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Old 29 January 2010, 08:53   #11
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I had the use of a friend's 19ft Boston Whaler with a 200hp Optimax all of last summer. The ride in a head sea is pretty awful, following seas it coped with much better. It was definitely a handful in anything other than flat calm though, but then it is overpowered by 50hp and I'm very throttle happy

Great boat for messing around in though, more useable deckspace than a similarly sized RIB and will plane very easily even with a very heavy load. Not as fast as a similarly sized RIB though, she topped out at 48ish knots. Not bad for a fishing boat though! haha
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Old 29 January 2010, 08:57   #12
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It was definitely a handful in anything other than flat calm though,
I with you on that one, very tiring..
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Old 29 January 2010, 11:39   #13
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At the other end of the scale, an 11' dory / 25 Hp.

As has been said before, nightmare in anything above a small ripple, but goes like a rocket in the flat stuff whilst using naff all fuel (even with a 38YO engine), and has about an acre of deck space considering it;s not much longer than a Mirror dinghy.... Also good for beaching due to the flat bottom.

Bought the rib 'coz I reckoned it would be cheaper than a steady supply of gum shields!
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Old 31 January 2010, 13:13   #14
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RIB man now.. but...

I once was a dory man, had an 11ft Dell quay with a 25hp mariner, most reliable outfit I ever had. Used to go out in force 7s and follow the ferry to the IOW from Southampton, very painful on the back on the wooden thwarts, but great fun, and low fuel use. Similar sized Avon S3.45 not much more sea worthy.. 4m Searider much better deep v hull.

Equally had use of a 185hp Seadoo Jetski last summer, it drank fuel and was rubbish in rough stuff but excellent for wakeboarding.

Buy a RIB does everything better, but then I did have an 8.4m Searider with 400hp on tap and was a little spoilt.

Most fun to be had is a 4m searider with a 50hp 2 stroke! 35 knots and excellent fuel economy
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Old 31 January 2010, 13:50   #15
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lots of folk on here really seem to rate the 4m seariders. was looking at one for sale today with a 50 mariner on the back looked ok but was 3 grand, its lying at ardfern marina if anyone wanted to view it. thanks for all the input btw.
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Old 31 January 2010, 16:19   #16
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I with you on that one, very tiring..
oi you! that was a fun day out,
but you were quite happy to get rag worm all over my dory mate
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Old 01 February 2010, 04:00   #17
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Time to plane and fuel burn

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Originally Posted by BassBoy View Post
Hector
I have owned a 13ft Dory, a 17ft Boston Whaler and now a 6m RIB.

Without question, the RIB is by far the most 'useable' boat in any kind of seaway.

However, a cathedral hull will produce more lift more quickly and therefore will require less hp than an equivalent sized RIB to plane.

A reasonable compromise might be a catamaran. Used for years and years by small commercial operators, they are becoming more popular in the leisure market.
Hulls which are flatter at the stern get on to the plane more quickly and take less hp for the same speed as hulls with more angled surfaces - for the same overall weight. The downside is that they don't perform as well and can't be driven as fast in the rough. Long thin hulls are more efficient, but for different reasons, which is why cats take less hp for the same speed. Cats roll less of course, so can give a hard ride. RIBs are a pretty good compromise for most things, but the deep V hulls can take a lot of hp for a good speed - particularly if the boat is quite heavy.

One trick to get a deep V hull onto plane quickly, give a (very) good performance and low fuel burn at lower speeds is a wide flat keel. The Eco XR24 has a "planing wedge" - basically a long triangular flat at the end of the keel, which works very well. The boat was originally designed for both diving and racing! Although not shown on the website www.eco-marine.co.uk a wheelhouse/ cuddy has been designed. There's a picture here: http://rib.net/forum/showthread.php?...ht=xr24&page=2
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Old 01 February 2010, 14:54   #18
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oi you! that was a fun day out,
but you were quite happy to get rag worm all over my dory mate
wondered how long it would take the dory lover to appear
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Old 01 February 2010, 14:57   #19
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hector, have a look at these links...

http://rib.net/forum/showthread.php?t=30703

http://rib.net/forum/showthread.php?t=31814
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Old 01 February 2010, 15:45   #20
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first linky vid not work
try these.



Quote:
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wondered how long it would take the dory lover to appear

although i do love my little dory and have had a lot of fun in it,
its no match for a rib in the chop.
last summer both my and jizm went across the solent to the IOW for the day,
on our return the weather had turned to about a force 4
which was no problem for his 5m rib but bloody hard work in my same sized dory!
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