New Posts New Posts RSS Feed: Dinghy speeds
  FAQ FAQ  Forum Search   Register Register  Login Login

Dinghy speeds

 Post Reply Post Reply Page  <1 2345>
Author
iGRF View Drop Down
Really should get out more
Really should get out more
Avatar

Joined: 07 Mar 11
Location: Hythe
Online Status: Offline
Posts: 6490
Post Options Post Options   Quote iGRF Quote  Post ReplyReply Direct Link To This Post Posted: 08 Jan 22 at 12:44pm
There's a reason speed records get set at Weymouth over a 500 mtr course.

Those recordings anyone who goes for GPS speeds will tell you are likely as not spikes, probably caused by pitching in dinghies, I very much doubt either our Albacore which tbh nobody took any more seriously than they take the Aero actually acheived that speed.

I'd recommend any of you do a Weymouth speed trials, it's great fun, and there are prizes for the fastest mono and cat and daily prizes, which are interesting in boat/board speed over wind speed, I had three great years messing about doing it.

If I were RS I'd have someone do it and see if any harbour records for mono hulls could be broken.

Actual speed over water as we all know can get quite exhilerating to the point of scary, but the camaraderie and 'after you henry' attitude the competitors have down there compared to the normal battle for start line space is refreshingly gentlemanly and occasionally eccentrically so.



Edited by iGRF - 08 Jan 22 at 12:59pm
Back to Top
Mozzy View Drop Down
Posting king
Posting king


Joined: 21 Apr 20
Online Status: Offline
Posts: 179
Post Options Post Options   Quote Mozzy Quote  Post ReplyReply Direct Link To This Post Posted: 08 Jan 22 at 2:28pm
So here is an example from the 800. Breeze was about 25 knots.

Here is pretty much raw footage for a 1:43 run which includes a gybe (just cropped the mast cam so overlay it). GPS recorded on a garmin Fenix with glonass and smart recording (just realised I haven't changed it to 1 hz!). So take it with a pinch of salt, I stopped using GPS for analysis as without doppler and 30 hz it's pretty difficult to draw any conclusions. But I just putting it forward as an example of pretty smooth and non-peaky data. 

Link to activity 



Before the gybe (46s) max speed is 37.8 kmh (20.4 knots) and average is 37 kmh (19.97). 
For the full 1.43 max is the same an average is 35 kmh (18.89 knots) over a distance of ~1 km. That includes a drop down to 16.9 kmh during the gybe.  I wouldn't be claiming any concrete top speeds from this, but it is a decent example of what okay data might look like. 

compare with the aero speed trace


RS800 full run with gybe

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: 3199
Post Options Post Options   Quote 423zero Quote  Post ReplyReply Direct Link To This Post Posted: 08 Jan 22 at 3:27pm
See following post, this one removed due to formatting issues.








Edited by 423zero - 08 Jan 22 at 5:23pm
Robert
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: 3199
Post Options Post Options   Quote 423zero Quote  Post ReplyReply Direct Link To This Post Posted: 08 Jan 22 at 3:30pm
https://www.yachtsandyachting.com/forum/forum_posts.asp?TID=237&PN=1&title=fastest-dinghy
Above link from 2004, 24 pages, no abusive comments, this post today, would be met with abuse and derision, how times change.
Robert
Back to Top
iGRF View Drop Down
Really should get out more
Really should get out more
Avatar

Joined: 07 Mar 11
Location: Hythe
Online Status: Offline
Posts: 6490
Post Options Post Options   Quote iGRF Quote  Post ReplyReply Direct Link To This Post Posted: 08 Jan 22 at 4:37pm
Oh for sunny weather again, nice video, if I could have found a reliable crew, think I'd like to use an 800 they're great boats.

Only time I've been really quick in a dinghy is with a crew, once in a very strong offshore wind in an L3K only time I think I've ever actually fully planed upwind, and the other time down the back of the Round Sheppy Island race, so fast in fact it literally stripped all the gel coat off the bottom of the Alto. We don't often get conditions conducive to real speed, waves and chop get in the way, significant I can still remember those two incidents both with my dear departed windsurfing friend and crew God rest his soul, Steve Avery never since. Fstest I've been wind assisted is on a windsurfer or kite, other than that I once got dragged water ski racing at 80 + mph on a massive twin rig a long long time ago, that made my eyes water. lol.
Back to Top
Wiclif View Drop Down
Groupie
Groupie
Avatar

Joined: 04 Oct 05
Location: United Kingdom
Online Status: Offline
Posts: 79
Post Options Post Options   Quote Wiclif Quote  Post ReplyReply Direct Link To This Post Posted: 08 Jan 22 at 5:51pm
My speedpuck gave me a reading of over 120 knots, with a couple of others of 70 plus, when out sailing in my K1.
Of course i believe it, though thousands wouldn’t 
Back to Top
eric_c View Drop Down
Far too distracted from work
Far too distracted from work


Joined: 21 Jan 18
Online Status: Offline
Posts: 359
Post Options Post Options   Quote eric_c Quote  Post ReplyReply Direct Link To This Post Posted: 08 Jan 22 at 6:14pm
20 knots is about 15 times faster than my garden shed, according to GPS.
The shed is firmly bolted to concrete foundations.

GPS, in amateur hands is essentially unsuitable for measuring speed.
Especially low speeds over short durations.
Which is a shame really.
It would be nice to know how fast my Laser was really going in those crazy surfing moments, although I'd never have the time (or presence of mind) to look at the readout.
Back to Top
tink View Drop Down
Really should get out more
Really should get out more


Joined: 23 Jan 16
Location: North Hants
Online Status: Offline
Posts: 766
Post Options Post Options   Quote tink Quote  Post ReplyReply Direct Link To This Post Posted: 08 Jan 22 at 7:27pm
Though GPS will not be very accurate for speed it’s not to bad for distance. Why not use GPS to sail a suitable distance from a buoy in the course relative to the wind you would like to test and drop a second buoy. Then simply sail and time. The longer the distance the more accurate. 
Tink
https://tinkboats.com

http://proasail.blogspot.com
Back to Top
Do Different View Drop Down
Really should get out more
Really should get out more


Joined: 26 Jan 12
Location: North
Online Status: Offline
Posts: 1251
Post Options Post Options   Quote Do Different Quote  Post ReplyReply Direct Link To This Post Posted: 08 Jan 22 at 7:43pm
Exactly as we do for Club speed league.

We have a circle of 12 marks of 900 metres dia. Pick your angle and time yourself between the two opposites. We then calculate both adjusted and real, alright the circle may not always be spot on but come on, it's a bit fun for windy days.


Back to Top
Do Different View Drop Down
Really should get out more
Really should get out more


Joined: 26 Jan 12
Location: North
Online Status: Offline
Posts: 1251
Post Options Post Options   Quote Do Different Quote  Post ReplyReply Direct Link To This Post Posted: 08 Jan 22 at 7:45pm
iGRF. I know it goes against the popular grain but two person boats are (in my opinion) the best route to easy speed. 
Back to Top
 Post Reply Post Reply Page  <1 2345>

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