Emerald Sea Refit

emeraldsea · 30-01-2008, 19:16

Took my Wheel to the machine shop, they can tune up the pitch no-problem,...the question is how much? The previous YSE12G had a continuous Hp of 10 turning the shaft 986 rpm with engine @ 3000rpm.
The wheel is 16'' 3 blade 12'' pitch now, looks like it was originally 14'' pitch. New engine has max continuous Hp of 38, with 2.15 gear ratio.
Boat is heavy 13 ton, I'll have alot more shaft rpm, so I'm thinking 14'' pitch might be fine, I could go 16 if I want. Does anyone know a math formula that can answer this question? Could try 14, then move up if needed, but it would be nice (and cheaper) to get it right the first time.

DeepFrz · 30-01-2008, 19:43

Check this out

Propeller Calculator / Prop Calculator

emeraldsea · 30-01-2008, 20:52

Thanks for that, not sure what my prop slip would be? but if I put in .55 as a high, I have lots of wind and 2-4 knot currents are average here, that computes to 13.45 pitch to push my boat hull speed@ 3000rpm. THis leads me to guess that 12 might be fine but 14 might be best.

emeraldsea · 05-06-2008, 08:19

Updating progress-well she's back in the water but not running yet. New Alum. cheeks & cockpit floor.

emeraldsea · 05-06-2008, 08:29

After getting the lead out, and epoxy/painting the space, it is ready for the new power....or so I thought....!! Bell housing is about an inch too wide! Today I will be making some noise & dust with the concrete saw.

Alan Wheeler · 05-06-2008, 13:54

What an awesome transformation. Well done.

30-01-2008, 19:16	#1
emeraldsea Registered User Join Date: Feb 2007 Posts: 61 Images: 5	Emerald Sea Refit Took my Wheel to the machine shop, they can tune up the pitch no-problem,...the question is how much? The previous YSE12G had a continuous Hp of 10 turning the shaft 986 rpm with engine @ 3000rpm. The wheel is 16'' 3 blade 12'' pitch now, looks like it was originally 14'' pitch. New engine has max continuous Hp of 38, with 2.15 gear ratio. Boat is heavy 13 ton, I'll have alot more shaft rpm, so I'm thinking 14'' pitch might be fine, I could go 16 if I want. Does anyone know a math formula that can answer this question? Could try 14, then move up if needed, but it would be nice (and cheaper) to get it right the first time.

30-01-2008, 19:43	#2
DeepFrz Registered User Join Date: Mar 2006 Location: Winnipeg Boat: None at this time Posts: 744	Check this out Propeller Calculator / Prop Calculator __________________ The man who keeps faith with reality wants to act truthfully in the here and now, not to derive a secondhand here and now from a purpose. - Karl Jaspers

05-06-2008, 08:19	#4
emeraldsea Registered User Join Date: Feb 2007 Posts: 61 Images: 5	back in the water Updating progress-well she's back in the water but not running yet. New Alum. cheeks & cockpit floor. Attached Thumbnails

05-06-2008, 08:29	#5
emeraldsea Registered User Join Date: Feb 2007 Posts: 61 Images: 5	engine room After getting the lead out, and epoxy/painting the space, it is ready for the new power....or so I thought....!! Bell housing is about an inch too wide! Today I will be making some noise & dust with the concrete saw. Attached Thumbnails

05-06-2008, 13:54	#6
Alan Wheeler Registered User Join Date: Dec 2003 Location: Marlborough Sounds. New Zealand Boat: Hartley Tahitian 45ft. Leisure Lady Posts: 8,044 Images: 102	What an awesome transformation. Well done. __________________ Wheels For God so loved the world..........He didn't send a committee.

30-01-2008, 20:52	#3
emeraldsea Registered User Join Date: Feb 2007 Posts: 61 Images: 5	Thanks for that, not sure what my prop slip would be? but if I put in .55 as a high, I have lots of wind and 2-4 knot currents are average here, that computes to 13.45 pitch to push my boat hull speed@ 3000rpm. THis leads me to guess that 12 might be fine but 14 might be best.

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