The best video on the subject. The left screen model and the two videos on the side are pure genius! wed can really see what is happening with the different forces.
It made sense to me, but I already understood the concept. This is a tricky but very important thing to communicate. I suspect that there would be even simpler ways to illustrate the principle, for example using a single spring line made to one of the ends. Driving the vessel toward that end will draw the end against the dock and allow the other end to swing out. Fundamentally, this is because the FORCE VECTOR of that line under load has a component in line with the vessel but also a transverse component in toward the dock, all because the vessel has maximum beam at about midships and very little at the ends. (A perfect rectangular scow would not behave in this way. In that case you'd rig the spring line to the outside quarter of the end you're driving against, in order to induce a transverse component.) In short, I think a paper model could really show HOW a spring line acts in the simplest case. Then we apply that principle to a real vessel with other dock lines and other considerations. But people need to get the CONCEPT, because every situation requires a specific application of that concept. Of course you're quite right to emphasize the importance of fenders for such operations. And overhangs, and projections such as boomkins, all the things which make us wince to even think about.
Good video. For springing off against the wind I've always wanted to have a good sized flat fender for that corner against the dock. Doing this many times with a catamaran the round fenders when force is applied just start rolling out of position. A couple of months ago I overworked my bow thruster trying to get the bow across the wind (it was blowing me against some rip rap rocks near the waste dock). I was being lazy about it, and the overheat protection kicks off on the bow thruster after a minute or so. Everything was very slow motion so no real danger. So I reverted to the reverse - gun it, forward gun it, repeat, repeat. Looked stupid from shore, but it worked. Here's the problem: I did it. I know how to do it. But my prop wash shouldn't have helped in that situation. So I need to go to the middle of the harbor and practice this maneuver until I fully understand it. I've seen too many sailors who have years more experience than me, get into situations where what has worked, isn't working today. Under stress, even just a bit, is not the time to figure it out. So doing it in the middle of the harbor until I fully understand how to really understand these moves. I also just realized I should make a chart. Boat stationary, rudder Straight. Motor forward... what happens? Back to stationary. Hard motor forward...what happens? Establish a baseline for prop kick. Then Boat stationary rudder hard to PORT Motor forward... what happens? Back to stationary. Hard motor forward...what happens? Then ...rudder hard to STARBOARD. Can I do the forward/backwards and turn in either direction? (That's the puzzle of what I did. My prop wash in reverse is to Port, Forward it turns the bow to port. So how did I go to starboard? I'm sure there's an answer. I'm sure I can puzzle it out. But none of this knowledge is deep and broad enough to automatically know in an emergency. That's where I want to get to. ) Just musing
Hi WillN2go1, the shape of my hull gives an advantage for definite, pinning the fender as the boat rotates. I guess you do need a rethink on the fender situ with a catamaran being nearly flat sides. And ye, going out and taking time to figure things out is well worth the investment to keep stress low. Propwash and propwalk are the only thing we have to help us on our boat. That and warping around. Some days we just have to wait out the weather. thanks for commenting.
This is excellent in many conditions, in particular with your form of boat. If you have a wide stern (many modern yachts), I personally prefer to use the windward stern cleat as spring instead (to a bolder half a boat length behind). Steer towards the quay (counter intuitive), motor in forward, this will free your boat from the quay. Slowly move steer to middle, wait until you're far enough (give extra slack with stern line) and let go. Advantage of this approach is that at no point in the procedure will your boat push hard on the quay. No fast release needed. Less potential for damage, more control. However, with thin sterns, as your boat, there's not enough pivot power, and your approach should be preferred instead.
I hear a lot of experience in your comment. We find quite a few tricks modern boats can pull don't work as well on our old boat or vice versa, but we do enjoy playing about to see what works and doesn't. Just for kicks, I shall maybe try your technique tomorrow to see how it fairs or doesn't. Thanks. :)
The best video on the subject. The left screen model and the two videos on the side are pure genius! wed can really see what is happening with the different forces.
thanks! Glad you enjoyed 😁 I tried my best to make it all clear. I’m glad it came across
It made sense to me, but I already understood the concept.
This is a tricky but very important thing to communicate. I suspect that there would be even simpler ways to illustrate the principle, for example using a single spring line made to one of the ends. Driving the vessel toward that end will draw the end against the dock and allow the other end to swing out.
Fundamentally, this is because the FORCE VECTOR of that line under load has a component in line with the vessel but also a transverse component in toward the dock, all because the vessel has maximum beam at about midships and very little at the ends. (A perfect rectangular scow would not behave in this way. In that case you'd rig the spring line to the outside quarter of the end you're driving against, in order to induce a transverse component.)
In short, I think a paper model could really show HOW a spring line acts in the simplest case. Then we apply that principle to a real vessel with other dock lines and other considerations. But people need to get the CONCEPT, because every situation requires a specific application of that concept.
Of course you're quite right to emphasize the importance of fenders for such operations. And overhangs, and projections such as boomkins, all the things which make us wince to even think about.
@@starfishsystems Definitely couldn't hve worded it better myself. thanks for writing that. Ben
Nice one! All calm, pre-briefed and controlled. Just as it should be 👍.
Thanks Ian, it does seem when ever we talk about/ plan a departure, nothing bad ever happens. :)
Good video. For springing off against the wind I've always wanted to have a good sized flat fender for that corner against the dock. Doing this many times with a catamaran the round fenders when force is applied just start rolling out of position.
A couple of months ago I overworked my bow thruster trying to get the bow across the wind (it was blowing me against some rip rap rocks near the waste dock). I was being lazy about it, and the overheat protection kicks off on the bow thruster after a minute or so. Everything was very slow motion so no real danger. So I reverted to the reverse - gun it, forward gun it, repeat, repeat. Looked stupid from shore, but it worked.
Here's the problem: I did it. I know how to do it. But my prop wash shouldn't have helped in that situation. So I need to go to the middle of the harbor and practice this maneuver until I fully understand it. I've seen too many sailors who have years more experience than me, get into situations where what has worked, isn't working today. Under stress, even just a bit, is not the time to figure it out. So doing it in the middle of the harbor until I fully understand how to really understand these moves.
I also just realized I should make a chart. Boat stationary, rudder Straight. Motor forward... what happens? Back to stationary. Hard motor forward...what happens? Establish a baseline for prop kick.
Then Boat stationary rudder hard to PORT Motor forward... what happens? Back to stationary. Hard motor forward...what happens?
Then ...rudder hard to STARBOARD. Can I do the forward/backwards and turn in either direction? (That's the puzzle of what I did. My prop wash in reverse is to Port, Forward it turns the bow to port. So how did I go to starboard? I'm sure there's an answer. I'm sure I can puzzle it out. But none of this knowledge is deep and broad enough to automatically know in an emergency. That's where I want to get to. ) Just musing
Hi WillN2go1, the shape of my hull gives an advantage for definite, pinning the fender as the boat rotates. I guess you do need a rethink on the fender situ with a catamaran being nearly flat sides. And ye, going out and taking time to figure things out is well worth the investment to keep stress low. Propwash and propwalk are the only thing we have to help us on our boat. That and warping around. Some days we just have to wait out the weather. thanks for commenting.
This is excellent in many conditions, in particular with your form of boat. If you have a wide stern (many modern yachts), I personally prefer to use the windward stern cleat as spring instead (to a bolder half a boat length behind). Steer towards the quay (counter intuitive), motor in forward, this will free your boat from the quay. Slowly move steer to middle, wait until you're far enough (give extra slack with stern line) and let go.
Advantage of this approach is that at no point in the procedure will your boat push hard on the quay. No fast release needed. Less potential for damage, more control. However, with thin sterns, as your boat, there's not enough pivot power, and your approach should be preferred instead.
I hear a lot of experience in your comment. We find quite a few tricks modern boats can pull don't work as well on our old boat or vice versa, but we do enjoy playing about to see what works and doesn't. Just for kicks, I shall maybe try your technique tomorrow to see how it fairs or doesn't. Thanks. :)
i haven't seen that one before.Great job!
Nice easy way to leave a tight space or turn into wind. glad you like. more coming. :)
The man with the glorious hair! Shampoo sponsorship coming asap!!
I would love that, all too often the hair is frizzy and out of control.
Being severely folically challenged I’m deeply offended. Shamelessly tactless! 😂
Great video. Makes it look easy.
It is some days :)
Super handy trick :)
thanks
Thanks for sharing
no prob :)
Good tip 👌
Glad you liked it 😁
Useful tip thanks.
No prob :)
👍
😊👌🏼
I'm looking for the big hand coming out of the water to push you in. Am I missing something here? Bill
You couldn't see the big hand?