Questions tagged [tail]

Questions about the tail part of an aircraft, also called the empennage.

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16
votes
3answers
4k views

What are the benefits of a non-orthogonal (scissor) tail-rotor?

Why is the tail-rotor of some helicopters (e.g., Boeing AH-64 Apache) made of non-orthogonal (scissor) blades? What are the aerodynamic benefits (or any other benefits) compared to the orthogonal ...
15
votes
1answer
1k views

What is this object on an MD-11?

There is something above the engine on the tail of this MD-11: What is that? Source
5
votes
3answers
564 views

What is this tab above the DC-10's #2 engine? [duplicate]

What is this big rectangular tab (?) thingy extending backwards just above the DC-10's #2 engine? What does it do? (wikimedia.org, picture modified to point out the tab thingy)
4
votes
1answer
1k views

What effect does downwash have on the horizontal stabilizer

Fighter aircrafts usually have their horizontal stabilizers in lined with the main wing which would subject it to downwash. How does this effect the stability of the aircrafts and the effectiveness of ...
3
votes
2answers
4k views

How are empennage airfoils chosen?

Empennage airfoils are usually symmetric. What is the process behind choosing the airfoil used in the tail of the airplane? Is it related to the stability? And then how would the angle of attack of ...
20
votes
2answers
4k views

Why do T- tail airplanes have a shorter vertical stabilizer?

Airplanes with a T-tail design have a shorter vertical stabilizer than the conventional design , what is the reason?
16
votes
2answers
5k views

Why is the horizontal stabilizer root interface designed this way?

Most large aircraft have a similar design for their trimmable horizontal stabilizer: they connect to the tail cone on a flattened area which allows them to be rotated within some range: From left to ...
17
votes
2answers
2k views

Why are the tails always painted, but not the fuselage, in test and delivery flights?

Granted some airlines prefer to paint their own planes, but we always see planes like the one below, protective coating everywhere but the tail. Why's that? (Source)
7
votes
3answers
618 views

What prevents aircraft with a tailcone APU from using tail-mounted airbrakes?

The BAe 146 and Fokker F-28, which are virtually alone among jetliners in lacking thrust reversers, compensate by using large, tail-mounted airbrakes to help slow the aircraft during descent and ...
7
votes
2answers
2k views

Why is the DC10/MD11/TriStar vertical stabilizer noticeably smaller than other contemporary aircraft?

Why is it that these planes had vertical stabilisers that were noticeably smaller in proportion the aircraft itself to other aircraft? I understand that they had the engines mounted on the tail but ...
4
votes
2answers
1k views

Is there a formula to calculate how big a ventral fin should be?

I've been doing some research into vertical stabilizer designs for a university assignment and have come across ventral fins. I've found a fair bit of information on why they're fitted but can't find ...