I finally understood why meyer talked about distributed inductance and capacitance. This is also related to air coils. And the concern is to know the isolation between turns. Meyer tell us 3kv isolation wire. Ok a transformer have a difference of voltage between turns that is dictated by the number of turns in the other hand,
an air coil will not have the same voltage difference between turns in the first and last layer for example. Because inductance of an air coil is dependent ^2 to the diameter too. So to have a good distribution of the voltage thru the turns you might prefer to have a internal diameter bigger. However inductance will be the same but you would need less turns and less layers for say. So the difference of inductance of the first layer to last is small.
Distributed capacitance should be the minimum around all the coil to not allow for example that the resonant frequency of the outer turns to be lower than the resonant frequency of the tank. Progressive winding is needed for this.
Oh boy
Regards
