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Old 06 March 2017, 22:35   #71
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yes i am new to also coming from a sib but even that ive only head for 1 yr so ive got a big hill to climb
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Old 07 March 2017, 08:22   #72
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yes thank you sameh. but the more and more i think about this the more and more i am talking myself down in hp, because i will have 2 uses for the boat one being out with the family so will not be flooring it with the kids and wife on board (unless the sea is like a mil pond which is few and far between) and then there's me taking it out fishing and thinking i dont need a Porsche to go to the corner shop to get a newspaper and now instead of that paper costing 50p its now cost me close to a tenner. omg there is a lot to take in when dealing with all this, i have the money but dont like burning it, so thinking a 50hp would be enough for what i would use it for (on a 5.3mtr) what do you think guys ??
a 5.3m rib with 50hp is going to as flat as a fart you will end up fitting a bigger motor on it eventually when I looked at this last year I was told by humber that the 75 I was going to be fitting was going to be slow
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Old 07 March 2017, 08:25   #73
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Originally Posted by breezeblock View Post
a 5.3m rib with 50hp is going to as flat as a fart you will end up fitting a bigger motor on it eventually when I looked at this last year I was told by humber that the 75 I was going to be fitting was going to be slow


absolutely nothing worse than an underpowered RIB. It will use more fuel, be potentially dangerous especially in a following sea, low resale value to name a few.
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Old 07 March 2017, 08:29   #74
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absolutely nothing worse than an underpowered RIB. It will use more fuel, be potentially dangerous especially in a following sea, low resale value to name a few.
add on to this the amount of crap women and kids need to have a day out you will spend an awful lot of the time looking skyward
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Old 07 March 2017, 12:16   #75
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https://rnli.org/what-we-do/lifeboat...class-lifeboat

What a 50 hp motor can do look in specification.
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Old 07 March 2017, 12:49   #76
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Keep your eyes on craigslist for a Yamaha 90HP 2-stroke. You should be able to pick one up that has been well cared for with (100-500hrs) for $3-5k or even less if you are lucky. I think those are about the best you could get as far as where Reliability, Weight, & Budget Meet.(Only 118kg, Well below your Max)

Bring a Compression Tester and a Battery when you go to look at it so you can turn it over. If Compression is good, you have a long lasting reliable motor.
(Giving you take well care of it)

With a 14x17 Prop, i am certain it will pick you and your family up and carry you close to 30 Knots cruising. If it so happened to be sluggish for you, 15x15 Prop on it and hold on tight cause it will take off from under you. Loosing 3-5 mph of top speed being a minor downfall.
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Old 07 March 2017, 13:03   #77
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Quote:
Originally Posted by breezeblock View Post
a 5.3m rib with 50hp is going to as flat as a fart you will end up fitting a bigger motor on it eventually when I looked at this last year I was told by humber that the 75 I was going to be fitting was going to be slow
i see what you are saying bud but a the boat has a max of 75hp with a 150kg load limit was its max i could fit. and would struggle to find a 75 under or on that weight limit, i dont need a time machine just something with a little umfhhh, i realy appreciate all your comments and great info
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Old 07 March 2017, 15:52   #78
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50hp will be gubbins on a 5.3m with 4 adults.

i don't know where this 75% of max HP is optimum came from, that is tosh IMO. the optimum is the max HP rating or as close to it as possible keeping weight limit in mind.

have you asked humber about the weight limit? i'm thinking they may have made a mistake as even a 2 stroke 75hp is going to stuggle to hit that.

i had a 5.6m with 100hp and it was a struggle to get on plane with 4 on it.
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Old 07 March 2017, 15:57   #79
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I might go against the grain here, but don't discount 2-stroke for a mid sized engine. You can always change to 4-stroke when funds allow.

Mid sized 4-strokes are nigh impossible to source second-hand - being either high hours or in poor condition, as they tend to stay with the boat. Suzuki DF70 and Yamaha F60 are great engines, well within weight limitation, frugal, but just try finding them?

The new Yamaha F70 is relatively new, supremely quiet, YCOP immobiliser technology, light and of course frugal, but I doubt you'll get one second hand.

Hey, that's just my tuppence worth.

Buy Used Outboards yamaha 2011 model, elec start, power trim/tilt 75.0HP Outboard at Bill Higham Marine

Or

Buy Used Outboards yamaha 2010 90.0HP Outboard at Bill Higham Marine
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Old 07 March 2017, 17:33   #80
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Quote:
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i see what you are saying bud but a the boat has a max of 75hp with a 150kg load limit was its max i could fit. and would struggle to find a 75 under or on that weight limit, i dont need a time machine just something with a little umfhhh, i realy appreciate all your comments and great info


You need a 90HP Yam 2 stroke, weight 120KG ......
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