Hello,
Not quite sure if it should be under "what if.." section, but if the place should be changed pls do not hesitate:)
Now let me represent the Wilhelm Zurovec patent for replacing hydrogen-filled observation balloons.
I have used old Eduard PKZ-2 helicopter no. 8015, but the engines in the mold were so obsolete that I had to find replacement. Thus 3 pcs of new smallstuffmodels Gnome 100hp resin engines constitute a kind of refreshment for this old kit. Those new engines are just gorgeous even though was hard to assemble them:)
Here you have small comparison:




next job must be done to the shock absorbers, just to resemble those from real photos
regards
K