Suzuki DF90 propeller for a 5.2 m RIB

[MatFromPoland]

oh so you have to change !!! You can damage engine if you go over reco RPM.
But 19 can lover maybe about 300 RPM. In one person it can't be still enough
If you need to lover to 5500 I would suggest 21 even

[jeffstevens763@g]

Originally Posted by MatFromPoland

I think it was 45 miles so it be about 39 knots.

Based on this website Suzuki Marine - Product Lines - Outboard Motors - Products - DF90 - 2012 - DF90A
RPM range is 5300 - 6300 so you do not exceed it.
If you plan to make fast trips with 2 people you can try to use 19"

But if you plan to go with more people and max is not so important maybe you can stay at this prop

also backed up by the manufacturer at thr time

[Valiant Knight]

I apologize about the remark but, in Portugal, we use km/h and not mph (for land speed) so, for me, mph means nmph or knots.
Since 45 knots for this kind of boats is quite fast, I was only trying to make sure we were using the same units.

Antonio Manuel Carrapatoso

[jonp]

I've changed every outboard I've owned over to Solas props, their service is second to none. I change boats quite regularly so they know me well when I give them a call, they also know I like to squeeze out as much performance as possible with each boat I've owned.

My last boat had the newer Suzuki 90's that rev out to 6300rpm this is the boat and performance stats in good old metric measurements, click the performance tab and look under signature 502 https://suzukimarine.com.au/outboard.../product/df90a

That outfit did come with a Suzuki 19pitch which I dropped down to a Solas 17 for better exceleration for extreme bar crossings and heavy loads. Economy was something you don't really need to worry about as they are simply that good. Work on 45 kmh for a fuel burn of 15 lth at 4500rpm. Unfortunatly a mako did make quite a mess of the prop and engine when it got a little grumpy when I took a dolphin fish away from it!!

If you go Solas 4 blade you may need to drop down to 15 pitch, but after owning a stainless Solas 4 blade I would save your money and stick with a 3.

Jon

By the way I'm now back with Yamaha my more preferred outboard not that there's anything wrong with Suzuki.

[jeffstevens763@g]

Originally Posted by Valiant Knight

I apologize about the remark but, in Portugal, we use km/h and not mph (for land speed) so, for me, mph means nmph or knots.
Since 45 knots for this kind of boats is quite fast, I was only trying to make sure we were using the same units.

Antonio Manuel Carrapatoso

45 mph = 39.1 knts
45 mph = 72.5 kmph.
thats the best i got two up 70lts of fuel very good flat conditions

[MatFromPoland]

Originally Posted by jonp

By the way I'm now back with Yamaha my more preferred outboard not that there's anything wrong with Suzuki.

Can you compare petrol consumption in Suzuki DF90 and Yamaha 90 ?
Is it really Suzuki so good in petrol consumption thanks to "lean burn" ?

Or in the Sea petrol consumption is very similar ?

Not sure if these are adequate but in below mentioned links Yamaha 115 has even better petrol consumption than Suzuki 115

Suzuki DF 25 - 60 - 90 - 115 - 140 - 175 - 225 - 250 - 300 hp Outboard Fuel Consumption Liters per hour | Portable 2.5 - 4 - 6 - 9.9 - 15 hp
Yamaha F 25 - 50 - 70 - 90 - 115 - 150 - 175A - 200 - 225 - 250 - 300 - 350 HP Outboard Fuel Consumption Liters per hour | Portable 4 - 5 - 6 - 8 - 9.9 - 15 - 20 hp