Tomorrow mornings weather is looking OK (calm, but probably cold again).
I think I'll try another test to try to improve on the first set of results (since I'm not sure I believe them...)
[b]3 helmets: [/b]
Specialised Decibel (Non aero)
Limar Chrono 05 (aero)
Giro Advantage 2 (aero)
Ergomo offset 30 min after bike is in ambient
Run order (to save a bit of time, recovery on slower speeds, cause you need to try to keep power delivery really even). This time the speeds will be taped to the bars to make sure the X-axis data points are the same for each helmet.
(so that's a run of >60 sec for each speed for each helmet, 21 runs total)
Ergomo offset afterwards (hopefully same offset).
If it turns out that these two trials are OK, and we can see real differences, then it is worth taking the trouble to collect a set of helmets together and do a more extensive test.
BTW both Otter and Jester PM'd me - obviously keen to add further performance enhancement to each arsenal at their disposal. :lol: