New Test Rig. Testing Past 10ms

Ade · 2021-01-11

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

injectorman

· #41 · Jan 28, 2021 (Edited by Moderator)

Dr_C said:
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...

c

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 Slot.it 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.

Rick

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Dr_C

· #42 · Jan 29, 2021 (Edited by Moderator)

I dont disagree, however in my mind a good raceway (space permitting) should have as big a range of speeds as possible... at one extreme some very tight winding hairpins and at the other extreme some seriously long straights. If I can get cars up to a speed of 9.5m/s and back down to zero in less than 6 metres of linear track powered by an ARC PRO situated on my livingroom rug (which I can) surely serious raceways can achieve that speed or greater on their longest straights? 10m/s seems quite a reasonable and perhaps minimum expectation for accurate speed measurement, car identification and lap recording.

So I think you are right to focus into the10-15m/s zone... and that is why I am a big fan of your new loop endeavour. I just hope you can achieve the 15m/s upper end with all the technology you have in play.

c

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injectorman

· #43 · Jan 29, 2021 (Edited by Moderator)

Dont forget you need stopping room. So a 6 m straight gives you 4.8m of acceleration
As I said with a Slot.it 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?

Rick

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Dr_C

· #44 · Jan 29, 2021 (Edited by Moderator)

Rick...

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?

c

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injectorman

· #45 · Jan 29, 2021

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

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injectorman

· #46 · Jan 29, 2021 (Edited by Moderator)

Dr_C said:
Rick...

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?

c

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

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Dr_C

· #47 · Jan 29, 2021 (Edited by Moderator)

A few quick thoughts from me in response, and then I will leave it there...

1/ I use the out-of-the-box Hornby McLaren F1 to represent just that... an out of the box but fast product.
2/ I use the NSR F1 as a representation of a tuned up enthusiast car - switching blades, motors, gears, braids and axle stoppers to get maximum drag strip speed.
3/ the drag strip is not just plastic track - there is a lot of high tech instrumentation... no point in trying to reach into the 10-15m/s zone if you dont know precise speed.
4/ I havent as yet shared any speed data for a 12m drag strip - til now my strip has been just under 6m - I think 5.7m if I remember correctly (can check back).

c

edit: put blades twice... second time I meant braids... now edited

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RikoRocket

· #48 · Jan 29, 2021

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.

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Dr_C

· #49 · Jan 29, 2021 (Edited by Moderator)

Rick, if you are planning something similar, the dragstrip I used to reach 9.5m/s with a tuned up NSR -F1 was:

4.4 metre acceleration lane with average speed measured over last 0.3metre
short section with ID sensor module
short rails isolator section
auto deceleration zone (Riko method using second powerbase) - need to check length.

Cushion is only required for cases of brake failure.

Its great to see cars wound up from zero to 9.5 m/s then back down to zero again using only motor and then dynamic braking.

I am not suggesting this is better or worse than the 1.81metre diameter loop approach - certainly both approaches are complimentary.

Next time round I am thinking an 8.5 metre acceleration lane as the NSRs have not maxxed out after 4.4metres.

c

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injectorman

· #50 · Jan 29, 2021

RikoRocket said:
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 😊
Too many scary warranty claim videos on YouTube for McLaren.😊

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injectorman

· #51 · Jan 30, 2021

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.

Rick

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injectorman

· #52 · Jan 30, 2021

RikoRocket said:
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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