New freeride project - LMX P1

[bzhwindtalker]

Some pictures of my bike

 

[bzhwindtalker]

 

[bzhwindtalker]

 

[bzhwindtalker]

 

[bzhwindtalker]

 

[crossbreak]

Crossbreak do you have the tools to truly test this motor?

I have a MagicPie2 hubmotor as a brake for a test bench, using 3 bridge rectifiers and some MosFets for brake power control through PWM; 24x 50W halogen bulbs for power dissipation. An Arduino switches the FETs and is controlled through LabView which also controlls the throttle of the test bike. Yet I cannot dyno a bike on it directly, have to develop it further to make it a roller test bench. It needs a digital scale to measure torque, i use the MagicPie2's Hall sensors for speed measurement. All half baked ATM.

 

[bzhwindtalker]

Thinking about a new swingarm watercut from 10mm aluminium sheet...

 

[Denisesewa]

Thinking about a new swingarm watercut from 10mm aluminium sheet...

Oh Boy !! that looks awesome !!
If that works out how cool would it be to build the frame the same way ?

 

[jansevr]

very nice, looks good. any specific reason you want a new swingarm? slightly different geometry? any problems with the old one or do you just want a new look?

 

[John Bozi]

How much would it cost to get that done?

 

[bzhwindtalker]

I'm not sure yet but we have a water cutting machine at shool, I'm sending the files out for evaluation when I'll be happy with the design. I am working on this design for astetics and weigth reduction, the current swingarm is OK but I'm not pleased about it mechanicaly. I'm not too sure about a full frame done this way, especially at the head tube assembly. Most trial frames keep the head tube zone chromo so maybe aluminium would stress crack? I bet one could desing a watercut kit frame that would save a lot on shipping (ikea style)

Adam

 

[jansevr]

i designed a frame a while ago that was designed to be water cut (i'm not sure about aluminum either...steel would definitely work but might be heavy depending on the thickness). there have been some modifications to the design since the render, but this is the latest one i have access too now (all the files are on my laptop which i don't currently have). after seeing your frame however, i want to possibly further modify the design so that the hubmonster can be used as a mid drive at the pivot. this project is still most likely a long ways down the road (unfortunately i don't currently have the funds necessary for a project of this scale) .

here's the design thread that shows my thought process and different iterations that led me to the design above:

http://endless-sphere.com/forums/viewtopic.php?f=3&t=48380

 

[bzhwindtalker]

I changed the chain setup to #35 that should give me a lot of relyability! I did a first test ride and all went perfect, I incrased the reduction ratio and the motor likes it a lot, I get mutch more torque and the top speed isn't bad (about 50kph) The 80% of chain noise is gone, and I feel like unlimited wheelies are possible again. I got my parts from straton-inc but paid so much for shipping, I ended up paying about 70€ for the full setup, but from my firts test it is really worth it!

I had to machine the motor to accept the 24t driving sprocket, I started out with the grinder but as it was not working out so I did what I do the best, improvisation

I took a super basic kitchen knife and used the steel handle to carve a "lathe" tool. Then I used the frame as a rest point for it, and got the motor spinning. I managed to get a really nice fit and finish, removing quite a bit of aluminium! I would not have made mutch better in a reall lathe and it would have been much longer! Sorry I could not video tape the process haha but I have some bad pictures :

 

[Whiplash]

Lol! Not bad where there's a will there's a WAY! GLAD ITS WORKING OUT FOR YOU!

 

[bzhwindtalker]

We took some great jump pictures with a friend, I will post them as soon as he gets them developped!
Here is what the bike looks like ATM :

 

[bzhwindtalker]

Broke the swingarm on a jump... The failure went quite well, no other damage to myself or the bike but I have quite a bit of work to get it all back working. Time to crank up the LMX P2 project I guess!

 

[Whiplash]

Oh no! Where'd it break??

 

[bzhwindtalker]

At the base of the shock mount, the two upper arms broke too. I kinda knew it would happen, I was not pleased by how it looked, and I usually have a good eye for this kind of things... I was lucky that it failed on grass. Pictures to come (including the jump before the fail)

 

[bzhwindtalker]

This is where it failed, and what I should have done. I will weld this one back and add those support bars to the front, then build a new swingarm before jumping too much again

 

[christerljung]

Nice to hear nothings broken more than the swingarm.
Maybe machine and weld a new one in aluminium?

 

[speedmd]

Hi bzhwindtalker

Like watching your video posts. When you remake the swing, I would also not punch the holes through the main swing box legs for the cross brace. Better to butt weld a section of rectangular tubing there as a cross brace leaving the full amount of material in the main swing legs. Shock attachment and pivot points, I would also make a bit sturdier. I have seen you ride. :lol: Best wishes.

 

[bzhwindtalker]

Nice pictures from before the failure!

 

[dan974]

hehe you just need to extend your legs to become the flying frogy :lol: niceshoots, I'd like to see you find an MX track and jump that bumps too

 

[benmxrider]

vive La Doua :lol:

 

[charleyhaze]

Maddest!