John, before your time it was even narrower, hands were nearly
touching
in some shells. The reasoning was to gain more leverage on the
drive.
I don't have a good answer, but do have a couple observations.
1. Until tulip blades, finishes were taught to be very flat with no
vertical motion. The blades were very narrow and one could
maintain blade depth without burying as much shaft. With narrow
grip, the inside hand has less room for vertical movement and feather,
the sternum is right there.
2. related to 1, we used less track and a lot more layback in
general, something like 26" tracks I think I recall. With more
extreme layback, the outside hand comes to the sternum and
there is thus more room for the inside hand.
3. feathering was more passive than active. Talking to my friends
who rowed for Oly teams in the 50s, they talk about stopping the
hands briefly at the finish to let the bent oar/blade uncoil and
release
the rest of it's energy as you began the feather, and that the
oar would 'feather itself'. Claim: much more relaxing.
I've watched film of Olys/colleges previous to 1960. There was a
wide variety of hand spreads, some grips as wide as now, but
these days I never see narrow grips.
I went for a row in a pair with one of these guys many years
ago. I frankly expected to feel something really magical and
smooth, I was all prepared to try to row their style, see what
it felt like.
It felt like a tug-a-war contest in a phone booth. i was
disappointed,
could have done that with a novice knucklehead!