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#1
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How many pounds of thrust to keep a bike moving?
I was thinking of putting a small turbine engine on my road bicycle,
just for grins. How many pounds of thrust do you think would be needed to maintain 20 mph? There's a bunch of tiny jet engines for RC airplanes with from 10 to 50 lbs of thrust. Here's one: http://www.franktiano.com/t-750.htm Here's a video of the mother of all RC airplanes: http://www.mcgirt.net/RC/VIDEOS/Gian...52_flight2.wmv |
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#2
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Bruce W.1 wrote: I was thinking of putting a small turbine engine on my road bicycle, just for grins. How many pounds of thrust do you think would be needed to maintain 20 mph? There's a bunch of tiny jet engines for RC airplanes with from 10 to 50 lbs of thrust. Here's one: http://www.franktiano.com/t-750.htm Here's a video of the mother of all RC airplanes: http://www.mcgirt.net/RC/VIDEOS/Gian...52_flight2.wmv It's been done. Vision Recumbents put a 15 pound thrust engine on the back of one of their bikes, and it pushed the bike to 30 mph. Loud mother, too. Pictures and movies of it in action he http://www.outsideconnection.com/gallant/hpv/vision/ Jeff |
#3
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"Bruce W.1" writes:
I was thinking of putting a small turbine engine on my road bicycle, just for grins. How many pounds of thrust do you think would be needed to maintain 20 mph? About 5 lbsf. There's a bunch of tiny jet engines for RC airplanes with from 10 to 50 lbs of thrust. Here's one: http://www.franktiano.com/t-750.htm That one has 95N thrust. At 10m/s (22mph) that is 950 watts, quite a bit more than any cyclist. Your duty is clear. http://members.aye.net/~gharris/blog/shopmod07.jpg |
#4
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It's been done. Vision Recumbents put a 15 pound thrust engine on the
back of one of their bikes, and it pushed the bike to 30 mph. Loud mother, too. Pictures and movies of it in action he http://www.outsideconnection.com/gallant/hpv/vision/ Jeff My vote for best link of the day. Week. Month. Maybe year. This is better than hamsterdance.com or whatever it is. --Mike Jacoubowsky Chain Reaction Bicycles www.ChainReaction.com Redwood City & Los Altos, CA USA |
#5
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On Wed, 04 May 2005 22:57:22 GMT, "Bruce W.1"
wrote: I was thinking of putting a small turbine engine on my road bicycle, just for grins. How many pounds of thrust do you think would be needed to maintain 20 mph? There's a bunch of tiny jet engines for RC airplanes with from 10 to 50 lbs of thrust. Here's one: http://www.franktiano.com/t-750.htm Here's a video of the mother of all RC airplanes: http://www.mcgirt.net/RC/VIDEOS/Gian...52_flight2.wmv Dear Bruce, At $2795 plus shipping plus tax plus earmuffs plus public nuisance fine plus fuel at 11 ounces per minute, it will be an expensive grin. Slightly off-topic, but why do they come up with 24 pounds as equal to 95 newtons? Everywhere that I looked, 95 newtons converts to about 21.36 pounds (9% lower than the claimed 24 pounds), while 5 newtons ends up as 1.124 pounds (12% higher than the claimed 1.0 pounds). http://www.onlineconversion.com/weight_all.htm Are they using troy newtons, imperial pounds, nautical thrust, or what? Am I just missing something obvious? Persnicketily, Carl Fogel |
#6
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"Bruce W.1" wrote" (clip) How many pounds of thrust do you think would be needed to maintain 20 mph? (clip) ^^^^^^^^^^^^^^^ I assumed that 1/4 HP would do it. That's 550/4=137.5 ft lb/sec. 20 MPH = 29 ft/sec. Power = force x velocity, so the force comes out 137.5/29= under 5 lb thrust. A rider developing 1/4 HP has to provide the power train losses, which the jet engine bypasses. OTOH, my figure of 1/4 HP is just a wild-ass guess. I imagine there must be SOME combination of rider, bike, clothing, riding position, etc, that would consume about that amount of power at about that speed. |
#7
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On Wed, 04 May 2005 22:57:22 GMT, "Bruce W.1"
wrote: I was thinking of putting a small turbine engine on my road bicycle, just for grins. How many pounds of thrust do you think would be needed to maintain 20 mph? There's a bunch of tiny jet engines for RC airplanes with from 10 to 50 lbs of thrust. Here's one: http://www.franktiano.com/t-750.htm Here's a video of the mother of all RC airplanes: http://www.mcgirt.net/RC/VIDEOS/Gian...52_flight2.wmv Real jet-powered vehicle experimenters build their *own* engines. http://www.aardvark.co.nz/pjet/ And a gas turbine is useful for more than just generating thrust; it can also cool your beer while making painful amounts of noise! http://www.asciimation.co.nz/beer/ -- Typoes are a feature, not a bug. Some gardening required to reply via email. Words processed in a facility that contains nuts. |
#8
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"Bruce W.1" wrote:
I was thinking of putting a small turbine engine on my road bicycle, just for grins. How many pounds of thrust do you think would be needed to maintain 20 mph? I'm not sure, but I know it takes a lot more thrust that you get from a medium-size leaf blower (gas powered). I expected to be pushed to at least 5-6mph (8-10km/h) but alas, it barely moved me at all. All noise, no thrust. Now all I am left to do with it is to blow leaves. Harumph. Mark Hickey Habanero Cycles http://www.habcycles.com Home of the $695 ti frame |
#9
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JeffWills Wrote: Bruce W.1 wrote: I was thinking of putting a small turbine engine on my road bicycle, just for grins. How many pounds of thrust do you think would be needed to maintain 20 mph? There's a bunch of tiny jet engines for RC airplanes with from 10 to 50 lbs of thrust. Here's one: http://www.franktiano.com/t-750.htm Here's a video of the mother of all RC airplanes: http://www.mcgirt.net/RC/VIDEOS/Gian...52_flight2.wmv It's been done. Vision Recumbents put a 15 pound thrust engine on the back of one of their bikes, and it pushed the bike to 30 mph. Loud mother, too. Pictures and movies of it in action he http://www.outsideconnection.com/gallant/hpv/vision/ Jeff Any idea on what happenned to the Jet Sabre in the ATP-Vision auction? Tim Arfons (son of Art Arfons) used this 90 hp JFS 100 13A turbine in powering a bar stool over 40 mph powered http://www.turbinegroup.com/page2.html to get into the Guiness book for the fastest barstool. This company makes the race track dryers you see at major oval/drag racing events. Here is the jet powered Penny Farthing page: http://www.pennyfarthing.dabsol.co.uk/pulse-je.htm |
#10
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Bruce W.1 wrote:
I was thinking of putting a small turbine engine on my road bicycle, just for grins. How many pounds of thrust do you think would be needed to maintain 20 mph? There's a bunch of tiny jet engines for RC airplanes with from 10 to 50 lbs of thrust. Here's one: http://www.franktiano.com/t-750.htm Here's a video of the mother of all RC airplanes: http://www.mcgirt.net/RC/VIDEOS/Gian...52_flight2.wmv A Several of years ago one Paul Ford fitted a jet engine to a Windcheetah recumbent trike. 50 mph and 180 dB... Pic at: URL:http://www.micro-jet.freeserve.co.uk/jetbike.htm -- Dave Larrington - http://www.legslarry.beerdrinkers.co.uk/ Whatever it is, I'd like it in mango & passion fruit, please. |
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