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Old 27 November 2018, 05:13   #1
Member
 
Country: UK - England
Town: barnstaple
Boat name: sportboat s250
Make: avon
Length: 3m +
Engine: 4hp outboard
Join Date: Nov 2018
Posts: 6
how much power?

Hi guys
i currently have a very old Avon s250 sportboat, running a tiny 4hp outboard. it says on the transom plate it is rated to 25hp but has useful hp of 15. if anyone knows anything about these old SIBs is it worth me getting a 15? would the performance over a 10 be worth it? I'm very undecided as with the extra weight and fuel costs on one hand but obviously on the other there is MORE POWER! how much does it take to get one of these to plane? I'm not a small guy, certainly lighter than a friend who goes out with an excel boat of a similar length, and he gets on the plane very easily with a 10...
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Old 27 November 2018, 05:39   #2
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Country: UK - England
Town: Winchester
Boat name: The Bandit
Make: Ribtecer 535
Length: 5m +
Engine: Yamaha 90 2-Stroke
Join Date: May 2009
Posts: 312
Welcome Sam.

I have an Avon Rover 310 with a wooden floor and that flies with my Tohatsu 9.8. Actually I think it would be dangerous with another 50% power.

Just my view.
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Old 27 November 2018, 06:08   #3
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Country: UK - England
Town: barnstaple
Boat name: sportboat s250
Make: avon
Length: 3m +
Engine: 4hp outboard
Join Date: Nov 2018
Posts: 6
that was another of my concerns, its a very old boat after all...
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Old 27 November 2018, 09:40   #4
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Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Mercury
Length: 3m +
Engine: Suzuki Outboard/25/4
MMSI: 235074042
Join Date: Oct 2011
Posts: 4,730
I had a 15 on a zodiac zoom went like a dream just because you have 15 horses doesn't mean you have to use um throttling back is better for fuel consumption and the engine it's rated to 25 so plenty of strength in the boat, great boats avons.
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Old 02 December 2018, 04:32   #5
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Country: UK - England
Town: barnstaple
Boat name: sportboat s250
Make: avon
Length: 3m +
Engine: 4hp outboard
Join Date: Nov 2018
Posts: 6
thanks very much guys!
i think i'll just wait until the right engine of either size comes up at the right price. Or find a way of convincing the Mrs to let me buy a new one
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Old 02 December 2018, 11:33   #6
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Country: UK - England
Town: East
Boat name: Seaflyer
Make: Humber
Length: 6m +
Engine: Evinrude
Join Date: Feb 2014
Posts: 223
A friend of mine had the S250 with Evinrude 25. The boat was only rated at 25hp if you had the remote steering and controls if I remember correctly otherwise 15hp tiller was max. It did go well though!
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Old 02 December 2018, 13:37   #7
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Make: Humber
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Old 20 December 2018, 11:40   #8
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Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,641
Quote:
Originally Posted by Seaflyer02 View Post
A friend of mine had the S250 with Evinrude 25. The boat was only rated at 25hp if you had the remote steering and controls if I remember correctly otherwise 15hp tiller was max. It did go well though!
I get the wheel / tiller thing - get the weight forward!

Here is a curveball Q.... I've got a W300... which i believe is the "robust" (read: industrial so heavier?) version of the S series... it is also rated for 25 but no mention of a wheel...

I'm typing this from memory, so be aware my "W= heavy" theory might be a figment of my imagination!
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Old 20 December 2018, 21:01   #9
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Country: USA
Town: California
Make: zodiac futura
Length: 4m +
Join Date: May 2018
Posts: 132
how much power?

Quote:
Originally Posted by minisponger View Post
Hi guys

i currently have a very old Avon s250 sportboat, running a tiny 4hp outboard. it says on the transom plate it is rated to 25hp but has useful hp of 15. if anyone knows anything about these old SIBs is it worth me getting a 15? would the performance over a 10 be worth it? I'm very undecided as with the extra weight and fuel costs on one hand but obviously on the other there is MORE POWER! how much does it take to get one of these to plane? I'm not a small guy, certainly lighter than a friend who goes out with an excel boat of a similar length, and he gets on the plane very easily with a 10...


My first sib was a 1985 Avon spitfire. 30 hp max and thatís what I had on it. Back then the motor weighed 116 lbs. and it was designed to take controls that just clipped on it. The tiller handle that you just pushed up when using steering setup. It was blazing fast but less with two. Just ok with 3 and would barely plane with 4+ so Iím a believer in more hp is more fun.
My second sib was a small 12í with a 20 hp. Fast with one. Slow with more. With 3-4 itís a displacement hull.
P.s. I just looked at your pic again and thatís the same engine only smaller. Great design having both tiller/ remote control.
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Old 18 March 2019, 03:31   #10
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Country: UK - England
Town: barnstaple
Boat name: sportboat s250
Make: avon
Length: 3m +
Engine: 4hp outboard
Join Date: Nov 2018
Posts: 6
Quote:
Originally Posted by minisponger View Post
thanks very much guys!
i think i'll just wait until the right engine of either size comes up at the right price. Or find a way of convincing the Mrs to let me buy a new one
So I've ended up with a 15! Now just to wait until the weather improves so I can give it a go! Pictures to follow when I can get going on it. When the summer comes I'd love to have a play around with some more people in different places so hopfully I'll get out and about for a bit of proper boating!
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