MtB Posted September 15, 2018 Report Share Posted September 15, 2018 My boat is a bit low in the water at the back and a bit high at the front. There is no ballast in the stern to remove. If I add ballast to the front will this bing the back up slightly? Or will the bow simply sit a bit deeper? I can convince myself either way so would appreciate the thoughts of the team. Link to comment Share on other sites More sharing options...
TheBiscuits Posted September 15, 2018 Report Share Posted September 15, 2018 Helium Balloons tied to the tiller. You may need a few of them ... Link to comment Share on other sites More sharing options...
StephenA Posted September 15, 2018 Report Share Posted September 15, 2018 I think it just takes the front down.... Link to comment Share on other sites More sharing options...
Rob-M Posted September 15, 2018 Report Share Posted September 15, 2018 I don't think you will notice much difference at the stern. If I go from empty to full water tank it takes the bows down but didn't effect the stern. Link to comment Share on other sites More sharing options...
TheBiscuits Posted September 15, 2018 Report Share Posted September 15, 2018 (edited) 18 minutes ago, StephenA said: I think it just takes the front down.... So does @Furnessthere was a recent discussion about loading the first 18 tons at the front of a coal boat to lower the nose without lowering the stern. Edited September 15, 2018 by TheBiscuits Link to comment Share on other sites More sharing options...
MtB Posted September 15, 2018 Author Report Share Posted September 15, 2018 11 minutes ago, TheBiscuits said: So does @Furness - there was a recent discussion about loading the first 18 tons at the front of a coal boat to lower the nose without lowering the stern. Good point, I remember his comment. Wasn't it @furnessvale though? Link to comment Share on other sites More sharing options...
TheBiscuits Posted September 15, 2018 Report Share Posted September 15, 2018 3 minutes ago, Mike the Boilerman said: Good point, I remember his comment. Wasn't it @furnessvale though? Oops yes! Link to comment Share on other sites More sharing options...
Ex Brummie Posted September 15, 2018 Report Share Posted September 15, 2018 If I fill the water tank from 1/4 full, the stern rises 1 1/2" - 2", whilst the bow drops 3"- 4". The quantity of water is about 170 gallons. Link to comment Share on other sites More sharing options...
nb Innisfree Posted September 15, 2018 Report Share Posted September 15, 2018 It will seesaw around the centre of gravity. 1 Link to comment Share on other sites More sharing options...
Stilllearning Posted September 15, 2018 Report Share Posted September 15, 2018 35 minutes ago, nb Innisfree said: It will seesaw around the centre of gravity. This was my experience on last but one boat, that had a very large water tank. From empty to full dropped the bow by about 8” and raised the stern by about 2”. Link to comment Share on other sites More sharing options...
IanD Posted September 15, 2018 Report Share Posted September 15, 2018 (edited) 2 hours ago, nb Innisfree said: It will seesaw around the centre of gravity. No, it'll seesaw around the centre of flotation, which is usually not the same place as the CoG. But this is only exactly true if you move a weight in the boat, if you add weight to one end the CoG shifts as well, so the seesaw point is somewhere between CoG and CoF. Edited September 15, 2018 by IanD Link to comment Share on other sites More sharing options...
Movin' on Posted September 15, 2018 Report Share Posted September 15, 2018 (edited) 4 hours ago, Mike the Boilerman said: My boat is a bit low in the water at the back and a bit high at the front. There is no ballast in the stern to remove. If I add ballast to the front will this bing the back up slightly? Or will the bow simply sit a bit deeper? I can convince myself either way so would appreciate the thoughts of the team. Why not get a few friends to stand on the bow and see what happens every boat is different Edited September 15, 2018 by Halsey Link to comment Share on other sites More sharing options...
dmr Posted September 15, 2018 Report Share Posted September 15, 2018 Exactly as Ex Brummie says, filling our tank from 1/4 to full (1000 litre tank) does exactly the same, maybe 6 inches down at front and about 2.5 up at the back. I use the rudder visible above the waterline as a quick measurement of tank water level. ...............Dave Link to comment Share on other sites More sharing options...
Mike Todd Posted September 15, 2018 Report Share Posted September 15, 2018 3 hours ago, nb Innisfree said: It will seesaw around the centre of gravity. Not entirely if you are adding extra weight to the total. Link to comment Share on other sites More sharing options...
alan_fincher Posted September 15, 2018 Report Share Posted September 15, 2018 5 hours ago, Mike the Boilerman said: My boat is a bit low in the water at the back and a bit high at the front. There is no ballast in the stern to remove. There is though - it's called a K2, (or a Glennifer, or whatever). Put in a nice sensible modern engine, and you probably will need ballast at the stern! Link to comment Share on other sites More sharing options...
nb Innisfree Posted September 15, 2018 Report Share Posted September 15, 2018 (edited) 2 hours ago, IanD said: Deleted because I can't be bothered to discuss! Edited September 15, 2018 by nb Innisfree Link to comment Share on other sites More sharing options...
Up-Side-Down Posted September 15, 2018 Report Share Posted September 15, 2018 9 hours ago, Ex Brummie said: If I fill the water tank from 1/4 full, the stern rises 1 1/2" - 2", whilst the bow drops 3"- 4". The quantity of water is about 170 gallons. That would be pretty much my experience with a 60' boat. For a more extreme outcome, to enable me to paint the stern bands and the rubbing strip above the uxter plate, I put a couple of IBCs on the tug deck and filled them with water, thereby raising the stern well clear of the water. So, yes, I think you could achieved your desired result Mr Boilerman. Link to comment Share on other sites More sharing options...
Neil2 Posted September 15, 2018 Report Share Posted September 15, 2018 With Mike's boat I suspect you have a double whammy of a big heavy engine and a long swim which reduces buoyancy at the stern. Boats with long swims are harder to trim because of the buoyancy issue and the lack of movable ballast. I reckon by the time you have added enough ballast to get the trim right, the entire boat will be unreasonably low in the water. Link to comment Share on other sites More sharing options...
IanD Posted September 16, 2018 Report Share Posted September 16, 2018 On 15/09/2018 at 16:31, nb Innisfree said: Deleted because I can't be bothered to discuss! You prefer alternative facts, then? ? Link to comment Share on other sites More sharing options...
WotEver Posted September 17, 2018 Report Share Posted September 17, 2018 On 15/09/2018 at 10:10, Mike the Boilerman said: My boat is a bit low in the water at the back and a bit high at the front. There is no ballast in the stern to remove. Move the engine forwards... Link to comment Share on other sites More sharing options...
MtB Posted September 17, 2018 Author Report Share Posted September 17, 2018 49 minutes ago, WotEver said: Move the engine forwards... I'd prefer to keep it in the engine room... Link to comment Share on other sites More sharing options...
WotEver Posted September 17, 2018 Report Share Posted September 17, 2018 39 minutes ago, Mike the Boilerman said: I'd prefer to keep it in the engine room... Much prettier in the saloon. You could sit and polish it. Link to comment Share on other sites More sharing options...
MtB Posted September 17, 2018 Author Report Share Posted September 17, 2018 38 minutes ago, WotEver said: Much prettier in the saloon. You could sit and polish it. That would make the bow too low... Link to comment Share on other sites More sharing options...
X Alan W Posted September 17, 2018 Report Share Posted September 17, 2018 Suggest you adopt the suck it & see policy put weight in the front end & observe result no Idea about now but in the days of a definitive channel having the boat ballasted/loaded to be "down by the head"fore end lower by 1to2 inches improved steering & channel following counter just flat on standing still aids "chucking back"reversing with minimum cavitation& requires less time /throttle to suck down & motor away with min cavitation probably a no go now days with shorter than full length boats with a draft that will float on damp grass+the lack of dredging Link to comment Share on other sites More sharing options...
MtB Posted September 17, 2018 Author Report Share Posted September 17, 2018 (edited) 1 hour ago, X Alan W said: Suggest you adopt the suck it & see policy This is my only option really. It's just that acquiring say 3cwt of Avery weights at £25 each to try it is gonna cost £150, and quite a lot of effort getting them to the boat. Edited September 17, 2018 by Mike the Boilerman Arithmetic! Link to comment Share on other sites More sharing options...
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