On Saturday, February 15, 2020 at 11:55:23 PM UTC-8, wrote:
On Sunday, February 16, 2020 at 12:57:47 AM UTC+1, jbeattie wrote:
On Saturday, February 15, 2020 at 2:30:14 PM UTC-8, Frank Krygowski wrote:
On Saturday, February 15, 2020 at 2:49:36 PM UTC-5, wrote:
On Saturday, February 15, 2020 at 8:00:21 PM UTC+1, Frank Krygowski wrote:
On 2/15/2020 3:16 AM, wrote:
On Saturday, February 15, 2020 at 5:30:59 AM UTC+1, Frank Krygowski wrote:
On Friday, February 14, 2020 at 7:40:02 PM UTC-5, Tom Kunich wrote:
On Friday, February 14, 2020 at 11:23:24 AM UTC-8, Sir Ridesalot wrote:
On Friday, 14 February 2020 12:00:11 UTC-5, Frank Krygowski wrote:
On 2/13/2020 5:47 PM, Tom Kunich wrote:
On Thursday, February 13, 2020 at 2:36:58 PM UTC-8, John B.. Slocomb wrote:

Own Data? You mean like your assertions that a cheap Chinese
flashlight is a perfect bicycle head light? ...

I have taken Steven's word at the effectiveness of "cheap Chinese flashlights as bicycle lights" and he was completely correct. Sorry if you seem to think that you know anything about anything but you have shown yourself to be a great deal heavier on opinion than knowledge of anything.

You say Mr. Scharf was completely correct when he touted cheap Chinese
flashlights as bike headlights. That was when he said dyno powered
headlights were terrible and foolish.

Problem is, Mr. Scharf is now using dyno powered headlights on his
bikes, and no longer seems to say cheap Chinese flashlights are perfect.

My first question is, was he completely correct back then? Or is he
completely correct now?

My second question regards specific details. My dyno powered LED
headlights illuminate the entire width of the lane, and simultaneously
illuminate stop signs up to a quarter mile away from me, all without
blinding oncoming riders.

The Chinese flashlight I tried could not do that, no matter how I
adjusted the tilt and the focus. It was a truly crappy headlight. What,
specifically, does yours do? What's its brand and model?



--
- Frank Krygowski

Some people use flashlights that have a narrow beam but good range. Those lights might be okay as a be seen light but they don't light up much of the road. Others use flashlights with adjustable focus that spread the beams to light of more of the road. the trouble is that when they do that they lose the range they need if riding in totally dark conditions with no city lights.

I really like my CygoLite Rover II light as it does light up the two lanes of the country roads around here and it does so no matter what speed I'm riding at. Also, I can move the battery and light unit from bike to bike easily. I do wish it had a bit more range. For that reason I was considering getting the Centauri or Trident. Dynamo lights simply don't meet my needs.

Cheers

I think that there was a GCN video of a rim driven dynamo light and it was pretty funny because it was just like I remembered it as a kid. As you pushed the pedal down you would get a light and as you were changing over to the opposite the bike would stop from the massive resistance of a 30 watt dynamo. If Frank really uses those things he must ride a bike with a triple and a 26 to 42 gear ratio.

Tom, you have a problem confusing fantasy with reality.

Let me describe a spontaneous, unplanned dynamo test I did once. I've
described it before, but you probably wouldn't remember.

I was on a solo bike tour, heading to Bloomington IN where my kid was
soon to finish college. ("Dad, you've been talking about riding your
bike here. This is your last chance.")

I was on a nice, empty, flat four lane highway heading due west, and
feeling good because I was cranking along nicely at 20 mph despite my
full camping load.

Then I hit a bump in the pavement. After that, I heard some new noise
from my bike, and to my dismay my speed dropped about a mile per hour.

I remember checking for dragging brakes by squeezing the levers and
looking at the brake arms. Nothing. I didn't stop, but I worried
about what damage I had done that was slowing my bike. Then I realized
the bump had caused my generator to click on. I clicked it off and my
speed returned.

So at the power output needed for 20 mph, putting on the generator
slowed me to maybe 19 mph. This was with a bottom bracket generator,
but I haven't seen any real difference with a bottle dyno as I set
them up. And note, this matches Chris Juden's numbers that John
alluded to. Let me know if you need a link.

As always: Sorry for introducing real numbers into a discussion.