[QUOTE=noglider;16261787]

So I gather (and dimly remember) that the bottle dynamos always put out 3W and the dynohubs had lower output and lower drag. Now they have higher output, so the big disadvantage with bottle dynamos is that they present more drag than hubs. Still, the higher drag is sometimes justified by the greater convenience.

[QUOTE]

If you mean "all bottle dynamos are rated at 3 watts at some speed," I can probably agree, but it's not true of all hub dynos. If you mean "bottle dynos put out 3 watts no matter how fast you're spinning it, it just isn't true. Just look in the hub dyno thread in Electronics, at the graph of power output for hub dynos at several different speeds. Electrical output increases as speed increases with constant resistance load - it's just how generators work. The same trend applies to bottle dynamos.