Bitmap to insert into the alpha channel of textures rotating propellers. 2, 3, and 4-bladed versions did for AI models DH6 Twin Otter and Britten Norman-2, 4-blade may also suit anyone. Resolution 256x256 pixels. All bitmaps are to RGB24bit to work in a graphics editor. (Attention, Data bmp are not suitable for direct copying to a folder simulator! For advanced users only) To insert data for alpha channels in texture screws and further conversion to MFS (DXT3) participating in the program Adobe Photoshop, Imagetool or similar to destination)