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29 January 2013, 23:17
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#1
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Member
Join Date: Jan 2013
Posts: 13
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Speed
I have a tender of 3 meter rib with 30 jp Honda engine is there a way I can gain anymore speed
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29 January 2013, 23:28
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#2
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Member
Country: UK - Isle of Man
Town: Douglas
Make: Humber
Length: 5m +
Engine: Outboard
Join Date: Jan 2013
Posts: 9
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A few options to investigate.
1) Make sure engine is in optimum rpm range, ie correct prop.
2) Check engine transom height and try adjusting upwards.
3) Adjust engine trim angle.
4) Fit trim tabs (doesn't always work)
5) Remove weight
6) Tune engine (ie bring back to factory spec)
7) Bigger engine
Hope this helps
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29 January 2013, 23:29
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#3
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Member
Join Date: Jan 2013
Posts: 13
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I will give a few ago when the weather gets better
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30 January 2013, 02:48
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#4
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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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A larger than 30 hp engine on a 3 m RIB would not be a good idea 
Probably a weight distribution /trim problem.
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Running around like a head with it's chicken cut off.
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30 January 2013, 09:40
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#5
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Member
Join Date: Jan 2013
Posts: 13
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The max is 30hp for it and I do not want to spend a lot of money on a new engine
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30 January 2013, 10:39
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#6
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Member
Country: UK - Wales
Length: no boat
Join Date: Jan 2012
Posts: 1,012
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Hi Skinnylegaman,
So what speed are you getting with current setup.
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30 January 2013, 12:28
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#7
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Member
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,671
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Quote:
Originally Posted by skinnylegaman
3 meter rib with 30 jp Honda engine
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Aerodynamic crash helmet like the speed skiers???? 
That is a LOT of gee gees for a 3m. Do you race it, or just need the thrill of more speed?
Engine max RPM at WOT would be a useful one as well to get a feel for your prop pitch.
....and welcome to ribnet! 
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30 January 2013, 12:37
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#8
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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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A 3 mtr standard rib with a 30 HP is out of this world, that size rib is normally rated for a 20 HP. Can you post pics of that rib/engine combo.
Happy Boating
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30 January 2013, 14:54
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#9
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Member
Country: USA
Town: California
Make: Avon 5.4m Searider
Length: 5m +
Engine: Yamaha 90
Join Date: Aug 2011
Posts: 1,260
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We have a 30 hp 2-stroke on a 3.77m sib and we're getting 29 mph with 3 people & gear. In that boat, I wouldn't want to be going any faster!
With a rigid hull, I could see going a few mph faster.
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30 January 2013, 16:17
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#10
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Member
Join Date: Jan 2013
Posts: 13
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We have a rigid hull we are at 24 knot and I don't race however have had some fun with other ribs I will have a look for a picture
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30 January 2013, 16:22
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#11
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Member
Join Date: Jan 2013
Posts: 13
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A pic for u
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31 January 2013, 11:21
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#12
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Member
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,671
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NCP - 29mph = (approx) 25 knots
Skinny - How heavy is your hull etc? Is it a Deep V? (Not a hull I'm acquainted with) Yopu are getting approx 2 knots more than I got out a lardy waterlogged SR4 with a 30, so you might get a bit more out of her, but your speed is in the right ballpark. Any idea of your WOT revs?
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31 January 2013, 17:35
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#13
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Member
Join Date: Jan 2013
Posts: 13
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Erm not sure on revs and the hull is deep v I believe the hull is heavy
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31 January 2013, 18:46
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#14
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Member
Country: UK - Channel Islands
Town: Jersey
Boat name: Archangel
Make: Ribcraft
Length: 6m +
Engine: ETec 225
MMSI: 235063789
Join Date: Sep 2008
Posts: 1,005
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Isn't 25kts fast enough? I don't know, kids nowadays are obssessed with speed. I remember during the war we had to make do with...zzzz
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31 January 2013, 18:48
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#15
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Member
Join Date: Jan 2013
Posts: 13
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I like to work towards something give my self a challenge to do
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31 January 2013, 20:05
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#16
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Member
Country: UK - England
Town: LONDON
Make: SR4/ZODIAC/3D
Length: 4m +
Engine: 30T/40T
Join Date: Oct 2011
Posts: 1,433
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Quote:
Originally Posted by Limey Linda
A larger than 30 hp engine on a 3 m RIB would not be a good idea
Probably a weight distribution /trim problem. |
who threw her a bone?
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31 January 2013, 20:07
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#17
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Member
Country: UK - England
Town: LONDON
Make: SR4/ZODIAC/3D
Length: 4m +
Engine: 30T/40T
Join Date: Oct 2011
Posts: 1,433
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that was genius, get's me, wrong as it may be it's the quote of the decade.......in context of course
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