02-08-2015, 05:21 PM #1
Can someone explain how this happens
I went out riding today and i was just cruising for the most part with a buddy of mine, and on the way back to the ramp we played around a little, the first pull felt good and stong, the last pull we did i felt a strange vibration at ~8000+ rpm and immediately shut it down as i thought the flywheel bolts were letting go. i just cruised on back to the boat ramp and everything felt ok at 40 mph or so. Curiosity got the better of me so i yanked the pump out and my prop was REALLY hard to turn by hand, so i took it out to find this:
I managed to bust 2 out of the 4 blades. Im guessing at some point today i sucked something up and wounded the prop, and the last pull finished it off?
02-08-2015, 05:37 PM #2
Something got stuck between the trailing edge of the prop and the pump vanes.
Is that a untouched prop or been tweaked? My reason for asking is if too much trailing edge, it can compromise a sand cast prop as these are.
02-08-2015, 05:41 PM #3
I have pitched this prop quite a bit, it's a 15/19 and I have pitched it to a 14/23 I was thinking something got between the prop or I weakend the prop by pitching it too much. The wear ring is destroyed
02-08-2015, 05:51 PM #4
NICE! your lucky that blade didnt let go.... i had a 14/19 that was pitched alot.. back when.. it got weak and youd pitch it run it a few times and realize your rpm has changed... check the blade and it bent back.... the more you bend the weaker it gets IMO.. your lucky...
this is why i recommended a strong prop... i still think your over spinning that 14/19 or whatever blade that is past its capability... you need a 15/20 or 22 and pitch from there
02-08-2015, 06:01 PM #5
Cheap ass castings.
02-08-2015, 06:01 PM #6
- Join Date
- Jun 2010
- Milwaukee WI
It has been seen before with Solas props.
02-08-2015, 06:09 PM #7
Unless things have changed:
Solas = sand casting
Skat-Trak = investment casting
I've tweaked many Skat-Trak props over the years and have never seen a failure (even though they are thinner).
I'm not saying to buy Skat, just be aware if a sand cast part is repeatedly adjusted, it will compromise the structure. Add to this an object getting stuck in pump hitting the blade and you have a recipe for failure.
02-08-2015, 06:23 PM #8
02-08-2015, 06:45 PM #9
From the marks on it... it looks like it was pitched - bent way to close to the hub.
02-08-2015, 07:06 PM #10
My guess is that from the marks on the blade, you bent just the back edge and not the whole blade???
I have seen this many of times with Yamaha props in the race skis....
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