Joe Braxton wrote:
Len Ovens wrote:.... I wonder how much noise they make.
From experience, you will definitely need a muffler. A smallish inner diameter w/ air pressure above, say 50 psi, and no throttle will exhaust at super-sonic speeds.
The ones I've used were for cooling on milling machines, I could freeze ice on the exhaust tube in a 80 degree F shop.
paul wheaton wrote:Somebody sent me this today:
removed video to save space - air powered bicycle
The video is five years old, but still very relevant. I think the way that it projects in bursts is something I have not seen before! Cool!
He mentions that compared to running the same thing on petroleum that the petroleum approach would cost 100 to 200 times more.
Norbert Esses wrote:
As a member of the Bosch Group, Rexroth and Aventics pays particular attention to those initiatives that engage in raising environmental awareness, deal with the question of alternative energy sources and the efficient use of natural resources.It was this spirit that initiated the Rexroth Pneumobile Competition a few years ago. In this creative and innovative competition the participating students have to design and construct compressed air-driven vehicles before putting them through their paces at an event consisting of a number of categories and disciplines. During the course of the design and production process the students gain first-hand experience of pneumatic, that is to say compressed-air technology, while at the same time they become familiar with Rexroth products. On top of all the program presents an ideal opportunity to tighten the co-operation between the Bosch Rexroth companies and the technical universities and colleges in Hungary.
Brian Pettit wrote:Andrew,
Thank you for posting the exact same link I had attempted to access before, but mysteriously would not work for me, and now it does and I hope it will for everyone else as well. It has been quite discouraging for me to know that this technology exists for so many years and to NOT see it being widely publicised as an option IN THE LEAST. It just seems to me to be the ultimate form of not only transportation and utility vehicles but an engine design for EVERYTHING that requires rotation within and around the home because literally, there is no special skill or strength or "minimum income" for people to make use of it. It appears that this engine does not even require the huge amounts of pressure nor "battery capacity" to operate.
How difficult would it be to hinge the entire passenger compartment along with the holding tank to the front bumper and place a piston or two between it and the drive frame and just use the bumps in the road as a recharge mechanism (or just sit and bounce for a few minutes?) that also supplies shock absorption, some simple compressor heads on the wheels for brakes that also recharge the tanks, and even light weight sails, turbines, pendulums, whatever to simply compress air? And as the website states, the air that is expelled ends up being even CLEANER than the air that was collected to power it in the first place!
Brian Pettit wrote:
(E=MC squared, so increase in MASS equals increase in energy).
The Di Pietro Motor is a 94.5% efficient compressed air motor that can run on energy from sustainable sources such as the sun.