In K. Malinowski's PLZ P37A and P37B is what I am trying to do. They are the CFS2/FS2002 versions downloaded from Simviation.com. The planes work well in FS2004, but they shake when they get to 250 mph. I am clueless about what needs to be changed to get the planes to fly without the shimmy shakes. I changed the MOI to those recommended in Air Wrench, but the planes still shake.