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28 May 2015, 20:11
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#1
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Member
Country: UK - England
Town: Wigan
Boat name: ?
Make: Bombard 380
Length: 3m +
Engine: 2S18hp 2S15hp 2s9.8
Join Date: Sep 2013
Posts: 189
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What prop are you using? 25/30hp
Hi, need a new prop for Johnson 2s 30hp. At the moment I have a 10x15x3 on and having fitted a mini rev counter found only to be reaching 4700 at wot, on a bombard 380. That was with 3 up and 40l of fuel,,, plus a bit of gear.
Just would like to know what other 25/30 hp outboards are using on similar size sibs?
Know I need to go down a few pitchers, 10x11 or 10x12? 3 or 4 blade.
Have done lots of reading on the net but would like some fellow sib users advice.
Cheers Al.
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28 May 2015, 20:45
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#2
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Member
Country: UK - England
Town: Bristol
Boat name: Salty Cheeks
Make: Honwave
Length: 3m +
Engine: 20hp 2stroke Mariner
Join Date: Mar 2014
Posts: 485
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Quote:
Originally Posted by Big Al C
Hi, need a new prop for Johnson 2s 30hp. At the moment I have a 10x15x3 on and having fitted a mini rev counter found only to be reaching 4700 at wot, on a bombard 380. That was with 3 up and 40l of fuel,,, plus a bit of gear.
Just would like to know what other 25/30 hp outboards are using on similar size sibs?
Know I need to go down a few pitchers, 10x11 or 10x12? 3 or 4 blade.
Have done lots of reading on the net but would like some fellow sib users advice.
Cheers Al.
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Hi
What is your wot range.Really it needs to be you and lightly loaded boat
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29 May 2015, 00:53
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#3
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Member
Country: UK - England
Town: Wigan
Boat name: ?
Make: Bombard 380
Length: 3m +
Engine: 2S18hp 2S15hp 2s9.8
Join Date: Sep 2013
Posts: 189
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wot is 5200 to 5800,
its not very often I'll be on my own, if I find its to low with a smaller pitch prop I can all ways put 10x15 back on.
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29 May 2015, 10:42
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#4
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Member
Country: UK - England
Town: Bristol
Boat name: Salty Cheeks
Make: Honwave
Length: 3m +
Engine: 20hp 2stroke Mariner
Join Date: Mar 2014
Posts: 485
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Quote:
Originally Posted by Big Al C
wot is 5200 to 5800,
its not very often I'll be on my own, if I find its to low with a smaller pitch prop I can all ways put 10x15 back on.
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Hi
You need to be in the WOT range preferably at the upper end mid way is ok.150 to 200 rpm raise or lower with each pitch.
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29 May 2015, 14:38
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#5
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Member
Country: UK - Scotland
Town: Isle of Lewis
Boat name: Macleod Special
Make: Mako Thundercat
Length: 4m +
Engine: Yamaha 70ces
Join Date: Jul 2010
Posts: 1,265
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We had a tohatsu 30 on the back of a 4.1m Surfcat, used a 10x13p mostly, couldve gone to 14p I think but 13 was good for allround
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31 May 2015, 18:00
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#6
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Member
Country: UK - England
Town: Wigan
Boat name: ?
Make: Bombard 380
Length: 3m +
Engine: 2S18hp 2S15hp 2s9.8
Join Date: Sep 2013
Posts: 189
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Quote:
Originally Posted by Roflhat
We had a tohatsu 30 on the back of a 4.1m Surfcat, used a 10x13p mostly, couldve gone to 14p I think but 13 was good for allround
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Cheers for the reply, what sort of load did you have on.
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01 June 2015, 11:48
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#7
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Member
Country: UK - Scotland
Town: Isle of Lewis
Boat name: Macleod Special
Make: Mako Thundercat
Length: 4m +
Engine: Yamaha 70ces
Join Date: Jul 2010
Posts: 1,265
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Quote:
Originally Posted by Big Al C
Cheers for the reply, what sort of load did you have on.
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Boat was about 76kg, 25l fuel tank, 20kg anchor and kit bag and usually two people with a combined weight of around 130kg
Would top out at 34 knots
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23 June 2015, 16:35
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#8
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Member
Country: UK - England
Town: London
Boat name: Boat
Make: Bombard Aerotec 380
Length: 3m +
Engine: 25hp Mercury 2stroke
Join Date: Jun 2011
Posts: 10
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I have a 25hp Mercury 1981, with a new solas 13" pitch stainless on and it is a fantastic all round prop. Would highly recommend. Interestingly I did notice a significant drop in steering torque when I changed to the stainless prop. Not expected but definitely helpful.
So I would recommend a 10x13 stainless.
Matt
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23 June 2015, 16:36
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#9
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Member
Country: UK - England
Town: London
Boat name: Boat
Make: Bombard Aerotec 380
Length: 3m +
Engine: 25hp Mercury 2stroke
Join Date: Jun 2011
Posts: 10
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Sorry, just realised I failed to mention that I am running the 25 merc on a Bombard 380 aerotec as well. Plenty of power for a full load of people and scary (but fun) with one person!
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23 June 2015, 20:58
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#10
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Member
Country: UK - England
Town: Wigan
Boat name: ?
Make: Bombard 380
Length: 3m +
Engine: 2S18hp 2S15hp 2s9.8
Join Date: Sep 2013
Posts: 189
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Cheers for your info,,,,
Looking like 10x12 or 10x13. 3 blade.
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23 June 2015, 22:09
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#11
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Member
Country: UK - England
Town: Wirral & Caernarfon
Boat name: That's Enuff
Make: Revenger & Avon SR4
Length: 7m +
Engine: Honda 150HP & 50HP
Join Date: Jul 2011
Posts: 4,421
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Quote:
Originally Posted by Big Al C
Cheers for your info,,,,
Looking like 10x12 or 10x13. 3 blade.
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hi, I've got a 10.5 x 13" quicksilver black diamond prop listed for sale in "list your spare props........", only been used once but was under propped with a 50hp on a SR4, I'm after £75 ono
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Member of S.A.B.S. (Wirral Division)
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24 June 2015, 13:26
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#12
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Member
Country: UK - England
Town: Wigan
Boat name: ?
Make: Bombard 380
Length: 3m +
Engine: 2S18hp 2S15hp 2s9.8
Join Date: Sep 2013
Posts: 189
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Cheers, but have found a new stainless steel 10x13 for £99 on ebay.
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24 June 2015, 19:40
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#13
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Member
Country: Hong Kong
Length: 10m +
Join Date: Oct 2014
Posts: 63
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Please report back on what difference it made on your WOT RPM and overall speed.
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15 July 2015, 23:12
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#14
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Member
Country: UK - England
Town: Wigan
Boat name: ?
Make: Bombard 380
Length: 3m +
Engine: 2S18hp 2S15hp 2s9.8
Join Date: Sep 2013
Posts: 189
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Just got back from a wild camp in Scotland, Loch Linnhe, fitted the Johnson with a stainless steel 10 1/8 x 13 Ballistic prop. New off ebay for £79 plus tenner postage,,,,,
Very similar weight as before, revs are up at wot to 5100 just short of the starting range and the top speed has gone up from 23mph to 26mph.
Back up to Loch Lomond end of the month so will do a retest on my own and min weight.
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16 July 2015, 12:55
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#15
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Member
Country: UK - Scotland
Town: Isle of Lewis
Boat name: Macleod Special
Make: Mako Thundercat
Length: 4m +
Engine: Yamaha 70ces
Join Date: Jul 2010
Posts: 1,265
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You could try lifting the engine slightly to get more revs, those ballistic props have pretty good bite
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16 July 2015, 13:18
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#16
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Member
Country: UK - England
Town: Bristol
Boat name: Salty Cheeks
Make: Honwave
Length: 3m +
Engine: 20hp 2stroke Mariner
Join Date: Mar 2014
Posts: 485
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Quote:
Originally Posted by Roflhat
You could try lifting the engine slightly to get more revs, those ballistic props have pretty good bite
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Hi all
I have a Ballistic prop on mine,my engine was over reving.Spoke to steel developments and was told going up or down a pitch would change the revs by 250-300 rpm either way,extra cupping would give 500 rpm higher but difficult to take off if needed charge was £63 plus £10 postage each way.As Roflhat says though try raising the engine first see where your revs are.
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31 August 2015, 22:24
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#17
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Member
Country: UK - England
Town: Wigan
Boat name: ?
Make: Bombard 380
Length: 3m +
Engine: 2S18hp 2S15hp 2s9.8
Join Date: Sep 2013
Posts: 189
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Got my dates wrong on the Loch Lomond trip, got back last week.(been very busy)
Some good days out on the Loch and all the island out there, bit of mixed weather but good stuff.
Any way after a day out with the family and back to Milarochy bay camp site, the fuel was down to test levels. Under 10L, so the Mrs and daughter went back to the caravan and I went to play. Off loaded as much stuff as I could, so with the basic stuff, left to try some speed trails.
Using remote set ups, so steering from the front, find this so much better for giving it some stick. Any way,,,,, max out at 28mph with the 10 1/8x13 prop and was pushing 5300/5400 .
May well have got a bit more had I gone for a 10 1/8x12 prop but that was not available for the price I got the 13 pitch prop for. Any way its a good alround prop, well pleased for the price.
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30 March 2016, 12:22
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#18
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Member
Country: South Africa
Town: Cape Town
Length: 4m +
Engine: Mariner 60 3cyl 2str
Join Date: Jan 2016
Posts: 90
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Quote:
Originally Posted by Chris Caton
hi, I've got a 10.5 x 13" quicksilver black diamond prop listed for sale in "list your spare props........", only been used once but was under propped with a 50hp on a SR4, I'm after £75 ono
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Hi - Im looking for a new prop.. mine spun the hub after my first 30 seconds on water with my new (old) rib..
Im looking at either a 13 or 15".. mine is a 60hp 1987 - current prop is a bog standard 14" 3 blader..
Going to get a merc spitfire 4 blade, not sure if i shd choose 13 or 15.. what pitch did u choose and howd it turn out?
tx
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30 March 2016, 23:07
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#19
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Member
Country: UK - England
Town: Wirral & Caernarfon
Boat name: That's Enuff
Make: Revenger & Avon SR4
Length: 7m +
Engine: Honda 150HP & 50HP
Join Date: Jul 2011
Posts: 4,421
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Quote:
Originally Posted by Fstarocka
Hi - Im looking for a new prop.. mine spun the hub after my first 30 seconds on water with my new (old) rib..
Im looking at either a 13 or 15".. mine is a 60hp 1987 - current prop is a bog standard 14" 3 blader..
Going to get a merc spitfire 4 blade, not sure if i shd choose 13 or 15.. what pitch did u choose and howd it turn out?
tx
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hi, I ended up with a 11" dia. x 15" pitch ally prop, runs fine max 5900 revs and approx 34knts which I'm happy with, i would think a 15" should be good with a 60hp
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Member of S.A.B.S. (Wirral Division)
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31 March 2016, 05:16
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#20
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Member
Country: South Africa
Town: Cape Town
Length: 4m +
Engine: Mariner 60 3cyl 2str
Join Date: Jan 2016
Posts: 90
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Quote:
Originally Posted by Chris Caton
hi, I ended up with a 11" dia. x 15" pitch ally prop, runs fine max 5900 revs and approx 34knts which I'm happy with, i would think a 15" should be good with a 60hp
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What motor were you running? The gearing also plays a big role.. Mines a Merc mariner, at 1.64 bit under geared compared to Yamaha etc.. That's why they recommend the 13.. Using the prop slip calculator the 13 gave better results over all..
http://www.mercuryracing.com/prop-slip-calculator/
Also my wot rpm per manual is 5300.. Punch the numbers and the 13 tops the 15..
Hope it works out!
Sent from my SM-G900M using Tapatalk
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