DESIGNERS COMMENT - PERFORMANCE UPDATE
Since our return to Walvis Bay in March we have completed 7 runs, mainly in the lower end of the operating windspeed range – 14-17 knots.
While the absolute speeds achieved are sub 40 knots and may not seem too impressive , they are consistently in line or above the predicted level for the wind conditions. At least as significant as the absolute speeds is the fact that the predicted very high sensitivity to windspeed , a feature of this configuration, is also reflected in the data, giving strong grounds to expect large increases in speed going from 17 knots up to 20-21 knots.
Retraction of the very draggy low speed rudder is the other big trick we have yet to deploy . This will reduce wetted area by 30- 40% and as 60% of our drag is frictional depending directly on this area, it is not hard to see why 4-5 knots speed increase may result from this alone.
Paul is also reporting good consistent control at speed . If the control remains as good into the mid to upper 40s there could be very little standing in our way.
Strength can be an issue . As we go faster the loads begin to wind up. At 50 knots there will be 55% more load in the wing and foil and connecting structure, than at 40 knots , so we will be keeping a close eye for signs of distress strength of highly loaded parts becomes.
All in all we are in a good position , performing to expectations and supported by a very strong and professional crew.
I am looking forward to analysing the data as we go faster and of course going down to be with the action sometime in the next 2 months
Malcolm J .Barnsley
While the absolute speeds achieved are sub 40 knots and may not seem too impressive , they are consistently in line or above the predicted level for the wind conditions. At least as significant as the absolute speeds is the fact that the predicted very high sensitivity to windspeed , a feature of this configuration, is also reflected in the data, giving strong grounds to expect large increases in speed going from 17 knots up to 20-21 knots.
Retraction of the very draggy low speed rudder is the other big trick we have yet to deploy . This will reduce wetted area by 30- 40% and as 60% of our drag is frictional depending directly on this area, it is not hard to see why 4-5 knots speed increase may result from this alone.
Paul is also reporting good consistent control at speed . If the control remains as good into the mid to upper 40s there could be very little standing in our way.
Strength can be an issue . As we go faster the loads begin to wind up. At 50 knots there will be 55% more load in the wing and foil and connecting structure, than at 40 knots , so we will be keeping a close eye for signs of distress strength of highly loaded parts becomes.
All in all we are in a good position , performing to expectations and supported by a very strong and professional crew.
I am looking forward to analysing the data as we go faster and of course going down to be with the action sometime in the next 2 months
Malcolm J .Barnsley
posted by Paul at 2:19 pm
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