Suzuki DF90 props

BruceB · 26 July 2009, 19:10

Any idea where to get a Stainless or alloy four blader? None of the websites seem to stock the correct 14" dia only 13 "

wavelength · 27 July 2009, 21:18

I'm looking for a replacement for a DF90 prop also. my wot revs are too high and need to go to 21inch I think from 19inch
Steel developments have SOLAS props but there are also these people. I've e mailed them and awaiting a reply.
http://www.propellersolutions.co.uk/products.htm
Any reason in particular for the 4 blader?

BruceB · 27 July 2009, 21:30

Why not?

I ordered one today from Steel developments, 13.75 x 17 four blader.
I will sometimes carry diving kit and lifting this all onto the plane should be easier with four blades. If it works out all right I may get one for cruising (13.75 x 19) as well as they are supposed to be smoother. I am not really interested in flat out speed, more smooth economical cruising.

I'll see what happens as it wasn't that expensive for the alloy version to try, £130 delivered.
Let me know how you get on with yours and if it is any better or worse than genuine suzuki. I ceratinly found I couldn't improve on genuine yam K props with the old boat, even using stainless..

wavelength · 28 July 2009, 08:04

what sort of WOT revs are you getting, ours are too high with a 19inch on a 6m destroyer

BruceB · 28 July 2009, 15:52

I only get 5100 WOT with a DF90, don't understand how you get more than 5500 WOT with a slightly larger RIB unless it is very lightly set up?

wavelength · 28 July 2009, 16:01

ooh no something amiss here. I'll pm ya and we can compare figures as we progress eh.

BruceB · 09 August 2009, 18:54

Well I got and tried the four blader today and also tried my 19" dropped to 18" which came back yesterday. all cruising at approx 4300rpm

The original 19" Suzuki prop managed around 5200 WOT and about 30ish knots, cruise 24knots
The new 4 blade 17" manages around 5600 WOT and 28.5 knots. cruise 20knots
The repaired original 19" dropped to 18" now manages 5400 WOT and around 28 knots, cruise 22knots
I don't mind the 4 blader as I expect when the boat is loaded with four twinsets and divers this will be ideal but I think I will go back to 19" for cruising.
I suspect the weight of my boat is the difference as it is fairly loaded up with kit etc

wavelength · 10 August 2009, 14:44

Hi Bruce
Not been able to do anything about mine as we have been called in to do some commercial work to cover for injured skipper (i.e. daughter who broke her shoulder downhill biking in the alps-silly !*! ) When I am eventually allowed back ashore I'll get a prop delivered. Oh well back to bobbing around, great fun really, nice big fast boat and they pay me to blast about in it

although when you have seen one wind turbine you've seen them all!

BruceB · 10 August 2009, 21:51

I talked to Steel developments and they are going to alter my 4 blader to 18" cheap cos its new.
I am also going to sell the 3 blade 18" prop and buy a new 19" so this is for sale for sensible offers. It is just back from getting repaired and set to 18" but there was no significant damage before the repair other than a couple of minor chips.
It doesn't seem worthwhile paying another £65 or so to reset it back to 19" so I will buy a new one and hopefully recover the £65 I just spent getting it sorted rather than pay a total of £130 and still end up with the prop I started with! I may even put the money towards a SS prop

Its only back a couple of days and travelled about 1 mile across the harbour testing yesterday.

Leo · 11 August 2009, 08:48

If you got the new DF90 from Suzuki, Yamaha props wil also fit. I've tested a few and it works fine! Also the Yamaha props are better cupped and offer better range.

wavelength · 20 September 2009, 21:41

put a new suzuki 21 inch ali prop on today to replace the 19 inch as originally supplied with the suzuki DF90/6m destroyer.
Yesterday with the 19 inch, 5 people and 80 litres or so of fuel got around 5700 + rpm at 29 knots straight into an ebbing tide which was doing 2/3 knots.
The 21 incher peaked out into the same tide and load conditions at around 5400 with a gps reading of just over 30 knots.
So with the tide taken into account the actual speed thru the water was 2/3 knots over the gps readings. No probs at all at the bottom end and we all felt that the mid range acceleration was better. Need to try it with just the two of us onboard sometime when I am home again but as yet seems like job done!

wavelength · 07 March 2010, 20:06

eventually home for a day or two.
21 inch suzuki ali prop 4 persons and 80 odd litres of fuel onboard
WOT 5600rpm 33+knots max 35knots with a bit of tide behind us
4500 rpm cruise 25 knots
so it has solved the over rev problem with the 19 inch ali supplied originally which used to exceed 6000rpm
The trim angle on this boat does need to be right for max speed. Cant undertand why yours is so slow Bruce. There is a lot of kit on this boat as well as fuel and 4 people

BruceB · 07 March 2010, 20:47

You have suzukis down on your profile, is this a 6m with one or two DF90's?
I probably still have more kit aboard though, everything down to the batteries is doubled up plus it has a double width console containing a fair amount of spares along with 90lts of fuel.

wavelength · 07 March 2010, 21:31

6m destroyer with single df90 sooosoooki
1 Single deluxe consol or whatever they call it double seat pod behind that. Built in 90 l tank, two 30 l portable tanks and the training kit and all the gear two women consider compulsory for a blast across the bay in cold cold weather.
How is the double consol Bruce?? Do you find that the boat is wide enough for it?

BruceB · 07 March 2010, 22:07

The console fits fine with a bit of care, so much so that Humber decided it was possible after all and stuck a pic of the boat on their site.
I suspect air resistance and weight are behind the performance figures between the hulls, my console and kit puts a lot of weight forward plus the anchor locker up front is pretty crowded. There is also an aux, it all adds up to a fairly heavy setup but its all needed because I operate fairly regularly in remote areas.
My motor is due a service so I'll ask them if anything is coming up on the computer as a problem when they do it.

wavelength · 08 March 2010, 10:25

weight possibly but we did have 4 people on board. All top speeds were achieved with the maximum amount of "up-trim" we could get before it started ventilating. Our Ocean Pro is more susceptible to trim than the destroyer and the limiting factor on that one is usually chine walking before ventilation.