Friday, October 14, 2011

Facebook & Makani fins

After hearing a lot of good things about Makani fins from freestylers, I bought a Makani Auku slalom fin a couple of months ago. It was intended for my Warp 71 slalom board with a 7.0 m sail. I followed the Makani fin guide to pick the right size, a 38 cm fin.

I got to use the fin only a few times, but the results were mixed. On perfectly flat water (in the cove at Fogland), the fin worked like a charm - it felt very slippery and fast, and delivered great speed. But as soon as I went out into choppier waters, I got one spinout after the other, forcing me to switch to a different fin.

Today, Makani fins announced on their Facebook page that
"Our first blend of slalom fins are not working to our standards so we are liquidating them on eBay at $79 with Free shipping".  
Following the link to the eBay auction, they state:
"This AAUKU is designed for free race boards and slalom boards with TUTTLE BOXES for LIGHTWEIGHT RIDERS in the larger sizes especially as they are very soft. "
A little Google search quickly confirmed that soft fins cause more spinouts. Well, hats of to Makani fins for recognizing a problem and acting on it. Anyone buying the fin on the eBay auction now has the information that the fins won't work well for middle- and heavyweights. Still a bummer, though, that I spend $120 on what turned out to be a useless piece of plastic (unless I magically loose 50 pounds..).

Another thing that bugs me is that Makani has not updated their web site yet. On the web site, the Auku fin is still described with terms like "The power of Speed", having a "powerful shape" that "permits using fins 2 cm smaller than regular slalom fins", "the best slalom fin", and "a winner from the starting line". No mention whatsoever that the fin is designed for " LIGHTWEIGHT RIDERS"!

So, dear Makani fin people, please update the web page for the Auku fin ASAP, unless you want to loose a lot of trust. And while you're at it - how about offering anyone who purchased the Auku and found it a poor performer a replacement?

Sunday, October 9, 2011

Trailer work

For the last 5 years, we have been towing our windsurf gear on this trailer:
It's light enough to be towed by a Honda Civic, but fits about 10 sails, 5 booms, 8 masts, and (as shown) 4 boards. In theory, there is enough room for more boards on the top - but big, rusty pieces of metal have been falling off the top for a few years now. I have not trusted it enough to tow the trailer with boards on top for quite a while... So finally, I decided to just take the top level off. After a few exhausting hours of sawing, off it was:
As you can see, the top frame was pretty much rusted through, even though the metal was originally rather solid (the previous owner of the trailer had put a roll of carpet around the top, which kept the metal wet & steamy for weeks). Fortunately, the lower parts of the frame are all fine. Here's a picture of the trailer now, about 50 pounds lighter and more aerodynamic than before:
Astute observers may also notice new wheels, which we put on so that we can tow the baby to the ABK Clinic in Hatteras next week without worries. The trailer also has a couple of new stickers - here's a favorite (thanks, Andy!):
Here's one of my other favorites:

Hope to see a few of you in Hatteras next week! There's still lots of space in the ABK clinic. Coach Ned has rented a big house right on location again, and there's probably still room in there, too. The road repair should be completed within the next 2 days, so there is no reason not to come! Rocktober is a great time to be in Hatteras - last year, I ranked our two weeks there as the "vacation of the year", ahead of Bonaire, the Gorge, Maui, and Cabarete (all spots that I love, too!).

Friday, October 7, 2011

Rocktober .. or not?

Here near Cape Cod, October can be the best month for windsurfing, with great wind, warm water, and decent air temperatures, which is why many windsurfers call the month "Rocktober". In the last few weeks, we often saw wind forecasts that looked great a few days out, only to go lower and lower with every update. So we got quite excited when we finally got a forecast for cooler northwest winds in the mid-20s that remained the same for several days in a row, all the way up to the day before.

For the best NW winds, we usually drive about 2 hours to Orleans or Wellfleet on Cape Cod. With 2 successive days of promising forecasts, we planned on one day of exploring new beaches, a night at a local motel, and a second day for a downwinder. The forecasts looked good enough for Dean, the fastest guy on our GPS Team Challenge team, to join us. Well, those of you who know about NW winds around here can probably guess what happened... by the time we made it to the beach at 12:30 pm, the wind had dropped:

We went out, anyway, and had some fun in the gusts for a while until even the gusts did not get us planing anymore. Ok, so the latest forecast had included a dip to 20 mph around 2 pm, but also a rise back to 26 mph at 5 pm. We remained hopeful and waited a while... until finally, a squall came through, and we had 45 minutes of nice winds. We had picked the launch spot (Sunken Meadow Beach in Eastham) because it was right next to an area that was only 2-4 feet deep at low tide - but when the wind hit, the tide had already added about 4-5 feet more water, so we had plenty of chop for a nice bump & jump session.

We checked the forecast again during dinner, and the computer models still predicted 24-27 mph for the entire day. Indeed, things looked great in the morning, with averages in the upper 20s. But with all-day winds, we had a nice breakfeast first, and made it to the beach around 11 am - when the wind had once again died down:
Well, some whitecaps were still to be seen, so we decided to rig big: 5.3 for Nina, 7.0 for Dean, and my 6.5 Pilot for me (since I had discovered the day before that my trusted 7.0 Matrix needs to be repaired, and I had left my 8.5 at home to make space for the smaller race sails). Bigger boards, too: the Falcon 111 for Dean, my Warp 118 for me, and the Hawk 95 for Nina. By then, the forecast had finally changed, and it predicted steadily decreasing winds.

On the water, it became clear that the wind was not good enough for a long downwinder or even good long-distance averages. The gusts were nice, and Dean got a few runs above 30 knots - but the lulls were much too lully, and I did not always manage to live up to my favorite nickname. The water up in Indian Neck was quite flat, though - much better suited for speed runs than the day before, and we got higher speeds despite less wind. Here are my GPS tracks:

My top speed was just barely above 30 miles, a bit disappointing. The Pilot is definitely not a speed sail - it had plenty of power to get me going, but it was sometimes hard to control in the gusts. With the relatively high foot cutout, I never managed to close the gap, either. That's very different from the Gaastra Matrix, which is more speed- and topend-oriented; I have sailed the slightly larger Matrix in significantly more wind without any stability problems. Not really a surprise - I did buy the Pilot primarily as a freestyle and light wind sail.

On both days, Dean was a lot faster than I was. Here are his GPS tracks for the second day:

He did point out that he had rigged too small - his 7.0 race sail just barely got him going. The tracks show that it definitely got too small towards the end of the run, when the wind had dropped a couple of miles. However, his acceleration and top end in gusts was much higher than mine - he beat my top speeds by about 5 mph, about the same as the day before. I found it rather interesting to see that the 0.5 m larger race sail had less power than the "price point" sail - but if the wind had increased by 15 mph, Dean would have been perfectly fine, while my sail would have become impossible to control. I think the larger part of the speed difference is still due to his better skills, not to equipment differences - but that will not keep me from looking for a cambered sail to fill the gap between my 8.5 and 5.8 m race/freerace sails.

Of the three of us, Nina used the smallest sail and board, but had the fewest problems to plane. That is, until you take body weight into account: relative to weight, Nina's sail and board were actually larger than Dean's and my equipment, since Dean and I both outweigh her by 50%.

On most other days, I'm faster in all the speed rankings that are used on the GPS Team Challenge, but yesterday, Nina beat me on the 1 hour averages and the alpha. She improved her new personal best by 3.6 knots, and now ranks 23 of 82 women on gps-speedsurfing.com for the 1 hour (and 2nd of 12 female US windsurfers!).

Dean followed Nina around a bit and filmed here with his GoPro headcam:


After 2 days of not-quite rocking winds, I finally remembered why we usually don't go sailing in the colder seasons unless the forecast is into the 20s: that gives us room for the wind to come in below the forecast, and still get a nice planing session in, without having to use the biggest gear. So, while the winds were not as good as forecast, we still had plenty of fun on the water. And with Dean the speed machine being out there with us, we even managed to get a decent ranking on the GPS Team Challenge for the month: #30 of 46. That's better than most months, and not bad for a couple of days with just so-so wind. But Rocktober is still young and has plenty of time to live up to its name .. and November often is even windier. We'll definitely be back to Indian Neck and Sunken Meadow!

Saturday, October 1, 2011

Creating background maps for GPS Action Replay

This post explains how to create background maps for GPS data in GPS Action Replay. It also contains a few downloadable maps I made (mostly for Cape Cod) at the bottom. Making a map is pretty straightforward and takes maybe 5-10 minutes.

Step 1: Create an image file in Google Earth.
  1. Open Google Earth, and navigate to the region that you want to create a map for. It helps to have a big monitor and to make the Google Earth window as large as possible.
  2. Make sure that you see the scale legend (in the bottom left corner). If you don't see it, select "Scale Legend" in the "View" menu. Also make sure that north is straight up.
  3. Save the image from Google Earth, using "File" => "Save" => "Save Image As". I suggest that you create a new folder called "Maps" or similar where you put all the images and the maps you'll create.
Step 2: Calibrate the map in GPS Action Replay
There are different ways of doing this. The one I found easiest is described below: we will use a GPS track to give us the starting point, and use the scale legend from Google Earth on the image to scale the image (using  the "Measure distance" function in GPS Action Replay).
  1. Start GPSAR, and open a track from the location you want to use.
  2. If necessary, switch to the view that shows only the track. Make the window as large as possible.
  3. Click on the "Parameters" button, and make sure that the two checkboxes at the bottom ("Rotation control" are not checked.
    Click on images to see larger versions

  4. In the "Maps" menu, select "Create a new Map from JPG". Open the file that you just created in Google Earth. The background now will change - most likely, the image is zoomed in or out way too much.
  5. Change the zoom level so that you can see the entire background image (a mouse with a scroll wheel is really useful here). Then, click on the "Move Map" button. You should now see two handles ("Anchors") in the image (yellow, crossed circles).

  6. Move the anchors to move the map, and make it larger or smaller. You may want to use the "Slide" button to move your view point. Keep using the zoom, "Move Map", and "Slide" functions until the tracks seem to be at about the right place (we'll fine tune later).
  7. Click on the "Move Anchors" button, and move one anchor to the start point of your traces, and the other one on the same height in the image.
  8. Use the "Measure Distance" function to measure the length of the scale on the image. Use the "Move Map" function to adjust the size of the map so that the distance measured is the same as the distance shown on the scale. Use only the anchor that's not at your start point, so your start point remains fixed. Make sure the image remains straight, not tilted.
  9. Double-check that the starting point is correct, and that the image is straight. Once the entire thing looks right, save the map using "Maps" => "Save Map". Make sure to save the map in the same folder as the image that it's based on.
Once you created and saved a map, you can load it and re-use it in the future through the "Maps" menu. After creating a map a couple of times, creating a map for a new spot will only take a few minutes.
If loading a map that you saved does not work, it's probably because the map and the image file are not in the same folder. If they are, it sometimes helps to quit GPSAR, and start it again - every now and then, the program gets confused.

Finally, here is a ZIP file with some GPSAR maps that I made. It includes map and image files for Duxbury, Fogland, Kalmus, West Dennis, Ned's Point, Avon, and Maui. (You may need to right-click and choose "Save linked file as" to download the file).