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Old 24 September 2010, 09:50   #1
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4m searider speed?

I have just got off the baot in Portland Harbor and thought I would get a general idea of what you guys get from your 4m Seariders. My GPS (I know I am on FIBnet ) said 34.7knts. I was shocked as I didnt think they were that fast.
I have an evinrude 50hp 2 stroke (E50RNLIB) Not allot else on there to be fair. I was 2 up, with 25ltrs of fuel and draining.
One thing I can say is that my twin 5.4m SR could not keep with it. However it was a little bit rough out there being a southerly force 4. (It soon shot past as we slowed down) Great fun though
I am impressed with the 4m. I might have to go out again on her Mon. Its a shame I am selling it.

Sorry if there has been thousands of threads with the same question. Just very curious.
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Old 24 September 2010, 10:17   #2
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They do fly along, that sounds about right.
I know when I was out with Bam Bam (3.2m Zodiac 40hp) and a mate (4.5m Narwhal 60hp) my little SR4 was the quickest, right upto the point it fell to bits!
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Old 24 September 2010, 11:17   #3
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[ SR4 was the quickest, right upto the point it fell to bits! [/QUOTE]

Was that with the twin pot yammy 55hp? I had that engine on my 5m humber assault. Great engine, crap boat.
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Old 24 September 2010, 11:53   #4
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Yep that was with the Yam twin pot. I've found my GPS now so will be able to see what it does next time out...
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Old 24 September 2010, 12:21   #5
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The 4m certainly put a smile on my face. I compared it to my MK1 Rigid Raider with a 140 on the back, smal boat with a big engine = Great fun
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Old 24 September 2010, 16:47   #6
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I got 40 mph out of mine (40 hp Yamaha two-stroke) with two people in it. It starts to chine walk pretty bad at that speed though.
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Old 24 September 2010, 18:08   #7
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I got 40 mph out of mine (40 hp Yamaha two-stroke) with two people in it. It starts to chine walk pretty bad at that speed though.
I got chine walk with a 60hp clamshell but none with the 55hp twin pot? It feels a better boat with the Yam.
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Old 24 September 2010, 19:40   #8
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I was going to start a thread about this but you have the perfect one going. I have a sr4.0 that I just got a motor for. it is a 2003 50 mercury carberated. The motor came with a 12 pitch prop and the first time driveing it I hit my rev limiter at just about 30 mph. I am trying to dial the prop in but the last time I was out I had a aluminum prop that was a 17 pitch with an aggressive cup. I maxed out at 43 mph but was only taching at 5000 rpm, I was alone with only a battery and about 4 gallons of gas, stock jocky console. at about 40 mphs the boat started to porpise a bit then would want to chine walk A LITTLE. There is a dolphine foil mounted on the motor and plan on taking that off to see if it stops the porpising. It felt like a wild stallion at that speed and i was on a flat pond with the only wakes from my boat. I have a 5.4 and the 4.0 definately is at least as fast. I am haveing a stainless steel prop one set for about a 16 pitch with the hope of bringing the rpms to about 5300. I think motor is about 5400 max rpm. I will update when I get the new prop ready.
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Old 25 September 2010, 02:27   #9
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good luck with that. I had a giggle cracking 34knts in choppy sea. i bet its even better in millpond conditions
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Old 26 September 2010, 05:30   #10
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I get 36 knts gps with 2 people and all the gear and fuel on board. My engine is a 2000 model 40 hp Mercury 2 stroke with power trim and has a 15 p prop at the moment but is over revving to 5800 rpm so am now looking for a 16 p stainless prop Yam or Merc. I dont get really bad chine walking, just ease back a bit or alter trim. I think a lot is down to the weight balance in the boat and set up and condition. My engine is raised at 1 ".
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Old 26 September 2010, 05:42   #11
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I think we all need to pop a few photo's on here too. I am loving the speed you guys are getting.
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Old 26 September 2010, 06:34   #12
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new 50hp..

Last one I had in 2006 I had a brand new Tohatsu 50hp and only ever managed 31 knots.. I don't know if it was becasue the engine was barnad new, but one up was 31 knots 2 up 30 knots.

My older versions with a Clamshell Mariner 60 got 37knots.. so was disappointed with the Tohatsu.

The 3 cylinder yamaha 40hp seems the best as is much lighter than the 50, but is bigger than the 30hp. Very responsive engine.

4m searider is not being driven properly unless you are chine hoping with a big grin on your face!
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Old 26 September 2010, 06:38   #13
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4m searider is not being driven properly unless you are chine hoping with a big grin on your face!
Can't get mine to chine walk, even if its trimmed all the way out with the 55 on, still get the big grin factor though!
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Old 06 October 2010, 23:40   #14
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update on speed

tried the 4.0 with my SS prop. It is about a 16 pitch with what I am told is an sagressive cup. After a few runs I got great acceleration, at about 39mph it started to porpous, , The motor has the newer dolphine one piece wing, Playing with the trim I got to 42 mph and was running at 5500 rpm, max rpms for the motor. I decided to take the fin off the motor and ran the boat a couple more times. the bow lift without the tab is always fun. My experience with the natilus trim tabs on my 5.4 and the fin on the 4.0 work wonders to put the boats on plain. great for heavy loads Im sure. I achieved speeds of 41 1nd mayby 42, I still have to check the gps. Without the fins though I did think the boat started to get a lot more looses a few mph than with it, I would porpose not bad and I could slow it down a bit by trimming the motor but it never went away. My concern now is that I had a lot of water being sprayed straight up at my motor from the starbord rear tube. none from the port side. the water was like a hose turned lose. I have a small seam lose and didnt want to continue playing with the possibility of it getting worse. hope this is usefull for someone, And I will post some pics soon.
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Old 07 October 2010, 05:07   #15
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I think we all need to pop a few photo's on here too. I am loving the speed you guys are getting.
32knots. Mariner 40hp 2 Stroke. Very Lightweight Setup. No chine walking. Best boat I ever owned!
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Old 08 October 2010, 05:29   #16
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37 knots with 50hp yamaha on my "deluxe" 2 up.

26 knots with 3 cyl 30hp Yamaha, one up in the current rescue spec one.
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Old 08 October 2010, 05:58   #17
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33 knots two up about 28 knots 4 up, 40 hp mariner.
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Old 08 October 2010, 14:24   #18
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Check this out

How fast will this GO
http://cgi.ebay.co.uk/RIB-SEARIDER-S...item4cf23753da
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Old 09 October 2010, 01:25   #19
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It's got a Force on. How fast can it drift

I got 39 knots out of my SR4, flat calm, mid 90s 50hp Mariner (non bigfoot), 14" pitch prop, 2x25L fuel tanks in console. Trimmed a log way out and holding on very tight!
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Old 09 October 2010, 02:03   #20
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I have no real experience with the force engines personally. I know they are an offcast of all of the old chrysler (not a spelling test ) engine parts with a mercury marine badge on it. I dont think I would haave one
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