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Effect of weight on boat speed

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Post Options Post Options   Quote H2 Quote  Post ReplyReply Direct Link To This Post Posted: 22 May 19 at 10:25am
Related to this is how heavier boats deal with waves on a light wind day. Try catching a K1 upwind on the sea in a light breeze if you need convincing! 
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Post Options Post Options   Quote H2 Quote  Post ReplyReply Direct Link To This Post Posted: 22 May 19 at 10:24am
Focus so far has been on acceleration but you also need to factor in how a boat responds in the lulls. Many of the older designs which are heavier also are able to maintain some momentum in lulls which means they can ghost across the calm patch and get into the new breeze and they also remain able to steer longer. The lighter boats on our pond accelerate faster but also slow down faster!! Hope that makes sense?
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Post Options Post Options   Quote Sam.Spoons Quote  Post ReplyReply Direct Link To This Post Posted: 22 May 19 at 9:11am
A 5% difference in hull weight won't make 5% difference in speed over the wind range, in fact I'd suggest it would be completely unnoticeable in most conditions. But if I was buying a new boat I would expect it to be bang on minimum weight. A used boat OTOH there are so many other factors that 5kg would not put me off buying an otherwise good boat.
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Post Options Post Options   Quote ifoxwell Quote  Post ReplyReply Direct Link To This Post Posted: 22 May 19 at 8:53am
I agree. In most conditions, all other things being equal, the effect would be negligible... but on a marginal planning day the ability to push past your bow wave earlier could make a big difference in a one design fleet
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Post Options Post Options   Quote davidyacht Quote  Post ReplyReply Direct Link To This Post Posted: 22 May 19 at 8:51am
Newtons Laws apply and as Uffa Fox said “the only use for weight is in a steam roller”.  That being said, any difference will be most apparent when “like for like” racing, and will manifest itself as a lack of acceleration compared with similar but lighter boats, and possibly lateness to get on the plane.  Obviously it is the all up weight that also counts ... so the combined weight of helm and boat has to be taken into account.  If I were looking to buy a boat, I would avoid one that is overweight.
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Post Options Post Options   Quote andymck Quote  Post ReplyReply Direct Link To This Post Posted: 22 May 19 at 8:35am
There are many more variables than just boat weight.
A lighter helm boat combination will plane earlier and accelerate faster.
Depending on where the weight is in the boat, there can be other affects. We all talk about trying to keep the weight out of the ends of the boat to reduce pitching moments.
The bottom line is 5kg will not make as big a difference as skill level for most of us. But an equal skilled sailor in a lighter newer boat will be quicker, all other variables being equal.

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Post Options Post Options   Quote stonefish Quote  Post ReplyReply Direct Link To This Post Posted: 22 May 19 at 7:56am
Does anyone know how boat weight effects speed on a planing dinghy for example a Comet, Solo, Streaker etc?

For example how much faster would a boat that weighs 95kg go compared to a boat weighing 100kg if all other variables like helm weight etc are the same between the boats?
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