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Old 17 June 2008, 12:54   #1
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Maximum planing ability of an SR4

Sorry, I couldn't think how to properly word the heading

This is aimed at any current or past SR4 owners (I know theres a couple of you out there)

I know an SR4 is designed to carry a maximum of 6 but I would like to know if it's possible to plane with this amount of average sized adults using a 50hp (hull open)

If not then what's the maximum you've managed to get your SR4 to plane with?

I'm interested to find out as I don't want to head to the coast with 4 or more people if there's no chance of the boat planing.

If you reply, please state engine size, sea state and seating arrangements...cheers very much
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Old 17 June 2008, 13:04   #2
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Prop it correctly for carrying 6 people and it will plane. It'll rev its nuts off solo though.
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Old 17 June 2008, 13:48   #3
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Mine will plane with 5 adults, and kit. I think I was using a 10 1/4p x 12d prop. And as nos says, it over revs with just me in it.
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Old 20 June 2008, 06:09   #4
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looking through and old avon brochure it says with a 50 hp and 1 person 40 mph , 4 persons 28 mph and with 6 persons 22 mph but the books years old and they are only approx figures , so modern engines should do better, but as NOS just said a lots to do with having the right prop.
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Old 20 June 2008, 06:19   #5
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My engines a '91 vintage so isn't particularly new but I'd be more than happy if it could push 6 adults along at 22mph, that seems pretty efficient to me! I guess the water would have to be virtualy flat to acheive this though.

Main use will be with 2-4 peeps but it's nice to know it should plane with more if the situation should arise.

Cheers for the info
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Old 20 June 2008, 06:34   #6
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Suz 25 1993 vintage, 11" pitch. 1/2 up - 21 knots on a flat day. Usually nearer the 17/18 mark for cruising comfort and to have a bit extra power in hand if lumpy.

Max I ever had was 3 + 60L fuel, as it was a converted "foredeck" model with a homemade Jockey so not a lot of room for more bods, no idea the speed but V. sluggish to plane, OK once there. Would not have liked to try it in big seas as was pretty much flat out.

Admittedly it was half the HP you are enquiring about......
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