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jeffers View Drop Down
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    Posted: 02 Jun 14 at 10:10am
Originally posted by rodney

In my defence I was just a little tired and my mind was somewhat distracted over the weekend. Rest assured that all will be good for the future roadshows!

Sorry  Wink
Paul
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Post Options Post Options   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 02 Jun 14 at 10:32am
Graeme

The Dzero is quite a lot lighter. Hull weight is 40kg (Mk2 epoxy Nova) vs 30kg , but that ignores the rig, where the Nova is ally mast and long ally boom. the Dzero is all carbon and much lighter, so a difference in all up weight. the plumb bow of the Zero maximises waterline length, so that is likely to be almost identical. Sail area is similar - Fat head versus fully battened.

With those stats and the punk PY of 1050 vs 1071 for the Nova you would expect it to be faster Wink 
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Post Options Post Options   Quote rodney Quote  Post ReplyReply Direct Link To This Post Posted: 02 Jun 14 at 11:20am
[QUOTE=rodney] [QUOTE=getafi
Rodney Cobb
Suntouched Sailboats Limited
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Post Options Post Options   Quote iGRF Quote  Post ReplyReply Direct Link To This Post Posted: 02 Jun 14 at 12:26pm
Originally posted by SimonW99

Graeme
The Dzero is quite a lot lighter. Hull weight is 40kg <span style="line-height: 1.4;">(Mk2 epoxy Nova)</span><span style="line-height: 1.4;"> vs 30kg , but that ignores the rig, where the Nova is ally mast and long ally boom. the Dzero is all carbon and much lighter, so a difference in all up weight. the plumb bow of the Zero maximises waterline length, so that is likely to be almost identical. Sail area is similar - Fat head versus fully battened.</span>
<span style="line-height: 1.4;"></span>
With those stats and the punk PY of 1050 vs 1071 for the Nova you would expect it to be faster Wink 


Yes, but the Supernova has way more volume and is another known 'ghoster' that outperforms its yardstick in light conditions, I guess it depends how light the conditions were, we didn't even get out it was that light.
I'm just thinking the volume might carry it. I've not seen the new production boat on the water, but Dans Punk felt a little 'sticky' the one time I sailed it when it was too stupid light to really give it a good shot. Looks like I won't get to find out until July 5-6 at Hythe, then again this trial was on the sea wasn't it? So maybe the difference wouldn't be so apparent.
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Post Options Post Options   Quote Null Quote  Post ReplyReply Direct Link To This Post Posted: 02 Jun 14 at 12:33pm
Im not sure Graeme, inland i have seen Supernovas walloped by Solo's in light stuff.  I suspect the Zero will be faster like simon says check out predicted PY etc.
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Post Options Post Options   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 02 Jun 14 at 12:36pm
It certainly didn't feel sticky yesterday. and I am not sure that I would agree about the volume. It certainly supports weight well. Not to comment on anyones pulchritude, but I am 93kg, Adrian, Jimbo and I believe Gordon are all perhaps a little more Embarrassed and  it didn't struggle.

I could certainly achieve a clean release off the transom and that nose isn't exactly bluff, so no sign of stopping it.

The supernova's battened sail holds a shape in the light, which helps, but its real benefit is in marginal planing conditions where the transition is so smooth it planes away whilst others are still trying to get over the hump.

The Zero could be made to generate a good sail shape in the light without full battens.
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Post Options Post Options   Quote iGRF Quote  Post ReplyReply Direct Link To This Post Posted: 02 Jun 14 at 12:36pm
Yes I know all about the Solo effect but that tends to take place in ultralight conditions, I tend to have problems with a Supernova in about 5-8 mph whereas the Solo is generally 2 -4 mph, but yes it's the same thing so I guess it depends how light it was..

Edited by iGRF - 02 Jun 14 at 12:37pm
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Post Options Post Options   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 02 Jun 14 at 12:37pm
If they are being walloped by Solo's they are not being sailed right or those pesky Solo pumpers are up to their tricks again  LOL
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Post Options Post Options   Quote Null Quote  Post ReplyReply Direct Link To This Post Posted: 02 Jun 14 at 12:48pm
Originally posted by SimonW99

If they are being walloped by Solo's they are not being sailed right or those pesky Solo pumpers are up to their tricks again  LOL
Wink LOL
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Post Options Post Options   Quote jeffers Quote  Post ReplyReply Direct Link To This Post Posted: 02 Jun 14 at 12:52pm
OK...sorry for the delay but below are my own personal observations and thoughts on the D-Zero:

At the D-Zero Demo day held at Hunts SC we managed to do some direct comparisons with a D-zero against a Laser. Whilst it was expected that the D-Zero would be much faster the observations were surprising.
The comparison took place in a light F2 with occasional puffs to F3. The helms doing this were myself and a guy I usually have a close fight with on the water in his Laser.

Upwind:

Upwind it was immediately noticeable how much higher the D-Zero would point than the Laser, a good 5-10 degrees. It did not slip sideways as quickly as the Laser either and did maintain boat speed better when the wind dropped off. There was no way the Laser could get to a windward mark faster unless they nailed the beat and the D-Zero got it wrong. It was also noticeable how much easier the D-Zero looked to sail and the lack of fuss when sailing. In the puffs the boat heeled and accelerated and came flat with a little trimming.
Tacking the boat seems to tack very quickly indeed with very little loss of speed. Acceleration out of the tacks were noticeable even when there was no ‘pump’ from a roll tack.
We also started with the D-Zero some 10 yards downwind of the Laser. In a very short space of time the D-zero had climbed above the Laser and was some 10 yards upwind and going faster despite the high pointing angle.

Offwind – Reaching

Reaching the boat was a delight. Accelerating quickly in any puff even without taking a pump. The transition to planning was very smooth, soon leaving the Laser far behind. Which could get planning but had to be worked much harder. When it came to gybing the boat was much better mannered than the Laser, a bit of heel to windward to induce the bear away and the boat gybe smoothly, inciting confidence as the sail popped across to really get the boat moving on the exit of the gybe.

Offwind – Running

This was the only point of sail where the Laser boat speed was anywhere near the D-Zero. The D-Zero accelerated much quicker in the puffs due to the light weight but did slow down quicker in the lulls. The Laser (by virtue of being heavier) took much longer to slow in the lulls so would catch up. The D-Zero felt much more secure downwind with the sail kited up though (sitting on the chine) and was also a lot more comfy even when you moved well forward to be alongside the daggerboard case. Whilst the Laser tended to rock around unless you really were in control the D-Zero felt as if you could almost let go of the tiller and the boat would not change course.

Other observations

The rudder loads were light and the cassette rudder arrangement is great for coming ashore as you can raise it half way ready for the shallow bits.
The sail controls were nice but it was felt that they should be a little longer so they can be tied off further back so they are in reach and ready to adjust (a Laser sailors opinion, Adrian did say that Dan usually attached his to the daggerboard).
The hiking position was very very comfy. Even after several sails (in varying winds) I felt very little fatigue in my calf muscles despite not wearing my hiking pads.
Overall the boat was a joy to sail. Everyone who got out came back with a big smile on their face. We even had one visitor who could not sail due to a foot injury but had come to have a look and speak to people prior to ordering one for himself.

It is worth noting that I did spend a fair amount of time in the boat on the Demo day (when others were not waiting) and once the wind built to a steady F3 with gusts into the F4 range the boat flew and felt very secure inspiring confidence even on a shifty inland puddle.
Paul
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