I was surprised at the loads, and have no idea why there is a difference to the various load calculators and postings.
Windburn has ARCO 40s as the primary winches. They are similar to the new offerings with a 6.3:1 second gear ratio and a 3.25" drum diameter. http://www.arco-winches.com/products/winch/stdi With a 10" winch handle the power ratio would be 10 x 6.3 / 1.625 = 38.8 Am I correct in extrapolating that with 50 lbs force on the handle there would be about 2000 lbs force on the line? At high winds and full load my best guess is I am developing over 100 lbs of force on the winch handle, hence my guess at 4000 lbs. My headsail is in the 300 sq ft range and even at 15 knots the load on the winch handle is well over 20 lbs. I don't know what the discrepancies are. I originally used calculators to come up with a load rating and spec'd the rigging to match. We wore out the turning block in the first year. The 3/8" standard doublebraid sheet failed at the clew, though we were pounding into high wind and waves for hours. I upgraded to New England VPC 3/8, good for 6000 lbs, and broke the core where it turns on the genoa lead car. >From the Harken site a 300 sq ft sail at 8 knots would have a 83 pound load. I have no problem pulling 83 pounds and there is no way I can fully pull in my #1 by hand at 8 knots. If I really got my back into it and pulled as hard as I could I might get well over 200 pounds, good for 13 knots on the Harken site. There is no possibility of me trimming the jib by hand at 13 knots. Am I getting something wrong? Michael Brown Windburn C&C 30-1 From: "Dennis C." <capt...@gmail.com> 300 sq. ft of headsail at 20 knots true is about 520 pounds load. https://www.harken.com/content.aspx?id=9096 Dennis C. Touche' 35-1 #83 Mandeville, LA On Fri, Nov 9, 2018 at 7:08 PM bwhitmore via CnC-List <cnc-list@cnc-list.com> wrote: > 4000 lbs of load on a 30 ft. C&C? On what do you base this? > > Sorry if I seem incredulous... > Date: Fri, 9 Nov 2018 22:46:23 -0500 From: "Matthew L. Wolford" <wolf...@erie.net> That didn?t sound right to me, either. From: bwhitmore via CnC-List Sent: Friday, November 09, 2018 8:07 PM 4000 lbs of load on a 30 ft. C&C? On what do you base this? Sorry if I seem incredulous...
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