#397437 - 12/17/07 08:43 PM
Re: UHMW Jet pump shoe?
[Re: ]
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Smolt
Registered: 02/26/01
Posts: 79
Loc: Oregon
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Never used an UHMW shoe, but I wonder if they really do all that is advertised.
I always thought shoes were more or less designed to break on impact. I'm no physics major, but it seems like if the shoe doesn't break on impact, something else will give instead. Like damage the case bolts, or jar something else in the pump housing.
I blew up a shoe on the copper my first summer up in AK on a hastily planned alt. trip at a time when it was so low you could hardly drag a raft down it, and I hit hard. The impact occured on a slide from a 90+ degree turn along a cliff with a rock outcropping. It knocked a gash in the port-side back/bottom edge and kicked the yami up so hard it knocked the cowling off. It cracked the shoe right down the middle on the port and starboard sides all the way up to the flange, but the impeller and pump housing was fine. As a result, it fired right back up and got us back up the crick at the end of the day. A new shoe and it has ran like a top for the last two seasons with all the same internals. While i clearly was lucky, I also think that the shoe splitting is what protected the rest of the motor.
I wonder if the result would have been any better/worse with a 'indestrucible' shoe. I can see how guys might not like the way their shoe or grate looks from normal wear, like ticking rocks in downstream shallows, so in those situations I can see how a UHMW shoe would seem more durable for that kind of wear. But in the event you hit a dead head or just plain whack something connected to china, I wonder if the result would actually be any better. Probably not much of a concern if you are always running the same water, but more so if you run a lot of different rivers.
Dom
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#397448 - 12/17/07 09:23 PM
Re: UHMW Jet pump shoe?
[Re: NWaddict]
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Fish Fear Me
Registered: 10/12/05
Posts: 3275
Loc: Port Angeles
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I only wiped out one foot on my boat this last summer...  f'n sleeper underwater mountain in 20' of water that no one had seen before...  Somehow I don't think any amount of UHMW would have saved me on that one...  I had the boat turned at about 45 degrees wide open spinning around in a HUGE "wide open" pool just immediately downstream of the lake, and hit it so f'n hard it just immediately stopped the boat.. thank god no one was hurt... It slowly got me back to the lodge, and all we had to swap out was the foot portion itself, as the impeller, pump, and everything else was fine....
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#397449 - 12/17/07 09:36 PM
Re: UHMW Jet pump shoe?
[Re: TBird]
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It all boils down to this - I'm right, everyone else is wrong, and anyone who disputes this is clearly a dumbfuck.
Registered: 03/07/99
Posts: 16958
Loc: SE Olympia, WA
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I think if you looked at the physics of a collision between a pump shoe and a rock/log/etc, you'd find that the shoe material would change the forces applied to the rest of the motor during a collision very little. Typically, there just isn't a lot of compression and deformation of material during a collision to absorb and dissipate the forces applied to the motor. If the metal shoe didn't break, but compressed and deformed when a UHMW shoe wouldn't, then it should make a difference.
*Disclaimer: Dan S. is no physicist. He has no degree in physics or any closely related field. His opinion should only be taken as gospel if you're really dumb and/or gullible.
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She was standin' alone over by the juke box, like she'd something to sell. I said "baby, what's the goin' price?" She told me to go to hell.
Bon Scott - Shot Down in Flames
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#397570 - 12/18/07 11:01 AM
Re: UHMW Jet pump shoe?
[Re: Sol]
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Fish Fear Me
Registered: 10/12/05
Posts: 3275
Loc: Port Angeles
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So that's what pixies are used for! Good to know! 
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 So easy, a cavegirl could do me Team FTW
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#397961 - 12/19/07 04:18 PM
Re: UHMW Jet pump shoe?
[Re: OPfisher]
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Smolt
Registered: 02/26/01
Posts: 79
Loc: Oregon
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That video is crazy. In some of that stuff it looked like they were going out of their way to run over stuff. Wow.
Dom
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#397963 - 12/19/07 04:20 PM
Re: UHMW Jet pump shoe?
[Re: NWaddict]
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River Nutrients
Registered: 12/19/03
Posts: 7477
Loc: Poulsbo
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