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I've ridden thousands of miles on patched tubes with nary an issue. When done properly, they're as reliable (more, actually) as any other (original) seam in the tube-- they vulcanize the rubber making it one big piece of rubber, patch and tube together! The only real downside is that it is a...

Medium-term review of the TyreWiz doohickies. They work! Not only do they work, they work well enough that I can tell which segments of the road have been in the sun and which are in shade by looking at the graph of tire *pressure*. Pretty cool, if you ask me!

In my case with the programmable height based on angle thing, sure it affects trail/rake in minor ways, though the system of any tilting bicycle is more complex than you'd likely think-- rake/trail change when turning the steered wheel anyways for any bicycle. In the case of changing height for...

Yours may be similar/same, but the again it may be different. I have designed a number of other variants of mechanisms to do programmable distance of rear end based on tilt angle (do a search for "balance assist tilting trike" for examples). I have a method that does the same thing using...

Amazing trip(s)! Looks like it'll be a blast!

If the frame itself was the outer container for the other energy storage/capacitance stuff, perhaps we could decrease the additional weight some fair bit? Call it 'structural capacitors'

If you want to look at efficiency, you need to consider the whole system, which includes the human (motor). Our motor is pretty efficient at low power, and much less so at sustained high power. Which leaves the middle... So the question of efficiency begs the question of how much "smoothing...

The swing arms looked pretty engineered to me, though.

I don't grok it. It looks like a standard swing-arm and bellcrank setup. What is new about it?

Conversion kits?

That bar end mirror has probably the worst cda component of anything on your bars...

I was taking a turn in Florida when some sand made me fall. Sounds like I had a very lucky fall comparatively-- I was going 20ish and just had some road rash along my right forward and outer thigh. The bike got some handlebar scrapes and scrapes along the outside of the chainwheel/crank. My shoe...

Materials are interesting. It isn't so much about the failure, but more about how they fail. Carbon fiber has some similar stress-fracture properties as Aluminum, worse in some respects as the crack tends to propagate faster that it likely would in aluminum (or steel or titanium). This...

Seems like there would be more skin drag, as you've added significant surface area (especially if you avoid the human inside)?

I have some old papers from the 90s where I had a combined suspension and hydraulic drive. The base idea was to put the energy from the bumps back into the drivetrain. You could do this without hydraulics, sure, but I was a kid imagining as kids do! You could imagine using this as a bounce'...

Amusing numbers: In November (last month I commuted by bicycle, having had tonstop thanks to the fires making the air grey), Garmin Connect reported that I rode faster than 84% of riders, yet was only 31st percentile of power output. That is pretty fascinating. 84th %ile in speed for 31st %ile...

Dang, that sucks. :( If you can't find a boom, then I bet you could get a new handlebar interface made and welded on to replace the current one.

That looks correct to me. In gory detail: D = Cd * A * .5 * r * V^2 Cd == coefficient of drag A == frontal area R == fluid (air) density V == air velocity Note that Cd there includes, to quote NASA docs, "form drag, skin friction drag, wave drag, and induced drag components".

There are other losses in the system, not just aero: drivetrain, ground friction, etc. not to mention body dynamics. Aero dominates at higher speeds.

Definitely the case-- headwind saps energy to the square of it's relative speed. Tailwind allows higher speed of about the tailwind speed (there is still rolling resistance, but aero dominates, so it is mostly about the wind plus the wind you create by moving through the air). 10mph headwind...