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TOPIC: Nooooo! New prop no fit!

Nooooo! New prop no fit! 25 Aug 2019 18:53 #98571

Maybe to hot of a spark plug? I was losing all power running WOT, switched plugs and have not had any issues again.
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Mercury Marc, 1958 Hawk II. 1961 Merc 400

Nooooo! New prop no fit! 25 Aug 2019 18:31 #98569

Sounds like a fuel problem from the little bit of symptoms given, it sounds more like trash in the carb or lines if it still had a firm bulb after dying.
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Ray

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1956 Vagabond I - 50 HP Johnson
1950 Flyer - 50 HP Evinrude
1/2-195something Flash - KG7
1956 Golden Rocket, Sawzall Special
Last edit: by Locomotion.

Nooooo! New prop no fit! 25 Aug 2019 17:29 #98568

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Locomotion wrote: You are not getting good info from your tach or the props are not what they are represented to be, a 1,500+ RPM drop for a 1" pitch change does not add up.


Maybe the 12.5 inch pitch prop is slipping?

Seems it would self destruct after a while.

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“I would rather have questions that can't be answered, than answers that can't be questioned.” - Richard P. Feynman

Nooooo! New prop no fit! 25 Aug 2019 14:46 #98567

Locomotion wrote: You are not getting good info from your tach or the props are not what they are represented to be, a 1,500+ RPM drop for a 1" pitch change does not add up.

I completely agree! And to add to the confusion, boat starts and runs just fine this morning? I wish I'd done a little more testing when it wasn't running.
Sound like a weak fuel pump or vacuum in the tank maybe?
As soon as we had it on the trailer I squeeze the primer bulb and it seems tight which just left me with unanswered questions.

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Sean

Nooooo! New prop no fit! 25 Aug 2019 14:01 #98566

You are not getting good info from your tach or the props are not what they are represented to be, a 1,500+ RPM drop for a 1" pitch change does not add up.
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Ray

"Every man takes the limits of his own field of vision for the limits of the world."
Arthur Schopenhauer

1956 Vagabond I - 50 HP Johnson
1950 Flyer - 50 HP Evinrude
1/2-195something Flash - KG7
1956 Golden Rocket, Sawzall Special

Nooooo! New prop no fit! 25 Aug 2019 03:37 #98557

Tapping this old thread seems as good a place to put this as any...
Installed my Amazon Tach on my 64 Evinrude 40 horse behind my Ranger 3 and went testing. Picking a number in the middle of the range that the tach is jumping from... the results:
12.5p 23.7mph at 5950 rpm (saw readings as high as 6200 rpm)
13.5p 24.5mph at 4400. My book says Max Wot is 4500 so I'm having trouble believing we sifer'd the first reading correctly, altho I have no over rev protection in place.
On a lighter note: I wake boarded (wakeless) and skied quite a bit, nice to finally try my antique skies, I even wore a life belt for the occasion lol. After 2 hours of this, Miss Blossom lost power over 2 minutes then died 30yards from our launch. I have no idea what's wrong as I was ski'n and couldn't hear. Lisa reports smooth sounding just continued lost of power... plugs looked fine. Will hit that in 6 hours, look forward to any input from the wise ones. Good Night Friends.

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Sean
Last edit: by SeanDrives4Fun.

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

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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Mercury Marc, 1958 Hawk II. 1961 Merc 400
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.
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