vsi zero error
dear friends ,
i am not an professional engineer , but am facinated by aviation. recently i acquired a VSI that belonged to a b 747 and was made by aerosonic. the problem is that when it is at rest on my level table it shows a small climb. i wonder why it has this zero error. i have seen photgraphs of vsi s , many of which seem to show a small climb error. is this some design error or is it simply somehting wrong with the unit that i had. furthermore , why don't they have a knob that can correct for the error located outside of the instrument ?
loads of questions ....and merry christmas to all !