This technique shows a simple way to make correctly sized decals for downscaled/upscaled rockets. The first step is to obtain a scan of the original rocket's decals. Once they are obtained, open it in a picture editor. A common editor like Paint will work fine. In this case, the decal will be resized to fit a BT-5 downscale of the Estes M-104 Patriot. Now the scale factor must be obtained. A simple way to find out what it is: take the diameter of the downscaled/upscaled rocket and divide it by the diameter of the original rocket. Convert it into a percent. In Paint, go to Image and then Resize/Skew.

In the resizing section, enter the percent obtained earlier (make sure the percent is rounded to the nearest integer – Paint will not accept decimals) in both Horizontal and Vertical.

Now, click OK. The resizing is now successful and now can be printed and applied the rocket.