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PROGRAM NAC4GEN Version 2.1" (C) BY Mr. Harold Ginsberg;May1995, Dec 1995, Jan 1996" B.S. AEROSPACE ENGINEERING" This program calculates & plots naca 4-digit airfoil section" It is written in Microsoft Fortran Ver 5.1.

It is based on formulas published in several books. It is accurate compared to published data. Circulated as shareware you can circulated it. You may not change it in any way, sell it, or use it in other programs.

This is version 2.1 It is a little more user friendly because it allow you to reenter if you make a mistake on the 1) & 2) questions.

Version 2. Corrected a small problem that was causing a warning about Math Error after program ran for one Airfoil section. This error did not affect results. It also, allows your to scale greater than 100, so you can uses Centimeter, Millimeters, or large foils. Also allows you to repeat the program with out going thought dos.

IF YOU LIKE THIS; PLEASE REGISTRATION IT AND YOU WILL GET A COPY THAT SAVES THE COORDINATE TO A FILE FOR $10 US FILL OUT THE REGISTRATION FORM BELOW and MAIL IT TO: Mr. Harold Ginsberg PO Box 1663 Lorton, VA 22199-1663 You can also registering this software on CompuServe.

Author: HAROLD GINSBERG CompuServe ID: [76660,3274] Program Title: NACA4GEN VERSION 2.1 Registration ID: 8844 Fee (US$): 10.00 This gives you file that save DOS data on airfoil.

Shipping & Handling Fees (US$): $5.

THE AUTHOR HAS A VERSION THAT GENERATES A DXF PLOT DXF CAN BE IMPORTED INTO MOST CAD & DRAFTING PROGRAMS NACA.dxf is an example of the DXF file generated by the NAC4DXF program. I recommend that you try importing it into your CAD program before buying it.

Author assume not responsibility for misuse of the data from output from this program. WARNING: COMPUTER SCREEN MAY DISTORT THE FOIL SHAPE.

NACA4GEN ORDER FORM (AI003) ---------------------------- SHIP TO : ----------------------------------------------------------------- User Name : Title : Address : City/State/Zip : Phone : Fax : METHOD OF PAYMENT _______________________________________________________________ _ Check Enclosed ITEMS _______________________________________________________________ Quantity Description Amount Sub-Total NAC4GEN Version 2.1 SAVE TO SCREEN ONLY ........ REGISTRATION $ 2.0 .........

........ Disk Copy& REGISTRATION $ 5.0 .........

NAC4SAV Version 2.1 SAVE TO Coordinates to a file ........ REGISTRATION $ 5.0 .........

........ Disk Copy& REGISTRATION $10.0 .........

NAC4DXF Version 2.1 SAVE DXF FILE FOR CAD ........ REGISTRATION $15.0 .........

........ Disk Copy& REGISTRATION $20.0 .........

Shipping .... # of disk * $5.0 .........

disks 3&1/2 ........ 5& 1/4 ........

High Density ........ Low Density ........

TOTAL .........

For Site licenses Please call.

To order please mail this form with your payment to: Mr. Harold Ginsberg PO Box 1663 Lorton, VA 22199-1663 76660,3274@compuserve.com