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Old 06 November 2012, 14:10   #1
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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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Old 06 November 2012, 14:16   #2
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My friend has purchased a 4 meter. Chinese type quicksilver rib and a. Parsnip 9.8 hp 4stroke motr.
What the hell was he thinking?!!
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Old 06 November 2012, 14:21   #3
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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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Old 06 November 2012, 14:21   #4
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He's a Turkish rib virgin
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Old 06 November 2012, 14:29   #5
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He's a Turkish rib virgin
Still needs a bigger motor though.

At least 20-25hp.
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Old 06 November 2012, 14:36   #6
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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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Old 06 November 2012, 14:36   #7
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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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Old 06 November 2012, 14:37   #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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Old 06 November 2012, 14:40   #9
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with 25 meters of string. Do you think this is adequate as he is hoping to scuba dive
well you being the one who has seen it, one assumes from your terminology you obviously know it isn't
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Old 06 November 2012, 14:50   #10
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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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Old 06 November 2012, 14:53   #11
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Ah Parsun
They start First time,




its a shame thats the only time !!!
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Old 06 November 2012, 15:05   #12
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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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Old 06 November 2012, 15:11   #13
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the bay averages 25 to 30 meters
that'll be no then!
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Old 06 November 2012, 19:16   #14
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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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Old 07 November 2012, 04:31   #15
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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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Old 07 November 2012, 06:07   #16
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Quote:
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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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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
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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Old 07 November 2012, 07:29   #17
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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.

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Old 08 November 2012, 18:37   #18
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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.

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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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