Rush744 From United Kingdom, joined Dec 2006, 11 posts, RR: 0 Posted (7 years 11 months 2 weeks 4 days 19 hours ago) and read 2260 times:
Hey guys i am currently studying Aerospace at the University of Hertfordshire, London, UK.
As one of our modules we have been asked to design and develop an aircraft, i have been designated the stability and control.
Our aircraft has a Double Delta shape wing, with a vertical stabiliser, however i have run into some problems. I have looked through numerous books and looked on many websites yet have not been able to find a way to calculate the control surface sizes for the aircraft. We have chosen to use elevons/flaperons (like those on the eurofighter) on the wing and just a rudder within the stabiliser.
Would anyone be able to help me in anyway possible?
I have not been able to find any rule of thumb that will shed light onto calculating the elevon size with regard to size of wing, or the size of vertical stabiliser.
Vikkyvik From United States of America, joined Jul 2003, 10463 posts, RR: 26
Reply 2, posted (7 years 11 months 2 weeks 4 days 17 hours ago) and read 2232 times:
Quoting Rush744 (Thread starter): As one of our modules we have been asked to design and develop an aircraft, i have been designated the stability and control.
It might be helpful if you told us what specific class this project is for. As in, how in-depth does it need to be? If it's for a basic Intro to Flight class, then you probably don't need to go into too much detail. But if it's for a Flight Mechanics class (a.k.a. static/dynamic stability, etc), then you'll definitely need to do some research.
I'm a little surprised that they're asking you to do this without having gone over this sort of stuff (at least for "normal" airplanes).
BritJap From Japan, joined Aug 2006, 280 posts, RR: 2
Reply 3, posted (7 years 11 months 2 weeks 4 days 3 hours ago) and read 2199 times:
This is great...I also had a look at Hertfordshire Uni when I was choosing three years ago but chose Manchester in the end!!
I think this project must be very typical of all Aero Eng courses in the UK cos we did also had to do an aircraft design module.
I am guessing that your project is a group project and running along the same lines as mine did, so you will have several group members in charge of different fields.
Unfortunately however I was not the stability guy on our team, so I am not an expert.
But IIRC the method we used for Initial control surface sizing, as FredT suggested, was actually simply empirical. (Though I object to this being refered to as a "school project" )
The chosen size does need to be validated however, and that is a Much Much more complex and involved task.
But for now, just try to find control surface sizes as percents of chord lengths for existing airframes.
If you want a short explanation of the validation I mentioned just ask.
Rush744 From United Kingdom, joined Dec 2006, 11 posts, RR: 0
Reply 4, posted (7 years 11 months 2 weeks 4 days 2 hours ago) and read 2189 times:
Quote: It might be helpful if you told us what specific class this project is for. As in, how in-depth does it need to be?
Hey guys, well its a final year project, we have been asked to design a space aircraft similar to spaceship one. we need to be able to test our deisgn by inputting the values we obtain into the uni flight simulator to see if it flies. we are bascially doing all the design stages up till the actual build etc. we wont actually build it, but will get a feel of its characteristics.