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Bad Day on the Water

Old 11-25-2019, 08:53 PM
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Default Bad Day on the Water

Our lake was up pretty much all year from spring flooding. There is a lot of timber on the lake that you can normally see. The water is now coming down to normal levels and somebody at the lake found a stump that ate somebody’s prop earlier this year. Gotta slow down when that water is high!!!

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11-26-2019, 01:33 AM
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Somewhere, there is a dude laughing his arse off, thinking, "Wait 'till they find these 3 prop blades I hammered into this stump". "Someone will probably try and calculate the speed by the separation of the blades". Lol
Old 11-25-2019, 09:03 PM
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Broke off all three blades, wow! Put them on craigslist, maybe the owner will claim them. lol
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Old 11-25-2019, 09:09 PM
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That's a cool pic . Man ... the forces involved . Looks like cast metal which may have been good for the engine .
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Old 11-25-2019, 09:14 PM
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I wonder if you measured the distance those blades are separated and guestimated prop circumference if you could back out how fast the boat was going?

I bet they were turning some rpms though. I bet that lower unit didn’t survive.
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Old 11-25-2019, 09:17 PM
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(average distance, in inches, between the three blades x 3) x .9 = pitch

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Old 11-25-2019, 09:21 PM
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I like the way this threads going

Add " So how fast was this Boat going " in the thread title . There's a bunch of engineer's around here .
Old 11-25-2019, 09:33 PM
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It’ll probably stump most of em.
Old 11-25-2019, 09:44 PM
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Really bad day for the guy who hit this but what an awesome picture. That is amazing that all 3 blades are imbedded. Well unless they were running 4 blades and missed one!
Old 11-25-2019, 09:51 PM
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That’s just crazy
Old 11-25-2019, 10:44 PM
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Beautiful piece of artwork.
Old 11-26-2019, 01:33 AM
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Somewhere, there is a dude laughing his arse off, thinking, "Wait 'till they find these 3 prop blades I hammered into this stump". "Someone will probably try and calculate the speed by the separation of the blades". Lol
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Old 11-26-2019, 02:32 AM
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I thought the hub would have given way after the first or second blade sheared?
Old 11-26-2019, 02:59 AM
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Couple of years ago we helped a newby member launch their Bayliner at the local ramp first thing in the morning. Wife had no idea of how to back a trailer, (hubby was sitting in the boat).... anyway I offered to help and backed the rig down for then and helped them launch.

The 500m long channel into the ramp is very shallow at low tide with a rubble/rocky bottom..... which it was going to be mid afternoon... hold that thought.

Anyway, we came back in at about 3pm to find them stopped halfway along the channel unable to move, although the engine would rev in gear. Towed them back to the pontoon.

Got the guy to trim up the mercruiser leg and lo and behold, a prop hub and no blades, sheared off millimeters from the hub. No sign of the blades anywhere!

Story goes that they came back ito the channel behind a larger vessel and slowed down to that “just off the plane” speed where the Engine is working hard and the stern digs down deep. Hit bottom hard with the engine and that’s all she wrote.

Old 11-26-2019, 04:05 AM
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Originally Posted by Tom W Clark View Post
(average distance, in inches, between the three blades x 3) x .9 = pitch

I thought it looked like a pitch pine stump!

Cool picture.
Old 11-26-2019, 04:20 AM
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Originally Posted by jbacc View Post
I thought the hub would have given way after the first or second blade sheared?
pretty much...it doesnt take an engineer to figure the reduction of speed and power on the first strike would prevent the 2nd and third blades from penetrating the same distance...if at all...not to mention deflection and a host of other resulting forces...
Old 11-26-2019, 04:33 AM
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Originally Posted by bladenbullet View Post
pretty much...it doesnt take an engineer to figure the reduction of speed and power on the first strike would prevent the 2nd and third blades from penetrating the same distance...if at all...not to mention deflection and a host of other resulting forces...
So, you are calling "photo shop"?
Old 11-26-2019, 04:40 AM
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I trust you took your chainsaw out for a boat ride and claimed your prize artwork?
Old 11-26-2019, 04:43 AM
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Originally Posted by bladenbullet View Post
pretty much...it doesnt take an engineer to figure the reduction of speed and power on the first strike would prevent the 2nd and third blades from penetrating the same distance...if at all...not to mention deflection and a host of other resulting forces...
unless it was a deisel.
Old 11-26-2019, 07:09 AM
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Those prop blades look well used to me. I wonder if corrosion played into any weakness within the blade causing them to shear easier.
Old 11-26-2019, 08:40 AM
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...it doesn't take an engineer to figure the reduction of speed and power on the first strike would prevent the 2nd and third blades from penetrating the same distance...if at all...
Look at the photo closely. That is exactly what we see there, each blade is progressively less imbedded in the stump.

Doesn’t take much to snap an aluminum blade off of an outboard prop.
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