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Old 30 November 2021, 07:10   #1
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Country: UK - England
Town: Cambridge
Make: AVON
Length: 5m +
Engine: Yamaha 90hp 2 stroke
Join Date: Aug 2018
Posts: 47
Got myself a searider

So, after 3 years maintaining and running a fleet of 8 SR5.4s at a large sailing club, I’ve finally got my own. Needless to say I’m thrilled

2004 build, no patches on the tubes, under seat stainless tank, and generally in pretty good nick. Also got a mint Yamaha 90 CETO 2 stroke to go on it. Should go quite well

With the club fleet being set up very different (Note: more basic and only 50hp) I have a couple of questions

1. What would be a rough estimate for top speed with a 90?
2. Recommendations for led Nav lights (which do RC use?)

I also have a friend recommending a stainless propeller. What are the benefits to this, and is a stainless prop worth it?

Thanks in advance.
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Old 30 November 2021, 08:08   #2
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Country: UK - England
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Boat name: BlueTube
Make: XS500
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Engine: Mercury Opti 75hp
MMSI: 235098668
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Posts: 226
Will be wayyyy overpowered with a 90hp!
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Old 30 November 2021, 09:04   #3
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Country: UK - England
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Posts: 47
Thanks for the reply.

90 is within the boats rating and is a common setup in the military, dive boats and commercial users.

Are you sure you’re not thinking of a SR4? Max rating 50? This is an SR5.4, max rating 90.

This is a bigger boat than yours, and you have a 75!
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Old 30 November 2021, 09:22   #4
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Quote:
Originally Posted by InlandAlex View Post
Thanks for the reply.

90 is within the boats rating and is a common setup in the military, dive boats and commercial users.

Are you sure youíre not thinking of a SR4? Max rating 50? This is an SR5.4, max rating 90.

This is a bigger boat than yours, and you have a 75!
Ah sorry my bad mis-read thought you where talking SR4 actually have 80hp these days
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Old 30 November 2021, 11:42   #5
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Country: UK - England
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Make: Nautica/ribcraft
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Engine: Yam 115/ Honda 100
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Posts: 951
Quote:
Originally Posted by InlandAlex View Post
So, after 3 years maintaining and running a fleet of 8 SR5.4s at a large sailing club, Iíve finally got my own. Needless to say Iím thrilled

2004 build, no patches on the tubes, under seat stainless tank, and generally in pretty good nick. Also got a mint Yamaha 90 CETO 2 stroke to go on it. Should go quite well

With the club fleet being set up very different (Note: more basic and only 50hp) I have a couple of questions

1. What would be a rough estimate for top speed with a 90?
2. Recommendations for led Nav lights (which do RC use?)

I also have a friend recommending a stainless propeller. What are the benefits to this, and is a stainless prop worth it?

Thanks in advance.
I have honda 100 4 str on ribcraft 5.3 , without too many finer adjustments ,about 37 knots.
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Old 30 November 2021, 11:55   #6
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Country: UK - England
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Make: Avon 5.4, Avon 3.4,
Length: 5m +
Engine: Yamaha 90, Merc 30
Join Date: Sep 2003
Posts: 1,953
depends on setup, prop, engine height, 35-39 maybe 40 - tide running etc - I have a 90aeto on my 5.4, messsed around with 19" k serie-s alloy, 20 "laser 2 stainless props - I have a heavier console and whacking great a frame - seen 38knots on raymarine gps at slack water
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Old 30 November 2021, 12:23   #7
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Country: UK - England
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Quote:
Originally Posted by InlandAlex View Post
1. What would be a rough estimate for top speed with a 90?
Depends on the prop and whether it can pull max rpm.

Yamaha 90hp (>84)
Gear Ratio 2:1
WoT range 4500-5500 rpm
Assumed 10% slip

Pitch/Speed (knots)
15" = 30.6
16" = 32.6
17" = 34.6
18" = 36.6
19" = 38.7
20" = 40.7
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Old 30 November 2021, 12:40   #8
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Country: UK - England
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Make: Avon 5.4, Avon 3.4,
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Quote:
Originally Posted by Limecc View Post
Depends on the prop and whether it can pull max rpm.

Yamaha 90hp (>84)
Gear Ratio 2:1
WoT range 4500-5500 rpm
Assumed 10% slip

Pitch/Speed (knots)
15" = 30.6
16" = 32.6
17" = 34.6
18" = 36.6
19" = 38.7
20" = 40.7
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Old 30 November 2021, 13:04   #9
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Country: UK - England
Town: Southampton
Boat name: SMH Rib / War Shot
Make: Ribtec / Scorpion
Length: 4m +
Engine: 100hp Yam/150hp opt
Join Date: Sep 2003
Posts: 2,050
RIBase
My old 5.4 with a 90hp 2 stroke Mariner made 39.7knots with a 20" Laser II propeller. We couldn't quite make the magic 40!
(I think it would have gone faster with the engine raised a little but sold it before experimenting)
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Old 30 November 2021, 14:45   #10
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Country: UK - England
Town: Waterlooville
Boat name: Tickler
Make: Halmatic P22
Length: 6m +
Engine: Inboard Diesel 240HP
MMSI: 235115642
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RIBase
Nice boat - I keep looking at 5.4's and 4.7's.

I'd recommend the Hella Marine NaviLED lights. They are not the cheapest but they use no power and are almost fit and forget. I don't know what Ribcraft fit.
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Old 03 December 2021, 09:35   #11
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Country: UK - England
Town: Farnborough
Boat name: Nostromo
Make: Arrow
Length: 8m +
Engine: 600hp V8
Join Date: Jul 2003
Posts: 1,764
Despite the older design, I still love the searider. Did many rescue duties in a 4m and 5m back in the day and they could take anything we threw at them. Never once felt unsafe in one, even with some proper snotty condition rescues occasionally.
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