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New Test Rig. Testing Past 10ms

2928 Views 53 Replies 8 Participants Last post by  Ade
Test Rig currently being built to test up to 15m/s across all id, no it won't be a rug racing affair but purpose built

As we know Scorpius already tested at 10m/s and passed with flying colours
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Scorpius has track hardware at a recommended 3mm below track surface where SSD is 6 to 7mm below.
A difference of 3 to 4 mm.
We know doubling the distance with light quarters it's power.
Too close the window of opportunity is shortened. Too far the LED loses brightness.
Scorpius allows the the height of both emmiter and sensor to be played with to gain optimum performance.
Tests prove this theory with 10,000 out of 10,000 laps on Scorpius ID 24 at 10m/s speed.
So I can see Ade has a point in that the SSD transistor can never be less than 6mm from
the track surface. And of course a trap for dust. Does it still work? Yes. Is it as efficient as say Scorpius whos hardware and firmware was developed specifically for high competition use? We know it isn't.

So a few ideas as to why distance does matter
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Hi Guys
Currently making a custom made test rig for testing Scorpius, SSD and Carrera lapcounting and lane changing.
It needs to be deadly accurate so Ive had to pull on all my joinery skills and give the Makita tools a good workout.
The loop is constructed using the lamination technique building up layers 3mm at a time.

The car is a 1/24 Metal chassis Group 7 car. No lid.
Foam tyres, 55k rpm Parma Super 16D motor.
Just adding paint and copper tape to complete.
Testing transparency is of utmost importance here.

Should be a fun project to test all the new products in the pipeline for 2021.
Last pic shows first top coat on.
More soon on this.



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Hi Riko,
Centrifugal force holds it in the slot nicely. But yes a 200g steel projectile at 15-20m/s smack into the temple would certainly be a concern.
Top speed? I really have no clue. Let's say 15m/s ti be conservative and go from there.

Fact is digital is limited by nature of the lane changers.
Not sure if people actually think of those important issues
Getting really close now. Copper tape in place.
Just need a few dabs of solder, a power supply, a 50A Scorpius WAM, dongle, software and Scorpius controller and off we go.
This project is turning out to be a lot of fun as I get to use other hobby skills like joinery etc.


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There is no ultimate guide.
Ive found 6mm LED to Phototransistor works well.
Thats 3mm below track and 3mm above track
Or 4mm below and 2mm above
5 mm below and 1mm above. Etc
Then we have trucks where the chassis is 5mm or more above the track.
You get the idea.

Hi Guys,
So I managed to get the loop up and running with the Group 7 chassis and motor set up.
Previous best using a previous loop was 10m/s

Here the 6A power supply wasnt enough so out with the 30A lab supply.
Most I can get out of this supply is 16V so 16V it is.

Using a 30 second timer I count how many laps.
Knowing the diameter is 1810 we can deduce that 66 laps in 30 sec equates to 12.61 m/s
Or 45.396km/h
I realise now the faster you go the more centrifugal force, which in turn is essentially down force.
And the motor was starting to smell so yeah it was working hard.

I think though 12.5m/S is a good enough test speed seeing most digital cars never see half this speed.

Should I make a drag strip? Hmmmm

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To put it another way, in laymen's language: if my maths are correct,12.5m/s equates to about 27.96mph ... which is actually faster than the average speed you clocked on that lap you did at Mt Panorama in the 1:1 Mustang last year :D
The embarrassing bit is I think you may be right.
So to all you maths geeks at which point exactly do I place the speed detector to get maximum speed???
I thought this thread was about sharing ideas and progress to establish a method for testing slot cars at speeds in the range 10-15m/s. Assuming the plan is to reach the upper end of that range I.e.15m/s then some collective ideas and knowledge sharing may help? right?

We all like slot car bones to chew over... especially those that are race speed related...

Just sharing some ideas here😊

All considered years ago. But the reality is theres many many types of slot racing.
Even on a 5m straight in a 33m track at 16V with a standard NSR or the SSD XLC lane changer would deslot the car. And from memory that was around 5.5/S approx. maybe more.
Im guessing Ninco XLC is good for 4m/s before deslot and Im guessing Carrera is around same as SSD.

And we discovered slowing up to negotiate an LC is not acceptable as the driver you are trying to overtake is suddenly 2 metres ahead of you.

We learnt a long time ago Digital employs more realistic speeds. And theres a strategy.
So speed was never a barrier or issue and remains so.

Same with AFX. They go so quick you can hardly see them. Lane Changing really doesnt suit it at all.
Nor winged cars, Group 7 upwards etc.
This is the reality

So as fun as it might be to test something that no one will get to see it work and appreciate is just that, fun.

The reason I prefer a loop ( I thought of using a simple electric fan I have here, metal too) is that you are testing in the environment its meant for.
Ie vibration, track resistance, gear resistance, heat resistance, motor EMF, sparks in rails etc. All huge important factors.
This way you can test multiple things in one time frame. And give a more real world result.

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Dont forget you need stopping room. So a 6 m straight gives you 4.8m of acceleration
As I said with a 25K Non mag on 16V minimum on a 6 m straight I think we were getting 6.5m/s
9.5 is a big mark up from 6.5. But 9.5 is a goal.

Dont forget you dont need a bigger motor if turning up the voltage gives the same effect.

Of course you can go bigger motor and more volts.
The older Scaley chips would burn out exactly on 30V.
So they can take a pounding. Of course load is a factor and must be taken into consideration, ie magnets? How many?

Oh sorry I thought the straight was part of a track.
All good carry on.
Yeah pillows are mandatory.

when I said <and back down to zero> I meant back to 0m/s I.e. stationery I.e. hard braking to reach a stop. All in slightly less than 6 metres! But next I will be trying 12 metres so max speed will be higher than 9.5m/s for sure.

By comparison an out of the box Scalextric McLaren MP4 with digital decoder can reach 7m/s and then stop in the same distance. And this is with its standard FF slimline motor and standard running gear... no trueing... nothing. Surely our carefully optimised cars can get 50% faster over the same distance?

Ill build the same car at my end to yours and Ill build a 12m dragstrip. My mate has the NSR distribution now here in Oz so I can source F1s easily enough.
Or is a Scalextric McClaren the go?
Ill also use my Group 7 as comparison.
Should be fun
Touchy as I used to work there and so many people make the C mistake:

McClaren => McLaren

Mc or Mac is the Gaelic form of "son of". So son of Laren or in English we would have said Larenson or similar.

No capital C in McLaren.
Thats why I drive a Ford, easier to spell and more reliable &#128522;
Too many scary warranty claim videos on YouTube for McLaren.&#128522;
What I like about is I can put it in test mode and go and make lunch. It has a ding sound every lap that I can hear plus everything gets recorded to excel for a visual check.
I can test 10,000 laps in 83 min or thereabouts.
It saves around 90% in time. And I can be doing other tasks such as installing chips into cars.

Touchy as I used to work there and so many people make the C mistake:

McClaren => McLaren

Mc or Mac is the Gaelic form of "son of". So son of Laren or in English we would have said Larenson or similar.

No capital C in McLaren.
I should've known better because the McCaskie clan is in my bloodline. Silly me.

Reminds me of the Paris in the
the Spring trick.
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