Marchetti SM-79 during WWII. Thank you

aircraft-systems bombsight  
asked by Carlo Nava 3 votes

Is this wording that appears in the legend of the "Chart Supplement" re "airspace" actually used in any entry in the Chart Supplement?

On page 26 of the legend for the February 25 2021 issue of the "Chart Supplement" for the NE region of the US, in reference to airports where Class D airspace converts to surface-level Class ...

asked by quiet flyer 2 votes
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