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Old 04-30-2012
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Performance with dinghy on the foredeck

I am going to be building a dinghy that will fit on the foredeck of my Bristol 27. Will the additional windage have a huge effect on performace?
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Re: Performance with dinghy on the foredeck

on my ship[pearson 32] i fell there is better preformance with 8 foot walker on deck as opposed to towing maybe a half a knot which is a lot in 24 hrs=12 natical miles extra made good plus it wont swamp in high seas
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Old 04-30-2012
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Re: Performance with dinghy on the foredeck

Only when the wind blows. The answer is yes, it'll effect performance. Windage and weight on the bow are bad. Dragging something behind you is also slow. Pick your poison. You will definitely notice it when the wind pipes ups.
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Old 04-30-2012
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Re: Performance with dinghy on the foredeck

In my experience windage has less effect on vessel performance than drag.

Crew performance is affected by having something to work around on the foredeck.

I do not want to worry about towing a tender in following seas. We get the tender on deck before heading into bluewater.
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Old 04-30-2012
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Re: Performance with dinghy on the foredeck

I hate towing when under sail. For whatever reason it just irritates me. OTOH, stowing on the fore deck when under 35' can be a pain if you need to get up front for any reason. whatever you decide the dinghy needs to be as minimal as possible.
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Re: Performance with dinghy on the foredeck

I would think the minimum length for a dink is 8ft, which is nearly a third the length of your vessel. I just don't think its practical to haul it on deck, regardless of windage. An inflatable (ie deflatable) would be best IMHO.
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Re: Performance with dinghy on the foredeck

Quote:
How often do you think you would use your dinghy, for getting provisions, or exploring on shore ? What about a Kayak instead ?
How Many Feet do you have for dinghy space ? Do you have a roller furling and how is your anchor connected to boat (anchor roller) ?
I think I would only put the dinghy on deck if I were to be on longer passages, or if I expect bad weather. O/w, I would want easier access to the dinghy. The dinghy is about 7'6". It will extend to about the mooring cleat, which is a couple feet from the bow. Because the dinghy is a sharpie rather than a pram, there will be a constant foot or so of side-deck space all the way to the bow. There is still room at the bow, but, it is a little bit of a concern that I do have hank-on sails. I will probably be a bit more conservative with my sail choice so I don't have to change much. I just don't like the idea of dragging my dink through the short steep waves of Lake Michigan in the middle of the night.

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I would think the minimum length for a dink is 8ft, which is nearly a third the length of your vessel. I just don't think its practical to haul it on deck, regardless of windage. An inflatable (ie deflatable) would be best IMHO.
The two major down sides to using an inflatable for me is that most don't row very well (don't want OB), and the cost. After this summer, I may agree with you. We'll see.

My concern with the original post was that I might be creating enough windage up front that I will not be able to keep the bow into the wind. I suppose in higher wind, the boat will heel and mostly block the dinghy from the wind.
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Old 05-01-2012
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Re: Performance with dinghy on the foredeck

We build a Spindrift 11 foot nesting dingy, nested its about 6 foot long. We went for the hard dingy for the same reasons, I like to row and don;t want an outboard. Eventually it will have a sailing rig as well.

We put it on the bow of our Islander 32, which is a bit bigger then your boat. I haven't really noticed any windage issues but then again, I'm not exactly a performance sailor, and might simply not be noticing the difference. In either case, I would say its not a drastic amount.

I'm curious what design your planning to build, our if it's your own design, and if this is your first boat you'll be building, or if you've built others. The plans for the spin drift come in a 9 foot nesting version as well, which nests to under 5 feet. Might be worth investigating if your open to other options. spindrift

We also like the nesting version for ease of loading and unloading. Both halves float independently so you can lift and lower them one at a time, and assemble it in the water. Plus it makes a great conversation starter!
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Re: Performance with dinghy on the foredeck

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I'm curious what design your planning to build, our if it's your own design, and if this is your first boat you'll be building, or if you've built others. The plans for the spin drift come in a 9 foot nesting version as well, which nests to under 5 feet. Might be worth investigating if your open to other options.
I built a D4 (www.bateau.com/freeplans.php) about 5 years ago out of 1/4" exterior ply. It is falling apart a little, but worked very well. The one I'm doing this summer will be the Polliwog, by Devlin (Devlin Designing Boat Builders). It is just a little shorter, has a longitudinal bench, and with 4 mm okoume, will weigh a lot less. I thought about doing a nesting boat, but didn't want to have to assemble the boat to get to shore after a passage.
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Old 05-01-2012
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Re: Performance with dinghy on the foredeck

The Polliwog's a sharp looking boat! good choice. I like Devlin designs to, although I've mostly looked at his larger stuff as he had several for sale in a marina near ours a few years back. Looks like she'll compliment the big boat nicely too. I think rowing a boat like that around the anchorage will be worth a few degrees of pointing if it comes to that
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