All Questions
Tagged with aerospace-engineering aircraft-design
24
questions
-3
votes
0
answers
35
views
Deriving the longitudinal equations of motion for an aircraft
I'm trying to create a state-space model for the pitch control of an aircraft as described here:
https://ctms.engin.umich.edu/CTMS/index.php?example=AircraftPitch§ion=SystemModeling
The ...
8
votes
6
answers
5k
views
Can we add treadmill-like structures over the airplane surfaces to reduce friction, decrease drag and producing energy?
I am curious about a method to enhance the efficiency of passenger aircraft during cruise speeds by integrating treadmill-like structures on the fuselage and beneath the wings without changing the ...
- 81
0
votes
1
answer
74
views
Failure criteria for CFRP single plate bolted joint
Which equation can be used to find failure based on ply orientation.
Tension,shear & bearing faliure to validate against fem analysis
0
votes
1
answer
136
views
In an aircraft, should I connect flanges of wing spars' to the fuselage, or webs of wing spars' to the fuselage?
I am actually trying to understand which option is going to be a more relaible for the wing-fuselage attachment. Should I choose a connection between the flanges of the spars within the wing to the ...
- 1,365
4
votes
2
answers
3k
views
In case a plane stalls, what should stall first, the tip or the root of the Wing? Why?
In case a plane stalls, what should stall first, the tip or the root of the Wing?
Why?
- 338
2
votes
1
answer
52
views
Where can i get the aerodynamic data of aircrafts for controller design and testing?
I have some research papers on aircraft controller design that i want to simulate, but no system data is given in the research paper itself. I am also unable to find the aerodynamic data for any ...
1
vote
1
answer
629
views
Aircraft Longitudinal and Lateral Transfer Function Terms
The figure shows input and output variables for both longitudinal and lateral stability transfer functions.
I completely understand what each term stands for but I was wondering what would be the ...
- 111
0
votes
2
answers
68
views
Using RC scale-down model to pre-test aircraft design
I'm a bit involved into building an actual airplane. And while the guys go conventional ways, I'm trying to look around to see other solutions.
One of that is to try and use and RC scale-down model (...
- 1
0
votes
1
answer
165
views
How do you determine the L/D ratio of F-117 Nighthawk?
I was trying to look for an L/D ratio published everywhere on the web and I can't seem to find it (for a project). Since I couldn't find it, I wanted to try calculating myself. Can't seem to find $C_l$...
1
vote
1
answer
206
views
Propeller design
I see on internet, that aircraft propellers most effective blades angle only 15 degrees on every blade. Why propellers not use 45 degrees angle on propeller's blade that give more thrust on the ...
- 21
2
votes
1
answer
118
views
Name of a keel between the bilge keel and the main keel
I'm working on a seaplane and find myself doubting about the specific nautical term for a keel placed between the bilge keel and the main keel. This might be a bit academic in nature since I have a ...
6
votes
1
answer
10k
views
Do all airfoils have a lift curve slope of $2\pi$?
I know that according to the thin airfoil theory all airfoils (symmetric or not) have lift curve slope of $2\pi$. I also know that finite wings should have less inclined lift curve because of the ...
- 63
1
vote
1
answer
2k
views
Wingspan formula for an Ornithopter
How do i figure out what the wing area/sqft needs to be for a functioning wing-flapping ornithopter? Lets say for example there is 500# of force moving the wings up and down, and the wings and ...
- 19
-7
votes
3
answers
430
views
Can a blimp enter Mar's atmosphere as a glider?
I saw a high altitude jump where someone had exceeded the speed of sound before the air slowed him down enough to deploy a parachute. While inflated in space could a blimp enter the atmosphere while ...
user4139
0
votes
2
answers
614
views
How can we prove that Thrust-to-weight ratio depends by max speed?
Raymer (see source below) affirms "Thrust-to-weight ratio is closely related to maximum speed". Why? How can we demonstrate it?
Source: Daniel P. Raymer Daniel P. Raymer "Aircraft Design: A ...
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