New Posts New Posts RSS Feed: RS800 Video Library
  FAQ FAQ  Forum Search   Register Register  Login Login

RS800 Video Library

 Post Reply Post Reply Page  123 10>
Author
mozzy View Drop Down
Really should get out more
Really should get out more


Joined: 16 Feb 12
Location: United Kingdom
Online Status: Offline
Posts: 925
Post Options Post Options   Quote mozzy Quote  Post ReplyReply Direct Link To This Post Topic: RS800 Video Library
    Posted: 13 Feb 19 at 7:28am
20 knots... with probably 2 knots of current and fat water for a nano second!

Nice yacht around a week or so ago. Not much water in the harbour put a focus on boat handling but the flat water made it quite nice. A bit of sun helps too!


YouTube Channel
RS800 1144
Back to Top
mozzy View Drop Down
Really should get out more
Really should get out more


Joined: 16 Feb 12
Location: United Kingdom
Online Status: Offline
Posts: 925
Post Options Post Options   Quote mozzy Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jan 19 at 1:20pm
But look at foiling cats. There a flatter kite is faster around the course. 

In light winds you can't put much weight against the kite otherwise the apparent will go to far forward and create a load of drag on the deep cut kite. Then you'll just end up sailing the same speed but higher. That's why the 49er went to tighter cuts and slightly smaller too but faster round the course as well as straight line. There's a Canadian article describing the feel on this for 49ers somewhere... 

Then in heavy winds if the kite is too big you can't get the flow initiated over it which is slow also. 

But the 14 doesn't have great leverage s you can see why they went for a fuller kite to take the depth. 

I just wonder a what amount of righting moment and hull drag that it starts to become faster in VMG to have flatter or smaller kites. 


YouTube Channel
RS800 1144
Back to Top
JimC View Drop Down
Really should get out more
Really should get out more
Avatar

Joined: 17 May 04
Location: United Kingdom
Online Status: Offline
Posts: 5850
Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jan 19 at 1:01pm
Originally posted by mozzy

Do you reckon the I14 would be faster downwind with a smaller kite above a certain wind strength?

You only have to look at the 12 foot skiffs... There's two sorts of faster, faster through the water and faster round the course. With a smaller kite and hotter angles you are inevitably going to be faster through the water, but the evidence seems to be that geometry wins out and lower and still pretty quick wins races.
Back to Top
mozzy View Drop Down
Really should get out more
Really should get out more


Joined: 16 Feb 12
Location: United Kingdom
Online Status: Offline
Posts: 925
Post Options Post Options   Quote mozzy Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jan 19 at 12:03pm
I have in light winds taken the crews wire, with the tiller in front of the helms wires and elastics. Which works, but if there's a gust and the crew needs to move out then it get s bit awkward. 
YouTube Channel
RS800 1144
Back to Top
paolochilds View Drop Down
Newbie
Newbie


Joined: 29 Mar 11
Location: Southampton
Online Status: Offline
Posts: 36
Post Options Post Options   Quote paolochilds Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jan 19 at 10:36am
Can you route the helm trapeze elastic forward for the light? Might mean you can stay holding the tiller?
Paul Childs
RS Sailing
Sales Team and RS100 Class Development Officer
Back to Top
mozzy View Drop Down
Really should get out more
Really should get out more


Joined: 16 Feb 12
Location: United Kingdom
Online Status: Offline
Posts: 925
Post Options Post Options   Quote mozzy Quote  Post ReplyReply Direct Link To This Post Posted: 23 Jan 19 at 9:07am
Light wind sail on Sunday. Wind with tide didn't help either. 

But we took the opportunity to try a new tacking technique that we'd played around with a bit in the light winds last year, but jut hadn't had opportunity to work on due to it being so windy all winter. 

The idea is that by having the helm move through the boat in front of the their own trapeze lines and the control lines then the weight is kept forward. It seems to keep the wide transom clear, but the downside is that you don't have a hand on the helm for much of the tack which makes correcting the turn rate difficult. Also, facing backwards you can't see the crew or jib and how they're moving, which makes getting the timings correct more difficult... the jury is still out!

It was also apparent that we were running quite a bit of weather helm, especially when just getting the helm on the wire. I guess with a tight leech to hold power, all the weight forward and some leeward heel to reduce wetted area it's not surprising.  But we put some bungee over the tiller and had  play around rudderless sailing to get a feel for the amount of sheet and heel to get a neutral helm. 




YouTube Channel
RS800 1144
Back to Top
mozzy View Drop Down
Really should get out more
Really should get out more


Joined: 16 Feb 12
Location: United Kingdom
Online Status: Offline
Posts: 925
Post Options Post Options   Quote mozzy Quote  Post ReplyReply Direct Link To This Post Posted: 12 Jan 19 at 8:52am
Chilled out and slowed down edit of the winter sailing so far, highs and lows!


YouTube Channel
RS800 1144
Back to Top
Daniel Holman View Drop Down
Really should get out more
Really should get out more


Joined: 17 Nov 08
Online Status: Offline
Posts: 934
Post Options Post Options   Quote Daniel Holman Quote  Post ReplyReply Direct Link To This Post Posted: 30 Dec 18 at 3:26pm
Yep like an n12 the whole stock cants on the transom, through a range of 15-20 deg. Max on ie +10 for upwind until about 9kts boatspeed then you start backing off else the bow gets driven in. Downwind you go -5 or more degrees off in breeze.
Back to Top
423zero View Drop Down
Really should get out more
Really should get out more


Joined: 08 Jan 15
Location: United Kingdom
Online Status: Offline
Posts: 1434
Post Options Post Options   Quote 423zero Quote  Post ReplyReply Direct Link To This Post Posted: 30 Dec 18 at 10:14am
Is tfoil adjustable ?
Back to Top
Daniel Holman View Drop Down
Really should get out more
Really should get out more


Joined: 17 Nov 08
Online Status: Offline
Posts: 934
Post Options Post Options   Quote Daniel Holman Quote  Post ReplyReply Direct Link To This Post Posted: 30 Dec 18 at 9:45am
Originally posted by mozzy

It would be interesting to compare distance sailed and speed, upwind and down.†
The 14 is quite narrow for it's sail area, which I guess is why bigger crews are favoured.†
The 800 is over leveraged downwind up to the high teens. With it's fractional kite it easy to push to hard and stall the kite. It still pays to push hard for the VMG, but you have to be careful.
Do you reckon the I14 would be faster downwind with a smaller kite above a certain wind strength? Do you ever get that point where it's too powerful to get flow over it, jib backing?†

Yes shame I donít use the pro start these days that would probs store the info. In 15 kt flat water I would expect 11-12 kts upwind at 100 deg give or take a few degrees upwind. Downwind maybe 15 or 16 kts not sure of gybeing angle maybe 80deg varying massively with wind strength. You canít rally lean on the kite too hard but at 35m2 itís nearly twice size of 800 kite I think.
Yep only 6í wide so a bit tender but tuneable so plenty people win races down at 155kg which is max of corrected range 800 I think.
Yes I think in wind smaller / flatter kite would be good, but you can only measure one in at major regattas so they tend to be more of a compromise. Champs have reaches too which moderates things too.   I suspect the boatspeed is limited slightly by the tfoil downwind, as well as lack of rm, but foil makes downwind in 15kts plus possible. And makes the boat a lot faster upwind.
I donít think Iíve ever had full goosewing jib whilst twin stringing, itís sketchy as hell if crew is in to drop or hoist, but I imagine that in 20kts plus kite is very well eased and more of a parachute than foil even when twin stringing. Gybeing angles get pretty low I guess thru 60 deg.
Back to Top
 Post Reply Post Reply Page  123 10>

Forum Jump Forum Permissions View Drop Down

Bulletin Board Software by Web Wiz Forums® version 9.665y
Copyright ©2001-2010 Web Wiz
Change your personal settings, or read our privacy policy