I didn't realize the emblem was brass colored with the inside the color of the cowling. That would be very tricky to produce with a home brew decal.
About the only solution I can offer is a black overlay to apply to a gold painted disc on the cowling. The black decal would simulate the 'negative space" of the logo -- the black cowling showing thru as it were.
Not a perfect solution but all that is really practical without being able to print white. The other solution available would be to print them on white film, but them two drawbacks appear-- the "brass color" will look very fake, and I am afraid a white circle surrounding the decal on the edges would be very difficult to avoid.
I am going to be making some decals for Bertl in the next week or so, so I will give solution a a shot, but no big promises yet
