I will be racing next summer on a boat with H3000 (herc perf) instruments and Expedition.
I have always felt that the wind calibration in H3000 system is basically flawed. The main reason is the lack of leeway adjustment in wind calculations. Instead there is emphasis on upwash, which should enter the calculations.
Most boats that I have raced have had fractional rig and the wind sensor on a vertical mast head unit 1 m above the top of the mast. I do not think there will be several degrees of upwash as B&G implies in their calibration procedure.
Last summer I had Nexus (NX2) instruments with Expedition. Expediton compensates for leeway when making the wind calculations. We had very precise TWA and TWD (no "twd tacking") readings on Expedition with no upwash compensation on NX2 system. (some problem with HPC compass, but that is already discussed on this forum).
Unluckily B&G is very vague providing information on how the actual wind calculations are made. It states, that heeling is considered when calculating TWA and TWS for geometric error. No statement about TWD. No statement about leeway compensation.
B&G also speak for regular wind calibrations to get the instruments show valid readings. The problem is that the beans and the potatoes get mixed. I would prefer to calibrate only for the MHU offset. If the system can handle leeway compensation, you don't need anything else in non-shear, regular gradient conditions.
When shear and unusual gradient are present I would prefer to enter them separately in the system and have the compensations logged for later analysis. (Perhaps later another post on how to deal with shear).
Am I missing something or is B&G having the flaw in their way of wind calibration? I can deal with it in Expedition, but would still like to know.
I have always felt that the wind calibration in H3000 system is basically flawed. The main reason is the lack of leeway adjustment in wind calculations. Instead there is emphasis on upwash, which should enter the calculations.
Most boats that I have raced have had fractional rig and the wind sensor on a vertical mast head unit 1 m above the top of the mast. I do not think there will be several degrees of upwash as B&G implies in their calibration procedure.
Last summer I had Nexus (NX2) instruments with Expedition. Expediton compensates for leeway when making the wind calculations. We had very precise TWA and TWD (no "twd tacking") readings on Expedition with no upwash compensation on NX2 system. (some problem with HPC compass, but that is already discussed on this forum).
Unluckily B&G is very vague providing information on how the actual wind calculations are made. It states, that heeling is considered when calculating TWA and TWS for geometric error. No statement about TWD. No statement about leeway compensation.
B&G also speak for regular wind calibrations to get the instruments show valid readings. The problem is that the beans and the potatoes get mixed. I would prefer to calibrate only for the MHU offset. If the system can handle leeway compensation, you don't need anything else in non-shear, regular gradient conditions.
When shear and unusual gradient are present I would prefer to enter them separately in the system and have the compensations logged for later analysis. (Perhaps later another post on how to deal with shear).
Am I missing something or is B&G having the flaw in their way of wind calibration? I can deal with it in Expedition, but would still like to know.
