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Mast rake: explain please! |
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Do Different 
Really should get out more 
Joined: 26 Jan 12 Location: North Online Status: Offline Posts: 1312 |
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 Topic: Mast rake: explain please!Posted: 09 Dec 14 at 2:38pm |
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Thanks Mike.
I'm all out of conversation on this one. Your's sounds like a good plan and fairly transferable to my rig, I'm sticking with that.  |
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AlanH
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Joined: 17 Apr 10 Location: Scotland Online Status: Offline Posts: 84 |
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Posted: 09 Dec 14 at 4:26pm |
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Thanks Mike. I move my ram back on Osprey too as I rake, so glad to see your confirmation. Its quite an art trying to avoid losing too much pointing when you rake/ otherwise depower. Having ram and rake on one system sounds good. I have 4 ropes to adjust rake/ ram, so sometimes opt for just opening slot with barbers instead when it blows up, rather than faff with 4 ropes. But that crude method loses height.
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sawman
Far too distracted from work 
Joined: 04 May 11 Online Status: Offline Posts: 205 |
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Posted: 09 Dec 14 at 7:13pm |
I get this when using chrome or safari browsers - try firefox, this works for me with Mac OSX yosemite |
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NHRC
Posting king 
Joined: 13 Dec 13 Location: Lymington Online Status: Offline Posts: 102 |
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Posted: 10 Dec 14 at 6:07pm |
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Hi mike,
When going through the de-powering gears, how does take compare to pre-bend? Do you use full rig tension before you get to raking...? |
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Mike Holt
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Joined: 29 Nov 09 Location: United States Online Status: Offline Posts: 58 |
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Posted: 10 Dec 14 at 8:57pm |
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In my head I am going from a high power setting to a low drag setting so it is a bunch of incremental steps with a few considerations to make.
1. Is it flat, choppy or rough? The flatter the water the quicker you can go to a low drag set up. 2. Is it gusty? Do I need to set up for the top or the bottom the wind range? As I rake I will also go down on ram, trying to keep the mast shape the same. We calibrate the settings so that as we rake the ram comes down at a "neutral" rate. If you set a boat up with the ram unloaded, mark where it goes at each calibration point as you rake. We do it in 1 inch increments. We "take up" the shrouds at the same rate. However, this actually translates to a gradual increase in shroud tension, which also results in extra static mast bend. I have my set up automated, so I only have to release forestay and take up shrouds. At the same time I will increase outhaul and cunningham. At a certain point, for us around 18 knots I will also start to move jib leads outboard. As I go through the range I repeat these steps. At some point we pull on a flattener in the main, takes out about 6" of leech length and enables us to get under the boom easily. There is also a point where continuing to pull kicker on is adding drag so if the boat is tripping I will stop pulling that on. This continues until the wind has become to strong to handle! Hope that all makes sense. Mike
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NHRC
Posting king
Joined: 13 Dec 13 Location: Lymington Online Status: Offline Posts: 102 |
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Posted: 11 Dec 14 at 6:36am |
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Cheers for your post Mike.
The only difference between what your doing and I'm doing re de-powering is that your 505 is hog stepped with a strut and separate controls my Merlin is deck stepped with lowers and has a one string adjustment. I wonder if the way the one strong increases lowers loading as I rake, is about the same amount as your floating stru adjustment. I think most merlin sailors with a one string system rarely alter their lowers. Though easing them a touch in light wind and very big breeze does happen a bit to get a controlled lower mast bend. |
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Do Different
Really should get out more
Joined: 26 Jan 12 Location: North Online Status: Offline Posts: 1312 |
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Posted: 18 Dec 14 at 4:04pm |
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Thanks Sawman. Now installed Firefox; missing images have appeared.
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Time Lord
Far too distracted from work
Joined: 03 Dec 13 Location: Warwickshire Online Status: Offline Posts: 301 |
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Posted: 18 Dec 14 at 4:42pm |
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NHRC
In the Merlin one string systems that I have come across, the lowers are incorporated into the system. Have you set yours up differently? |
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Merlin Rocket 3609
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NHRC
Posting king
Joined: 13 Dec 13 Location: Lymington Online Status: Offline Posts: 102 |
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Posted: 23 Dec 14 at 1:30am |
Mine are incorporated too but they are adjustable as well, separate to the rig tension that controls the shrouds and forestay. You can use your lowers in the same way that Mike was saying that he uses his mast strut. Edited by NHRC - 23 Dec 14 at 1:33am |
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