Showing posts with label Planet Bike Superflash. Show all posts
Showing posts with label Planet Bike Superflash. Show all posts

Sunday, October 2, 2011

Techie Tuesday: The Emergence of the Electric Bike

Looking around for after-market batteries for my new MagicShine, as a 2nd 7.4v pack seems like a good investment, I noticed that Shimano has pushed their DuraAce Di2 electronic shifters down to the Ultegra 6770 level, and the price is ~ $1,500 street.

Since I have set up a charging station now right next to my bike, so I can plug in and charge the Garmin and the MagicShine, I was immediately curious as to what voltage the LION battery was that powers Shimano's shifters.

Electraglide in Grey
The Di2 system uses the same 7.4 volt standard as the MagicShine, and most other lights high-powered too I might add. That's nice, because the rather small Shimano battery lasts for hundreds of hours, so its not very power hungry, and with the same voltage, a stub with a Y connector to the MagicShine's battery would make the Shimano one redundant, and save some weight and drag.

Why would you want electronic shifting? Because indexed front derailleurs are a PITA. For every rear chain position there is a different front chain position, and a different shifting strategy depending on where you are and where you are going. The control inputs are also just taps, and you can tap through 10 gears in back without any delay or hesitation, and the front derailleur takes care of itself. 


This still leaves me with 2 AAA cells for the Planet Bike SuperFlash taillight, which I will be upgrading to SuperFlash Turbo. (I had to offset 2ft to the side and 4ft back to keep from getting blinded.by Steve's Thursday night. So much for the uber great tandem draft), and 2 AAs for the Planet Bike 1W Blaze in front. (could you PLEASE, make these all AA cells?)

Currently, the MagicShine runs on 7.4V, the Garmin on the 5.0V USB standard, and the other two lights on 3.0Vs. This is a mess. What is needed is an on-bike converter that uses clear, flat, urethane ribbon cables that have a Post-It Pads sticky glue and flat silver ribbon wire connecting everything with a pronged battery pack connector system that allows you to connect multiple packs together depending on power requirements. Obviously, this power management system should also charge everything from a single wall charger.

Looking at the emergence of the quad-bulb lights up front, and the effect of a 29.6v, 8-cell LION system in chopping the wire size to 1/4th of it's current size, I think bikes should, and probably will follow the example of aircraft, and develop higher voltage, lower current power systems.

Now if someone would just develop an on-bike generator that wasn't the size and weight of a cheap 11-36 mtb cassette....

Tuesday, December 7, 2010

At Odds with Ends

So it's December, and winter weather is upon us, so it's time to hang up the cycling shoes for the year and hit the gym, right? Run everything through the laundry, hang it in the closet, stay home, and grow a spare tire? Uh, yeah, but not so much around here. Still nice to have the gym as a backup, but so far the wx has been pretty good.

It was in the mid-60s yesterday, so I had to do a little head-scratching about what to wear before heading out the door for Beals Pt. It was a gorgeous day, and kind of weird that, being a Monday, the trail was almost abandoned. After 6 days off it was a slow and sluggish ride for the most part, but that's just fine. Some Base Level I riding is a good idea this time of year anyway.

Last week I did a nice 38 mile ride up into the El Dorado Hills to get in some practice for our New Year's Day hill challenge, but got there about 20 minutes too late, so reluctantly headed for home over the Johnny Cash Bridge and took in the always spectacular view of the lake while hitting 30mph going down a 6% grade.

Once over the bridge, I got on the ARPT, crossed under it, and stopped to take in the view while donning my PI convertible jacket's sleeves, thus turning the vest into a jacket. In last week's cooler, drier weather this was perfect.  Last night, in spite of wearing a short sleeved summer jersey yesterday, wearing the sleeves coming down from Beals left me soaked in sweat. I'm talking about wet T-shirt contest, pasted to my skin soaked.

Although the fall foliage on the ARPT was breathtaking, the crushed, wet leaves, mingled with twigs and small branches, required a slow pace, especially on the descent from Beals. There was also a fair amount of mud and sand on the trail, so my jacket was spattered and bike filthy when I got home. I need a dedicates bag. Winter clothes are a challenge to clean and dry in the shower due to their sheer bulk and size.

For the bike, I'm going to try the vacuum cleaner with hand brush for the big chunks, and then a clean towel and TurtleWax car shampoo to get it nice and shiny again. It's Tiger Woods in a Vegas whorehouse filthy!

When I got home from my 38 miler last Tuesday, I discovered my tail light had fallen off. I was a little alarmed that I had crossed Fair Oaks blvd without it, as it's 4 lanes of heavy traffic and a dedicated turn lane. I always cross into the turn lane at the crest of a hill where traffic from both directions can see me, but doing so without a tail light is still dangerous.


Wanting to ride the next day, I headed off to REI the same evening and picked up a Planet Bike Blaze/Superflash head and tail-light combo for $48 with a 20% discount. I found a 1/2 watt and a 1 watt combo and went with the 1W, duh. If you already have a tail light you like, I'd go with the 2W Blaze, which uses a CREE XR-E Q5 lamp to produce 100 lumens. Such a pleasant relief to get to Beals last night and NOT have to be checking the time to make sure I'd get home before dark. Headlights rule!

The mounting system wasn't big enough to get around my handlebars, but I tossed the plastic strap and used a bit of the grippy rubber strip from the tail light under a zip-tie, and that worked very well. If I remount it I'll just cover the zip-tie with vinyl tubing like I do with all my zip-ties. It's cleaner and the edges don't curl up. I mounted it upside down next to the stem - slung under the main bar - which is out of the way and provides good vertical separation from the aerobars.

The light has a front bulb section, and a rear battery section that houses 2 AA batteries. The front attaches with a twist lock that only needs about 2mm of twist to disengage it. No way is that going to be reliable, so I immediately cut a strip of Velcro lengthwise and stuck one half to each half of the light. I then wrapped that loop-side Velcro with a Velcro strap's opposite, hook side. It's totally locked in place now, and if I were to drop the light it would be protected from breakage in the bargain.

I did some testing with my 1W light, rated for 7/14 hrs on hi/lo setting, and my wonderful Duracell 2650 AA cells kept the light going for 15 hours on hi!(these excellent batteries were reformulated and are now complete crap. Try the Sanyo Eneloop instead). Somewhere between 10-12 hrs though, the light transitions from a 'See' to a 'Be Seen' light imho. For the 2W, which produces 100 lumens instead of 70, burn time would be 7-9 hrs.

Finally, my new, replacement wheel arrived from Colorado Cyclist, and as expected, is just completely new through and through. I had repacked the hub a week before finding the SUP weld problem, so checked the hub on this one. It's a new hub.

PS: After looking into the MagicShine bike light, I think I'll use this one as a backup or forward flasher. At 900 lumens, the MagicShine far outclasses either of these Planet Bike lights. Here's the technical specs on the Seoul Semiconductor LED that powers the MagicShine light.