PDA

View Full Version : Help! Help needed with my school investigation


Budget_man
Jun 05, 2009, 07:43 AM
Hello all! Found this section of the forums a while ago and thought it would be a great help for my school project if I needed it, and now well...I need help! :rolleyes:

Basically my project is investigating different wing types, ie researching many different types to see what they are designed for, and building and testing them to see which is best for what application. An important point in my investigation also is that this is all to do with MODEL aircraft. Thats it in a very simple way, but this is a whole year investigation which has to be very academic and thoroughly documented. Right now I've hit a trouble spot; I've realized that there are far too many wing types for me to possibly build and test, so (this is where you guys come in!) I need to know what are the most widely used airfoils and what they are used for.

Now I've already discovered that the system of naming all airfoil sections under generic terms such as "under cambered" and "flat bottom" must be abandoned because there are just so many under each category and it does nothing to explain them properly. I've already written a bit about the KF airfoil sections, Clark Y, and symmetrical profiles but I need more! So any help with finding airfoil profiles suitable for documenting and testing would be greatly greatly appreciated.

Also once I've documented a decent number of profiles I am going to build a wind tunnel to do some smoke testing on each before I fly them, make a hypothesis on what they will do in the air and see if the flight data fits with my hypothesis.

I've already borrowed an invaluable book to help me and it has thousands of airfoil profiles in it, but theres so many! and it only explains a few. Of course I will recognize ALL sources and give proper credit to everyone who helps me.

If you've read through all that and still fell like helping, please post info here! :o Also if you need any more description from me just ask away.

*EDIT* Oh yes I forgot to say all this is for a small indoor plane so that weather is not a problem.

smh20502
Jun 21, 2009, 07:49 PM
here is a link to a site that contains many airfoil shapes

http://www.ae.uiuc.edu/m-selig/ads/coord_database.html


are you building multiple wings and comparing them? Or, are you trying to find just one to build?


try this software out....

http://www.profili2.com/eng/default.htm

ATONAL6173
Aug 17, 2009, 02:09 AM
Usually, young (and old) researchers attempt to study wayyyyy too broad of an area. Pick something very specific, there will be plenty of work and data in even the smallest focus.

Currently their is vigorous debate as to the function, benefits, drawbacks of a "KF" wing. Based on a world-record paper airplane design, KF wings are two or more flat plate wings, one shorter than the other so that there is a "step" the air has to go over. It creates a vortex that has a similar effect as the traditional airfoil. We are always debating the construction, benefits, drawbacks of KF airfoils and love even the smallest scrap of scientific evidence. Like comparing KF airfoils or having different sized "steps" or different lengths of "steps". 40% or 45% is a common question. Dave Powers at www.rcpowers.com has a great simple video showing some different KF airfoils.

But the most important question is, "Do you fly already, or know somebody who is addicted already, particulary with scracthbuild experience?" Because just getting a plane you've built to fly is a long, frustrating process at first. If you're new to the hobby, just learning how to build and fly an RC plane and the scientific processes and knowledge involved would be plenty big and repsectful enough of a project!

Take a look at my posts and the sub-forums I post in to see lots of easy, tough designs. Browse through the scratchbuilt-foamies section to see lots of planes to build out of relatively inexpensive materials. The price to get into the hobby has fallen a lot in the past 8 years or so. My favorite supplier is www.hobbycity.com. Here's a list and a designer that could get you in the air for around $200 (just a guess, it could probably be done for less, and I can attest to the products - I've spent way too much money there)
Beginner's shopping list
http://www.rcgroups.com/forums/member.php?u=36945