whats it like to race competitively on a 34X?
Upwind, the boat was a rocket. relatively bendy rig with running backstays provided lots of room to tune the sail-shape for the conditions, aided (at least in the 70s) with hydraulic headstay and backstay, so you could pump the whole rig forward in breezy conditions to balance the boat and reduce weather helm. The boat also LOVED having a double-head rig in close-reaching conditions: a big (160%?) "jib-top" (a high-clewed genoa), with a genoa-staysail set inside it to create a double-slot effect... super effective.
Offwind... yeah, the big spinnaker was fun (and, bloopers!), but, as with most IOR designs of the day, it had a very hard time getting out of its own wave-pattern. Boats of that era aren't designed to plane, so in breezy conditions they don't really get up and boogie, they just pull a big quarterwake along behind them. If there was a good swell, yes, you could get some momentary surfing action, but in southern California it was rare to get those kinds of conditions.
Back in the day (tm), there was a lot of "ton-class" racing in southern California (IOR half-tonners, 3/4-tonners, 1-tonners, 2-tonners...). The 34 was designed to be competitive in the 3/4-ton division, and did very well, even against custom boats. Raced a lot against Peterson-34s, a few Davidsons, even a hot little rocket from Brit Chance named "Eclipse", and the ericson did very well. Plus, much better "manners" than a lot of the more radical IOR designs of the day.
Fun boats.