IQuit
Topic Author
Posts: 17
Joined: Sat Mar 30, 2019 7:52 am

Aircraft design workshop

Tue Sep 03, 2019 2:56 am

There used to be an online website at desktopaero where you can design a passenger aircraft in a java application but it is no longer available. Is there any similar sites where you can do the same thing? What are the simplified equations used in calculating the aircraft performance?
 
flipdewaf
Posts: 2846
Joined: Thu Jul 20, 2006 6:28 am

Re: Aircraft design workshop

Tue Sep 03, 2019 11:14 am

What do you mean by 'performance'?

Laws of thermodynamics and motion are the best starting points.

Fred
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IQuit
Topic Author
Posts: 17
Joined: Sat Mar 30, 2019 7:52 am

Re: Aircraft design workshop

Mon Sep 09, 2019 7:37 am

Performance parameters suck as range and takeoff distance.
Where do you proceed from laws of motion?
 
flipdewaf
Posts: 2846
Joined: Thu Jul 20, 2006 6:28 am

Re: Aircraft design workshop

Wed Sep 11, 2019 2:56 pm

IQuit wrote:
Performance parameters suck as range and takeoff distance.
Where do you proceed from laws of motion?

Simplified Range means its probably the breguet range equation you want.
Image

For takeoff its more complicated as there are different phases and conditional arguments required.
To get an idea you can determine the required velocity required for takeoff by knowing (or estimating) the maximum lift coefficient of the wing in its takeoff configuration and use:
lift = Lift coefficient * 0.5 * density * velocity^2 * Wing reference area

then its as simple as using S=ut+1/2at^2 (distance traveled by an accelerating body) to determine how far it has to go to get to that speed.

If you want to start being able to estimate things with any more accuracy then some light reading needs to take place. The Stamford course notes are good but quite heavy and there are great resources from NASA.

Fred
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IQuit
Topic Author
Posts: 17
Joined: Sat Mar 30, 2019 7:52 am

Re: Aircraft design workshop

Sat Sep 14, 2019 4:13 am

Thanks! Will read more.

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