'mkfs(1m)' for RA81s - gap?

[#G.SEUBERT]

Several sources have come up with varying opinions about the optimal
Gap Size and Blocks/cylinder for DECs RA81 drives. We're under the
assumption of 728 Blocks per cylinder (14 R/W heads x 52 sectors/track).

If 728 is correct, what should the proper gap size be considering
3600 RPM?

Thanks in advance.

Gary Seubert - HOCC
[..ihnp4!]houxm!garys

(running System V if it makes a difference)