To be perfectly honest with you I think the first Rev 1.5 vented (introduced in January 1996) with the horizontal venting was the best vented REV ever made by Revolution, in particular to the lower wind range.
John you are the man most likely to know. Why did Revolution shift from horizontal mesh panels on the vented kites to verticle mesh panels and when was it?
I seem to remember the old Rev 1.5 with horizontal mesh flying very well indeed, maybe it is time to revisit that solution.
They changed to the horizontal vent on the REV 1.5 when they came out with the SLE in January 1998.
Also in January 1996, Revolution introduced the REV I with a single vertical vent on each side which was replaced by a triangular vent the following year.
Do you remember me teaching you how to axel the REV 1.5 vented at Scheveningen in June 1996?