Talk about seat of your pants!
Jay do you have any other pics of RAJO Jacks racer. I am acquiring parts to build a bob tail along the same lines as this or Noel Bullocks racer from 1922.
Here's two more pictures:
All three from Don Radbruch's book, "Dirt Track Auto Racing", pages 11 & 12, I think.
Note it's built offset on the axles since it was raced on tracks with only LH turns
There was a poster here a few years ago who built a racer with inspiration from Rajo Jack's first racer - Jason:
Looking further at Rajo Jack's spring setup.. looks like he didn't have any spring shackles, that would mean something had to give when the axles moved up and down - likely the springs, but also the radius rods and perch bolts in the front - no good idea for a road driven speedster. But there are ways to make it work without putting high strain on the components..
I wonder if Jason has finished his racer?