Linked Questions

0 votes
1 answer
253 views

At which speed is a plane traveling at hypersonic? [duplicate]

What is the measurement used when a plane is said to travel at hypersonic? How does the air act at the nose of the plane? Would the nose and wing have to be razor sharp to cut the air? because the ...
user avatar
11 votes
3 answers
6k views

Aerodynamic advantage of blunt noses and WHY (subsonic)

Compared to a sharper conical nose, a blunter conical nose is aerodynamically superior in subsonic flight. My question is why. I've read a lot about this and allegedly: A blunter nose accepts a wider ...
Aerocurios's user avatar
8 votes
3 answers
5k views

Why should the leading edge be blunt on low-speed, subsonic airfoils?

I have read that is to help the flow remains attached, but I do not understand the physical principle.
XF-91's user avatar
  • 2,096
7 votes
3 answers
5k views

Can a steady flow have stagnation points?

I am confused by this idea. If a flow is steady, its streamlines are unchanging. Taking the typical example of an airfoil, there is (at least) one streamline which will hit the leading edge of the ...
midnightBlue's user avatar
12 votes
2 answers
3k views

Can a supersonic plane use a subsonic wing if the nosecone shock produces subsonic airflow around the wing?

A supersonic plane will produce shock waves off the nose cone, as seen below: These oblique shocks reduce the speed of the air that the wing experiences. If the plane is at a low enough Mach number, ...
Gus's user avatar
  • 1,029
3 votes
4 answers
850 views

What is this transport aircraft, and why does it sometimes cary an air data boom when the Soviet Buran Space Shuttle is on top of it?

This comment in chat points to a "google search of the day" which was for Buran the Soviet version of the Space Shuttle. Looking there I saw images of a large transport aircraft with the Buran shuttle ...
uhoh's user avatar
  • 5,758
5 votes
1 answer
2k views

Does skin friction drag decrease with velocity?

The wings of subsonic planes have usually a very low surface area and aspect ratio as big as possible. However, in supersonic aircraft, wings with more wetted area (e.g delta wings) are used. Is this ...
user15037's user avatar
5 votes
2 answers
1k views

Is hypersonic flight possible with a Busemann's Biplane?

The modifications to the Busemann's Biplane design reported in this article have proven that it is possible to design a modified Busemann's Biplane wing design that actually produces lift at ...
securitydude5's user avatar
2 votes
2 answers
682 views

Blunt noses subsonic drag - why a complete ellipse?

At subsonic speeds, blunt noses - both fuselage and airfoil - are good for two reasons: the need to maintain attached flow at varying angles of attack. it has less surface area for the volume, ...
Abdullah's user avatar
  • 3,524
8 votes
1 answer
306 views

Since shock waves have non-negligible viscosity, why do the normal shock relations ignore friction/viscosity?

The normal shock relations (seen below) are derived by using steady, 1D, neglect potential, no shaft work, adiabatic and zero viscosity assumption. However, since shock waves are "thin regions of high ...
Nick Hill's user avatar
  • 606
3 votes
1 answer
492 views

Why does the Tu-134UBL have a sharp/pointed nose cone?

Russian/Soviet aircraft design has always intrigued me, and even more so when coming across this photo of the Tupolev Tu-134UBL with its pointy nosecone. Having looked up the performance ...
FZ123's user avatar
  • 75
6 votes
2 answers
649 views

Why is the cross-sectional shape of some airliners' nose not perfectly a circle?

I found that the cross-sectional shape of some jet airliners' nose is not perfectly a circle. For example the Boeing 737 aircraft: (source: aeroprints.com via Wikimedia Commons, CC BY-SA 3.0) Look at ...
Frank's user avatar
  • 415