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06 November 2012, 18:10
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#1
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Member
Join Date: Nov 2012
Posts: 8
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parsun. cavitation
My friend has purchased a 4 meter. Chinese type quicksilver rib and a. Parun 9.8 hp 4stroke motr. With 2 on board the rib won't plane but just sits up with lots of cavitation. Is the set up wrong or is the motor not man enough for the job
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06 November 2012, 18:16
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#2
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Member
Country: UK - England
Town: Mighty Penryn
Boat name: Little Joe.
Make: Avon Searider
Length: 4m +
Engine: Honda BF50
Join Date: Aug 2005
Posts: 8,872
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Quote:
Originally Posted by martin.aveyard
My friend has purchased a 4 meter. Chinese type quicksilver rib and a. Parsnip 9.8 hp 4stroke motr.
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What the hell was he thinking?!!  
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06 November 2012, 18:21
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#3
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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: 13,054
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Quote:
Originally Posted by Mollers
What the hell was he thinking?!! |
Well, it IS coming up Christmas. Maybe he was after something to mix the egg nog in.
Seriously though, I'm not surprised a 9.8hp won't make a 4m rib plane with 2 people in. It's not a big enough motor.
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06 November 2012, 18:21
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#4
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Member
Join Date: Nov 2012
Posts: 8
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He's a Turkish rib virgin
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06 November 2012, 18:29
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#5
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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: 13,054
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Quote:
Originally Posted by martin.aveyard
He's a Turkish rib virgin
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Still needs a bigger motor though.
At least 20-25hp.
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06 November 2012, 18:36
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#6
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Member
Country: UK - England
Town: NW& wherever the boat is!
Boat name: depends on m'mood!
Make: Humbers/15-24m cats
Length: 6m +
Engine: etec130/big volvos
MMSI: many and various
Join Date: Nov 2001
Posts: 1,816
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but is has made a few peeps look up Parsnip outboards on t'internet...me for one 
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06 November 2012, 18:36
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#7
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Member
Country: UK - England
Town: Dorset & Hants
Boat name: Streaker/Orange
Make: Avon/Ribcraft
Length: 4m +
Engine: 50Yam/25 Mariner
Join Date: Apr 2007
Posts: 5,551
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I 'just' ( only just !) got a 3.5 humber RIB to plane with a 9.9 4stroke merc on it ..It was on a flat calm river and the hull was not exactly a deep V.....
It felt like it took about 3 days to get there from opening the throttle too....
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06 November 2012, 18:37
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#8
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Member
Join Date: Nov 2012
Posts: 8
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The rib came with an anchor with 25 meters of string. Do you think this is adequate as he is hoping to scuba dive
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06 November 2012, 18:40
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#9
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Member
Country: UK - England
Town: NW& wherever the boat is!
Boat name: depends on m'mood!
Make: Humbers/15-24m cats
Length: 6m +
Engine: etec130/big volvos
MMSI: many and various
Join Date: Nov 2001
Posts: 1,816
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Quote:
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with 25 meters of string. Do you think this is adequate as he is hoping to scuba dive
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well you being the one who has seen it, one assumes from your terminology you obviously know it isn't
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06 November 2012, 18:50
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#10
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Member
Join Date: Nov 2012
Posts: 8
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Yes I an sorry it was a silly question as the bay averages 25 to 30 meters and a prevailing wind that makes it a kite. surfers dream
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06 November 2012, 18:53
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#11
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Member
Country: UK - England
Town: Salisbury
Boat name: Blue C
Make: XS 600
Length: 6m +
Engine: 125hp Opti
MMSI: 235082826/235909566
Join Date: Jan 2004
Posts: 1,439
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Ah Parsun
They start First time,
its a shame thats the only time !!!
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06 November 2012, 19:05
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#12
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Member
Join Date: Nov 2012
Posts: 8
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I started it today for the first time. Idiot know he the choke was in or out and when it eventual started it was ticking.over at about 4000 rev . Took the cover off and found the accelerator cable was jammed open. This was straight out of the box
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06 November 2012, 19:11
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#13
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Member
Country: UK - England
Town: NW& wherever the boat is!
Boat name: depends on m'mood!
Make: Humbers/15-24m cats
Length: 6m +
Engine: etec130/big volvos
MMSI: many and various
Join Date: Nov 2001
Posts: 1,816
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Quote:
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the bay averages 25 to 30 meters
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that'll be no then! 
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06 November 2012, 23:16
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#14
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Member
Country: UK - England
Town: yorkshire
Boat name: little vicky
Make: avon ex RNLI
Length: 3m +
Engine: tohatsu
Join Date: Mar 2008
Posts: 2,310
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Eeeeeeh i dont kow You would have thought that as Parsons were the first pioneers of steam turbines in ships & boats over a hundred years ago and major quality marine engineers in the Tyneside area
you would have thought they would have sussed out cavitation in this day and age
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07 November 2012, 08:31
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#15
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Member
Country: UK - England
Town: macclessfield
Boat name: Reach Out
Make: Quicksilver
Length: 4m +
Engine: 30hp Tohatsu EFI
Join Date: Aug 2010
Posts: 301
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Its not impossible for a 4 meter light sib to plane with a 10hp motor and 2 people...
Calm weather and motor height correct, and people moving towards the bow... (not so much as to lift the prop out..) Correct prop pitch also, with a max speed of around 13 knots... ....
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07 November 2012, 10:07
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#16
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Member
Country: UK - Wales
Length: no boat
Join Date: Jan 2012
Posts: 1,012
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Quote:
Originally Posted by martin.aveyard
The rib came with an anchor with 25 meters of string. Do you think this is adequate as he is hoping to scuba dive
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Quote:
Originally Posted by martin.aveyard
Yes I an sorry it was a silly question as the bay averages 25 to 30 meters and a prevailing wind that makes it a kite. surfers dream
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By sound of it yer mate needs bout 75 meter of twine for that depth, with couple a meters of chain to keep the anchor shank down.
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07 November 2012, 11:29
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#17
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Member
Country: Other
Town: Lima-Peru
Boat name: Nautile
Make: Sea Rider 450 Rib
Length: 4m +
Engine: Tohatsu 5/18/30 HP
Join Date: Sep 2007
Posts: 1,998
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Those Asian ribs are generally long shaft transoms, assume he's mounted a short shaft engine. If the keel transom height exceeds 40 cm you need to chop transom down to 40 cm. Engine will push rib nicely but don't expect to be on plane with a 9.8. If that's the case get at least a 15 HP long shaft engine.
Happy Boating
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08 November 2012, 22:37
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#18
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Member
Country: UK - England
Town: cornwall
Boat name: nothing
Make: rib eye 430
Length: 4m +
Engine: tatsu 50
MMSI: 666
Join Date: Mar 2006
Posts: 1,914
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Quote:
Originally Posted by Locozodiac
Those Asian ribs are generally long shaft transoms, assume he's mounted a short shaft engine. If the keel transom height exceeds 40 cm you need to chop transom down to 40 cm. Engine will push rib nicely but don't expect to be on plane with a 9.8. If that's the case get at least a 15 HP long shaft engine.
Happy Boating
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i wondered that too , i don't know of any 4 m ribs that use a short shaft now .
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