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Old 28 December 2017, 17:51   #1
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70mph smallest option ideas

So hypothetically what’s the smallest realistic set up for 70mph on flat water decent sea keeping capability in smallest package 5m 150hp? 6m 200hp?


What would give 100 mile cruising range, 70mph top end, 3+ seating under £6k used but good nick
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Old 28 December 2017, 18:16   #2
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A RIB?...
Ali Babba may have somthing in you're Price range..if you don't mind a Carpet!
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Old 29 December 2017, 01:40   #3
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Love your optimism

I think your only hope here is a big jet ski and forget the 100ml range and "sea keeping" qualities.

Personally......... I'd "can" the 70MPH idea as the sea's not going to let you do that very often anyway, and the machinery alone to propel anything bigger than a jetski at that sort of speed will be more than your budget.
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Old 29 December 2017, 04:17   #4
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Back to the drawing board then.....
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Old 29 December 2017, 05:15   #5
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Not for the faint hearted going 70mph on water, the OCR lads will tell you that
https://youtu.be/RaNiug4vHD8
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Old 29 December 2017, 06:00   #6
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Back to the drawing board then.....
As mentioned many jet skis will easily hit 70mph with the right sea conditions ( and not all skiers are ar*eholes ), another option is a ring or phantom 18-21ft, they will hit the 70's with the right lump pushing them - and can be had for a few thousand
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Old 29 December 2017, 06:07   #7
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As mentioned many jet skis will easily hit 70mph with the right sea conditions ( and not all skiers are ar*eholes ), another option is a ring or phantom 18-21ft, they will hit the 70's with the right lump pushing them - and can be had for a few thousand
On the back of what fender says there are a few ribs built on ring/phantom style hulls which might get close to those speeds first I can think of is flatacraft force 5 built on the phantom hull
An older boat like that with a large ageing 2 stroke engine would probably come in close to budget but range and reliability will be the issue
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Old 29 December 2017, 06:24   #8
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Click image for larger version

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18ft 9” and a genuine 75mph, 90l tank will not give you a 100 mile range though
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Old 29 December 2017, 06:26   #9
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Attachment 123049

18ft 9” and a genuine 75mph, 90l tank will not give you a 100 mile range though


Like the colour scheme on your Ring 18, I have the same in a Ring 21
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Old 29 December 2017, 09:26   #10
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50mph does that open a few more options....while I would love a ring sen a ring based rib.... that isn’t going to fit down the side of the house.....

https://www.theyachtmarket.com/boats_for_sale/1519046/
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Old 29 December 2017, 09:35   #11
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As mentioned many jet skis will easily hit 70mph with the right sea conditions ( and not all skiers are ar*eholes ),
wouldn’t go that far......

I was wondering if there was something that could offer similar performance but better range hitch I could launch closer to home.....
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Old 29 December 2017, 09:38   #12
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50mph does that open a few more options....while I would love a ring sen a ring based rib.... that isn’t going to fit down the side of the house.....

https://www.theyachtmarket.com/boats_for_sale/1519046/


I might consider selling my Ring 21, pm me if your interested
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Old 29 December 2017, 09:41   #13
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I might consider selling my Ring 21, pm me if your interested
Thanks but somewhat larger than I was looking at. Would be fun though......
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Old 06 January 2018, 05:14   #14
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50 mph is more attainable. That's about 44 knots. 5.5 to 5.8 with 130 to 150 would achieve that depending on hull choice. Some ribs are faster than others. Should manage your 100 mile range at cruising speeds if it has between 100 and 120l tank.
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Old 06 January 2018, 06:03   #15
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I might consider selling my Ring 21, pm me if your interested

Standards please!
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Old 06 January 2018, 08:40   #16
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Zapcat (or similar)?
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Old 06 January 2018, 10:16   #17
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Zapcat (or similar)?
Was going to suggest a thundercat, takes a lot of work to reach 70mph though.
Fairly easy to get to 55mph or even 60
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Old 06 January 2018, 12:54   #18
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50 mph is more attainable. That's about 44 knots. 5.5 to 5.8 with 130 to 150 would achieve that depending on hull choice. Some ribs are faster than others. Should manage your 100 mile range at cruising speeds if it has between 100 and 120l tank.
Interesting thanks.....are shallower v hulls faster or does it not work like that?
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Old 06 January 2018, 13:14   #19
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Interesting thanks.....are shallower v hulls faster or does it not work like that?


The smaller the v / shallower the hull the less effort it takes to move it through the water so for any given engine a shallow v will be quicker. If there is a planing pad then (if) once the whole boat is skimming along on that then the difference between hulls will be about weight - typically deeper v hulls also being build stronger for tougher seas.
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Old 06 January 2018, 15:05   #20
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With a bit of shopping around it could be done on half the budget.

As beamishken said, the Phantom 16 based Flatacraft Force 5 would be the best hull, lots of these were sold as sports boat seating, remove all that and fit a single jockey console rearwards. (Btw these are a massively underrated boat and vastly superior than the hateful Avon searider!)

Either a Yamaha v4 130, Jacked up with a Laser 2 20 or 22” you should be upward of 60mph. A 2litre merc V6 would do over 70mph.
Look at spending £500 on 2nd Hand seastar steering and a cheap foot throttle.
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