I'm interested in improving Alphas most of all. Given my speeds yesterday are my alpha results creditable, or should I be expecting to get faster alphas as gybing skill increases?

If your top 500m speed is 22 knots you can't expect 20kt plus alphas?

This is FSW gear in choppy water.


5 best 2 second (at least) average = 45.77km/h [24.71Knots]

2 second run n??1 = 46.57km/h [25.14Knots] (25.9 m. in 2.000 s.) -
2 second run n??2 = 46.22km/h [24.96Knots] (25.7 m. in 2.000 s.) -
2 second run n??3 = 45.83km/h [24.75Knots] (25.5 m. in 2.000 s.) -
2 second run n??4 = 45.38km/h [24.50Knots] (25.2 m. in 2.000 s.) -
2 second run n??5 = 44.84km/h [24.21Knots] (24.9 m. in 2.000 s.) -

5 best 500 meter (at least) average = 40.73km/h [21.99Knots]

500 meter run n??1 = 41.32km/h [22.31Knots] (505.1 m. in 44.000 s.) -
500 meter run n??2 = 40.73km/h [21.99Knots] (509.1 m. in 45.000 s.) -
500 meter run n??3 = 40.62km/h [21.93Knots] (507.7 m. in 45.000 s.) -
500 meter run n??4 = 40.59km/h [21.91Knots] (507.3 m. in 45.000 s.) -
500 meter run n??5 = 40.42km/h [21.82Knots] (505.2 m. in 45.000 s.) -

5 best Alpha-500 average = 33.04km/h [17.84Knots]

Alpha-500 run n??1 = 35.47km/h [19.15Knots] (492.7 m. in 50.000 s.)
Alpha-500 run n??2 = 32.87km/h [17.75Knots] (493.1 m. in 54.000 s.)
Alpha-500 run n??3 = 32.45km/h [17.52Knots] (495.8 m. in 55.000 s.)
Alpha-500 run n??4 = 32.19km/h [17.38Knots] (491.9 m. in 55.000 s.)
Alpha-500 run n??5 = 32.19km/h [17.38Knots] (491.7 m. in 55.000 s.)

Having spent a lot of time working on my alphas over the past couple of months I have come up with quite a few irregularities and want some advice from the gurus about validity and possible cause.

Here is an alpha which Realspeed shows in doppler without a spike but a spike in trackpoint. GT31
First the trackpoint graph, then doppler, then both.




You can clearly see the spike in the trackpoint data both in the graph and table. If you delete invalids the doppler value is even higher which in my mind confirms a problem with the data.

I have mainly been looking at only the doppler graph with trackpoint not displayed to check alphas but I guess this means I should be looking for a match between trackpoint and doppler to ensure validity?

In this case looking only at the doppler graph it looks fine.

A second case and the value doesnt change after deleting invalids but the trackpoint shows a w shape that I seem to remember Daffy saying indicated a problem (searched but couldn't find the post). I see this in quite a few of my alphas and wonder if it is because of where I wear my gps? (on the shoulder strap of my weight jacket).





So in conclusion, for alphas.

Should there be a very close match between trackpoint and doppler to pass alphas? No W shape in either or is a no W in doppler ok?
Should data be inspected before and after deleting invalids to find errors(even in doppler)?

Thanks for any help with this one.