# My Lectra project

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### Re: My Lectra project

WOW!

What an interesting project!
Not only is the frame a rarity but the cowling will make it extremely unique.
Quite the battery pack and one heck of a motor ...
... This is going to be one smooth sailin' streamlined motorcycle.
I know you've done the math, what do you expect to see for top speed.
Should have very good range at 30-35 mph.
I saw that AllTrax controller, I'm guessing that was an excellent choice, is that an AXE?
I couldn't get to the spec page at EVPart's but it looks like you'll be running that motor at a pretty high RPM.
I'm assuming you have a belt drive reduction of some sort, I'm wondering what RPM will be most efficient and do you have any options for changing that reduction?

Well, it sounds like you're almost there, good luck on the maiden voyage, hang on :)

Yes, we need some pics when you get time ... Pleeeeze!

Dave B

### Re: My Lectra project

I know you've done the math, what do you expect to see for top speed. Actually I haven't done the math, and I don't quite know how to do so. I recall the RPM of the rear wheel is what determines speed, based on the circumference of the rear wheel. And that the chain reduces motor RPM to wheel RPM based on the ratio ... (it's a chain drive, not belt drive). Changing the reduction should be a matter of swapping the sprocket on the motor. On the other hand Lawrence set up the gear ratio and I suppose he already did the work to figure this out. He was, though, using a different voltage and controller.

The controller is an AXE.

### Re: My Lectra project

I'm not sure there are really many similarities other than the basic physics but I was under the impression (based on Eric Peltzer's work) that a chain tends to make a great deal of noise above 750-1000 RPM.

I suppose this is about where the similarities end though, you are using a motor from, what, 6-21 hp, a much heavier chain, probably a larger motor sprocket etc. Each of which changes the dynamics quite a bit. (From a 1hp motor w/ #35 chain).
Sorry, I don't know much about how electric motorcycles are normally set up. I sure am sold on the quietness and low friction of the synchronous belt but I'm curious how the chain running directly to the wheel sprocket works out re. noise. Then again, you don't necessarily need to be that stealthy.

Have you ever tried an AXE controller? It's really nice to be able to fine tune it's attributes via computer.
Once everything is set up it's not anything you'll ever use again but it sure is nice to get it just right.
Funny thing is, I tweaked my settings on my bike, went back and forth with a few then ended up setting every thing back to default and it was perfect ... haha.

The ratio thing will just be trial and error, when you hit the right one ... you'll know immediately.
My bet is that it will work just fine the way he had it set up unless you've really changed the mass and/ or motor torque a great deal. You can tweak the controller so that should make life easier.

Have Fun,

### Re: My Lectra project

Have you ever tried an AXE controller? It's really nice to be able to fine tune it's attributes via computer.

No, I've not tried one of them.. except one time I got to ride one of Craig's scooters (it had an alltrax). I do know about going in to the controller and setting the parameters etc.. but the software for that only runs on Windoze and I use either Linux or Mac (no Windoze). I do have the Parallels PC emulator on my Mac, and I do have a copy of WinXP installed in that, and hopefully that combo can talk to the Alltrax. Unfortunately when I tried a couple months ago it didn't work.

The main reason to have this controller is it supports 60 volt. There's a wide range of choices for 48 volt controllers, but I want to run this bike at 60 and that limits the controller choices.

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