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lund 1850 impact prop "blow out" - Page 3 - Walleye Message Central
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  #21  
Old 04-27-2019, 03:18 PM
JSB JSB is offline
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https://bobsmachine.com/product/blow-out-ring/

Has anyone tried one of these instead of the crappy plastic ones?
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  #22  
Old 04-27-2019, 08:21 PM
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Lund1875# Lund1875# is offline
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You need a 19p tempest prop. Problem solved, and fix the plastic thing. 49 mph on an 1875 Impact. Loaded.or not, if it's fairly calm, 49 mph, but more important.....no blow out on turns.
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  #23  
Old 04-27-2019, 08:47 PM
Northwoodswalleye Northwoodswalleye is offline
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I had the identical boat and motor. Ran a 20p bravo FS with motor lifted to hole 4. Zero blowout, handled and turned fantastic and would touch 50mph when empty.
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  #24  
Old 04-28-2019, 10:52 AM
staylor staylor is offline
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Quote:
Originally Posted by JSB View Post
https://bobsmachine.com/product/blow-out-ring/

Has anyone tried one of these instead of the crappy plastic ones?
Unfortunately the Bob’s blow out ring is for the Merc 2S gearcases for the 2.5/2.4L motors and will not fit the current Merc 4S gearcases. It has a somewhat different use than the plastic ring Merc uses. On the Merc 2S 2.5/2.4 cases when you run a hubless “chopper” style prop the Bob’s ring does help a bit with blowout at high speeds- 65mph and up. I used to run one a similar style ring on a 21 ft Checkmate performance hull with a 225 Evinrude looper motor. It did help a bit on planing off and allowed the prop to stay hooked up better at 70+ mph.

The OP’s problem is sadly becoming fairly common as more and more rigs are running the Merc 150 4S with the cheap plastic ring. When the ring fails it can just disappear when it pops out if a prop blade catches it, or it can jam on the forward section of the prop hub and just sit there looking like the factory put it on. In my case running the small hub Trophy Plus props the ring retaining tabs melt- and when one tab fails the ring comes out and rattles around on the small Trophy Plus hub. So far Merc seems content to just continue making this junk design and hoping that no one notices- sort of like when they were selling the infamous 3L “Opti-Pop” motors back in the early 2000s......
Doug
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  #25  
Old 04-28-2019, 01:30 PM
staylor staylor is offline
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Prop Blowout to the extreme causes a near instantaneous loss of forward thrust from the prop. There is a scary video of what can happen that comes up if you Google search: Bass Boat Veloster 400R 102mph

In this case, the owner was running a Merc V-Rod 400R which has a fairly “fat” gearcase and the popular opinion is that the “fat” gearcase coupled with a prop of a diameter that was designed to work with smaller gearcases left the rig prone to blowout at maximum jack plate height. The boat occupants are very lucky to still be among the living.
Doug
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  #26  
Old 04-28-2019, 03:02 PM
DW DW is offline
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You referred to the ‘stock prop’. There is no such thing. A dealer put a prop on which may have been based on a guess, or based on unwanted inventory. I think you classify as a prop novice. As others suggest you should educate yourself on prop design and characteristics, and test alternate props before you do much. Getting the motor height is the first step.
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