Minimum Power

[VictorBravo]

Re: Minimum Power

Been trying to find a plot of coefficient of lift for the 23012 but could only find 0012 in the old '39 data from NACA. Anyone have a Link for wind tunnel data for older airfoils that includes the 23012?
DC

There is a huge database online through Univ. of Illinois Urbana Champaign if I recall. If you do a Google search on the words Selig Drela Airfoil Database Illinois you should find it. I cannot imagine the NACA 23 series airfoil not having many many public records of the lift and drag plots. Selig and Drela are two young hot aero guys who are the current kings in the model airplane airfoil world, and they contributed to that online database. Selig I think was one of the faculty at UIUC.

[barnstmr]

Re: Minimum Power

There's an interesting NACA report # 2948 titled "Investigation of Lateral Control near the Stall - Flight investigation with a light high-wing monoplane tested with various Amounts of Washout and various lengths of leading edge slot"

It is quite lengthy 35+ pages. The tests were conducted at Texas A&M College in 1953 using a 65 hp Taylorcraft. The attached are some of the results as reported

[TimHicks]

Re: Minimum Power

It's in "Theory of Wing sections". I'm looking at the lift curves right now for NACA 23012 on page 498 - 499 of my edition.

[Hank Jarrett]

Re: Minimum Power

You can get the whole thing by going to:

http://ntrs.nasa.gov/search.jsp?R=230411&id=9&qs=Ntt%3D2948%26Ntk%3Dall%26Ntx%3Dmode%2520matchall%26N%3D0%26Ns%3DHarvestDate%257c1

and selecting "view PDF file" or going directly to:

http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19930083935_1993083935.pdf

The second one may not work for everyone since I am on the inside. It is a 3.5 MB Adobe Acrobat document file and if you have the download speed I could email it. Anyone want to post it to a site?
Hank

[VictorBravo]

Re: Minimum Power

It's in "Theory of Wing sections".

Yeah, I should have thought it was in Abbott and Costello as well...

[flyguy]

Re: Minimum Power

Tim, Think we had that book in our library at the defense contractor where I worked some years ago. Sounds very familiar.
Thanks for the name. I'm sure there is data on that airfoil in many sources. I was just looking for an easy find on the net.
I suspect the data marked 0012 in the NACA archives is for a generic version of that airfoil--sure looks just like it. I'm going to look around some more.
DC

[VictorBravo]

Re: Minimum Power

I suspect the data marked 0012 in the NACA archives is for a generic version of that airfoil
DC

Sorry to butt in, but any of those airfoils with 00 for the first two numbers are completely symmetrical airfoils. The first two digits, I believe, are the camber and perhaps the chordwise location of max camber. The last two digits are the maximum thickness expressed in percentage of total chord length. So the 23012 is a non-symmetrical wing and the 0012 is the symmetrical one.

[TimHicks]

Re: Minimum Power

Bill is exactly right. 0012 is symmetrical and 12% maximum thickness. All those with names like that follow suit.

Hank thanks for that paper with tuft testing with the Taylor Craft. That was excellent. I noticed that it was written by Fred Weick, the designer of the Ercoupe.

[flyguy]

Re: Minimum Power

Well guys that's really good because the 0012 plot of the stall area is about the weirdest thing I've ever seen. Has a straight down drop (dashed line) at the max lift hook/stall point--if I'm seeing the plot correctly. The quality of the chart is not real good on the NACA archives site.
I used to be able to tell exactly what a 4 or 5 digit airfoil was like from the number, but I haven't looked at that stuff for 20 years.
Your probably correct about the symmetrical airfoil, I guess I'll have to get a copy of "Theory ect." and check some other keys to the data so I understand what I am looking at. It will have to be an winter evening project as I am up to my ears with daytime ones.
DC