If you look closely at your second photo, you will see that the skis were on a Bensen B-16 gyro.
That was his twin-engine machine where the port engine is mounted a few inches or cm's forward of the stbd. one and the props overlap. See the first photo.
The second photo shows it on skis.
BTW, I found these photos on the PRA Magazine dated October, 1981 on the PRA website where Members have access to over a hundred of them! (I'm #5392).