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  1. JennyB

    Using RC motors on E-bikes [Archive]

    That's right, but as a bikie from WAY BACK I'm more used to thinking of gears in inches. That's the diameter of a directly-driven wheel that would produce the same speed for the same revs. 100 rpm on a 100" gear gives 30 mph (more or less). If you want your RC motor to rev 6000 rpm at 30 mph...
  2. JennyB

    Electric RAAM, anyone?

    Do you have a link?
  3. JennyB

    Ebike Relay Charging Stations

    That was what I was thinking of, coupled with overnighting in hostels or B&B. But my cunning scheme is missing the fast and foolproof charger that would give a decisive weight and cost advantage over doubling the batteries. :(
  4. JennyB

    Ebike Relay Charging Stations

    It would start to get a little tedious, though, if each hour's charge only got you five miles down the road! :?
  5. JennyB

    Electric RAAM, anyone?

    Fermanagh and bordering counties, both sides of the Border. If you are familiar with the Sustrans map, I am just at the junction of the Kingfisher and Northwest trails. It's drumlin and limestone country; there are plenty of small hills, but very little over 1000 feet, and nothing that rates a...
  6. JennyB

    Electric RAAM, anyone?

    Yes, but can you load 480 watt hours into a small battery in that time? That's a load of at least 960 watts, and lots of heat generated if it is inefficient. The Hyperion has a limit of 360 watts load if both ports are used. Miles, I was thinking about about a pedelec system, or rather the...
  7. JennyB

    Electric RAAM, anyone?

    It ought to work here in Ireland, though, where nowhere is too far from anywhere. The idea eventually is to provide a holiday tour package with quality ebikes. Give them a suggested itinerary and pre-booked accomodation, and send them off for a week or so. A full day's touring on one charge...
  8. JennyB

    Safe's Electric Bike Project #002

    Try ABS pipe. http://clevercycles.com/?p=123
  9. JennyB

    Electric RAAM, anyone?

    I'm looking for an electric stoker that can recover as fast as a human one - since it's unlikely that I'll marry Bradley Wiggins! :wink:
  10. JennyB

    Electric RAAM, anyone?

    The Race Across America is the world's toughest bicycle race - 3,000 miles in 10 days, racing for 20 hours a day. In the old days they rested for as little as 90 minutes a day. 50% failed to finish, and most of the others suffered hallucinations. How might ebikes handle such an event...
  11. JennyB

    Pedicab/rickshaw application intro and dilemma

    Can you bolt a sprocket to the side of the BMC hub? Then you could mount it on the frame by its axle so that the body spins and a drives an extra chainwheel.
  12. JennyB

    200 mpg unlimited range hybrid ebike !

    Before I saw the video I thought this was a reference to "Mile-a-Minute_Murphy" They don't make 'em like they useta! :twisted:
  13. JennyB

    200 mpg unlimited range hybrid ebike !

    I was never that good, but there are a lot of tractors on the road here in Ireland. If you drop in behind when they come past at 20 mph, it feels like you are doing less than 10, which is very welcome on a long ride!
  14. JennyB

    Road bike commuter bike build

    No, it's even older than that! :? http://picasaweb.google.com/jennybrien/MyBike Ah, you know a "true cyclist" when he checks out your chainset! :wink: I've been riding this particular bike for 15 years, and there are still lots of places in Ireland I want to explore and revisit, but my...
  15. JennyB

    Road bike commuter bike build

    All good points. It's probably just prejudice on my part since I haven't actually ridden one yet, but ISTM that the rotating mass of a heavy front motor would make your bike handle very differently. I too have a dearly-loved bike (late '80's Cannondale tourer) that I am thinking of electrifying...
  16. JennyB

    Road bike commuter bike build

    That looks a good option. A front motor on a road bike just seems *wrong*. What alternatives are there to the Bionx for a rear hub? Also, have a look at what these people are doing!
  17. JennyB

    40mph safety

    I'd agree with that. I've been to 50 on my touring bike, riding back from the highest pub in Ireland (sober) with a following gale. If I were to do that sort of thing on a regular basis, I would rather be riding a long wheelbase recumbent. With full suspension. And disks. :mrgreen: Good...
  18. JennyB

    Taking the edge off: smaller assist and longer battery life?

    Another thing to bear in mind is that once you go over about 12 mph most of the resistance comes from the air, and that increases sharply the faster you go. Say you output 100 watts, and on a dead flat you can cycle 13.3 miles. Up a 10% grade you could only travel 2.5 miles in the same time...
  19. JennyB

    The Perfect Ebike Frame

    There's a neat standard proposed interface for mid-gearbox bikes. 8) I'd like to see it used for chain-drive ebikes too (motor+transmission on replaceable bottom bracket).
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