sf655 southwind boat porpoising
hi
anyone own a sf655 southwind?
can anyone help with poroising problems?
i have a southwind sf655 with the 200hp yammy on the back with a hydro foil on the donk as well.
when in a little bit of choppy weather i can only get about 20knts befor it starts to porpoise(bounce at the front) with the motor trimmed all the way down. when you fill the live wells this gets worse.
i have been told to put a 5-8 degree wedge in between the motor and hull to get a little bit more trim into it, but i was also told the southwind did not need this and there must be other issuses as yamaha had tested the boat all round.
i know if i slow down solves the problem but when you see the same size boats cruise pass you there must be a way of getting a smoother ride at a faster speed.
has any one tried the wedge? or any other ideas?
thanks ron
just dhu it
Posts: 1081
Date Joined: 14/05/09
take fin off
I would suggest taking off the fin and not triming your motor out so far, the other thing to check would be your prop and then weight distribution in your boat, its okay getting the bow up , but your fin is trying to get it down and coming of a following sea you need a light bow but also one thats working as designed, my mates running a 200 yammy on his 655 sf not problems at all with out the fin
wide open
Posts: 444
Date Joined: 24/12/09
take off the hydrofoil
take off the hydrofoil see if it solves ur problems
fisho-ron
Posts: 2539
Date Joined: 26/09/09
no probs in a following sea,
no probs in a following sea, i can get the bow up a bit and its a smooth ride at the same speed, its when heading into it it gets a bit hard.
i have been told by two boat shops not to remove the foil as it will make the problem worse..
when heading out, over 20knts i cant keep the bow down, its wants to slam down on top of the waves instead of pushing through them.
if possible i would like to talk with your mate with his sf655?
cheers ron
just dhu it
Posts: 1081
Date Joined: 14/05/09
call
fisho ron , i will call him as he is not a F W memeber and see if he will talk to you about your problem. hes pretty easy going so it wont be an issue, will find out if hes in town
Decella
Posts: 401
Date Joined: 01/02/09
Not enough wieght
Check your wieght distribution. Pull your esky to the front of the boat. Sounds like all your wieght is too far back. On that hydro foil, tear if off and check the quality of ride and fuel consumtion as they create some drag in the water. Another thing to check is motor position. When I got my boat I dropped the motor down by one hole so that the motor sat deeper in the water. I lost speed 42knts down to 38knts but improved the ride by 30-40%.
Andy
Posts: 522
Date Joined: 08/10/05
motor height
I would look at dropping the motor one hole. is that fails look at a set of wedges for the engine.
fisho-ron
Posts: 2539
Date Joined: 26/09/09
thanks andy the motor is as
thanks andy
the motor is as low as it can go already, might have to try the wedges.
cheers
holth
Posts: 812
Date Joined: 09/10/06
mate l would be looking at
mate l would be looking at props.
some thing that gives the boat more stern lift.
a bigger bladed prop will do this for you.
ring around the prop shops and see what they say.
paul
fishy fingers
Posts: 1719
Date Joined: 28/04/07
Fremantle Yamaha
Why dont you give these guy's a call from memory they used to be the agents for southwind maybe they can help.
fisho-ron
Posts: 2539
Date Joined: 26/09/09
thanks fishy fingers but
thanks fishy fingers
but they have been shut down for a while now, would be good to know were they work now.
Will Trading tookover 1 part of the bussiness but no ones there knows anything about the southwinds
cheers for the info anyway
ron
Decella
Posts: 401
Date Joined: 01/02/09
Rang a mate
I asked one of my mates who fishes with a guy that has a southwind. He was saying that speed is a big factor with these types of hulls. The fella who has one has to get up quite a bit of speed to get he's "V" cutting through the water. I have to do the same with mine. Too slow and mine porposus as well. Hope this helps mate.
fisho-ron
Posts: 2539
Date Joined: 26/09/09
took the boat out today for
took the boat out today for some testing, with the foil on and placed all weight up front as far as poss i got 38knts@5200rpm, and definatly a better ride with the extra weight forward.
with the foil removed at wot 43knts@5600rpm but found it to be a little bit more unstable, also to get on the plane at a slower speed was worse.
the foil definatly makes a differance for the better?
(but dont let your mates hold the bolts for the foil because they might drop them in the water?????? not mentioning any names)
thanks to Rod for the info and ideas mate, it was very helpful. i looked at raising the motor like you said but there was no spray coming of at all, so i think the motor is at the right height.
it seems that if i play around with some extra weight forward might solve the problem.
also i am proberly expecting a little bit to much out of what i got anyway,,,,, i just want to start fishing quicker!
thanks to everyone
Cammos
Posts: 606
Date Joined: 30/06/09
Rod @ Boatshack
Sounds like you have got him already, but if not try Rod in Joondalup. He seems to know these Southwinds. I am interested to hear what you say because I am picking up my new (2nd hand) SF20 (almost the same as SF655) next week from.......you guessed it.......Rod at Boatshack. Mine has the 200hp Yammie too, maybe we should race?
fisho-ron
Posts: 2539
Date Joined: 26/09/09
hi cammos yer i was talking
hi cammos
yer i was talking to rod about your boat yesterday, he knows his stuff.
i would love to hear from you once you get it to see what you think. i think you will love it.
i have been happy with mine since i got it, i just wana go faster!!!
RACE sounds good if its out to a fishn spot.
good luck with your new boat and stay intouch.
ron
Faulkner Family
Posts: 18084
Date Joined: 11/03/08
you could try it with less
you could try it with less trim and getting the front down a bit so it will cut through the water instead of bouncing off it , had a similar prob with a 18foot fraser.
RUSS and SANDY. A family that fishes together stays together
Wreckless
Posts: 92
Date Joined: 02/11/09
I have seen simillar problems with long narrow hulls before
I would ditch the wing and install a set of trim tabs. This will allow you to trim the motor out and drop the tabs to lift the arse..........should sort your prob. I doubt that the prop is in any way affecting .
Mick