I tried that site before. It gets me to the TO 1-1A-1 which is the general manual of aircraft repair, but it doesn't get me to TO 1-1A-8.
Interestingly, the 1-1A-1 does in fact reference the 1-1A-8, but there is no link to it.
Does anyone know the new title for the manual called, "Engineering Manual Series for Aircraft and Missile Repair Structural Hardware"?
Used to be titled AF TO 1-1A-8 or Navair 01-1A-8 or Army TM 01-1A-8.
I can't find it with any Google or Dogpile searches.
Did it get picked up as an SAE-AMS...
Thanks, that rule of thumb seems to be repeated in Nicolai's book as well, so that makes use of actual (2D) airfoil L & D graphs (the CL and CD values), but the lifting line equations don't use CL or CD, all they use is CLalpha (the slope of the CL vs AoA curve).
Actually, to back up just a...
Yes, I need to get a copy of Raymer's Acft Design Book to compare against. I am currently using "Fundamentals of Aircraft Design", by Leland Nicilai from Univ of Dayton. A pretty good book. Lays out the formulas pretty understandably.
Well, I've found formulas for calculating propeller thrust and they don't look too hard, although for this level of calculation, just grabbing a number between 80%-87% is probably close enough. I'm just surprised that I can't find any formula that approximates skin friction drag. You're right...
Sorry, different abbreviation, Airspeed (A/S), Aspect Ratio (AR). The AR sometimes seems hard to find as manufacturers rarely list it but it can also be found by AR = b^2/S (b-wingspan, S-surface area), which manufacturers always list.
Yeah, the 2D drag curve, especially at cruise (min drag)...
Actually, I came up with something that involves a little bit of intuition. If we make a guess and say that the max airspeed will be about . . . say 300 knots and we definitely know the weight (say max gross weight of A/C), then we can work it backwards to solve for the actual max speed CL...
Good tease.
I loaned her my copy of "Theory of Wing Sections", so she knows how to look up CL vs Aoa and Cd vs CL curves. I also pointed her to the Aerospaceweb.net website that pretty much lays out all the formulas. This is really a question for me, as I noticed that all those formulas were...
Hi, I'm trying to help my teenage daughter with a science project where we take 2D airfoil lift and drag curves and relate them to to the actual wings of real airplanes and see how close we can calculate stall speed and max speeds of the real world airplanes. We went to a lot of trouble picking...
I don't understand how you get that 1.1 factor? Is that an actual number or just an example of a factor to account for averaging the CL's? I could see how you would use three CL's in the formula in this way: Sqrt((Wt)*(2/(rho*((CL1*S1)+(CL2*S2)+(CL3*S3))))--I hope I got the correct number of...
Thanks Wes. I think I'll tell my teenager to switch to an airplane that has a single airfoil that we can look up and find the Lift and Drag curves for.
That's exactly what I was getting at. If a BAC airfoil was the same as a NACA 64a-315 (just an example) then I could look up the L and D graphs for that wing.
Even if not that, then if there was some way of getting the Boeing L and D graphs for analysis would be sufficient.
Well the B-707 uses BAC 310/313/312 airfoil, the B-727 uses BAC 424/425/426/427 airfoil.
Not sure how the FAA certifies airplanes, but I would have thought that they'd file drawings with the Gov't somewhere, that something as basic as the airfoil shape wouldn't be kept secret, do they usually...
