A very pleasant little swim - only had time for about 35 minutes in the water, but was thinking hard about this fly business...
Along these lines, not sure if this was it exactly:
Flip turns on all free!
3 x 50 stroke (back, breast, fly drill-swim)
3 x 50 kick with board (flutter, whip, dolphin)
Dolphin kick experiments without board:
2 x 50 dolphin kick on back
2 x 50 dolphin kick on back with double-arm back pull every 5th kick
50 full fly
2 x 50 dolphin kick on front with breast pull every 5th kick
2 x 25 fly
2 x 100 free (10 seconds rest): first one build by 25, second one strong
1100 yards total