Skip to main content

Questions tagged [efficiency]

Efficiency is the (often measurable) ability to avoid wasting materials, energy, efforts, money, and time in doing something or in producing a desired result. In a more general sense, it is the ability to do things well, successfully, and without waste.

14 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
2 votes
0 answers
197 views

Would a Tip Jet be more efficient or practical the bigger/longer it gets?

In summary, a tip jet is a jet nozzle at the tip of some helicopter rotor blades, used to spin the rotor without much torque. Source of the picture (it is an article) One of the types of Tip Jet is ...
mandiokai's user avatar
  • 620
1 vote
0 answers
47 views

Are Runway Profile Descent charts available to non-121 carriers? If so, where can I find them?

AIM 5-4-2(c) says: When crossing altitudes and speed restrictions are issued verbally or are depicted on a chart, ATC will expect the pilot to descend first to the crossing altitude and then reduce ...
Steve V.'s user avatar
  • 23.3k
1 vote
0 answers
122 views

Are Foward Swept Wings for a Rear Propeller Airplane Feasible?

Would going with a forward swept wing design, with the same cord and length of the "A Wing", bring more air the the propeller and tail to increase range, power, or stability? Consider the ...
Justintimeforfun's user avatar
1 vote
0 answers
166 views

Flying in V formation with multiple planes

Logistically choreographed using air-traffic controllers to pair like planes headed in the same direction or by scheduling flights together, how much fuel could be saved pairing planes to fly in a ...
Justintimeforfun's user avatar
1 vote
0 answers
450 views

Fuel consumption database using ICAO codes?

I will preface this by saying I do not have any level of knowledge in Aerodynamics - I'm a freelance journalist and so apologies for the poor level of general understanding. I'm attempting to create ...
BaronVonChai's user avatar
1 vote
0 answers
86 views

Would this be an accurate method of fuel consumption comparison?

I'm looking to compare the fuel consumption of regional jets in the US and the stated efficiency of the Bombardier CS100. At the moment, I'm considering using data from the Bureau of Transportation ...
gandalf's user avatar
  • 11
1 vote
0 answers
85 views

Are there any performance details available for the D8 Double Bubble engines?

For the D8 Double Bubble, what are the thrust requirements for the engines? Has it been stated what the estimated max thrust will be for each engine? Source: sputniknews.com
SRawes's user avatar
  • 1,211
0 votes
0 answers
34 views

What are the parameters typically used by airlines to assess the fuel economy and efficiency for their flights?

Are there parameters that are typically being used by airlines to assess the fuel economy and efficiency done in their flights? And how exactly those parameters are being used to do the assessments ...
Luthfi Ahmad's user avatar
0 votes
0 answers
387 views

What exactly does "efficiency" mean in XFLR5 wing analysis?

Can somebody please tell me what it is / how is it calculated? I initially thought it might be something with the Cl/Cd but I have another design with close to the same Cl/Cd, but with more than ...
Vincent Cerowski's user avatar
0 votes
0 answers
154 views

Sea-Going Ground-Effect Vehicle

Is a Ground-effect vehicle (a.k.a. ekranoplan) practical in seas near the coast (e.g. the US East Coast, West Coast, and Gulf of Mexico)? I'm looking for a practicality answer, like, nope, cannot be ...
ekranoplan's user avatar
0 votes
0 answers
184 views

Why does adding more blades to a propeller/fan not show a decrease in efficiency?

According to this answer increasing blade solidity increases the blade area by either enlarging chord or increasing blade count both of which reduce efficiency via reducing the lift coefficient and ...
usernamechecksout's user avatar
0 votes
0 answers
189 views

What is the meaning of "Contra-Rotating Propeller Increases Efficiency"? How is it calculated?

This picture is taken from here. In that video is mentioned that contra-rotating propeller increases efficiency up to 6-16%. Regardless of the number that could be vary from one airplane to another, ...
AirCraft Lover's user avatar
0 votes
0 answers
144 views

At what operating temperatures would the Trent 900 need to operate, to equate to the efficiency of current geared turbofans?

What is the minimum optimum operating temperature (in degrees Celsius) that would be required for the Trent 900 to operate at, for it to attain the level of fuel efficiency of current geared turbo ...
securitydude5's user avatar
-4 votes
1 answer
264 views

Would an extra fan make turbofans more efficient in cruise?

A turbo fan engine cannot use all of its available thrust in cruise any longer that it normally does at today's technologies, otherwise it would risk a meltdown of the internal hot engine parts and ...
securitydude5's user avatar