h a l f b a k e r yAsk your doctor if the Halfbakery is right for you.
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ok, you're biking along a a reasonable pace after a long day,
when suddenly a huge dog starts chaseing after you cause
some idiot forgot to lock him in. because you have little
energy left because of your long day, youv'e gotta do
somthing to get away from that darn dog! so, with my idea,
you
flip a switch cover on your handlebars, push a button,
and
hang on for the 5-15 seconds the multiple model rocket
engines
burn. when you get home, just insert new cartriges,
because
most model rocket engines have a reversed direction burst
to eject
the parachute, or in this case, themselves. and in addition
to
the extra burst of speed, you would also have a cloud of
smoke behind you as a screen, and leave behind several
smoldring tubes of cardboard for that dum mutt to bite. of
course, the engines in the front wheel would have to be
bigger or more numerous then the ones in the back, to
avoid
flipping on your head. could also be turned into a new
sport,
street drag biking!!! of course, there would be the problem
of
the spokes melting, so they would have to be made more
heat
resistant. now have fun, and wear a Helmut!
Jet Bike
http://www.amtjets....lery_jetbike_md.htm
Simpler solution, put a jet on the back [PiledHigherandDeeper, Oct 04 2004]
Rocket Powered Luge Board
http://www.the-rock...n.com/luge2001.html
119 mph on this machine..... [normzone, Oct 04 2004]
[link]
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I have a squeeze-bottle of ammonia handy in a second bottle cage, just for situations like this... it seems to take the "fight" right outta' almost any dog. (Even the really stupid ones.) Have you considered simply strapping on the ACME™ jet backpack instead? (ala Wyle E. Coyote) meep-meep! |
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I dunno, 7 pounds of thrust for 4 seconds sound like a pretty good kick to me. |
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You'd probably want to chain them in series rather than parallel; it's the burn time you want to increase, not the thrust. |
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I'd like to see someone try this -- from a distance. It's hard to imagine that some bored and foolhardy teenager hasn't done so at some point; Estes rocket engines are pretty widely available... the biggest concern I have is not that anything would catch fire or melt but rather that once ignited you can't turn these engines off, so I hope you don't need to stop. |
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[thcgenius] for those people who are poor and can't
afford expenses like that,then they can go to a indian
reservation and buy them, or the manufacturer of the
rims would almost certainly provide a source for the
propellent. and for those people who are REALLY rich, a
special bike that holds high octane gasoline and NOS, for
pulse-jet rims. or people could try making their own rim
engines with re-useable casings. but pulse-jets might be a
little rough and heavy, and hard to ignite on a bicycle size
scale. |
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Are you sure you wouldn't rather attach the engines to the frame? Or are you after a pinwheel effect? |
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It seems like ordinary brakes should be able to cope with an extra seven pounds of thrust. If you get something more powerful in an arms deal or use a bunch together, maybe you could have them held in brackets that clamp onto the brake cables when you push the red button and then release the engines if you touch the brakes -- hopefully sending the engines flying harmlessly ahead into whatever you were braking to avoid. |
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//It's hard to imagine that some bored and foolhardy teenager hasn't done so at some point//
I hate to admit it, but I did it once, and only once! Had 2 pices of pipe bolted to the spokes of the back wheel, sliped in 2 class-D eng's and let them rip. The boost sucked, plenty of smoke, hit the speed bump I was going to launch a jump off, and poped the back tire when I landed. It was the funniest thing in the world to see, at least to every one watching. Hurt my pride a bit =o(
from experiance may I sugest angleing the rockets away from the tire. Just wondering, how exactly will you ignite them? We did it from a stand still. |
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And here I thought I was the only one looney enough to do this. I plan to use two D's, (that's all I have right now, later I wanna make home-made)strapped to the frame, and ignite with a small battery and switch. I'll do this on the fly, after I get up close to 30mph or so. |
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Hear's some math to dampen your spirits! |
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7lbs./150lbs*5seconds*32=8ft/sec. speed increase=~5MILES PER HOUR! |
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Presurized gasses and air moters are more effective... |
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See link for rocket powered luge board speed record
....... |
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