Rake Settings
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Hi all,
Hoping to get some advice.
On 2049 (a wooden O’Donnell) I currently have the front of the mast at deck level 700mm from the bow, and the mast foot I have not managed to measure but I have not changed this since I bought the boat from Ben, and it seems to be almost as far back as it can go in the adjustable step. I think the meausrement to back of mast foot is roughly 3400. THe measurement from tip of mast to aft face of transom is well under 6000 and is more like 5950. The mast seems very raked back with these settings, although it feels nice to sail and pretty quick. My complaint with regard to feel while sailing is that in medium conditions it quite often feels like the boat does not power up as soon as it should. I think this is likely to be my sailing rather than the rig.
My question is in these medium conditions is it worth playing with moving the rig forwards to try and gain more power? and if yes how far forward, is it worth rebuilding the deck to gain more adjustability into the bearing?As an aside, my mast is a quite bendy for my weight so that may also be the problem. If anybody has a stiff metal mast they have spare or want to swap for my fairly bendy one let me know.
Hi Adam,
My mast is 720mm from the bow and the tip to transom rake varies between 6050 and 6100mm. Good to see you guys have gone metric at last!
Karl
Only the younger ones Karl, the rest of us are still in the dark ages!!
Hope all is well with you metric guys down there.
Cheers
MikeAfraid I have never been anything but metric!!! !
Cant race this weekend, so think I might have a play with standing the rig more upright, see what happens!
We did quite a lot of measuring last weekend at Medemblik. Most of the quick boats were about 700mm from the intersection of the bow and deck to the front of the mast and about 6100mm from the top of the mast to the middle of the transom at it’s intersection with the deck. I would start from there. Your mast seems to have much too much rake on it.
Andy
Andys numbers are a good start point, but the fine tuning can only done by how the boat feels when you sail it, I find a good guide to be that whilst sailing the boat flat upwind in a force 2 with the telltails flowing correctly then the boat should be able to sail in a straight line when you let go of the tiller . If the boat tends to head up heavily into wind then the rig is probably to far back in the boat, if it tends to bear away, then the rig is too far forward. I dont tend to worry to much if there is a very slight amount of heading up into wind as this gives a small amount of feel to the helm.
@Mike Edwards wrote:
Only the younger ones Karl, the rest of us are still in the dark ages!!
Hope all is well with you metric guys down there.
Cheers
MikeGetting cold down here now! Wish we were going into summer as well! But otherwise yes all ok down here. Only me going to Sweden as all the others are pleading poverty and looking to the wellington worlds. Many Brits going to Kalmar. Nick?
Andy Turner,
Do you have the raw data you collected in Medemblick on Mast rake?
Did you also measure how long the boats are as you are measuring from the bow for the deck measurement and from the stern for the masthead measurement.
Did you compile any other data in hull type, mast type, sailmaker.Thnaks
Brad
CAN-500Hi Brad – I’m afraid I didn’t do as much measuring as you had hoped! I’m measuring to the intersection of the bow and deck, not the actual front of the boat. All the boats measured were between 690mm and 700mm from the bow intersection to the front of the mast (they all had carbon masts which allows you to put the mast a bit further forward than Al ones). Carbon masts were between 6000mm abd 6010mm from the top of the mast to the middle of the intersection between the transom and the deck. Al masts are not raked quite as much since they tend to be further back in the boat.
Gear at Medemblik: Terry Curtis can probably update you re the worlds in Kalmar but there were a lot of Germans at Medemblik and they mostly had either Green or Quantum sails (GER) on Ceilidh masts (Holland). The Brits mostly had C-Tec masts from NZL (although Nick sails with a Ceilidh) and North, Quantum or Pinnell & Bax sails. Hulls were either Hein (Germans) or Delft (a few Germans and Terry (AUS) or Rushworth or Icebreaker (Idol Composites – GBR).
Andy
Andy,
when you talk of the intersection of the bow and the deck is that to the straight line along the deck to the straight line up the stem, or to the projection of the sheer forward to a point beyond the rounded of stem?Also when measuring the boats are the 300mm and 180mm stem curve control points measured to the actual radiused stem or a projection of the sides forward to a point? The stem rake projection to the baseline, is that also measured against the raduised stem or the projected point forward of the actual stem?
From looking at the jig setup these appear to be the only points that are not measured to a projected sharp corner.
Thanks
Brad Johanson
CAN-500Hi Brad,
are the 300mm and 180mm stem curve control points measured
Measured to the radiused surface. I know it doesn’t seem very logical! The same goes for the stem rake.
Dave CooperHi,
Good to see so many active on your forum. Just to clarify a question asked regarding gears used at the worlds. I used a AUS Delfs hull and not an Icebreaker.
I also would like to thank the brave sailors from UK who didnt listen to the weatherstatistics and came to Kalmar.
See you!
Thomas
Thomas,
Thanks for the update. Nice sailing!!
You forgot to mention what type of icebreaker you do use to clear out your bay so you can sail in the spring.The class secretary Mary said she was going to compile an equipment list from the worlds. What position was the first wooden boat?
Not all who post on the UK site are British, there are a few of us North Americans looking to meet you in Scotland in 2011.
I am getting an old German wooden boat to use till I get my new wooden boat done.I wonder if any Brits are going to the Belgian National on Sept 11 and 12, I am flying over to sail the old gal I sailed at medemblick.
Brad Johanson
CAN-500
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