Evido EAD-B2000 Instrukcja Właściciela Pobierz pdf (Strona 22)

downwind. This should be done at about 50 knots, 75 knots and about 100knots IAS preferably at

about the same altitude. The difference between the TAS and GS is the wind component which

should of course be the same value when going up or down wind. If it isn't the pitot/static system

has an error at that speed of half the difference between the two numbers (ignore the sign). If the

apparent headwind component is smaller when flying upwind than the tailwind when flying

downwind then the Indicated Air Speed is less than the Calibrated Air Speed. The reverse situation

means that the Indicated Air Speed is greater than the Calibrated Air Speed.

This procedure will give you three points in the useful speed range. Reduce these errors by 8% if

this was flown at 5000 feet AMSL, 17% if done at 10000 feet AMSL. As the errors will usually be

only of the order of 5 knots or so (hopefully) the altitude will only make a small difference.

Continue by using the same procedure as if you had a Flight Manual position error graph or table.

Re test to confirm that you have made the proper corrections.

Appendix 2

B2000 wind calculations

There are several ways the B2000 calculates the wind.

● The first is just wind component in the current direction of flight.

This is done by subtracting the GPS ground speed from the True Air Speed(TAS). And

displaying this with a pointer on the GRAPHICS page. There is a "bug" you can match to

this pointer to see the numerical value or you can see the actual True Air Speed (TR)and

Groundspeed(GS)as well as the indicated air speed (IN) on the STATISTICS page. (see

GRAPHICS page explanation)

● The second is the DRIFT wind.

When thermalling in climb mode on the B50 the B2000 will determine the centre of the

first complete circle then calculate the wind from how successive completed circles shift.

Obviously it takes two completed circles to get a new wind.

It is assumed that the circle shifts with the wind so if the pilot shifts the circle an incorrect

wind will be calculated. To minimise this possibility the calculation is blocked if the turn

rate varies by more than 20% or the circle takes more than 45 seconds.

The wind is the averaged by looking at how each last circle has shifted relative to the first

so you get an average wind over the altitude layer you climb through, not just the last one

or two circles.

You can finish and restart a new calculation at any time by switching to climb mode on

the B50 for a second or two, then back to cruise.

On the FLY TO page the results of the last 3 drift wind calculations and the altitude at

which they finished are displayed. This lets you see if there is significant wind shear with

altitude.

● The third is the ZIG-ZAG wind.

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