Stability?
Submitted by Paul200990 on Sun, 2019-07-14 13:44
hey guys,
took the project boatbot out on the water this morning, went well but a few thing I need to get my head around.
stability: the boat is pretty much empty. No fuel
tank in it or anything. Just engine and me and my othe rmate who came out this morning with me prob 150kg combine. We found that the boat is a good sea riding hull but I think it’s lacking in the stability region.
not sure that it’s pretry much a empty hull with a 170kg engine on the back only wouldn’t help it’s cause.
would love to get people thoughts and experiences on this and if they think when I add the 250l fuel tank in it that it all. The hullnis 6.2m 7.3LOA. 6mm bottom, 5mm side and transom with steel bar rolled keel
help
Image Upload:
Faulkner Family
Posts: 18055
Date Joined: 11/03/08
extra weight will put the
extra weight will put the boat a bit lower in the water. the stability you mention , is it while driving or stationary. if while driving trim tabs would help
RUSS and SANDY. A family that fishes together stays together
Paul200990
Posts: 290
Date Joined: 22/05/19
Yes trim tabs are a must but
Yes trim tabs are a must but mainly at rest
Faulkner Family
Posts: 18055
Date Joined: 11/03/08
extra weight in the hull may
extra weight in the hull may help a bit as i said it will sit lower in the water. only speaking from my experience but i have only owned glass boats
RUSS and SANDY. A family that fishes together stays together
meglodon
Posts: 5981
Date Joined: 17/06/10
When you talk stability
What exactly is it that is causing you concern, when you are at rest is the boat healing over at an alarming angle when you move over to one side with one or two people.
Is the boat at rest moving around wallowing (side to side movement) when you walk around the deck.
Is the boat pitching ie; when moving forward or aft to a great degree which is inconsistent with the amount you expect with the weight movement, bow diving or stern dipping when moving aft
From the photo (2) the boat seems to be sitting down on the chines in the water which to me is where they should be, just my opinion.
Paul200990
Posts: 290
Date Joined: 22/05/19
It was just listing over
It was just listing over while travelling and a lot of listing at rest when walking around the cabin.
drove well and cut through the water nicely. Just was abit unstable at rest and more listing than I am use too.
Paul200990
Posts: 290
Date Joined: 22/05/19
Just added two more photos.
Just added two more photos. Not the best but you can sorta see how high it sits and also from the transom, how much does get exposed when rocking.
Crikey
Posts: 41
Date Joined: 25/03/10
That hull looks similar to
That hull looks similar to the old dolphin hull I had. Steering position well forward. When 2 or 3 people are are forward it was very unstable particularly in a following sea. When the Esky and people were at the rear it was fine. You can also trim the motor up a little also to help lift the bow up.
Paul200990
Posts: 290
Date Joined: 22/05/19
Yeah the boat is built by
Yeah the boat is built by Milton rear and Dave Jackman designed.
Milton is one of the founders of sea quest/razerline and assassins.
he built this boat after he retired for my supervisor at work in 2005.
its an unofficial assassin. Spoke to him on the phone about it and confirmed that it is an assassin design
z00m
Posts: 1086
Date Joined: 10/05/14
Weight is as used
You should put the weight in it that it would normally have before you sea trial like that. If you want to ckeck it before you commit to building tanks and fitting it out then use water barrels.
Think about how bar crusher ads a lot of ballast water to their hulls when in the water so they are more stable. I think you'll find as you add the correct weight to it like interior fitout, fuel tanks (not just the fuel), safety gear, wiring, electronics, esky etc you'd be up another couple of hundred kg and then your fuel, water and passengers would all add more.
Paul200990
Posts: 290
Date Joined: 22/05/19
Yeah for sure, I was just
Yeah for sure, I was just curious on how it went in the water today. Likes it a lot. Sounds abit hollow but that’s to be expected
sunshine
Posts: 2622
Date Joined: 03/03/09
Might want to consider a flooding kill tank
Adds heaps to stability at rest and drains very quickly as you take off through venturi action if pipe feeding it is large enough. I run a 6.8 seaquest but the kill tank has a threaded bung so we can use the area as dry storage if heading out to the islands
Paul200990
Posts: 290
Date Joined: 22/05/19
Hey sunshine, can you pm me a
Hey sunshine, can you pm me a pic of your boat layout if you have one. Trying to work out where I can put my kill also tank and curious on the difference with the deck design to mine. I don’t think there would be much difference since it’s built by the same people
sunshine
Posts: 2622
Date Joined: 03/03/09
Kill tank located centrally between the seats
i don’t have a photo on the iPad (only the outside after complete respray) but will look on the main computer when I get a chance. It floods quickly and stabilises the boat brilliantly when drift fishing
Paul200990
Posts: 290
Date Joined: 22/05/19
Hey sunshine, can you pm me a
Hey sunshine, can you pm me a pic of your boat layout if you have one. Trying to work out where I can put my kill also tank and curious on the difference with the deck design to mine. I don’t think there would be much difference since it’s built by the same people
Nelly
Posts: 518
Date Joined: 04/05/08
More weight will get the
More weight will get the chines sitting in the water making it more stable.Looks quite high out of the water in the photos.
Paul200990
Posts: 290
Date Joined: 22/05/19
Yeah that was my thought too.
Yeah that was my thought too. Sat real high
Rob H
Posts: 5806
Date Joined: 18/01/12
Im confused!
Im confused
This boat bought as a project,
then for sale,
then talked out of selling by a mate
then did a shoulder and was for sale again
Now it pops up with the same owner doing seatrials...
Cant keep up haha!
Give a man a mask, and he'll show you his true face...
The older you get the more you realize that no one has a f++king clue what they're doing.
Everyone's just winging it.
Paul200990
Posts: 290
Date Joined: 22/05/19
Haha yeah me either.My mate
Haha yeah me either.
My mate wanted to take it out and see how it went after I got the engine going.
hit the water nice :( now he is on my case about keeping it and putting a 200 on it
now :(
Paul200990
Posts: 290
Date Joined: 22/05/19
I got my eye on a nice
I got my eye on a nice seafarer vagabond hha
dodgy
Posts: 4578
Date Joined: 01/02/10
You forgot the bit about
You forgot the bit about cutting the roof off to make a centre console.
Does anyone know where the love of god goes, when the waves turn the minutes to hours?
holth
Posts: 812
Date Joined: 09/10/06
Ha. Was trying to sell the
Ha. Was trying to sell the hard top separately also. I see your mates selling your quintrex on your behalf now.
Paul200990
Posts: 290
Date Joined: 22/05/19
Yeah I don’t have social
Yeah I don’t have social media and he is on many more fishing pages than my misso
rob90
Posts: 1528
Date Joined: 06/02/13
Dont forget hard top for
Dont forget hard top for sale then pulls ad, then back up as combo sale with other boat then pulls ad then back up as loa 7.2 ali for sale. Haha cant keep up either
Hi my name is rob............. and I'm a........... fishaholic
Paul200990
Posts: 290
Date Joined: 22/05/19
That’s what happens when you
That’s what happens when you are adhd :) can’t make my mind up. Always have ideas
meglodon
Posts: 5981
Date Joined: 17/06/10
As alluded too above
I think when you get the bits and pieces added to the hull you will find that the hull will settle down to a very nice stable hull. The second lot of pics show it ridding with the chines just clear of the water line more weight will fix that, it looks like you have a great boat and should have some great times on the water.
Paul200990
Posts: 290
Date Joined: 22/05/19
Yeah maybe. Thinking of
Yeah maybe. Thinking of selling it, got shoulder surgery coming up and time after that to heal.
scubafish
Posts: 962
Date Joined: 15/08/12
Shoulder
just had that done,rotator cuff 6 weeks before sling to comes off,up to 4/6 months physio.
lot of sleepless nights and drugs.
Regards boat,250lts (250kg) in middle of the boat will make a big diff basically that's 2 adults and 1 child as far as weight goes.centralizing the weight will work and make a big diff.
Have read somewhere that weight difference between ali and fiberglass is completely diff up to about 20ft,then it becomes similar.
There is a mathematical equation to get it right as far as water displacement and weight goes,also where the weight should be as far as front or back.
Trim tabs will assist in stabilization when moving and not at rest.
http://img.gg/BQ91Sys
Paul200990
Posts: 290
Date Joined: 22/05/19
Yeah this will be my second
Yeah this will be my second reco on the same shoulder. Worst pain I have ever been in after surgery.
Yeah im hoping so. Just gotta get the chines in the water abit more but im
thinking once I put both batteries in there. A new 4 stroke (40kg) more than 2 stroke that’s on it now and then the fuel tank and everything else plus the trim tabs it should make a a huge difference. But can I be stuffed to do that is outweighing my thought of keeping it especially after the reco
Swompa
Posts: 3900
Date Joined: 14/10/12
The boat will have been
The boat will have been designed to accomodate a fair bit of kit in the back such as the fuel, another battery, deck wash and so on. If the boat is empty, it won't be maximising its beam and be balancing on whichever side of them has the most beam. Essentially it is trying to be a Trimaran.
My former brother in law purchased a copy of a Chivers 6.5maluminium build and at speed, it would flop from chine to chine. Needed more weight in the back to give it some displacement.
More weight in the boat will have it digging far more of a trench and give you a hell of a lot more stability.
Think about 150 kg ingots along the keel that can be removed if you go out full. Right down against the hulli/keel line to keep centre of gravity low. You wouldn't have the first boat to need ballast.
Rob H
Posts: 5806
Date Joined: 18/01/12
Chine walking is the term
Chine walking is the term for this
Give a man a mask, and he'll show you his true face...
The older you get the more you realize that no one has a f++king clue what they're doing.
Everyone's just winging it.
Swompa
Posts: 3900
Date Joined: 14/10/12
Didn't know it was a thing!.
Didn't know it was a thing!. There ya go!
Paul200990
Posts: 290
Date Joined: 22/05/19
I don’t think the hull was
I don’t think the hull was deep enough in the water for the chines to properly do there thing hahha
holth
Posts: 812
Date Joined: 09/10/06
I'm more confused, it reads
I'm more confused, it reads you dont have the fuel tank in it? Does it in those pics.
If that's the case lm not surprised its arse is still out of the water
Paul200990
Posts: 290
Date Joined: 22/05/19
Nah no fuel tank. Running
Nah no fuel tank. Running the engine off a jerry can to tear it out. But I was curious to how much the fuel tank would help
holth
Posts: 812
Date Joined: 09/10/06
You selling the fuel tank?
You selling the fuel tank?
Paul200990
Posts: 290
Date Joined: 22/05/19
It came with a 140l poly
It came with a 140l poly fuel tank. If I re power if I’m go n put a 200 on and gonna get a 350l one made up
But will sell the poly one if you want it
holth
Posts: 812
Date Joined: 09/10/06
Haha. Nah, you mite need it
Haha. Nah, you mite need it if your selling the boat.
Paul200990
Posts: 290
Date Joined: 22/05/19
Yeah only rippped it out to
Yeah only rippped it out to have a look in the hull and transom