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I measured it at 4W. For my son delux.
Did you measure 6?For me that's 2% loss. Or on a really bad day 4%.
skinny-
I've not measured it cos I've not got one, just going on the published figures, which say about 6% (with SONdelux being the least, maybe it is 5-5.5 or something).
Of course, your threshold power is a fair bit higher than mine - the less power you have to start with, the more difference the x Watts will make!
frank9755
Yeah, good summary. It manages to be both not very consumer friendly and lacking in actual technical detail.
Andrew from Igaro and the Velogical guys have been in communication with each other. I asked them both but neither is actually sure that it would work. I don't understand why, but I asked if it was likely to work or anyone's guess. If it had been the former, if have gone for it out of curiosity, but Andrew said the latter, so no point in risking it.
Having been round and round in circles with dynamos, learned loads of stuff I never wanted to know, I think I'll stick with batteries. The clincher is that, if a dynamo on all the time gives 6w of drag, and I ride at 60% of threshold, which is about what I did on the TCR, not having a dynamo basically gives me the equivalent of an extra 10 w of threshold power.
I'm willing to carry a good few batteries to get that, and save all the faffing I'd need to set it up.