Actually the drag on the "Ultegra level" Shimano dynohubs (DH 3N72 and higher) is so negligible that perception of it depends more on mood than anything objective. A front wheel, lifted and spun, doesn't rotate quite as long as with the SON Deluxe, but when riding you don't feel it. Ditto for the SP. I don't have the test results in front of me, but IIRC no modern dynohub requires anything close to 15 w. In fact, I doubt any dynamo requires anything close to 15 w; even a Soubitez dynamo would have to be only 20% efficient to require 15 w for a 3 w output. And, FWIW, even an old Soubitez bottle or Sanyo or Union isn't as horrible as many people believe -- my rule of thumb description is that they don't quite require 1 gear tooth lower in back for the same effort in given conditions.
I can see preferring rechargeables to dynamos; I used rechargeables for 10-12 years before getting my first dyanmo hub; but drag isn't really one of them -- it's not really an issue. On Thu, Sep 25, 2014 at 12:26 PM, Jim Bronson <jim.bron...@gmail.com> wrote: > With the new SON deluxe hubs, the drag is imperceptible, even with the > light on. This was not the case with the earlier SON hubs or any > generation of Shimano hubs. > On Sep 25, 2014 10:09 AM, "Wayne Mesard" <wmes...@gmail.com> wrote: > >> I'd like to anti-recommend the dynohub approach. I considered it when >> building my Sam, but rejected it for a couple of reasons: >> >> 1. They're expensive! >> 2. You pay the wattage tax whether you're using the thing or not. The >> Interwebs say that the drag costs anywhere from 2 to 15 watts of additional >> pedal power. That's not a lot. But it's not nothing either. >> >> Instead, I bought a USB battery ( >> http://www.amazon.com/gp/product/B00IP1MQNK/), which I'm quite happy >> with. That way I have backup power for all my devices, since they all >> accept USB power (front and rear lights, GPS, cell phone, AfterShokz >> headphones). With the money I saved, I could have bought five of them, but >> one was more than enough. >> >> On my most recent tour, I had no problem keeping the battery charged by >> plugging it in overnight and opportunistically at lunch stops. But just to >> be safe, I also got a solar panel ( >> http://www.amazon.com/Goal-Zero-11800-Nomad-Solar) which mounted easily >> to the rear rack. Like I said, I didn't need it; but I was glad to have it >> as a backup. >> >> Wayne(); >> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "RBW Owners Bunch" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to rbw-owners-bunch+unsubscr...@googlegroups.com. >> To post to this group, send email to rbw-owners-bunch@googlegroups.com. >> Visit this group at http://groups.google.com/group/rbw-owners-bunch. >> For more options, visit https://groups.google.com/d/optout. >> > -- > You received this message because you are subscribed to the Google Groups > "RBW Owners Bunch" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to rbw-owners-bunch+unsubscr...@googlegroups.com. > To post to this group, send email to rbw-owners-bunch@googlegroups.com. > Visit this group at http://groups.google.com/group/rbw-owners-bunch. > For more options, visit https://groups.google.com/d/optout. > -- Resumes, LinkedIn profiles, bios, and letters that get interviews. By-the-hour resume and LinkedIn coaching. Other professional writing services. http://www.resumespecialties.com/ www.linkedin.com/in/patrickmooreresumespec/ Patrick Moore Alburquerque, Nouvelle Mexique, Vereinigte Staaten ************************************* * "Where you come from is gone, where you thought you were going to never was there, and where you are is no good unless you can get away from it. Where is there a place for you to be? No place.* * "Nothing outside you can give you any place," he said. "You needn't to look at the sky because it's not going to open up and show no place behind it. You needn't to search for any hole in the ground to look through into somewhere else. You can't go neither forwards nor backwards into your daddy's time nor your children's if you have them. In yourself right now is all the place you've got. If there was any Fall, look there, if there was any Redemption, look there, and if you expect any Judgment, look there, because they all three will have to be in your time and your body and where in your time and your body can they be?* * "Where in your time and your body has Jesus redeemed you?" he cried. "Show me where because I don't see the place. If there was a place where Jesus had redeemed you that would be the place for you to be, but which of you can find it?” -- *Flannery O'Connor,* Wise Blood * -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
