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Post by gtightline on Jun 20, 2015 7:03:44 GMT -6
Thanks Juan...I'll try that, maybe Photo Bucket or something like that.
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Post by Juan on Jun 20, 2015 7:05:33 GMT -6
Photobucket:  |
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Post by gtightline on Jun 20, 2015 7:07:24 GMT -6
Nice...I'll try it next time...Thanks..
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Post by gnrphil on Jun 20, 2015 7:15:00 GMT -6
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Post by gnrphil on Jun 22, 2015 10:35:40 GMT -6
Update. Received a new prop as recommended by Ken at Prop Gods. 14.5X17 powetech , 5400 rpm @ 40 mph. 16% slip , tired of this now so back to the 15 pitch and leave it alone I think.
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Post by gnrphil on Jun 23, 2015 6:58:08 GMT -6
I'd say I'm about an inch under the water with the AV plate, I talked with propgods yesterday per E Mail I expect he'll get back with me today. I think the extra half inch diameter has had a big effect on performance.
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Post by freezerfiller on Jun 24, 2015 6:04:40 GMT -6
Wow, that's a big difference. I'd go back to where you were too.
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Post by freezerfiller on Jun 24, 2015 11:20:58 GMT -6
Interesting, I decided to calculate my slip from the best days performance to see where I was. 16%. Running almost the identical prop 14-3/4 X 17p.
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Post by gnrphil on Jun 24, 2015 11:37:33 GMT -6
I was truly amazed that this prop had so much slip, I expected some but with a little performance increase. Between 5000 and 5500 rpm I saw a 2mph gain in speed, that's just pointless.
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Post by Juan on Jun 24, 2015 17:26:55 GMT -6
I was truly amazed that this prop had so much slip, I expected some but with a little performance increase. Between 5000 and 5500 rpm I saw a 2mph gain in speed, that's just pointless. No, a broken pencil is pointless....that's a waste of money  |
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Post by gnrphil on Jun 24, 2015 17:54:56 GMT -6
It's going back for a refund so all is not lost and the Admiral is happier :-)
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Post by seagristle on Jun 30, 2015 9:25:09 GMT -6
What kind of hoist or jack are you guys using when you are raising or lowering your engine position? Outboards are pretty damn heavy!
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Post by seagristle on Jun 30, 2015 9:39:33 GMT -6
That's a neat idea using the trailer jack. Thanks!
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Post by gnrphil on Jun 30, 2015 10:24:23 GMT -6
Quick update on the prop part of this thread. As I said the 17 pitch didn't improve things, I took a close look at the 15 pitch prop and found it's a Stihletto advantage prop. I've learned that these props generally perform like a prop with 1" to 2" more in pitch, so this 15 is working like a 16 or 17 pitch. It all makes sense now that the 17 pitch I bought didn't change anything.
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Post by acdaddy0 on Jul 16, 2015 16:27:16 GMT -6
Zero slip will equal zero movement.
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Post by gnrphil on Jul 16, 2015 17:08:55 GMT -6
Another way to look at slip is it is a percentage of in efficiency, a 15" pitch prop should move you 15" forward per revolution therefore with a 10% slip you would only move you 13.5". The less slip the more efficient. Think of it as traction.
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