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Old 07 August 2006, 14:26   #1
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Correct Prop size for Suzuki DF 115

The current prop is 3 blade 13x21 on the main dealer website it specifies swinging a 15x 23 .The rev range is 5-6000 and my engine revs to the top end of this range I am thinking on a new s/s prop and would like to decrease the revs slightly for a more relaxed ride has any one got any ideas or experience with this set up We occaisionally pull the odd toy but generally 2/3 up cruising thanks .
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Old 07 August 2006, 15:37   #2
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I've got the DF 90 and went up from a 19 pitch to a 21". It brought the revs down from about 6100 to around 5800. It's 14" diameter. The suzuki stainless props go up in even numbers so you'd probably need a 22".

I've just checked my workshop manual and it states 14" diameter for the 90 and 115.
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Old 07 August 2006, 15:46   #3
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Mine's got a 3x14x19 ally prop - I'm also thinking about putting a s/s prop on for a bit more 'bite'.

However - when I measured the unit, a 15" diameter prop won't fit. So I looked more closely at the Suzuki spec pages. The 15" 23" is not a 15x23 prop, but the range of pitch suggested. So don't go ordering a 15" prop unless you want a re-styled a-v plate.
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Old 07 August 2006, 18:08   #4
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Ok thanks guys. Steel developements have a 13 7/8x 21 or a 13 7/8x 23 both in s/s
what effect will raising the diameter by 1 inch have on performance also I tend to think that the 23 will be to much of a jump .
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Old 07 August 2006, 20:52   #5
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I'll be interested to hear how a new prop goes. I'm new to RIBS and still trying to work it all out!

I was talking with the Suzuki dealership last week about a new SS prop for my DF 115. I've a standard issue aluminium (not sure what size) that seems to perform OK and revs to 6000 at WOT so I assume it's pretty close to the right size. They thought a SS prop wouldn't be worth the cost of an upgrade - at least in terms of economy, durability and performance. So I'll leave an upgrade for now.
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Old 07 August 2006, 20:58   #6
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Interesting - my Humber (5.8m) has a 14x17 prop on, got a 19" pitch one on order should arrive in a couple of weeks, but maybe I should have gone for a 21 after all....

I'd be interested to know how you get on with 115hp in 6m of boat with whatever you choose, I may yet have to order another one (more expense, sigh...)
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Old 18 August 2006, 13:55   #7
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Have my new stainless prop ,ordered from steel developments,very helpful and delivered next day Its all fitted and ready to go Its a 13 7/8 x 23 I,m rather hoping it doesn,t drop my revs down too much but were soon gonna find out,only then will I know wether its a waste of money or not.
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Old 20 August 2006, 19:21   #8
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Quote:
Originally Posted by BogMonster
Interesting - my Humber (5.8m) has a 14x17 prop on, got a 19" pitch one on order should arrive in a couple of weeks, but maybe I should have gone for a 21 after all....

I'd be interested to know how you get on with 115hp in 6m of boat with whatever you choose, I may yet have to order another one (more expense, sigh...)
Take care when comparing propeller pitch on different motors, because the gearbox ratios aren't always the same. A 19" pitch prop on one motor may give the same final 'gearing' as an 18" pitch prop on another.
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Old 24 August 2009, 16:50   #9
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I have a DF115 with 14/21 prop and looking to move to S/S. We heavily load the boat with divers and flat out is often 25 knotts at 4500 revs. I've seen at 13/21 4 bladed. Any thoughts? Changing the pitch is well documented - how much change will 1" off the diameter make?
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