school project, maybe.

[sideways]

There would be no more painful vehicle to have a rod a flywheel blow in.

You could make it electric too.

Thanks

Hayden

 

[r97]

i thought about a mountain bike spring but don't you think it would be pretty costly? and i'm not sure hoe well it would fit. right now i'm thinking about a way of making a tensioner (thats what i'll call it for now) with just a few nuts and bolts.

i did think about electric, but i think it would be a bit costly, and i'm looking forward to making my exhaust (splits into two pipes from engine, each pipe swoops along either side of the frame, then both pipes shoot out the back and both split into 3 pipes , each with rain flaps

as for the flywheel, i'm not planning to remove the gov, so hopefully no problems there!

 

[r_chez_08]

what are you doing about brakes?

 

[r97]

probably a band on the jack shaft, i have also thought about a clutch brake, not sure its worth the risk though....

 

[r_chez_08]

the band is probably the best way. or feet
what are you going to gear it for?

 

[redsox985]

I think you could find on of those springs like the ones Bigair used on his power wheels jeep.

 

[r97]

just looked, i guess if i get some small shocks (4 3/4") there only about 15 bucks, so there not that bad. i'll go check to see if the will fit in the frame.


EDIT: not sure about actual ratio yet (i will decide once i'm sure on what i use for my friction wheel) but i'm aiming for a top speed of 15mph.


EDIT: just checked, unless i change the frame around the shock won't fit. i also noticed i'm going to have to move the roller thats under the engine over about a little bit so it clears the 2" frame.

 

[Bluethunder3320]

15mph would feel like 90mph on something like this!

 

[r_chez_08]

15mph would feel like 90mph on something like this!

It would be hairy going past 20mph!

 

[r97]

going past 20? i think i would be tumbling on the pavement by 17!

i finally got a response back from max-torque, there is a place i can get the part. unfortunately i forgot to ask if i would need a new sprocket, so i'll decide whether i want to get a whole new clutch, or convert the 5/8" one.

i also made up a little parts/materials/tools list, looks like the metal is going to cost somewhere around 100 bucks! ouch! i'll see what i can find at the scrap yard. the good news is my parents will pay for half of it since its a school project !

i'm trying to decide on my engine, it looks like i have a few 5hp Tecumseh's, and brigg's on craigslist for about 50 bucks OBO, so i was thinking i could get one for maybe 35 or 40 bucks.

i'm also going to try to make a model of what i plan for the exuahst.

 

[r97]

heres the exhaust! well this is kinda what its going to look like, as you may notice i'm horrible at drawing exhaust pipes in sketch-up. i got the curve wrong, it will actually swoop up to the engine not the way it is in the pics.

the exhaust starts as one pipe, then splits into two. after that one pipe goes down one side, the other pipe goes down the other side. then they both come out the back and each pipe splits into 3, all 6 of the pipes at the end will have rain flappers!


wait a minute! i just got the best idea ever!!!!! what if i were to run a pipe from the engine into the sq tube frame. then two pipes will pop out of the sq tube frame at the back. and maybe i will even split each of those pipes into two or 3 pipes! heated seats anyone?

 

[Bluethunder3320]

Lol. Yeah make the exhaust go into the frame. And then just like a dinosaur scales down the back make lots of short pipe openings.

 

[Lynx_Genisys]

haha.. this is very cool.. and i cant wait to see it finished

just curious, but is this the first mono wheel construction on the forum?

2 things that kinda came to m mind while reading this thread..

the more rollers you have, the more stable it should be, but a few extra under the seat would make it extra stable..

the other thing i was thinking..

if you stop take a step back and look at it, essentialy what you have is a mini bike..

now hear me out..

look at it like this.. take a mini bike, and stick it inside a huge 4 foot pipe/culvert/whatever.. now drive forwards.. the bikke moves, it rolls..

now make the the pipe the same width as the bike.. now make the inside of it rounded, and run on rims without tires. (Imagine they have good traction and dont just slide and spin on the pipe...

now run a frame around the inside of the bike,with a few extra rollers along it to "Lock" the bike onto its track..

now rivet bcylce tires around the outside of it for traction..

now you have a monowheel..

of course thats a fairly rough and simple way to look at it.. now it all makes sense to me..

simplifies the linkage and how to turn the outter wheel, stop. also the wheel would turn/move at the same speed as the minibike would outside the wheel.

if you had a wider flat out side edge, it would be easier to balance and ride, but harder to turn i would imagine..

I think skateboard or even roller blade wheels would work great..

as for the outter traction/tire, i think riveting a bike tires around it would work out good.. and it would be quick and simple, to get the project done for school..

then you can always upgrae it after.. D:

for the diameter of the pipe, and getting it bent, find on old hobbiest or metal worker kinda guy, any farmers etc, they know all sorts of things on how they could accomplish that.. or even use a sliced piece of round tubing.. you could prolly get some as scrap from various fabrication places, that make pipe or flare stacks or all sorts of thigns.. just think big round things, who makes it.. lol

then wrap the inside with something like super thick, but flexable tubing.. pcv or heavey duty industrial hose.. cut it in half..

or even make a track inside with angle iron or whatever to "Drive" within and use normal tires instead of rollers...

i do like your idea better tho, and perhaps you can find a mandrel bender.. but i think for that radius, you may be better off finding someone that can heat and bend pipe, wrapping it around something with the right radius to arch it.. proll have to make it in 2-3 sections, then weld it to a full circle..

anyways, just thought id toss out some suggestions/ideas/my thoughts on it..

cant wait to see it!!

Dont know why, but when i think mono-wheel, i think steampunk!

haha

good luck!!

~L~

 

[Lynx_Genisys]

holy hell!

http://www.youtube.com/watch?v=K4YmVP6i4qw

are you sure you wanna make one of these?? I would keep it slow myself..
evenonce you are comfortable it looks so easy to suddenly loose it..

poor guy gets spun around inside of there and then flung out and it lands on him by the looks of it..

 

[r97]

yea i saw that vid, thats why i will have a top speed of 15 mph, max!

the main reason i'm staying away from 4 rollers is because i would need the bottom roller to be very strong, and adjustable. also, i bet the drive wheel would be taking some weight.

as for bending the rim, i'm not planning to use a tubing bender, i'm planning to use a tubing ring roller, which i hope i can find a shop with one locally.

thanks for the ideas though they are always welcome! i cant wait to get started!!!!!!!

 

[r97]

ok, i was just talking with my mom about the mono wheel and i threw out the idea of the mini bike again after she asked me how much the mono wheel might cost. after a bit of talking what we came up with was basically a list of pros and cons.

mono wheel pros:
very interesting science fair project.

mono wheel cons:
expensive, i finally came up with a rough estimate, 450 to ?, thats not very good.....
variables, can i actually make the rollers? can i actually get a ring rolled? will the drive system actually work?
not sure i can actually drive he thing in my neighborhood.

mini bike pros:
inexpensive, $230 estimate
no big variables, i have all the foreseeable large problems figured out.
will have a use.
can be ridden in my neighborhood.

mini bike cons:
i guess its not quite as interesting.

as much as i hate changing plans all of a sudden, i might have too, i would need to have everything tested and ready for paint by early march, and i'm not sure if i can or cant do that with the mono. i think i can do it, but it might be better to file the project away for now so i can make sure i don't rush the project and end up with a piece of crap. i think i will let the thoughts mingle for a little while.

 

[r_chez_08]

What about an overpowered electric pocket bike?

 

[r97]

that could be interesting, but maybe expensive? motor, controller, throttle, maybe 3 batteries. that could be like....... 450 dollars! i could just do an electric one for like 40 bucks for all the electronics, but that wouldn't be half as fun. i guess there is the starter motor option, that could be kinda a best of both worlds deal, but it might be a pain to get a sprocket hooked up to the motor.

 

[r_chez_08]

yeah true. electrics can get pricey, as i saw a 1000w 36v motor on ebay for £100. you then need £100 worth of batteries and £50 worth of controller .
i thought pocket bike so it is small and doesnt take up much room, electric so it isnt too noisy around school, and powerfull to impress people!
couldnt you just bodge it on the starter motor and weld a sprocket?
Rob

 

[r97]

true, i guess i didn't think of just welding one right on, other than not being able to remove it thats a good idea.
i'm gonna look into the electric a bit more, would be cool. as for making it electric for being around school, not a huge deal, it will be at school once, but i will use it twice a week at home, but it might be nice to give people demonstrations.