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tonka500

The Isochronus Curve

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Hi Peeps,

I'm in the early planning stages for a routed slot track. I've got about 4' by 18' to play with and am thinking of a 2 lane analog Bertrand 8 style track. Something like this to give a rough outline:
Bertrand02.png

Through the wonders of youtube algorithms this video got prompted to me today and I found it really interesting:

https://www.youtube.com/watch?v=eBc827pwKf0

It got me thinking about making one of the big 180 degree corners at either end of the track an isochronus curve.

Has anyone included an isochronus curve in their track? If so how does it run? And if not got any guesses? I tend to make my curves elliptical as I like a smooth transition from straight to curve. Do you think an isochronus curve would have an OK blend from straight to curve?

Thanks!
Andrew
 
Edited by tonka500
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I think a curve such as that would work well, and would be interesting to drive. That is only an opinion, not from experience as I've drawn tracks with elliptical curves and with opening/ closing radius curves that I think would go well, bit unfortunately, never actually had one built or built one myself! :lol:

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Perhaps you could experiment with Scalextric track pieces using a combination of R1, R2, R3 curves to get a similar profile and see how that drives?

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A couple of thoughts...

 

1. Tonka - didn't you have a quite marvelous routed track years ago?

2. My Scaly Sport track 5' x 16' has a couple of increasing / decreasing radius turns R3/R3/R2/R2/R2 - and a 180 degree hairpin of R2/R1/R1/R2 - which works quite well.... with the track being bi-directional it makes the R3/R3/R2/R2/R2 sequence at either the beginning or end of the long straight ( depending on direction... ) an interesting challenge in regards to braking or accelerating ( depending on direction ... ) 

So I say - if you can do it, go for it!

 


Cheers,

 

Tony.

 

There's only two questions:

 

1. What direction do you go

2. What's the Lap Record?

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Thanks for the suggestions. Much appreciated. 

 

Yeah Bov I had a track a few years ago that was heaps of fun. It's gone to the great race track in the sky now. Getting the need to slot again though!

 

I haven't got any plastic track to try the curve out on. Think I'll sketch it out in full scale (about 1200mm diameter) and see how it looks with a car our two sitting on it.

 

Keep ya updated :)

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I have a decreasing radius Policar corner with R4, R3 and finishing in R2 onto a 5 metre straight. It’s a challenge braking just the right amount to get a nice fast exit for maximum speed on the straight. 

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Going wide to tight, or even tight to wide, is pretty common. But, and this is only my personal opinion, a corner that starts tight, widens out, and then tightens up again before the straight, is an annoying turn to navigate. THAT'S what an isochronus curve it. I'd rather go in on a tight turn, and leave that tight turn for a short straight into another tight turn. 

Isochronus.jpg

 

Edited by MrFlippant

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Thanks for the pic Flip. It's not the nicest looking turn in the world is it.

 

Might just shelve the idea and stick to the tried an true parabolics.

 

Thanks too Vinno, that sounds like a home track advantage kinda corner:D

 

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Hi Tonka. In my humble opinion the sample track contains no true Isochronus curve. Sure the right hand end has a short straight section but this is not a true Iso curve which is based on different radii curves although the outgoing curve bears a slight resemblance. In mthe two tighter curves are clearly opinion Parabolic. Have to say though that my preference if for corners that either tighten up or broaden. This helps a track flow but still involves some degree of additional skill over regular bends particularly when used in combination. These can easily be set up with set plastic track but easier if routing your own. For what it is worth. Regards Chas Le Breton

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