opinions on reverse chines please
I'm looking at replacing my pressed Mako Dory 460 (plate sides, but you know what I mean) with a plate dinghy.
Chasing a sealed floor mainly, for peace of mind flotation wise.
Question is this,
There's a few plate designs getting around now with pronounced reverse chines. They look very nice indeed and look as though they would offer excellent stability, and combined with a reasonable deadrise at the stern, would be a good ride in a bit of slop.
I don't know if I'm over analyzing this, but would the reverse chines make the hull ride harder than without the chines?
It seems to me that on a good impact, the hull would come to a quicker stop once the chine line is met, rather than pushing through and using the bouyancy of the hull to halt the downward force.
Like I said, am I nit picking here?
There's a bit of conflicting opinion on this on various sites. Just hoping someone here could add a bit of real life to my theorizing.
Cheers, Craig.
JohnF
Posts: 2838
Date Joined: 07/07/10
Yep, bigger reverse chimes
Yep, bigger reverse chimes the harder the ride but more stability. Always trade offs with boats unfortunately.....
Boston Whaler 235 Conquest......getting the flogging it was built for.
Swompa
Posts: 3901
Date Joined: 14/10/12
Reverse chine makes the
Reverse chine makes the water think that the boat lighter displacement than it actually is, which great in some aspects, ie flat water, with fuel economy, though riding higher in the water will leave you more susceptible to slamming, like lighter pressed boats.
quest
Posts: 248
Date Joined: 03/08/15
It's a compromise
It's a compromise when it comes to mono hulls. A deep V hull rides well, but is sloppy at rest and a shallow V hull pounds hard in the chop but is nice and stable when at rest. I think the reverse chines helps the deeper V hull to be more stable at rest, but the bigger the chines the harder it rides due to hitting the water. A compromise. Twin hulls are the best of both worlds if you can afford it, however they too have some down falls. Look at the air rider hulls, they are the ducks nuts but again you have to put your hand in your pocket real deep.
JohnF
Posts: 2838
Date Joined: 07/07/10
Even the air riders have
Even the air riders have their issues......
Boston Whaler 235 Conquest......getting the flogging it was built for.
carnarvonite
Posts: 8673
Date Joined: 24/07/07
Not Wrong
When looking for our new rescue boat we took a 10 metre Air rider for a run to do a comparison to a 10 metre Naiad, no way in the world would we go for the Air rider.
Speaking to the blokes at Denham sea rescue, they would have had us leave our boat there and take their Air rider home when we were down there recently for a training weekend.
dodgy
Posts: 4578
Date Joined: 01/02/10
But still plenty of groups
But still plenty of groups have no issues with their Airriders.
Airrider is a much more practical platform for a fishing boat too.
Does anyone know where the love of god goes, when the waves turn the minutes to hours?
Rob H
Posts: 5806
Date Joined: 18/01/12
Airider
we had one at work here, not sure if its still around or not, 8 or 9 meters.
Plenty of problems, Adam knows all about it!
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.
epic restos and...
Posts: 226
Date Joined: 22/06/15
that is really a hard one to
that is really a hard one to answer and in all true context there really is not a diffined answer. everyone has there own opion as to wether glass or ali the question is endless, all i can say is that i have refined my hulls over the years and have many different designs,large reverse chins ,sharp dedrises, low dedrisers,built on chines step chines and more. the thing i have found is that (and this is only my opion ) that many boatowners get caught up in the hebi geebe of the new toy theme. people think staility is an offshoot to NEED BIGGER CHINES but in my researce it does not have a higher percentage of performnce over your standard hull.weight displacement and balance is the key to a great riding hull and rock solid platform at rest. address these points 1st and your on a winner.just an opinon
Rob H
Posts: 5806
Date Joined: 18/01/12
short answer is yes and the
short answer is yes and the term your probably needing is "effective deadrise" which is from keel to outer chine, not measured at the select area between keel and another point.
here is a really good write up by a local Naval Architect on the subject.
And a nice range of designs as well
http://www.sherwoodmarine.com.au/kit-boats/technical-info/
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.
craig scott
Posts: 114
Date Joined: 16/10/10
Thanks for the
Thanks for the replies.
Informative stuff thanks.
Rob that link was very useful, a good read like you say. Answered my question straight up.
Cheers, Craig.
ranmar850
Posts: 2702
Date Joined: 12/08/12
EVERY SINGLE BOAT is a compromise
As someone says above, all boats are compromised. NOTHING, regardless of what owners/fanbois/salesmen will tell you, does everything. Always a tradeoff. Think the biggest glass yank boats are the ultimate machine? Limited to a ramp and you'll probably need to go to a yank tank to tow it, with resultant cost of ownership and you won't be parking it in the city or at Target. Twin hulls can have some terrifying habits, just google Cat Capsize or similar. Deep vees can very tender at rest, don't be crowding four people along a gunwhale on most of those "revered" old seventies hulls to look at your capture if there is a side slop running. But the travelling was great. You could do that safely with my old Quintrex Navigator 600, but that flat arse that gave the stability also gave a hard ride into a short sea. Wide chines help with stabilty but give more bang. Weight can help with ride, but needs more horsepower to push and trail. Centre Consoles are the ultimate fishing machine, but no weather protection, cuddy cabs have weather protection but less fishing area. Runabouts are the worst of both, F*all weather protection and you are standing too far forward for ride. Some Haines and Seafarer models are absolutely renowned for diving into the wave in front on a following sea and putting green water over the wavebreaker and into the cockpit but are still rated highly for their ride. My Dominator was designed to be a compromise, fine entry for ride into a short chop with a shallower deadrise at the stern than was fashionable at the time. Worked well, but not as soft as a deep vee in bluewater weather. Just keep the bow trimmed down and weight forward and it does well, never a bad moment.
And almost every hull has a story to it, weight distribution, trim, you'll work out what makes it work best regardless of how others rate it. You'll compromise, as we all do, whether we realise it or not.
Rob H
Posts: 5806
Date Joined: 18/01/12
ranmar
ranmar has written exactly what I would if I had taken the time.
Everything is a compromise with a boat, just like a woman
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.
dodgy
Posts: 4578
Date Joined: 01/02/10
Fast, good ride, fuel
Fast, good ride, fuel efficient.
Choose your favourite 2.....
Does anyone know where the love of god goes, when the waves turn the minutes to hours?
craig scott
Posts: 114
Date Joined: 16/10/10
That's brilliant dodgy.
That's brilliant dodgy.
MandurahMatt
Posts: 613
Date Joined: 18/09/13
Anyone had any thing to do
Anyone had any thing to do with Bullet welding hulls in Rockinham? Ive been looking to upgrade into a slightly bigger plate ally boat. Ive heard good things about thier reverse chine hulls, wondering if anyone has anything bad to say about em but.
Bewdey Fellaz
Goin_Fushin.
Posts: 88
Date Joined: 07/12/13
Hi Matt, I've got the Bullet
Hi Matt, I've got the Bullet 4.5 colt in the centre console and love it. It's got the reverse chines that allows two people to easily stand on one side with no fear of it leaning.
Mine only has a 40hp 2 stroke yamaha that struggles a bit when loaded with two blokes and dive gear. Willie from Bullet recommends a 70hp but I can't justify the upgrade. It does the job for now.
Can't complain about the ride either. I don't go hard but it's very smooth compared to my mates tinny the same size.
MandurahMatt
Posts: 613
Date Joined: 18/09/13
Good stuff, i was looking
Good stuff, i was looking into the 4.85 they recomend a 90. But in thinking a 70 should still push it along ok.
Bewdey Fellaz
tot
Posts: 1162
Date Joined: 31/01/10
Go 90
They are a power hungry hull, I wish I had a 90 on my 4.5.
With a 70 it will be ok for 2 but loaded with 3 or 4 it will definitely struggle.
Reverse cycle a/c supply and install - Ducted and wall splits
ranmar850
Posts: 2702
Date Joined: 12/08/12
"Everything is a compromise
"Everything is a compromise with a boat, just like a woman " Good analogy. Some are noisier, better looking, higher maintenance , wetter,
, more trustworthy, more to your taste, than others.
quest
Posts: 248
Date Joined: 03/08/15
haha I like the analogy. So
haha
I like the analogy. So true.
quest
Posts: 248
Date Joined: 03/08/15
If you don't have what you
If you don't have what you like, you'll just have to like what you have.
epic restos and...
Posts: 226
Date Joined: 22/06/15
well said and thumbs up to
well said and thumbs up to willie he builds a good boat
Dhuvinile
Posts: 228
Date Joined: 13/05/12
I personally own a bullet
I personally own a bullet 4.85 with a 70. Certainly has its pros and cons but hey, it's a tinny and I can happily take it 30nm offshore from Dawesville and have done a 85nm round trip from Denham to turtle bay and back
MandurahMatt
Posts: 613
Date Joined: 18/09/13
Bewdey Fellaz