Talk:Planing (boat)

Page history

• Page Planing (sailing) originated as matter cut out of the 03:41, 26 August 2004 edit of the page which is now named Hydroplane. Anthony Appleyard (talk) 11:20, 27 November 2010 (UTC)

Turning power

• Would you say a hydroplaning craft has less turning power than a displacing one? In my mind this sounds right; you can't turn as sharply if you're skimming over the water. Although if you can cut an edge into the water you probably do all right. These arguments probably apply more to a windsurfer than a rudder-equipped boat or a hydrofoil. Is this worth mentioning in the article?

  I only in relation to planing RIBs. It depends on factors like the x-section of the hull through the water and the ratio of length to width : some RIBs have "shallow V" hulls - they bounce badly round the turn, others have "deep V" hulls they turn smoothly but need more power to get onto the plane than a flatter hull. Probably a similar situation with displacement boats - wide and flat bottomed hulls skid - long or keeled hulls turn well. --User:Mark.murphy

Terminology?

• seaplanes are cool... but, just for the pun... Can they really land on the water??? 189.5.143.217 15:54, 15 January 2007 (UTC)

Wikipedia glitch?

There seems to be a glitsh in this page, so that it can be edited but the edits cannot be saved. Is it just me, or can anybody else try it out? I've been trying to sort the second link to NZ skiffs, but am tearing my hair out... TIA TonyClarke

Discussion about planing

• The image looks more like the boat is being lifted out of the water by its sail... --128.218.19.195 02:32, 22 Mar 2005 (UTC)
• Well, sort of; spinnakers do provide upwards lift a the bow, which is good, as boats running downwind tend to submarine due to the torque on the mast. However, it's still climbing over its own bow wave (which it must do to exceed the hull speed, which is about 5.1 knots in that class) so it is planing, whether the lift is coming from the sail, the hull shape, or any horizontal foils (which look to be illegal in that class). scot 14:49, 12 May 2006 (UTC)
• I'm not very familiar with the Musto class, but it looks as though the boat has jumped out of the water after hitting some other wave. The image from the Albacore page is better, though not ideal since we can't see the stern wave all that clearly. Paulgush 09:38, 4 March 2007 (UTC)
• I am sorry, i really don't know anything about boats, but i was really curious about planing. i don't think i understand one thing though - if the planing is due to a sort of "sound barrier" effect, and since wave propagation in water has a fixed value, how can planing begin at different speeds having different boat weights? this really looks wrong, i mean, if you can change your minimun planing speed just by reducing downward force or shape, how can this fenomeon be due to just "sound barrier"? isn't the sound barrier a fixed value given the fluid in which the object moves? thanks to anyone willing to discuss this, Davide

81.208.36.88 (talk) 23:36, 26 May 2008 (UTC)

• You are correct that, if planing were due to a sort of sound barrier effect, then planing speed would have a fixed value. But planing is not due to a sort of sound barrier effect. This is how it can be variable even though the speed of sound isn't. Planing speed is the speed at which most of the lift for a particular hull is hydrodynamic, rather than buoyant. It is determined by hull weight and shape, not by the speed of sound, which is usually many times higher than planing speed and unrelated. Mark.camp (talk) 00:38, 2 September 2010 (UTC)
• Why is this page about "sailing" when planing applies to all boats? Fiskbil (talk) 00:18, 30 January 2009 (UTC)
• I also have a problem with this article's comparing planing to breaking the sound barrier, particularly when I gather that planing is due to lift on the craft and while planing may represent the point where there is more lift than buoyancy, the logical progression would be actual flight, as some speed boats temporarily attain this if they move too quickly. How can almost flying be compared to breaking the sound barrier? Shouldn't it just be compared to near flight? I assume a plane could also experience planing if it flew slow enough. Promontoriumispromontorium (talk) 22:10, 22 April 2011 (UTC)

I also agree that the comparison of planing to transonic travel cannot be correct. I'm guessing that the original editor was trying to make an loose analogy to there being a critical speed beyond which the physics is qualitatively different, but the present wording comes across as far too literal and is therefor incorrect. There is a different effect which is more directly analogous to the sonic boom, namely when the boat speed exceeds the speed of surface/gravity waves (which is obviously much smaller than the speed of sound in water), causing the classic v-shaped pileup of waves marking the edge of a fast boat's wake, analogous to the sonic Mach cone. Davide above is exactly correct that the critical speed for this effect should be independent of the boat, whereas the planing speed where hydrodynamics dominates over hydrostatics should be boat-dependent. For some boats, the two speeds may be similar, just by coincidence. Anyway, I'm not sure exactly how to fix the article text, since I'm not sure what kinds of hydrodynamic forces are actually relevant here. Is it a Bernoulli effect thing? Or is it more to do with deflection by the hull's angle of attack? "Hydrodynamics" could mean several things, and I know enough physics to know that I shouldn't try to guess the answer to a hydrodynamics problem. Spatrick99 (talk) 19:40, 22 August 2011 (UTC)