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TOPIC: Nooooo! New prop no fit!

Nooooo! New prop no fit! 13 Aug 2019 02:17 #98264

Well... we got a break!
Lisa found a like new 11.5p factory prop
We've been running it all week it still 25mph but a tad more launch...

The break came tonight when while pulling into my normal lagoon to play fetch with my dogs, I hit something submerged very solid......

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Sean

Nooooo! New prop no fit! 21 Jul 2019 23:47 #97615

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BTW, I have a book "Propeller Handbook" by Dave Gerr. I think it's considered by many to be the bible of propeller design & application. Way more information than I was ready for... I'm basically done with it, and will gladly loan or sell it to anyone interested. I'll bring it to the next Arrowhead in case anyone is interested.[/quote]
"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""'
Jeff I have been looking at that book, I will buy it off of you at AH if you have not sold it yet?

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Last edit: by HawkEyes.

Nooooo! New prop no fit! 21 Jul 2019 21:58 #97614

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jmhyatt wrote: I believe that is a good illustration of a difference in "rake", correct? The pitch of the two props could be the same, but the rake appears different.

I did some tests measuring the RPM/speed of the factory prop that came on my Suzuki motor. I measured a very low "prop slip", like 4%. I bought a stainless prop and took it to a prop guy to ask about cupping it. I told him I had measured 4% slip on the factory prop (aluminum), and about 10% slip on my new stainless prop. He said "No way you're getting 4% slip on the factory prop." He measured it with a protractor-thingy, and my 11-pitch factory prop (as marked) measured as 12-pitch. The new stainless prop was pitched as marked. He measured the pitch & rake of both props for me. Pitch angle is measured tangential to the prop circle, while rake angle is measured radial to the prop circle. I think...

BTW, I have a book "Propeller Handbook" by Dave Gerr. I think it's considered by many to be the bible of propeller design & application. Way more information than I was ready for... I'm basically done with it, and will gladly loan or sell it to anyone interested. I'll bring it to the next Arrowhead in case anyone is interested.



&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&

Good book.

Gerr's 'The Nature of Boats' is a good read, too.

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Last edit: by VinTin.

Nooooo! New prop no fit! 21 Jul 2019 18:08 #97611

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I believe that is a good illustration of a difference in "rake", correct? The pitch of the two props could be the same, but the rake appears different.

I did some tests measuring the RPM/speed of the factory prop that came on my Suzuki motor. I measured a very low "prop slip", like 4%. I bought a stainless prop and took it to a prop guy to ask about cupping it. I told him I had measured 4% slip on the factory prop (aluminum), and about 10% slip on my new stainless prop. He said "No way you're getting 4% slip on the factory prop." He measured it with a protractor-thingy, and my 11-pitch factory prop (as marked) measured as 12-pitch. The new stainless prop was pitched as marked. He measured the pitch & rake of both props for me. Pitch angle is measured tangential to the prop circle, while rake angle is measured radial to the prop circle. I think...

BTW, I have a book "Propeller Handbook" by Dave Gerr. I think it's considered by many to be the bible of propeller design & application. Way more information than I was ready for... I'm basically done with it, and will gladly loan or sell it to anyone interested. I'll bring it to the next Arrowhead in case anyone is interested.
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Last edit: by jmhyatt.

Nooooo! New prop no fit! 21 Jul 2019 13:31 #97600

rushwal wrote: Those props look different... do they have the same number stamped on them?




Those props do look to be different other than the bushing location, it looks like the blades are taller on the new prop.

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Ray

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Nooooo! New prop no fit! 21 Jul 2019 06:00 #97594

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Those props look different... do they have the same number stamped on them?

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Nooooo! New prop no fit! 21 Jul 2019 04:45 #97591

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I've run into that.

I've got some 1/2 inch bolts and washers and can pull that hub either direction.

It 'remembers' some so it may have to be done a couple of times.

It take both props to the shop and show them what you need.
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Nooooo! New prop no fit! 21 Jul 2019 01:43 #97581

"Old" G-13 vs my "new G-13
You can see why I'm having issues hitting the exhaust port.

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Sean

Nooooo! New prop no fit! 20 Jul 2019 14:41 #97567

I may have put this in the Press and gave it a little love, since it's brand-new and returnable I didn't try hard enough to be successful...

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Sean

Nooooo! New prop no fit! 20 Jul 2019 14:14 #97560

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SeanDrives4Fun wrote: Odd thing is, I test drove a G-13 two days ago?


I don't think the dog really cares :biggrin:
good luck, you will figure it out, sorry I am of no help.
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