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Old 14 February 2003, 05:23   #11
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Country: UK - England
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Make: Scorpion 8.5mtr
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Jack Plate

Manos

I agree with you, Skip the Jack plate. Most of the races over here are not donein flat calm conditions so you will need the engine down to give you the grip from the prob and to keep the bow down when the going gets rough. I didn't see many race ribs with jack plates last year so save the money.

Julian
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Old 14 February 2003, 06:48   #12
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Country: Greece
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Re: Jack Plate

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Originally posted by Julian
Manos
I agree with you, Skip the Jack plate. ........so save the money.
I am doing exactly that
Cheers Mate
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Old 19 February 2003, 00:35   #13
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I am building a 28 foot rib out of aluminium with twin 250 yamaha's. this vessel has jack plates. we had to install low water pickups to make the jack plates worth while. we r able to turn a higher pitch and larger diameter prop. the boat should be sea trialed in a week or two so i will let you know how it went.
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Old 19 February 2003, 03:03   #14
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Quote:
Originally posted by eksrae
the boat should be sea trialed in a week or two so i will let you know how it went.
Will be very interested to know what you think of the jack plates.
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Old 23 February 2003, 15:36   #15
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her is a picture "hopefully of the jackplates. they are rated to 300 horse. that is twin 250 yamaha's. the legs will be installed tomorrow.
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Old 23 February 2003, 15:43   #16
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Is that a Delta keel I spot there Eksrae? looks a good job.
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Old 23 February 2003, 15:56   #17
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sure is. gotta have them
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Old 23 February 2003, 16:09   #18
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Look forward to seeing a few pictures when she is done.

Im interested in Ali boats as there a very few manufactures over here who specilise in Ali ribs.

Its a specilist field and those over here who have them swear bye them,500hp on a 28ft boat Ali boat will make her fly with the Delta keel so Im interested and any imfo as it will be much appreciated.

When your ready and good luck although by the look of her you arnt going to need any.
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Old 24 February 2003, 10:05   #19
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HI Crazyhorse et al
Please can you explain the delta hull?
I was thinking that delta power up north made the hull, but subsiquent posts have shown (that I can't spell &) that I was wrong !
so whats a delta hull design look like ? and why is it so good?

I aggree with the comments on alu hulls as I was trying to get the offshore work boats made in alu as it was easier to weld up alu offshore that do a decent kevlar/fibre composite repair.
Jelly
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Old 24 February 2003, 13:59   #20
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Hi Jelly,The Delta keel is a design that I have only ever seen in Canada where these boats are used each day , they have become very sort after and it is something quite new to us over here.

It gives a rib lift, even though you have Deep V it is situated aproximatley 1/3 the way back and goes to the Transome.

It is the bit the boat rides on when it planes as with a very deep V you need more HP to push it as fast as you suffer from drag I.E wetted surface area when you dont want it,and you can get chine walk.But a deep V has the ride in rough weather so this enables the boat to have a deep V when needed and a Nice Delta surface when you dont. Its all about position to the waves a flat bottom will slam a deep V will not.

Its a design compromise that in concept gives more lift for less HP and consequently gives you a more stable attitude to the waves and increases speed and stability whilst achieving a deep V when required.

I can only go off my instinct and what has been confirmed in CAD testing but Eksrae can tell us more from the actual Sea trials point of view and what the costomers have found.

Hope this helps.
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