Bronze WhiteWater Oar Locks; OregonTM Bronze Locks
Type A; 17mm x 75mm Long Shaft (SI International Standard)
Alloy Si- Bronze CDN 876, Suitable for WhiteWater and Saltwaer
100% Made in USA
Fits: 17mm ID Bushings (drill 5/8" Bushings to 17mm or 11/16")
Appurtenance: 25mm Long 2mm wire size comp. springs
We Offer You The Best Si-Bronze WhiteWater OarLock In North America.
Compare To The Corporate Big Boys For A 40% Savings: $35/ea
Dimensions Link: http://rowframe.com/engineerdataraftframes.html
pro·pri·e·tar·y (prə-prī′ĭ-tĕr′ē)
A great word for folks that want to bung your doo. The word implies ownership. Ownership may be of a design, a process, or some other brand of intellectual property. The intent is to dissuade others from coping the process /design/property thus reserving it for themselves. I consider this to be a Ferengi style of acquisition. After all, if one has property, you protect it the old fashioned way; you patent it or copyright it. Failure to patent and copyright leaves the property open to commerce thus benefiting all of society.
Copying a good design is both complementary and flattery. Copying a poor design is stupidity or ignorance. Ignorance is solved via education; hence this post. Ask not the logic of alloying bronze with manganese, zinc, lead and car bumpers; but removing such and replacing with copper and silica. There are no better alloys for oarlocks than si-bronze. Folks that insinuate otherwise relish in your ignorance.
A counter argument is strength. Strength is a parameter defined by envelope of stress and strain such that zero permanent strain is achieved when a load is relaxed. If the argument is strength, than there is no better way of achieving strength than enhancing a component’s geometry. And, if the argument is strength, there is no better way than nesting an oarlock’s shaft in a Morse taper. Some say nay to this proposition. Others say graphite.
Zinc Bronze, aka Brass, have no business in OarLocks other than making them cheap. That's why the Chinese pioneered the alloys. Some say look at the strength. Yeah, but it dissolves in sea water. Perceived value from strength is a fool’s game. Know it for what it is.
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Table of Strength Ratios Based on Yield and Section Modulus
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SI(unit)
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Dec (ins)
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I(in^4)
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c=___(ins)
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S(in^3)
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%increase
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5/8
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n/a
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0.625
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0.00749
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0.31250
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0.023968
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Baseline=1
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16
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mm
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0.630
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0.00773
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0.31496
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0.024551
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2.43%
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17
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mm
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0.669
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0.00983
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0.33465
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0.029383
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22.59%
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18
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mm
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0.709
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0.01240
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0.35433
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0.035006
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46.05%
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Retrofitting Brand Z Oar Towers
Brand N, Brand Z…Whatever. Purchase 17mm drill and Drill / Ream new bearing journal. While you’re at it, install a grease zirk, see McMaster Carr for thread size options. Worried about tolerances? The S folks can even hold 30 thousands, let alone bearing tolerances.
