DF90 Outboard Height and Propeller Improvement Test

[Canto21]

Hello all, thought to share some changes i did to my setup regarding outboard height and propeller selection. The sticky topic here regarding outboard height is one of the first i read (thank you moonlighter for that and for all your help regarding NMEA2000 information) and indeed there is a BIG difference when you find the optimum height and propeller.

My rib boat :


Some specifications at the time of the test :
2008 SUZUKI DF90 1950cc Engine Range : 4500-5500 rpm
Propeller : Trophy four blade 13.75 x 23 pitch
2008 AB Inflatables Nautilus 17 DLX RIB Boat Boat weight : 490kg
Fuel : 50 litres + 40 litres water
Total. weight in test : around 950kg

Here is a table i made:


And a video :

As you can see the differences in speed and fuel consumption are really noticable.

P.S. Regarding Suzuki Engines 90-115 prior to 2008 (mine is a 2008), i confirm also that the new Interface Cable 2.9.4 works flawlessly, as you can see in the video.

[Moonlighter]

Thanks very much for posting that up, its fantastic to see the results you have achieved by getting that engine lifted up and a great prop selection!

Look at the amazing gains in fuel economy achieved !!!

[Harper]

Impressive, indeed!

[Canto21]

Indeed, when the outboard was so buried ,the numbers were just ok. Now that the AV plate is just gliding on the water surface on a fast cruise and the right pitch propeller to reach the high end of the rev range the numbers (speed and fuel consumption) are really good.

Also, i would like to add that the 23 pitch Trophy (not plus) prop suited the DF90 really well. I also had a 21 pitch Trophy Plus , which is a heavier prop than the nonplus and in weight but also in feel. The non plus has a little less cup and thinner blades so it is a bit faster prop.