|
|
Post by breesfan on Feb 8, 2015 19:08:25 GMT
The car to motorcycle one was a tad boring but I didn't think it was going to work.
The bike in water was more interesting even though I'm not sure you'd want to use a bike on water when your shoes get wet.
|
|
|
|
Post by the light works on Feb 8, 2015 23:34:15 GMT
aqua bike: pretty much a case of WYSIWYG. would I have done a different design? you bet. I'm guessing if you rolled enough identical bikes into the shop for each of us, (along with a tech for those of us less confident with power tools) we would roll out with as many different designs as there are of us. my biggest perceived flaws were that with the front pontoons directly connected to the front forks, sharp turns would cause balance issues, and they really needed to be in a lower gear. how to fix? I'm not sure, unless to make it so they were somehow on a pivot from the front end and held in line with the rear pontoons. that would necessitate a solid disc front wheel for a rudder, and/or build them so the pontoons steered on a tie rod linkage. for the lower gear issue, I would simply build my paddlewheel asymmetrical so I could still use the gearset. no cure for the wet feet. car into bike: first, kudos on the 2CV. second, I'm really only going to criticize the result. based on reading the alleged journal, I can say they apparently got exactly the same results as the writer of the journal did. a nearly unrideable beast, that he would have quite possibly been better off without. so, no, technical question for those who live with those little doodlebugs: is the 2CV engine a 2-stroke or a 4-stroke? The wikipedia page, while a fascinating narrative, does not say. en.wikipedia.org/wiki/Citro%C3%ABn_2CV |
|
|
|
Post by GTCGreg on Feb 9, 2015 0:09:28 GMT
Note the valves. Definitely a 4 cycle  |
|
|
|
Post by the light works on Feb 9, 2015 1:05:48 GMT
Note the valves. Definitely a 4 cycle well, that leaves out the possibility of running the motor backwards. |
|
|
|
Post by Antigone68104 on Feb 9, 2015 14:22:16 GMT
It's too bad the rear bumper had those vertical pieces on it. Obviously it wouldn't have worked on the runway, but on sand a pair of bumper pontoons might have helped with the stability issues.
The bike mods were interesting, though you'd want to have a change of clothes available once you got to work if that was your commute.
|
|
|
|
Post by The Urban Mythbuster on Feb 9, 2015 20:50:34 GMT
Car to Motorcycle: I thought the car to motorcycle was fun to watch. I was amazed at how easily the exterior pieces came off the car, my daughter thought it was funny.  It was nice to see them get back to basics and it appeared that A&J enjoyed just working on the car with nothing more than handtools (though, they probably enjoyed it more when they got abck to the shop with the power tools). I didn't expect it to be driveable, since it had a very off-center center of mass. Some sort of outriggers might have helped to keep it upright, but would it still be a motorcycle? Paddlebike: Nothing surprising in this. I couldn't find any reason why it wouldn't work, with the amount of bouyancy being the only variable. If allowed to, I'm sure Adam would have created something more like Jamie's design, but he was sticking to the design within the video.
|
|
|
|
Post by the light works on Feb 9, 2015 22:00:42 GMT
Car to Motorcycle: I thought the car to motorcycle was fun to watch. I was amazed at how easily the exterior pieces came off the car, my daughter thought it was funny. It was nice to see them get back to basics and it appeared that A&J enjoyed just working on the car with nothing more than handtools (though, they probably enjoyed it more when they got abck to the shop with the power tools). I didn't expect it to be driveable, since it had a very off-center center of mass. Some sort of outriggers might have helped to keep it upright, but would it still be a motorcycle? Paddlebike: Nothing surprising in this. I couldn't find any reason why it wouldn't work, with the amount of bouyancy being the only variable. If allowed to, I'm sure Adam would have created something more like Jamie's design, but he was sticking to the design within the video. I am somewhat in awe of the engineering that went into the 2CV. considering this car started its design phase before WWII, some of the technical details that went into it are mind boggling. I kind of wish the episode had included a reminder of what part got broken (the whole thing allegedly came about because the driver hit a rock and broke something) that would let us know if a tricycle or a travois would be any kind of option. my next technical question is whether the transaxle has a planetary gear differential. if it does, then you could double the drive drum speed by immobilizing the other drive drum. |
|
|
|
Post by OziRiS on Feb 12, 2015 0:07:22 GMT
I kind of wish the episode had included a reminder of what part got broken (the whole thing allegedly came about because the driver hit a rock and broke something) that would let us know if a tricycle or a travois would be any kind of option. I was thinking the same thing. If the wheels hadn't been damaged, but it had "only" been the axle, making a trike or even using both wheels in a kind of training wheel setup might have made it drivable. |
|
|
|
Post by the light works on Feb 12, 2015 2:04:29 GMT
I kind of wish the episode had included a reminder of what part got broken (the whole thing allegedly came about because the driver hit a rock and broke something) that would let us know if a tricycle or a travois would be any kind of option. I was thinking the same thing. If the wheels hadn't been damaged, but it had "only" been the axle, making a trike or even using both wheels in a kind of training wheel setup might have made it drivable. the best I can recall, it broke a front suspension piece. - which would mean he could have possibly turned it into a rear drive trike - but steering might have been problematic. |
|
|
|
Post by c64 on Sept 23, 2015 11:23:32 GMT
The episode where they had converted a 2CV into a motorcycle was recently aired over here in Germany. The conclusion is that it might be controllable if it only would have been faster. There is a way to do that. I am not sure if you need more advanced tools but you can flip the differential over reversing the direction the output shafts turn. A differential looks like this:  The one inside the 2CV is installed inside the gearbox and unlike the one in the rear axle of a car, you can install the part that is revolving "upside down". Also I have noticed that they had disabled the shock absorber. The 2CV doesn't use a conventional shock absorber. Most mechanics not familiar with the 2CV don't even notice that the 2CV even has one. The big cylinder behind the wheels isn't connected to anything but the wheel itself and this is the shock absorber!  The cylinder is filled with thick oil and contains a lump of lead with holes drilled through it. The up and down movement of the wheels make the lump of lead churn oil stealing energy which can cause an oscillation. The Mythbusters had installed it almost horizontally which might seriously interfere with steering and the wheels are now free to oscillate up and down which also prevents a decent handling of the bike. |
|
|
|
Post by the light works on Mar 13, 2016 15:04:01 GMT
however, in a conventional axle, the axle can be reversed - essentially making it "upside down" while it looks like the gearbox of the 2CV has to be opened to flip the gear.
I know my dad's friends used to take a VW beetle transaxle and reverse the rotation to make it mate up with a Corvair engine, but I don't know what tools were required.
my own question would be if it would have been possible to simply raise and immobilize the broken wheel, and counterweight the car in order to make it function as a tricycle.
|
|
|
|
Post by c64 on Mar 13, 2016 15:15:58 GMT
however, in a conventional axle, the axle can be reversed - essentially making it "upside down" while it looks like the gearbox of the 2CV has to be opened to flip the gear. I know my dad's friends used to take a VW beetle transaxle and reverse the rotation to make it mate up with a Corvair engine, but I don't know what tools were required. my own question would be if it would have been possible to simply raise and immobilize the broken wheel, and counterweight the car in order to make it function as a tricycle. If I remember correctly, two whole wheels were destroyed. This can happen easily in a desert when you run over rocks with sharp edges. Then the tire and the rim are destroyed instantly. |
|
|
|
Post by the light works on Mar 13, 2016 15:43:53 GMT
however, in a conventional axle, the axle can be reversed - essentially making it "upside down" while it looks like the gearbox of the 2CV has to be opened to flip the gear. I know my dad's friends used to take a VW beetle transaxle and reverse the rotation to make it mate up with a Corvair engine, but I don't know what tools were required. my own question would be if it would have been possible to simply raise and immobilize the broken wheel, and counterweight the car in order to make it function as a tricycle. If I remember correctly, two whole wheels were destroyed. This can happen easily in a desert when you run over rocks with sharp edges. Then the tire and the rim are destroyed instantly. I thought it was one front wheel and the associated suspension components, from hitting a large rock. |
|
|
|
Post by the light works on Mar 13, 2016 15:53:34 GMT
|
|
|
|
Post by Cybermortis on Mar 13, 2016 21:19:23 GMT
*Moved and merged the five posts above into the existing thread on this episode - CM*
I've looked at this story before, investigating as much as I could. The design they used was the one in the pictures of the actual 'bike' claimed to have been made. I have my doubts about the story, not because of the findings of the show but simply because the first news report on this seem to have appeared several years after it was meant to have occured. It is possible of course that the story was only picked up at this point, having appeared elsewhere at an earlier time. But if so I can't find any evidence of this.
|
|
|
|
Post by silverdragon on Mar 14, 2016 10:03:40 GMT
So I am taking a look at this, and I am wondering....
Why no "Outrider"....
Dont care how damaged a tyre is, the wheel survived, and on a vehicle short on balance, why wasnt there a not weight bearing stabilising extra wheel used as just that, a stabiliser?...
|
|
