Looks like a 3-plank rudder there! Wonder if it's original?
Does indeed look good, except for 'incidentals' on the bottom edge.
Third plank out might have been attached with lags.
Copper (pink) color on a supposed bronze (gold) shaft would not be a good sign.
It would mean the alloy was high zinc and the zinc has leached leaving a porous copper behind. Leaching is INTERNAL alloy galvanic action. Does not require anothedissimular alloy nearby. In the case of a copper alloy - too much zinc for salt water immersion.
If you get serious about making a new rudder, I strongly suggest you go with silicon bronze. So you can keep the alloys in the rudder all the same. High zinc manganese bronze should NOT be used underwater. Nor stainless. I think this is beyond 'my opinion'.
Prepare for a nosebleed on the price!!! ($53.31 a foot +s&h for 1" S.B. rod from Onlinemetals)
Impressive action there!
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Getting bronze for a boat is a big problem these days. Nearly all marine sources are orientated to stainless steel. Silicon rod is still available usually, along with a range of fasteners from SOME marine catalogers. S.B. sheet and bar is impossible to find in small quantity off-the-street sales. As the woodenboat forum says: you have to find fabricators in your area. They may have left-overs from a job because they too have to order 'minimum quantities'.
Here are three non-ferrous suppliers that show phone numbers on their net pages, it may be a friendly sign.
Rancocas Metals in New Jersey - 800-762-6382
Atlas Metals in Denver - 800-662-0143
Busby Metals Hauppauge NY 800-552-8729. / 631-434-3400 (sometimes get better action with a local number)
There is no indication from woodenboat forum experience that these suppliers with internet sites will send you a 1 foot piece of bronze in the mail.
BUT TRY Phil at Metal Service Center*, 7743 Bell Rd, Windsor CA, 707-838-8088. The estate metal and wood shop here where I work buys small quantitys and custom pieces of all kinds of metals constantly from them. No problem. Maybe they UPS. Remember you are in the boat repair business.
* from whom I ordered my original Everdur from. I got NO break in the price. (gold)
One metal fabricator in my area is Lux Metals in Santa Rosa CA. They, or actually Dean, welded my silicon bronze rudder shaft and strap armature together. Beautiful piece of work. (platinum)
They never returned to me some S.B. sheet I had to quantity buy for the job.
I mention these to show that every metro area has some sort of access to specialty materials.
Always E X P E N S I V E .