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Ken
03-06-2006, 02:39 PM
Picture one is the profile of a 42/37, picture two is the PSI helix. I squared the cardboard to the 42/37 on a flat surface and traced the profile and then I squared the cardboard to the PSI.
racer7x
03-06-2006, 06:10 PM
Look the same to me......
Lewis
03-13-2006, 05:36 PM
I can see a slight difference, I have no idea what the different angles are talking about, but I can definatly see a discrepency between the two.
Thanks for the pics Ken, again you are a stockpile of information :)
Lewis
Ken
03-17-2006, 06:44 AM
I can see a slight difference, I have no idea what the different angles are talking about, but I can definatly see a discrepency between the two.
Thanks for the pics Ken, again you are a stockpile of information :)
Lewis

The slight difference that you are seeing is just the difference in the camera angle. If the helix angle was different it would be very noticable. The psi is supposed to be a 47/39.