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Radial rake measurement

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Post Options Post Options   Quote piglet Quote  Post ReplyReply Direct Link To This Post Topic: Radial rake measurement
    Posted: 16 Jan 16 at 9:56pm
I realise this is horses for courses and a bit subjective, but,
What's a good rake measurement using a straight radial bottom section?

I've got 3425 to where the tape touches the top of the transom, half way round the radius.
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Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 16 Jan 16 at 10:10pm
Isn't at least 3/4 of the point of having a Laser to not worry about that sort of nonsense?
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Post Options Post Options   Quote PeterG Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 16 at 9:24am
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Post Options Post Options   Quote rich96 Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jan 16 at 6:01am
I'm sure that someone on the Laser forums will be able to give you an informative answer

The rake issue is not unusual in the Laser
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Post Options Post Options   Quote jeffers Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jan 16 at 9:41am
Originally posted by JimC

Isn't at least 3/4 of the point of having a Laser to not worry about that sort of nonsense?

If the build quality was consistent yes. It is much better now than it used to be. We had some boats at Hunts that had masts at very strange angles.
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Post Options Post Options   Quote Rupert Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jan 16 at 10:23am
Looking at the way the boat is sailed, I assume the more upright the mast is, the more kicker you can Wang on before the boom hits the deck?
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Post Options Post Options   Quote piglet Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jan 16 at 10:39am
I have had 2 very different and very good Laser sailors tell me that they have both had boats with a slightly forward/upright pot, and that under certain conditions the boats seem to be quick if you can get it right.
I don't suppose for one minute I would be able to tell the difference but the reason for asking was that I was looking at buying a 'medium age' (16# ###) boat and I wanted to check it wasn't a friday afternoon boat.
 
I think most people would agree that LP have improved QA in recent years.
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Post Options Post Options   Quote andymck Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jan 16 at 11:26am
The issue was not the pot. They are all the same. The issue was the deck bond. If you look at any boat that has the deck bonded in this way there will be a varying thickness all round the boat. The pot angle was set by the mold, but if there was a slight excess of bonding agent at the bow compared to the stern then there was a significant affect on the overall mast rake. This also means the measurement for rake needs to be taken to the bottom of the hull as the measurement to the deck should be fairly reproducible. I suspect no one noticed until it became an Olympic class.
Now they are aware what the issue is, it can be looked at in the process. I suspect it took a lot of working out what the issue was.
Andy Mck
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Post Options Post Options   Quote jeffers Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jan 16 at 11:36am
Originally posted by andymck

The issue was not the pot. They are all the same. The issue was the deck bond. If you look at any boat that has the deck bonded in this way there will be a varying thickness all round the boat. The pot angle was set by the mold, but if there was a slight excess of bonding agent at the bow compared to the stern then there was a significant affect on the overall mast rake. This also means the measurement for rake needs to be taken to the bottom of the hull as the measurement to the deck should be fairly reproducible. I suspect no one noticed until it became an Olympic class.
Now they are aware what the issue is, it can be looked at in the process. I suspect it took a lot of working out what the issue was.

That and there is a bit of tolerance at the bottom of the pot that allows it is sit off centre (that is usually full of bonding paste) if it has not been put together perfectly.
Paul
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Post Options Post Options   Quote Roger Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jan 16 at 2:11pm
Back in the day..... 1980's I went to pick up a new Laser from Banbury.
There that day were a couple of hot shot, top of the fleet guys, they spent hours weighing hulls and checking the rake by putting their own chosen bottom section in the pot of what seemed like dozens of hulls, they very carefully chose the ones they wanted, can't remember how they checked the rake, but they did say there was big variation. I remember my boat was a 128*** number, which kind of dates the time.

I of course just took the hull they gave me....

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