Of course I figured these off the plans wing then saw you wanted the Diehl. Duh.
Anyway, here is how you figure it out. The area of the center section is the length (87" by the plans) multiplied by the chord (48" by the plans). That gives you the area in square inches. Divide that by 144 if you want it in square feet. The outboard wings are trapezoidal so add the chord of the root (48" for plans built) to the chord of the tip (36" by plans) then divide by two to get the average chord. Multiply the average chord by the length of one outboard wing to get the area. Multiply that by two to get the area of both wings and add it to the area of the center section to get the total wing area. Divide that total by the overall length of the entire wing to get the MAC of the whole wing. Divide the length of the whole wing by the MAC and that gives you the aspect ratio. Do it all in square inches or all in square feet then convert as necessary. Now Dan, get a piece of chalk and do one one the board. Brian Kraut Engineering Alternatives, Inc. www.engalt.com -----Original Message----- From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net]On Behalf Of Brian Kraut Sent: Tuesday, April 18, 2006 9:54 PM To: KRnet Subject: RE: KR> Formulas area 75 sq ft MAC 44.29" Aspect ratio 5.59/1 Not sure what the dihedral is off the top of my head. Seem to remember 8" at each tip? Wing loading is whatever you are figuring for the weight divided by the 75 square feet. My square footage is figured from a CAD drawing adapted from old 3 view drawings I scanned a while ago. I think the plans state 78 square feet, but it depends on the wing tips you do or any other mods done. They will skew the other numbers a little also. Brian Kraut Engineering Alternatives, Inc. www.engalt.com -----Original Message----- From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net]On Behalf Of Dan Heath Sent: Tuesday, April 18, 2006 7:04 PM To: kr...@mylist.net Subject: KR> Formulas Does anyone have the formulas for calculating these, or what to measure to get these: Wing Airfoil: RAF48 Total wing area: ? sq.ft Mean Aerodynamic chord: ? Aspect ratio: ? Dihedral: ? Wing Loading: ? Please mail me directly at da...@alltel.net You can just click on the mail link provided. This is for the Diehl long wing, for my POH See N64KR at http://KRBuilder.org - Then click on the pics See you in Mt. Vernon - 2006 - KR Gathering There is a time for building and a time for FLYING and the time for building is OVER. Daniel R. Heath - Lexington, SC _______________________________________ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html _______________________________________ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html
