I don't think he is kidding, and I am sure he is not the only one who feels that way.
I get the feeling this thread was written with you in mind: viewtopic.php?f=54&t=69084
Feel free to disregard the advice from members on here who have experience of what works and what does not, and what is safe and what is not, but it is on your head when it fails, and you crash and you and the poor old lady crossing the road that you hit, both end up in wheelchairs for the rest of your lives... Imagine this, you are in a wheelchair and the family of the woman is taking you to court for building and riding an unsafe vehicle, not only that, the police are after you for the same reason and you will probably spend time in jail.
This is not a game! The motors you are talking about using are more powerful than some real motorbike engines, have you ever looked at the frame and suspension on a small motorbike? They are made of far thicker tubing than a standard bike and you will notice bars are not just welded to each other like a butt weld, they spread out and over lap so that the forces acting on the welds are in shear, they spend years getting it right to work with the lightest frames they can, a single builder can not devote that much time and money to a design, so it is always better to err on the side of safety and use stronger tubing, and well thought out joining methods. (If you do not understand what designing a joint with the welds in shear means, then you do not have the knowledge to build a bike with the motors you are intending on using.) Also on rake and trail, it is apparent that you do not understand the forces at work, without a decent knowledge of how it all works you would be better converting a second hand motorbike front to work with your frame, just remember to mount them on the same angle as they were on the motorbike!
Unfortunatly it does not appear you have the skills or equipment to build a bike with this kind of horsepower and capable of this much speed, that is why it is constantly suggested to you to use a smaller chinese kit motor, they are designed to work with a standard bike and are still capable of going fairly fast, without overstressing a standard bicycle frame...
Not trying to discourage you, just trying to stop you from building something dangerously unsafe. :wink:
Luke.
I get the feeling this thread was written with you in mind: viewtopic.php?f=54&t=69084
Feel free to disregard the advice from members on here who have experience of what works and what does not, and what is safe and what is not, but it is on your head when it fails, and you crash and you and the poor old lady crossing the road that you hit, both end up in wheelchairs for the rest of your lives... Imagine this, you are in a wheelchair and the family of the woman is taking you to court for building and riding an unsafe vehicle, not only that, the police are after you for the same reason and you will probably spend time in jail.
This is not a game! The motors you are talking about using are more powerful than some real motorbike engines, have you ever looked at the frame and suspension on a small motorbike? They are made of far thicker tubing than a standard bike and you will notice bars are not just welded to each other like a butt weld, they spread out and over lap so that the forces acting on the welds are in shear, they spend years getting it right to work with the lightest frames they can, a single builder can not devote that much time and money to a design, so it is always better to err on the side of safety and use stronger tubing, and well thought out joining methods. (If you do not understand what designing a joint with the welds in shear means, then you do not have the knowledge to build a bike with the motors you are intending on using.) Also on rake and trail, it is apparent that you do not understand the forces at work, without a decent knowledge of how it all works you would be better converting a second hand motorbike front to work with your frame, just remember to mount them on the same angle as they were on the motorbike!
Unfortunatly it does not appear you have the skills or equipment to build a bike with this kind of horsepower and capable of this much speed, that is why it is constantly suggested to you to use a smaller chinese kit motor, they are designed to work with a standard bike and are still capable of going fairly fast, without overstressing a standard bicycle frame...
Not trying to discourage you, just trying to stop you from building something dangerously unsafe. :wink:
Luke.
