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Slot car magnet experiment – Slot Car Illustrated Forum
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World Champion
- Join Date: Oct 2004
- Posts: 16351
Who has one of these:
And one of these:
I am trying to determine if the Mega-G has a high downforce or high horsepower setting, and what the setting is from the factory (if there even is a default).
Last edited by NicoRosberg.; 09-16-2011, 01:58 PM.
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Championship Contender
- Join Date: Oct 2006
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If the traction magnets on each side read opposite of the motor magnet bottoms on the same side. It is high downforce. If they are the same they are in low downforce.
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World Champion
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Thanks Bob, that is the conclusion we are getting to here as well. As the motor magnets in the MG17 are handed, that is one less variable.
I don’t have any chassis set from the factory, but I think if I recall correctly one traction mamagnet matches the motor magnet on the same side and one repels, which is a neutral setting?
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World Champion
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Interestingly, this explanation from a well known racer website seems to disagree with Bob:
The theory is that installing like-pole motor and traction magnet on each side of the car produces High Downforce. Swapping the traction magnets so they are the opposite polarity of the motor magnets creates Low Downforce or Motor Mode. The Motor Mode setup allows the traction magnets to push a magnetic field into the motor box thus acting on the armature.
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Championship Contender
- Join Date: Nov 2010
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Gentlemen, this is the first time I have ever read anything on this particular topic before; the only thing I have ever seen is about swapping stronger magnets, or lowering the chassis for more magnetic downforce. I admit this concept has never crossed my mind before. Please share more of your thoughts on this technique.
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Top Qualifier
- Join Date: Jun 2007
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Hoppy:
The hi/Low magnet technique has been around for years. The concept works well in determining how you set up your chassis for a particular track. Some tracks like Max Traxx and Buck Track rail size created a very strong attraction, to compesate racers would set their cars up in the low downforce setup (whereas the taction magnets are the same polarity as the motor magnets) basically creating a bar magnet that has one side north and one side south.
For tracks that the rails create a low downforce (Victory lanes, Tomy, TKO) you set the cars up in the high downforce position whereas the traction magnets and the motor magnets are oposite polarity basically creating two separate bar magnets (North and south) on each side of the car thus creating more downforce.
When using this technique you also need to adjust your tire heights to compensate for the magnetic force that is generated by your setup…in other words..HDF..if your car is too low it will overheat and become a BBQ on the track..LDF..if your too high..your car becomes very loose and won’t stay on the track…are you following me………
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Championship Contender
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Magnet Experiment / Polarity/ Location
JLM, I have read your post, and I will find time to experiment, as my track is a four lane Tomy. If this was out on the Forum previously, I either just missed it, or it went completely over my head. Thanks for taking the time to lay it out for me, as well as others who may not have been familiar with this technique.
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Top Qualifier
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World Champion
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So Bob and Yobear say one thing, the quote I found says the exact opposite.
Does anyone have the two items in post 1, and a Mega-G with magnets still factory set?
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Championship Contender
- Join Date: Oct 2008
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4 x factory Mega-Gs (2xLWB, 2xSWB) checked and it’s like this (imagine the motor mag set-up as one big magnet across the chassis – with a pole at each end):
Remember, a long time ago (2008?) I discovered this set up wouldn’t trip the AFX electronic lap counter reed switches, and I discovered I needed to flip one of the magnets. I posted it all here somewhere.
Here are the two options (green=south, red=north):
This can be done with any chassis where the traction mags can be swapped round in this way – or with ‘reverse-zapping’ ceramic magnets like in a 440×2.
Last edited by woodcote; 09-18-2011, 06:00 AM.
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World Champion
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Andy,
Does the motor magnet act the same way on the surface facing down to the track as in your diagram (facing outwards)?
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Championship Contender
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I’m not sure what you’re asking Deane, but I’ll try and answer.
The poles lie horizontally with the motor mags and vertically with the traction mags (as per the arrows in the diagrams).
The motor mags will exert magnetic ‘grip’ toward a metal object sitting at 90 degrees to the motor mags poles (ie the rails), but not to another magnet showing its north or south pole from above or below.
If you did do this, a north-faced magnet will not be attracted/repelled in an up or down direction, but will be pushed from left to right when applied to the bottom of the motor mags.
So offer it to the left motor mag and it is pushed into the armature-well. Offer it to the right mag and it is pushed to the outside of the chassis.
A south-faced magnet will be pushed the other direction.
Ultimately the magnetic field created by each set-up is more than the sum of its parts. It’s not just south + north + south = XYZ. The twists and turns of the different magnetic fields created by each set-ups gives a different degree of magnetic attraction on the rails and on the armature.
Last edited by woodcote; 09-18-2011, 05:58 AM.
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Championship Contender
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Bob and Woodcote are right in the way they explain the field.
Take the bottom of the traction and place it against the side of the motor. If it attracts place the magnet down toward the track on that side of the motor. Do the same for the other side. This is high downforce. For low down force you would place it on the oposite corner.For a stock motor with stock magnets, you always want high down force. Doesn’t matter what track your using.
Only when you have heat build up you would look in other ways to set up motor traction field.
This is an option if all else has failed in reducing heat.Last edited by Eric Peterson; 09-18-2011, 08:04 AM.
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Championship Contender
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I just want add. On down force, this is how it works for Storms, Gs and Thunder Cats.
How you should set up a Mega I know nothing of what works best.
I wonder why they come set up with both tractions in the same direction. I dought I will ever take the time to find out.Comment
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Championship Contender
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I will ask John Cukras this week how the set-up in the mega g came about and post his answer here if its ok with him.
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