here is that original Spitzy that I used in all those hollow logs long ago. I somehow hung onto it all these years and not even sure why?

Anyway while I went through many of the Scientifics all of the ones ever avalible to me at the time were not the few build up wing versions in those cool full page magazine adds but the simple plank solid wing, I think it was the same wing on all of them with just slight variations in the logs to make a high wing or low wing. Those were fine for going round and round but that was about it.

John