Electric dragster help ! (2 Viewers)

[Okbang]

Update:

Reglued the front axles like 5 times, finally got it to go straight !

Trimmed off some weight to make the body narrower, someone tell me if a narrower car is more suitable for drag racing?

Reglued some wheels as they were starting to fall off.

But! One problem still remains...when i push the car normally (when its off) in a direction it will travel in a straight line (good). But when i turn it on and leave it to move on its own, it tends to move off to the left ? btw the motor delivers power to the right rear wheel which is connected to the left rear wheel via an axle, if that helps.

 

[ClockworkSoldier]

Update:

Reglued the front axles like 5 times, finally got it to go straight !

Trimmed off some weight to make the body narrower, someone tell me if a narrower car is more suitable for drag racing?

Reglued some wheels as they were starting to fall off.

But! One problem still remains...when i push the car normally (when its off) in a direction it will travel in a straight line (good). But when i turn it on and leave it to move on its own, it tends to move off to the left ? btw the motor delivers power to the right rear wheel which is connected to the left rear wheel via an axle, if that helps.

Yes, a thinner body allows it to 'cut' through the air with less resistance. Also, the lower and flatter you can get it, the better.

Power delivered to the right wheel will cause it to torque steer left. You can counter this with a differential to get both wheels spinning and delivering power (if you get ingenious with your smaller gears), or adjust the front axle to counter-steer (it may begin to steer right as the car reaches top speed though).

 

[Okbang]

Yes, a thinner body allows it to 'cut' through the air with less resistance. Also, the lower and flatter you can get it, the better.

Power delivered to the right wheel will cause it to torque steer left. You can counter this with a differential to get both wheels spinning and delivering power (if you get ingenious with your smaller gears), or adjust the front axle to counter-steer (it may begin to steer right as the car reaches top speed though).

Haha thanks, I've made it thinner but because I've glued/soldered most of my parts already i can't do any more than that. Oh well.

I tried the counter-steering thing today, it worked to some extent - it still yaws to the left but it's only barely noticeable. Explain the differential in terms of how to apply it with small plastic gears?

Here's a picture of progress



- Added rubber bands to the rear wheels to improve grip (the wheels + tyres are actually made of plastic)
- Changed the front (again, plastic) tyres to a rubbery set.

It's really fast atm but it presents another problem...the gears can't really take the power lol, tried them out today and the gears started shredding themselves off literally. Anybody know how to make them last longer or at least run smoother?

 

[eshay lad 69]

Haha thanks, I've made it thinner but because I've glued/soldered most of my parts already i can't do any more than that. Oh well.

I tried the counter-steering thing today, it worked to some extent - it still yaws to the left but it's only barely noticeable. Explain the differential in terms of how to apply it with small plastic gears?

Here's a picture of progress

View attachment 26186

- Added rubber bands to the rear wheels to improve grip (the wheels + tyres are actually made of plastic)
- Changed the front (again, plastic) tyres to a rubbery set.

It's really fast atm but it presents another problem...the gears can't really take the power lol, tried them out today and the gears started shredding themselves off literally. Anybody know how to make them last longer or at least run smoother?

make the gears mesh better and lube them up

 

[Okbang]

make the gears mesh better and lube them up

where exactly and how much of it?

 

[ClockworkSoldier]

A quick squirt of WD40 would do it. Or a dab of grease?

 

[ClockworkSoldier]

Also, instead of a diff, can you run it with a fixed rear axle?

 

[Okbang]

Also, instead of a diff, can you run it with a fixed rear axle?

You may or not be able to see from the photo in the previous post but currently, both axles are fixed.

Thanks for your help guys, its doing remarkably well. I dabbed some oil/grease directly onto the gears so that they are barely coated. Don't know if it's gonna help durability wise, but it does sound a bit smoother.