LMX P2 : Freeride trials motorcycle frame development

Drum said:
Hi Adam,
A question about the torque of this motor from a standstill.
Skeetab is having trouble accelerating from stopped.. hopefully he can get that sorted.

You said yours "pulls like a train from 5 - 50 kph".
How is it with the Kelly controller pulling away from stopped and below 5kph? Could it pull away uphill on a steep hill?

With no pedals to help get you moving, this is quite important!

I know that with the programmable controller there are many settings that can be adjusted that might affect this (just re-read Crossbreak's comparison of controllers on the "Kelly controller" thread, and some of the other comments.. obviously there is a lot to learn about these controllers).

Thanks,
Dave
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At the moment there is the kelly delay that does weird things below 5kmh but i'mm pretty sure it will work once I manage to eprogram it. Damm rs232 dongle pilots & win8.1
 
Try to get an rs232 dongle with chipset from FTDI. Was working plug n play on a colleagues win8 machine.
 
bzhwindtalker said:
I am thinking about the bike frame color... I was going with matte black but matte orange would look quite cool too. what do you guys think?
Click to expand...
Hey either of those sound good, or maybe both.

What about both of them, with a Thruxton style stripe.
http://procycles.com.au/main/wp-content/uploads/2011/09/2011-Triumph-Thruxton1.jpg
 
bzhwindtalker said:
Still no news from the batteries... I want to ride damm!
Click to expand...

could take a month...looking @ the link I see that the 10Ah cells are almost square and so looks like the KOKAM ones used in the quantya, and BRAMMO, ...so : motorcycle batteries...it looks likes it's going to democratise ...@least if the customs don't block every cells...hobby King can't ship up to 5Mah @ may place right now...they got all their order inspected...seems like the time of cheap energy from china by airmail ...is done... :(
 
yeah that is really sad :(

The Kelly is really useless without programming it. Throttle lags sucks so much that i didn't even try. I do programming with an old Laptop from 2004 (Pentium4, Windows XP home) i got for free years ago. Works really straight forward.
 
@crossbreaks...I'm yet to plug my Kelly in and program it, things nuts straight out of the box, I guess it depends on the model and firmware installed, I did get the benefit of customised firmware coded specifically for my modified motor, not what you know tiz who you know sometimes teehehe...

KiM
 
Mr Sweden, I am still testing the frame and making plans for a first production batch. PM me for details ;)

AJ, my kelly has this horrible ramp up/ramp down thing from the box and I've not yet managed to communicate on my win 8 laptop I tested all the drivers it's really a problem with prolific chips and win 8 :/
I could bring my bike in the flat and use the desktop but I don't have my new batt anyway ! :| I will borrow the converter we have at work I think next week.


From the limited peg time I had on this bike, I feel like I can achieve a lot with his bike !!

[youtube]sX1G7DdbZYM[/youtube]
 
good job!

how long do you think you can climb 20% grade before something melts (with your gear ratio)?
 
how cool is that?! I just wanted to ask where you got the rectangle tubes... i searched the whole net but found nothing out of chromo.

Now i am thinking again about 4 linkers since they need no rectangle tubes :mrgreen: Anyway, i am not an expert for welding.. any idea which wire i use for S355 (sheets) and chromo? Guess it will be the same as for S235 and chromo?
 
He said the box section (rectangle tube) is the only part that is not 4130. If you are not going to heat treat the frame it is best to use ER70-S2 or ER80-SD2 filler rod. If you are going to heat treat then I'd consider using 4130 filler but still not 100% necessary.

Not sure if they ship international but these guys have a few different sizes of rect tubing that might work for you crossbreak. I have bought from these folks in the past. Here is their Euro site.
http://www.aircraftspruce.eu/metals---plastics/steel/4130-square-tubing/4130-airframe-square---rectangular-tubing-mil-t-6736-normalized.html

http://www.mcmaster.com/ has it also but I am pretty sure they don't ship international.
 
There is very little point in getting too deeply into material composition unless you are going to do stress analysis based on real world forces gathered from data logging and design to have the least possible mass of your material for the desired purpose. if you are just going to make a box section swingarm using the that looks strong enough it will never bend approach based on experience and judgement from having seen hundreds of different ones during your life then I would imagine mild steel would suffice like Adam has done here.
I have built many things, bicycle frames, motorcycle frames, car chassis etc using this approach. you develop the skills to know what is enough for the job. With proper design far less may be sufficient but there is no point getting technical in material choice if you don't know what is required.
 
Not to mention that it seems he has the skills and environment to whip up a new one at any point.
I'd be more concerned with materials if I was buying a bike than I would be if I had the ability to fab my own.
 
stiffneess of chromo and mild steel is the same for sure. And i want it to be stiff anyway so i think more about mild steel, which seems to be perfect for a prototype. Still i do some stress analysis at certain points like suspension linkage and headtube. When using a structure work, most of the tubes and links can only collapse if they cripple or the weld breaks. A CAD program specially made for such structures would be nice, 2-D would be sufficient.
 
crossbreak said:
stiffneess of chromo and mild steel is the same for sure. And i want it to be stiff anyway so i think more about mild steel, which seems to be perfect for a prototype. Still i do some stress analysis at certain points like suspension linkage and headtube. When using a structure work, most of the tubes and links can only collapse if they cripple or the weld breaks. A CAD program specially made for such structures would be nice, 2-D would be sufficient.
Click to expand...
I recently helped my son fit a bigger intercooler on his car, he hung this from the reinforcing beam behind the front bumper, at first glance this looked like any other sheet metal pressing but drilling it was a different matter, I have a set of quality cobalt drills that are sharpened professionally in a machine with diamond faced cutters, they look beautiful! but they would not touch this cromo steel, so I disagree that cromo and mild steel are similar in their properties!

When seat belt laws where introduced for public transport in the UK I was working for a coach building company, I designed a seating system for buses with integral seat belts mounted into the seats that could withstand the seat belt loads. All told I spent months testing designs at MIRA and Millbrook (motor industry research association) I smashed a lot of vehicle bodies! Anyway, I then jigged up and put this seating system into production and managed the shop for another 10 years or so. I have built a huge amount of structures out of box section and round steel tube. You get a good idea of the material section and wall required for a job. What Adam has done here all looks good to me. I am sure his design would be ok made entirely in mild steel, the strength is in the design not the material, except the swingarm, which has a greater bending force which is the reason for the larger section box.
Good design transfers as much force as possible into tension or compression rather than bending, greatly reducing the need for large cross section tubing.
 
this is a thing of beauty. congrats!

a lot of questions:

how much does it weigh now?

what does LMX stand for? and while i'm at it, what does bzh in your name stand for. i have the hardest time searching for your stuff cause i always type brz or bhz...

what motorcycle was the seat subframe from?

why the pedals? why not footpegs?

got a link for this big block motor? is it stock or has it been rewound?
 
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