Category Archives: OD-65

Hotlaps Update, September 2013

Hotlaps Handicaps September 17 2013

Hotlaps 2013 is a sailing format that helps skippers practice skills while doing fun, solo laps that are posted online. The Hotlaps database allows skippers to compare their lap time results with others; they can also contrast the relative performance of different boats that sail under the same ‘trial lap’ conditions.

There are six different Hotlaps raceline locations, and each has its own Hotlaps course: PLUMGUTBREADNUTKNAPTRACKICONLINKOUSSULU, and HEPURN. Sailing a Hotlap takes only ten minutes, and you can do it any time you want, in any boat.

hotlapsposters Just go to one of the racelines and click on the ‘Hotlaps 2013′ poster above the green buoy; it will give you all the info you need.

When you finish sailing the lap you can post it online by clicking a poster that’s labeled “Enter your lap time here.” It’s just as easy as that. 🙂

Sailors have been doing Hotlaps and posting their results since early in 2007, but this year we started a new 2013 cycle in deference to the large number of great, boats that have recently hit the water in SL. Since we began it in January, Hotlaps sailors have logged 442 lap scores sailing 45 different boat classes! Let me give a shout-out to that great group of 68 skippers who did all those laps:

2525, ak Topsail, Andi Merryman, Armano Xaris, B112, B117, B12, BM12, Brett Kjeller, Bunnie, Chaos Mandelbrot, CharliePakk, charliepakk, Dekka, Destiny Wescott, don Berthios, Emelia Azemus, Fearless Freenote, Glorfindel Arrow, gnupf gufler, Hannelore Ballinger, HansMarx, Hay Ah, IDBSDF61, JFos, Joy Acker, Justin Blade, Kain Xenobuilder, Kentrock Mesmer, Kris Hollysharp, Lance Corrimal, laured Cabassoun, Lesbo Charisma, Little Vixen, LucyInTheSky Afarensis, Maiko Taurog, michiya Yoshikawa, Nikif, notohama, nozomimi karu, Ome Audeburgh, pascal kira, Patrice Cournoyer, Pazzo Pestana, Peacy Cortes, Pensive Mission, poko Zepp, Popow Horbaczewski, Porter Tracy, Qyv Inshan, Rebbie Resident, Rim Telling, Ronin Zane, S11D, sailman, Samlara Vintner, SkyBlue Earthboy, Slanty, SteveLL resident, Takabou Destiny, Trapez Breen, VictorCR, Wolfhard Resident, Wrye Diabolito, Xi Larnia, xpaulx pain, yala74, Yuukie Onmura. ~~ WOOTS! ~~

2013 Hotlaps

All that hotlaps data goes into a public spreadsheet that contains multiple, linked pages that sort the results by race line and boat class, color-coded by skipper. Here’s an example, showing the submitted lap data for Plum Gut from January through September 16:

Sept 18 2013 Plum Gut Laps

click to enlarge

You can click the above image to get a larger view, but you can also just go to the live spreadsheet page any time to see the list of entered lap times.

2013 Handicaps

The pool of standardized lap data makes it possible to compare performance of different sailboats and calculate a “Handicap Factor” for each popular boat class.  Hotlaps 2013 uses the Melges-24 as it’s arbitrary reference standard. The M-24 is the Hotlaps index boat, and by definition it has a Handicap of 1.00. (You can see that shown in red in the first data row below).  All other boats have handicap values expressed relative to that standard.  

Here’s the current summary list of Handicaps for all the tested boats at each of the race courses:

summary HH

Each row in the above matrix represents a different boat class and the columns contain the handicap values for those boats for the six race lines.  Slower boats (i.e., those with longer lap times than M-24) have Handicap Factors that are less than 1.00,  and faster boats have handicap factors greater than 1.00. 

handicapsFor example, several sailors tested the Mesh Shop Laser One on each of the six Hotlaps courses. The average handicap values were 0.75, 0.73, 0.74, 0.62, 0.69, and 0.79. That’s a pretty tight clustering of results, considering the varied sailors involved and the differences of each course.

The average handicap for all courses was 0.72, suggesting that the Mesh Shop Laser One is 28% slower than  the Melges-24 on any typical racecourse (The M-24’s handicap= 1.00).

 The figure to the right shows a current list of handicaps for tested boats, averaged over all six lines. The slowest boats in the bunch include the Shelly, the Fizz,  and the Galiko NY32 (which has a Fizz engine). All these boats produced handicaps of 0.50-0.60, evidence they are roughly half as fast as the Melges-24.

Of course, a slow boat is not a bad thing; it just reflects the builder’s design and vision. Several other boats had handicaps as slow as the ones named above in the 0.50-0.60 range, including the Leetle Cat II, the Patchogue II, the RM Pilot, and the ACA Tiny.

Cruiser handicaps.

tri

powered by Rotaru

However, that’s the slow end of the spectum; most cruise boats are faster than that. The cruisers in SL tended to generate handicaps that range from 0.60- 0.90. That means they are 10-40% slower than the Melges-24, at least when sailed with a 15 knot wind. Nearly all Trudeau boats fit in this 0.60-0.90 “cruiser”-group. It’s a realistic speed-spot for them, since most Trudeaus are classic designs of earlier, multipurpose vessels; they are not hotrods.

Many other popular boats also fit in that Cruiser 0.60-0.90 speed-niche. For example, Craig Kbata’s Teleri 20 scores 0.70, Manul Rotaru‘s Beach Trimaran rates a 0.82, and Rene Marine‘s RM-12 comes in at 0.69. Quest Marine has two boats in this speed range as well; the 2M (0.74) and the Scow  (0.85).

bandit 50Analyse Dean’s recent Bandit 50 is one of the quickest of this whole cruising group. It scored a 0.89, placing it just 10% behind the Melges 24 racer. Kain Xenobuilder also has a new cruiser, the Cafe del Mar 75, that uses the same BWind 2.5 engine as the Bandit 50. You might think Cafe’s sailing performance would be similar to Bandit’s, but you’d be wrong. 🙂 CDM75The Hotlaps data shows that the Café 75 is a much faster boat, earning a handicap of 1.12; that beats Bandit 50 by over 20% !!

The Cafe Del Mar is designed to emulate a beamy mid-size cruising boat, but it sails more like an ocean racer. It’s even  12% faster than the lean-and-mean, carbon and glass Melges 24! Wowzers!

I’ll tell you much more about Bandit 50, Cafe 75, and the RM 12 in a separate post soon. 🙂

Racer Handicaps

The third large group of handicaps primarily includes the large, ocean race boats in SL. They all tended to score in the 0.90-1.20 range. 

Q M-24 launchSince Hotlaps 2013 uses the Melges 24 as it’s benchmark standard to set the other handicaps, it’s no surprise that boats that score around 1.00 are also racers. For example, Kanker Greenacre’s Tako 3.3 scored a handicap of 1.03 in this series, almost identical to the M-24. 🙂 

The Quest IACC scored a 0.94, a bit behind the ACA33 Racer with 1.03. The Mesh Shop’s two ocean racers are right in that mix as well; The OD65 ranked 1.10, and the VO70 earned a 1.03.OD-65

It’s interesting to comment that the Mesh Shop VO70 has a handicap that’s identical to  the old  Wildwind VO70 (1.03). That makes a lot of sense since both builders were modeling the same boat, but it’s great to see the consistency. 🙂

Speaking of Wildwind boats, the present lap results clearly show that WildWind is continuing its reputation for building the fastest ocean racers in SL sailing. The Wildcat-45 catamaran scored a 1.12, the WW Open-60 rated 1.07, and the (still beta) WW AC-72 came in with a rather incredible 1.54. If WildWind decides to release it, the AC-72 could be the fastest sailboat ever launched in Second Life. More important, it would be a truly remarkable emulation of this year’s RL Americas Cup racer. 🙂

ac72 crew

Handicaps for History

There are still many boats to test and extra data laps to run to get accurate numbers across the whole fleet. By December 2013, we should easily exceed 500 new database laps, and that data will be added to a pool of many thousand laps on numerous courses dating back a full seven years.

That’s prolly a good time to sit back with a stiff drink and try to make some conclusions about what Hotlaps can tell us about the diversity of boats we all share and sail in Second Life. 🙂

harpoon

One Design 65

I’ve already written several posts about “Dutch” Kain Xenobuilder’s VO-70, a boat modeled after the Volvo Open 70 Rule used in the round-the-world 2012 Volvo Ocean Race. Dutch’s Mesh Shop VO-70 is a remarkably accurate, mesh re-creation of the Volvo racer, and it even comes with textures that match each of the teams that competed in 2012.

Well, this month Dutch added a new boat to his Volvo fleet; it’s the One Design 65, and it matches the Design Spec for the next VOR that’s scheduled to kick-off in 2014.

Now We Are One

The 2012 Volvo Ocean Race was a remarkable display of audacity and endurance, as teams raced the world’s fastest sailboats in a damn-the-torpedoes dash around the globe.

However, it proved to be a daunting challenge to build a series of individual boats that fit within the box of the Open 70 Rule. That greatly drove up the total cost for each entrant while adding uncertainty and delay. Only six teams survived this pre-game test in 2011-2012.

Use of a box design rule also reduced the reliability and safety of the competition fleet. Three of the starting boats (i.e., half the fleet) had to withdraw from the first leg of competition due to structural failures.

For these reasons, four months ago the Volvo committee announced the next VOR would race in new one design boats. The choice of a one design standard will dramatically reduce costs and development time, while also enhancing safety.

The new Volvo One Design (aka the Volvo 65) is 65 ft long (7% shorter than a VO-70) and it weighs 30% less, but it promises to be nearly as fast as it’s predecessor. (note: the bowsprint is 15% longer. 🙂 )

The choice of a VOR one design standard was met with general approval by the ocean race teams, and the increased opportunity the new boat provides will mean as many as a dozen teams could belly-up to the start line when the next Volvo Ocean takes off in 2014. It already looks like an all-female team will be part of that fleet!

One Design 65 by The Mesh Shop

Well, the sad news is that you won’t see a Volvo One Design officially hit the water for at least a year, as teams plan and the consortium of builders process their orders.

The good news is, while you wait in breathless anticipation, Dutch has you covered! A few weeks ago he launched the Mesh Shop One Design 65, carefully modeled to adhere to the new Volvo spec. 🙂 Take a look below:

Dutch’s OD65 matches the graphic for the “real” Volvo racer better than  my pictures can show. If you think about it, only one of the above boats is actually real: The Mesh Shop OD65. You can sail it today. The other boat is just a graphic of an idea that might sail in years to come. 🙂

The OD65’s measurements, rigging, and detailing are very close to the Volvo spec. As the images of the cockpit to the right show, it’s hard to tell the boats apart. (OK,ok, it’s not that hard. One of the boats has Jane at the helm, and we all know that no one would ever let Jane near the wheel of a real Volvo Racer!)

The new Mesh Shop OD-65 incorporates many of the features of the VO-70, and then adds a host of new bells and whistles. For example, the boat has redesigned sails that are more realiastic and are far easier to texturize. More important, the OD-65’s asymmetrical spinnaker now convincingly collapses when it’s out of tune, and the mainsail nicely folds on the boom when lowered!

The cockpit and deck plan of OD-65 is racer-clean, and less cluttered than the larger VO-70; the boat has just the essential winches and there’s only one central crank station. Nonetheless, the detailing of the build is pretty remarkable. If you click on the image to the right, you’ll see what I mean. The deck hardware, helm stations and rigging are all finely finished and functionally realistic. You can even read the name of the tackle supplier on the main sheet block shown in the insert!

The spars, rigging, and keel are all phantom while sailing, similar to the VO-70, so there’s little fear of hitting overhanging bridges or running aground in shallow waters; the boat only draws 1.5m.

You won’t run out of prim, either. The OD-65 weighs in with a resource-scrimping LOD=96; that’s less than half the size of the VO-70 (LOD=212)!

Textures

VO-70 has the advantage in the texture department. It comes bundled with more than a half-dozen themed texture sets that are based on  the 2012 Volvo Ocean Race team graphics. The designs are very nicely done, and easy to apply.

In contrast, the OD-65 only comes in one style; it’s an understated charcoal hue, and it reinforces the impression that OD-65 is a lean, mean, serious racer.

The OD-65’s theme comes from the RL Volvo One Design announcement. There aren’t any VOR One Designs on the water yet, so there are no RL team colors to copy. 🙂

Hey, no worries, though! As I mentioned above, Dutch has made it very easy to modify and install texture templates for this boat. Sailors should have no trouble painting their personality on OD-65 in broad strokes and bright colors. 🙂

Performance

Speaking of pimping your ride, let’s talk OD-65 performance. No surprise the boat shares much in common with the VO-70, so most of my comments about that boat also apply. In fact, you can get a start-up version of the OD-65 manual here that should answer most of your questions.

Once you take the helm, you’ll notice right off that OD-65 inherited a souped-up version of  VO-70’s salt spray off the bow. It’s a real adrenalin rush, so talk to your cardiologist before you sail this boat! 🙂

Under the hood, OD-65 uses the BWind 2.5 sail engine developed by Becca Moulliez. Over the past two years BWind’s established itself as an extremely popular, low-lag, easy-to-use, and highly flexible design platform. If you’ve ever sailed a BWind boat, you’ll have no trouble getting under sail with the OD-65.

The boat uses a limited set of intuitive chat commands and keyboard arrows to adjust the helm and control the sails. There’s also a color-coded numerical display that gives feedback about essential race parameters.

OD-65’s add-on hi-tech gear includes a skipper-adjustable canting keel that counterbalances the huge sail rig. There’s no VO-70 style ‘automatic’ keel option, but that’s ok; you really don’t need that auto feature on a dedicated racer. 🙂

iWind

As I discussed a few weeks ago, Mesh Shop boats have their own wind setter system that is truly innovative and quite distinct from the setters SL skippers routinely use.

For everyday sailing, OD-65 is like any other BWind boat. A skipper just has to say “cruising” in chat, followed by the standard BWind speed and direction commands. However, if a competition is planned, a skipper just says “racing.” That makes the boat listen for a set of wind parameters broadcast to the fleet by the Mesh Shop’s unique iPad wind interface.

I’ve talked about the VO-70 iPad controller before, but the interface is even better with the introduction of the OD-65. A skipper or race director can use the touch-tablet to key-in wind direction and intensity for all nearby racers; it can do a lot more too. It can set the amplitude for short-term gusts and shifts, as well as intermediate and long-term changes in wind direction.

I’ve already described how the ultra-short term “wind jitter” works for Mesh Shop boats. The new controller adds options for longer term ‘wind drift’ as well, and the modulation curve for that feature is shown in the chart to the right.

Here’s how the drift works: Once a race starts, the average wind direction gradually changes over time in a linear progression. There’s also a several-minute sinusoidal ‘wobble’ superimposed on the directional shift that’s intended to keep racers on their toes. 🙂 The iPad setters are now free  for any sailor or RD who wants to give them a try.

If any of this wind stuff sounds boring or confusing, don’t fret too much! Dutch just posted a very nice explanation of both the new wind and the iPad wind setter functions in a pdf format manual! Go get a copy here!

Polar Perfect

The performance curve for Dutch’s original VO-70 went through a number of updates as new features were added. Each performance change brought the boat closer to the real Volvo Racer.

Well, that process continued through the OD-65’s beta development as well, with some pretty remarkable results. The chart to the right has a blue curve that plots boat speed as a function of real wind angle for the launched OD-65. The chart has a nearly identical red curve superimposed on the blue one. That red line reflects the performance of the RL Volvo Open 70 race boat. Woots! The boats are nearly identical.

The data comparison set comes from Dutch’s testing, but my numbers look the same.

I’ve done polar plots for six years on nearly every sailboat I could get my hands on in Second Life. With that experience, I have to admit it: under  “default wind” conditions, OD-65 is the closest match to the real thing I’ve ever seen in an online boat, at least where speed plots are concerned. 🙂 Pretty nice work, Dutch! 🙂

As usual, I still have a lot more to say about this boat, and a handful of small gripes too. I mean it sideslips, it doesn’t have windshadow, the keel is phantom… 

But WOW, today I’m looking at the details of this boat and that speed plot above, and I’m thinking that Dutch Xenobuilder just launched a virtual boat that embodies the physical dimensions, detailing, and polar performance of the next real life VOR contender. OD-65 isn’t an online cartoon boat; it’s a first-stage, realistic emulation of the actual Volvo Racer. That idea is worth thinking about.

Let me add that Dutch isn’t alone. This past summer a small handful of builders launched new vessels that also reveal a striking attention to detail and handling. With the commitment and dedication of such great builders, maybe SLSailing is turning a corner this year, and setting a new, higher bar for realism in virtual sailing.

When the RL Volvo One Design finally hits the water in late 2013, i’m willing to bet a sailing reporter will describe it as “A pretty accurate analog version of the Mesh Shop OD-65 boat.” 🙂

Stop by The Mesh Shop in Tschotcke and you can test drive the OD-65 yourself, or go pick one up from the Second Life Marketplace. 🙂