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Description
Design of Human-Powered VehiclesThis book is about the design of vehicles with wheels that are powered by human muscles alone. These can provide affordable, sustainable, and healthy transportation to people around the globe. The term Human Powered Vehicle, or HPV, is sometimes used to denote a sub class of vehicles including only high performance bicycles or tricycles equipped with aerodynamic fairings. More generally, the term refers to any semi recumbent bicycle. But the term
This book is about the design of vehicles with wheels that are powered by human muscles alone. These can provide affordable, sustainable, and healthy transportation to people around the globe. The term Human-Powered Vehicle, or HPV, is sometimes used to denote a sub-class of vehicles including only high-performance bicycles or tricycles equipped with aerodynamic fairings. More generally, the term refers to any semi-recumbent bicycle. But the term should properly refer to any means of carriage, conveyance, or transport that is powered solely by human muscles. This book is limited to design of human-powered vehicles for land use. There are many reasons why the design and use of such vehicles is beneficial. In developed countries, using an HPV in lieu of an automobile (or in lieu of a second automobile for a family) can save $5,000 to $10,000 each year, while improving health and reducing emissions of greenhouse gases and pollutants. Greenhouse gas emission will be reduced by more than 4,000 kg per year due to the corresponding reduction in energy consumption of more than 17,000 kWh. In addition, infrastructure for cycling is far less costly than highways designed for automotive traffic. Human-powered vehicles were originally designed for transportation, and that is still their most important use. HPVs today provide clean, quiet, and efficient transportation. Perhaps the most compelling reason to use HPVs is sustainability: the environmental footprint of HPVs is typically much, much smaller than that of other modes of transportation. Despite these commonalities, HPVs are used by a variety of different people for a wide range of diverse reasons, including recreation, competition, cost, health, transportation, and concern for the environment. The contents include manufacturing processes and materials, performance modeling, handling, drivetrains, structures, components, human performance, and design strategies.Shipping Notes
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4.4 ★★★★★
Based on 29 reviews
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Product Reviews
★★★★★ 3
Whish it was brighter
Color: White
It is ok, but I thought it would illuminate better.
It provided some light right underneath, but it does not open up more lighting around. It barely expends to the whole length of the table.
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Reviewed in the United States on October 4, 2024
★★★★★ 5
My favorite pimple patches
Style: Bundle, Size: 2 Piece Set
I've tried the competitor Mighty Patches and a couple other pimple patches. These are my favorite because they stay on the best and do the best job of healing/absorbing. The Microcrystal Spot Cover actually hurts a little when you put it on from the little spikes... but I love that because I feel like it's actually doing something! I wish they were a little more affordable.
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Reviewed in the United States on November 19, 2025
★★★★★ 5
Expensive but effective
Style: Bundle, Size: 2 Piece Set
This isn’t a miracle cure for acne, but it has proven beneficial for reducing redness and shortening healing time, in part because of how it works and also just as a barrier to prevent picking. Product does what the packaging says it will do. These dots are impressively thin. As the fluid is drawn into the patch, it creates a more pronounced white bump, but it is still thinner than typical extra thin hydrocolloid dressings.
If you’re planning to walk around and be seen while wearing acne patches, these are a great option, even if they are expensive. If you’re going to be primarily wearing patches while you sleep and are at a place in your life where you just don’t care how it looks as long as it works, shop around and cut a patch to size from a large (4”x4” or so) hydrocolloid dressing, and it will do the job just as well.
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Reviewed in the United States on February 11, 2020
★★★★★ 4
Worked well, comfortable.
Style: Bundle, Size: 2 Piece Set
These patches adhere fairly well to my chin, over a very large cystic pimple. I admit, the microneedle patches I used before caving and picking were the Kill brand, not Rael. I figured I would buy both on the off chance I ised all the Kill stickers (whose price tag is honestly ridiculous). After the zit popped though, I found this brand to be preferrable to my usual HERO staple for a number of reasons:
1) While the hero patches are bigger and thicker, this brand was more comfortable to wear long term. As I was treating during my work day, I felt more confident with these thin, flexible sheets than with other brands. They're thinner, but seem to work just as well and are more comfortable.
2) They're practically invisible on my face. Now, it's not really possible to make these things disappear entirely. Because they're thinner, they do wrinkle some when I speak and tend to stretch on the skin. I will say that this recurring zit does live on my chin, so there may be more movement and wear as a result.
3) I feel less inclined to change them early. Because they wear so well, this brand was much less noticable on my face. I couldn't feel it and in fact, forgot it was there until I took a bathroom break. That made it easier to focus on getting work done rather than worrying about how it felt or looked. I did wear a tiny bit of concealer over these and no one seemed to notice.
Overall, pretty good product.
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Reviewed in the United States on March 12, 2020
★★★★★ 5
Magic Spots make your acne..DISAPPEAR!
Style: Bundle, Size: 2 Piece Set
I like this product. I was nervous cause I am allergic to everything. However I got an ingrown pimple right under my nose. It hurt like a mother. So I bought these in hopes it would eat it off my face and I was pleasantly surprised. I put the one that has the crystals under my nose overnight. This morning it ate all the sebum around it and left a weak white head. When I removed the white head, I had a pretty decent hole under my nose. I put a dot from the pink box on it after disinfecting it and drying it off in hopes it will keep it protected while I wear a mask at work. I also had one in pink box on the side of my face in hopes of helping a ragged acne that I had scratched of the scab in my sleep the night before. So it was pretty rough skin. I slapped the dot from the pink box over night as well and my skin is soft. Its still a little red from where it was but its not raised and it doesn't hurt. These are pretty awesome. The adhesion sticks all night did not move ONCE. It was almost like removing a bandaid. They stretch well and fit over most acne spots and they are thick enough to not tear easy and hold all the gross that comes out of your face. I had no real expectations of the product because I wasn't sure how this face magic worked but it definitely does the trick when you have painful ingrown and just stubborn acne spots.
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Reviewed in the United States on February 3, 2021