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Old 20 October 2005, 11:23   #11
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A good read boys, I'll be doing some testing off my own in the next few weeks,

I'm running a 15" alloy prop, trim tabs at 25degree angle with 40lb actuators, flooding hull, 44litres of fuel up front, at the moment, my yamaha 60 2stroke I believe is 112kgs

we should post our findings to find the ultimate SR4 setup - fastest speeds attained with props etc

there is a UK distributer of nauticus parts, (trim tabs) as I got some new actuators and a few other bits -

here -

http://www.streamlinedpropellers.co.uk/smarttabs.html
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Old 20 October 2005, 14:07   #12
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Quote:
Originally Posted by ollyit
A good read boys, I'll be doing some testing off my own in the next few weeks,

I'm running a 15" alloy prop, trim tabs at 25degree angle with 40lb actuators, flooding hull, 44litres of fuel up front, at the moment, my yamaha 60 2stroke I believe is 112kgs

we should post our findings to find the ultimate SR4 setup - fastest speeds attained with props etc

there is a UK distributer of nauticus parts, (trim tabs) as I got some new actuators and a few other bits -

here -

http://www.streamlinedpropellers.co.uk/smarttabs.html

Cool-no price there for them though.

Might be fun to bet a few of us together with the sr4's and try racing...
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Old 20 October 2005, 14:24   #13
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I reckon you're looking around the £90 mark from memory from what the guy said when i was ordering the spares for mine, depending of the "lb" strength of the actuators themselves -

yeah we should hook up!
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Old 20 October 2005, 15:02   #14
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Ollyit,

How fast does your rib go? Have you tried going WOT? My boat starts to break loose at 38 mph. I have alot of stuff onboard though. I wonder if I need the 40lb actuators.

We should definitely post our findings / improvements. I'm sure there are a ton of 4 meter ribbers that could glean alot of good info from our findings.

Boatster
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Old 20 October 2005, 15:42   #15
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Hi Boatster,

I can get 40 MPH out of mine. Not quite WOT, I'm a bit over propped with a 15". I can get it up to about 5300 revs.

I find that I loose control if the engine isn't trimmed right. Trim it up and the whole boat rapidly tips from left to right.

My mates boat with a Yam 2 Stroke 40 HP is a little faster and shows none of these characteristics.

His boat runs a lot lighter than mine. My engine weighs 115 Kgs and he doesn't have PTT etc.

I'm having slight running problems with mine at the moment but once these have been sorted out, during a winter service and warranty work, I aim to have my spare 11" pitch prop redone to 14" and then hopefully I can run at 5500 RPM.

My mate should be getting a GPS soon so then we'll know how fast he goes.

Regards Nick R.
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Old 20 October 2005, 23:38   #16
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Hi Nick,

Maybe I need to get a 15 pitch prop then. I thought I was doing pretty good at 38 mph. Well my rib gets a little unstable at 38 so I think I couldn't go any higher anyways. How is the hole shot with a 15" pitch? Or maybe I could find something along 14 1/2" pitch if it exists. Regardless my MW SS Raptor is working out pretty nicely.

I'm going to raise my motor one hole on the transom. Hopefully this will yield more results. I'll post my findings when I get there.

Boatster
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Old 21 October 2005, 08:53   #17
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Quote:
Originally Posted by boatster_sr4
Hi Nick,


I'm going to raise my motor one hole on the transom. Hopefully this will yield more results. I'll post my findings when I get there.

Boatster
A bit faster maybe, but risk of cavitation in turns and on hard accel from rest. Boat trim will become v important.
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Old 21 October 2005, 13:17   #18
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if you're getting 40mph I need to go up a pitch-my best so far is 35mph...

Hook up next summer? Mine's going to be in use during the winter but I can't see very many takers for a winter do.
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Old 21 October 2005, 14:37   #19
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Hi Boatster,

I'm running a Yamaha High thrust engine. Its set up differently to a normal engine in that it has a larger gearbox, lower gearing and a massive propellor.

I think the prop fits the 80 HP engines. It sends up loads of spray at the back.

Its probably going to be March now before I can retest mine and my mates rigs but I'll try and keep you posted.

Regards Nick.
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Old 04 November 2005, 19:13   #20
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Just did another run this past weekend out to the islands, 26 miles. Before departed I had increased the pressure setting on my 30 lb Smart Tabs. During my return trip in following seas the bow was slamming much harder than before making the ride more unpleasant. I realize that my setting before hand was much better which was a relaxed setup for the 30 lb tabs. I just want to pass this observation to other SR4 members as I know a few of us use the Smart Tabs. I was considering getting 40 lb force tabs but I have changed my mind.

It would be interesting to hear what Ollyits experience is with handling in following seas. Heading seas doesn't seem to matter too much between settings.

Boatster
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