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15 September 2006, 21:56
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#1
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Member
Country: UK - Channel Islands
Town: St Helier JERSEY
Boat name: Barney
Make: Scorpion
Length: 8m +
Engine: 350 Yamaha
Join Date: Dec 2005
Posts: 92
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Burning bushes at 60 knots+
Talking to a friend yesterday who drives a twin engined (evinrude 250s) Scorpion 8.75m rib. He says that they regularly burn bushes out, hitting rough water at 60 knots +.
Now I drive a meagre 225 Opti, and in 120 hours this season in a range of F1-F8 seas I've not blown a bush once, even after hitting pots, stray lines etc.. Is this a common experience or just crap driving from my friend?
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15 September 2006, 21:57
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#2
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RIBnet admin team
Country: UK - England
Town: The wilds of Wiltshire
Boat name: Dominator
Make: SR5.4
Length: 7m +
Engine: Yam 85
MMSI: 235055163
Join Date: Jul 2005
Posts: 13,069
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Do you mean prop bushes?
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15 September 2006, 22:46
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#3
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Member
Country: UK - England
Town: Devon
Boat name: White Ice
Make: Ranieri
Length: 5m +
Engine: Suzuki 115hp
Join Date: Jul 2002
Posts: 5,015
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I've heard that those 'rude 250's go through a lot of prop bushes.
I've taken out the bush on a Solas prop, but they also have a bit of a reputation.
No problems with my Yammie prop.
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15 September 2006, 23:17
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#4
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Member
Country: UK - Wales
Town: swansea
Boat name: Too Blue
Make: BLANK
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,791
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Quote:
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Originally Posted by FreeTrader
Talking to a friend yesterday who drives a twin engined (evinrude 250s) Scorpion 8.75m rib. He says that they regularly burn bushes out, hitting rough water at 60 knots +.
Now I drive a meagre 225 Opti, and in 120 hours this season in a range of F1-F8 seas I've not blown a bush once, even after hitting pots, stray lines etc.. Is this a common experience or just crap driving from my friend?
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Beats taking out the gearboxes though!!! Maybe they aren't tight enough - VFT is the setting to use on the torque wrench!!!
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15 September 2006, 23:54
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#5
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Member
Country: UK - England
Town: Bradford on Avon
Boat name: tbc
Make: Sunseeker (AshleyD)
Length: 8m +
Engine: 2 x coal burners
Join Date: May 2004
Posts: 461
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If the engines are Etecs running the standard props then I'm afraid that you can't blame your mates driving. We got through four bushes in less than 120 hours 
A switch to Renegade props should solve the problem 
Ian
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I miss the sound of an Etec in the morning
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16 September 2006, 09:26
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#6
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Member
Country: UK - England
Town: Exmouth, Devon
Length: no boat
Join Date: Oct 2004
Posts: 767
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Quote:
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Originally Posted by FreeTrader
Burning bushes at 60 knots
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I think these were two separate incidents in the Moses story. And I suspect they didn't get to 60 Knots through the Red Sea.
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16 September 2006, 09:42
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#7
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Member
Country: UK - England
Town: Devon
Boat name: White Ice
Make: Ranieri
Length: 5m +
Engine: Suzuki 115hp
Join Date: Jul 2002
Posts: 5,015
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Quote:
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Originally Posted by codprawn
Maybe they aren't tight enough - VFT is the setting to use on the torque wrench!!!
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No.
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16 September 2006, 13:41
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#8
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Member
Country: UK - Wales
Town: swansea
Boat name: Too Blue
Make: BLANK
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,791
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Quote:
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Originally Posted by Richard B
No.
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?????
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16 September 2006, 14:21
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#9
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Member
Country: UK - England
Town: Devon
Boat name: White Ice
Make: Ranieri
Length: 5m +
Engine: Suzuki 115hp
Join Date: Jul 2002
Posts: 5,015
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No, slipping prop bushes are nothing to do with the torque of the prop nut, or any nuts at all! The splined sleeve which is bolted to the shaft has nothing to do with the problem - it is slip between the outer surface of the rubber bush and the internal surface of the propeller hub. A propeller repairer who knows his stuff can fit a more heavy duty bush.
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16 September 2006, 20:50
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#10
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Member
Country: Ireland
Town: Dublin
Boat name: wizzard
Make: REDBAY
Length: 7m +
Engine: 225 optimax
Join Date: Sep 2002
Posts: 835
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The big opti bushes are a wedge shaped tube of plastic, they dont wear like the other type
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16 September 2006, 20:58
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#11
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Member
Country: Other
Town: San Carlos, Mexico
Boat name: INDE
Make: LOMAC 730
Length: 7m +
Engine: 200 Merc.
MMSI: Please press 1
Join Date: May 2006
Posts: 1,688
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Running around like a head with it's chicken cut off.
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16 September 2006, 23:58
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#12
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Member
Country: UK - Wales
Town: swansea
Boat name: Too Blue
Make: BLANK
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,791
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Quote:
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Originally Posted by Richard B
No, slipping prop bushes are nothing to do with the torque of the prop nut, or any nuts at all! The splined sleeve which is bolted to the shaft has nothing to do with the problem - it is slip between the outer surface of the rubber bush and the internal surface of the propeller hub. A propeller repairer who knows his stuff can fit a more heavy duty bush.
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I thought the tighter the nut the more the bush would expand to grip the prop - but looking at most of them the centre would stop it from crushing anyway.
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