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Started By
Message
1
Posted on 4/26/12 at 11:29 am to AlxTgr
quote:
Yeah, that's been the pattern. You don't even know when to attack, much less how.
Here you go again. Nothing substantial to actually support your opinion. Do your thing, Pee Wee.
Posted on 4/26/12 at 11:30 am to AlxTgr
quote:
I had never heard of mushing before. That's the part that drives me crazy.
I've always referred to that as "half throttle." Obviously not the most accurate description, but it makes the point.
Posted on 4/26/12 at 11:32 am to Jester
think that's where our argument differs, I'm arguing at how my "big fast dangerous" bass boat would perform at one speed as opposed to another, you're arguing all boats
This post was edited on 4/26/12 at 11:36 am
Posted on 4/26/12 at 11:39 am to DownshiftAndFloorIt
quote:Are you taking into account the difference between displacement hulls and planing hulls?
DownshiftAndFloorIt
quote:
Boats are a hard problem, especially with planing hulls, because the boundary conditions for a planing hull include a mixture of air and water.
quote:
the Reynolds influence decreases with the viscocity in the medium, so when considering the difference between water and air (and the surface areas involved), lifting out of the water wildly decreases the drag forces in the flow, and thus, the force required to maintain the speed.
Posted on 4/26/12 at 11:44 am to AlxTgr
Mhmm. For the sake of this discussion i'm not even talking about the portion of the boat out the water though because the air wake is absolutely irrelevent unless we are trying to figure out how fast you need to go so you dont have to worry about your hat flying off.
Eta: what that quote says is that it is easier to push your boat in the air than it is in water, not that there is air bubbles under the boat.
Eta: what that quote says is that it is easier to push your boat in the air than it is in water, not that there is air bubbles under the boat.
This post was edited on 4/26/12 at 11:46 am
Posted on 4/26/12 at 11:47 am to DownshiftAndFloorIt
I think much of this is minutia that has little do do with how significant wake making.
Posted on 4/26/12 at 11:50 am to Boats n Hose
At the OB guys talking kintic vs potential energy. quote:
If you're on plane and it's a relatively large channel, please stay on plane. If it's a small canal, please idle. If it's an inbetween size, I won't be mad at you either way, but just swerve to the opposite side as you pass.
Agreed.
Posted on 4/26/12 at 11:54 am to AlxTgr
Im nit sure about that.
Lets say we are doing this in metric (easier)
For the wake to not increase as you go faster, the surface area must go down at least as fast as the velocity goes up.
I'm gonna check myself against my textbook in a lil bit before i say what i was bout to say. I think the amount of area you need to loose for that to happen will surprise you.
Lets say we are doing this in metric (easier)
For the wake to not increase as you go faster, the surface area must go down at least as fast as the velocity goes up.
I'm gonna check myself against my textbook in a lil bit before i say what i was bout to say. I think the amount of area you need to loose for that to happen will surprise you.
Posted on 4/26/12 at 11:58 am to AboveGroundPool
quote:
think that's where our argument differs, I'm arguing at how my "big fast dangerous" bass boat would perform at one speed as opposed to another, you're arguing all boats
Well, being as I know nothing about your boat (Champion, I assume), I can't talk specifics.
Posted on 4/26/12 at 12:00 pm to DownshiftAndFloorIt
quote:
Eta: what that quote says is that it is easier to push your boat in the air than it is in water, not that there is air bubbles under the boat.
There is certainly lift provided by the air pocket.
Posted on 4/26/12 at 12:04 pm to AlxTgr
quote:
I think much of this is minutia that has little do do with how significant wake making.
Yep. Jester is just trying to save face at this point from what I can see.
As a sailor, with a displacement hull and big fricking stick hanging up in the sky to cause even more severe crashing when hit with a wake from the beam, I've been very aware of power boaters throwing wakes they don't need to be for decades.
It's really simple, either go to true idle far away from the area you need to idle through, or haul arse. There is no in between. You are driving a planing hull. Plane it. Get as much of the hull out of the water as you can and you will throw less wake. The argument about kinetic and potential energy is specious. The part that counts is how much water you are displacing because that's what's going to throw the tallest waves. Tall waves are what causes damage. The rest is irrelevant.
If you are displacing water with a planing hull you are pushing up a wave with nowhere to go but out. Until you get on plane, you are simply making a larger/taller wake. Once you get on plane, you are displacing minimal water. The more you plane, the less your boat displaces, the shorter the wake wave will be.
So next time you see a sailboat with a big pirate flag flying out the back, please don't slow down unless you're coming in for a beer. You won't hurt my feelings if you're doing a hundred as long as you're in control of it and give me some room. Same thing when I'm docked or at anchor. It's just common courtesy and most power boaters don't even realize it.
FYI, a displacement hull will not throw a wake without it being under power and trying to overcome it's hull speed. So you don't have to bitch at me about flying into a no wake zone under sail. Look behind me... nothing there.
Also, you are responsible for your wake at all times. Legally.
Posted on 4/26/12 at 12:05 pm to faxis
quote:
It's really simple, either go to true idle far away from the area you need to idle through, or haul arse. There is no in between.
+eleventybillion
Posted on 4/26/12 at 12:08 pm to Jester
Air bubbles in the water would cause the boat to sink lower into the water. Boats are not bouyant in air nor water full of air bubbles.
Posted on 4/26/12 at 12:13 pm to AboveGroundPool
Did these guys ever figure out to account for the amount of energy that was being shot out in the rooster tail?
Posted on 4/26/12 at 12:20 pm to The Sportsman
Well, this had potential until the physics nerds fricked it up.
This post was edited on 4/26/12 at 12:22 pm
Posted on 4/26/12 at 12:22 pm to DownshiftAndFloorIt
quote:
Air bubbles in the water would cause the boat to sink lower into the water. Boats are not bouyant in air nor water full of air bubbles.
I'm not talking about bubbles in the water (Bermuda Triangle). I'm just talking about the aerodynamic force working under the hull. Not really sure how much affect it would have, though. You would also have downforce counteracting it.
Posted on 4/26/12 at 12:23 pm to The Sportsman
quote:
Did these guys ever figure out to account for the amount of energy that was being shot out in the rooster tail?
You could certainly use a flow simulation to check it out...
Posted on 4/26/12 at 12:25 pm to BrotherEsau
quote:
Well, this had potential until the physics nerds fricked it up.
Good ole Alx/Downshift throw down. I don't think they agree on anything.
Posted on 4/26/12 at 12:25 pm to faxis
quote:
Yep. Jester is just trying to save face at this point from what I can see.
As a sailor
As a sailor, you must have learned fluid dynamics through osmosis.
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