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How is it possible that IAS and TAS are different at 0m altitude? Position error? Why is IAS equal to TAS at 0m altitude for best climb speed?
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Since those instruments have springs in it, you can only adjust them perfectly for one messure point (in this case 250 km/h at ground? ). The rest is within a given tolerance.
It is also with old speed-indicators. Their are mostly adjusted to 50 km/h by motorcycles (with top speed below 150 km/h), the rest is tolerated inaccuracy.