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R/C Tech Forums Thread Wiki: Team Associated RC10 B5m Mid-Motor Thread
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Old 03-27-2015, 09:03 PM   #12691
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And it's not like anyone had to pay to watch his video. Cut the dude some slack...especially given that his test is basically valid for what he was testing for.
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Old 03-27-2015, 09:10 PM   #12692
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Or instead of debating the semantics of it, you try the only test that matters. Actually trying it on a racetrack.
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Old 03-27-2015, 09:19 PM   #12693
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Quote:
Originally Posted by raceguy13 View Post
The tires go the same direction with a 3 gear as they do with 4 gear, but the debate is what effect motor rotation has on the cars attitude. It seems that you would need to have the tires off to test for those effects.
Yes that was the whole point of the video.

The tires would only interfere with what the motor's direction effect does on the car. That's indeed why I took them off as they don't change direction.

I did try before to put the car in a way to show the action/shocks but nothing happens at all. The effect is too small to be perceived.
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Old 03-27-2015, 09:43 PM   #12694
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Originally Posted by shannow View Post
I posted a video on another post debating mm3 vs mm4 but it didn't seem to catch on.
This is what I wrote if it can be of any interest to somebody here as it was done on my b5m:

"I'd say it's negligible.(about mm3 vs mm4)
Sorry I just did this video for your question. The quality is crap and it's loud (turn the volume down a bit for the squeal of the motor):
https://www.youtube.com/watch?v=DATXwtVJoSY
The car is on water not touching anything else. The test speaks for itself.
I tried several axis. I can feel resistance (very light) on the vertical axis with no rotation direction preference but pretty much none one the other two.
Certainly no movements on it's own. So changing direction shouldn't make any odds or to me at least it's negligible.

I'm open to any theory/counter theory as I once contemplated the idea too."
That video is epic.

Pure epic. It's worth what we all paid, that's for sure.

Great idea, the execution, isn't scientific at all. I would recommend reading what the scientific method is, and learning more about it.

Then sit down and learn the equations of inertia and newton's law. Do the calculation based on weight and rpm of the motor and drivetrain, then balance those numbers against the same equation for the axles, wheels inserts and tires. Don't forget the different radius the items have, and also figure that in with specific weights.
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Old 03-27-2015, 11:00 PM   #12695
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It's not the tires spinning really.. its the torque of the motor going AGAINST the weight of the mass of the drivetrain that torques the car in the opposite direction.

lets move on to the B5m.
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Old 03-28-2015, 12:26 AM   #12696
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Quote:
Originally Posted by raceguy13 View Post
The tires go the same direction with a 3 gear as they do with 4 gear, but the debate is what effect motor rotation has on the cars attitude. It seems that you would need to have the tires off to test for those effects.
This is correct. I haven't even watched the video but the tires have nothing to do with forces being different between the 3 and 4 gear transmissions.

If you're running 4 gear and want to lift the nose you hit the throttle, right?

If you're running 3 gear and want to lift the nose you still hit the throttle, right?

That means the tires would have to be off to isolate any differences in movement of the chassis between the two transmission types.
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Old 03-28-2015, 12:30 AM   #12697
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Originally Posted by Socket View Post
That video is epic.

Pure epic. It's worth what we all paid, that's for sure.

Great idea, the execution, isn't scientific at all. I would recommend reading what the scientific method is, and learning more about it.

Then sit down and learn the equations of inertia and newton's law. Do the calculation based on weight and rpm of the motor and drivetrain, then balance those numbers against the same equation for the axles, wheels inserts and tires. Don't forget the different radius the items have, and also figure that in with specific weights.
Perhaps you could use your scientific method to calculate why the stock B5M motor location is wrong, according to you.
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Old 03-28-2015, 05:22 AM   #12698
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Old 03-28-2015, 05:40 AM   #12699
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The same test with the car sitting on a set of scales would probably be a much more accurate representation of what is happening with a 3 or 4 gear transmission.

You're welcome.
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Old 03-28-2015, 06:20 AM   #12700
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Perhaps you could use your scientific method to calculate why the stock B5M motor location is wrong, according to you.
So I never said anything was wrong. I did however say the mip does move the motor when compared to the AE 4 gear.

As for using the scientific method on it, I already have. I setup all three chassis I have on hand, and measured each one for motor placement. I then ran two back to back to feel the effects. I also used scales to see if the weight bias changed Between the three transmissions back to back.
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Old 03-28-2015, 07:06 AM   #12701
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You want a sub-forum for B5m plastics discussion?
Haha no. A sub forum where you could ask random questions referring to the B5m and not get directed to a 12,000+ post thread.
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Old 03-28-2015, 07:06 AM   #12702
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Originally Posted by Socket View Post
feel the effects.
Ohhh, now thats quantifiable and objective.
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Old 03-28-2015, 07:10 AM   #12703
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Ohhh, now thats quantifiable and objective.
Hey good job on cutting every portion of my post that is factual out, and leaving the part with human error to make a comment on.
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Old 03-28-2015, 07:54 AM   #12704
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Not much about engineering is factual in the end product. If it was they would have engineered the perfect car a long time ago and we could stop buying new ones over and over trying to find perfection.

Just sayin'
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Old 03-28-2015, 08:06 AM   #12705
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Quote:
Originally Posted by Socket View Post
So I never said anything was wrong. I did however say the mip does move the motor when compared to the AE 4 gear.

As for using the scientific method on it, I already have. I setup all three chassis I have on hand, and measured each one for motor placement. I then ran two back to back to feel the effects. I also used scales to see if the weight bias changed Between the three transmissions back to back.
I almost edited my post last night to say "use your knowledge of physics and math to calculate" but I think the point was made.

I'm curious how old you are and what grade you're in. Have you had an actual physics class yet?

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