Car track widths

All things related to racing at FRC
User avatar
gordon
Site Admin
Posts: 3018
Joined: Thu Feb 04, 2010 2:34 pm
Location: Trinidad & Tobago
Contact:

Re: Car track widths

Post by gordon »

BTW guys, I wasn't planning to give away any of my tuning secrets here, but this one I'll do in the interest of this topic. Here it is:

Image

Width is not the only consideration where handling is concerned.

Do with it what you will!
steveaca
Posts: 1574
Joined: Mon Feb 08, 2010 1:12 pm

Re: Car track widths

Post by steveaca »

Interesting read Gordon although the triangle shown in the diagram does not really depict the car's rear track (as the track is really measured from the tyre's mid point).
One comment I'd make on the principle as stated though is that although for a given rear track, the longer the guide -to -axle distance the better (as this decreases the guide pivot angle), the principle would also suggest that for a given guide-to-axle distance, the narrower the track the better, as this then would lead to a reduced guide pivot angle !
User avatar
gordon
Site Admin
Posts: 3018
Joined: Thu Feb 04, 2010 2:34 pm
Location: Trinidad & Tobago
Contact:

Re: Car track widths

Post by gordon »

steveaca wrote:Interesting read Gordon although the triangle shown in the diagram does not really depict the car's rear track (as the track is really measured from the tyre's mid point).
You're seeing it as I got it Steve. But we know what he means.
steveaca wrote:One comment I'd make on the principle as stated though is that although for a given rear track, the longer the guide -to -axle distance the better (as this decreases the guide pivot angle), the principle would also suggest that for a given guide-to-axle distance, the narrower the track the better, as this then would lead to a reduced guide pivot angle !
My point exactly.
RameshB
Posts: 599
Joined: Tue Jan 15, 2013 12:30 pm

Re: Car track widths

Post by RameshB »

Thanks, best to work with is no visible Tyre when viewed from the top.
User avatar
gordon
Site Admin
Posts: 3018
Joined: Thu Feb 04, 2010 2:34 pm
Location: Trinidad & Tobago
Contact:

Re: Car track widths

Post by gordon »

RameshB wrote: Mon Jan 21, 2019 12:48 pm Thanks, best to work with is no visible Tyre when viewed from the top.
Well that's the simplest solution Ram. One thing though, we need to address the possibility of someone putting on extra-wide flares. What are your thoughts on this?
obrie
Posts: 206
Joined: Mon Sep 26, 2011 7:02 pm

Re: Car track widths

Post by obrie »

I think we have to keep one thing in mind here. The width of the scalextric track is fixed, devide that in half (2 lanes) and take a bit more off to make passing realistic and you have a max track ....period. We can adjust for different classes using the widest for the faster classes or F1 or whatever and the narrower for the HS etc.
No matter the car, the class rule will apply. Flaring can also be limited by this “max” per class to keep the realism at the forefront, no funny cars in other words. A little bit of tire peeping out past the body work is realistic and will give the “narrower” cars the opportunity to match the wider cars in handling (Cortina vs Capri in HS is an example). Just my 2 cents.
User avatar
gordon
Site Admin
Posts: 3018
Joined: Thu Feb 04, 2010 2:34 pm
Location: Trinidad & Tobago
Contact:

Re: Car track widths

Post by gordon »

I get your points O'Brie. Whatever we all decide on, we have to put it into words and include it in the regulations so that it's concrete and not open to interpretation.
User avatar
gordon
Site Admin
Posts: 3018
Joined: Thu Feb 04, 2010 2:34 pm
Location: Trinidad & Tobago
Contact:

Re: Car track widths

Post by gordon »

Here are some track dimensions that I verified online:

Image

The width of the widest 1/32 car I can find so far is the Scalextric F1 Lotus 72, at 6.6 cm (see here - scroll down for the specs). So if we set this as the maximum allowed period, we will have 0.6 cm between the outer wheel and the edge of the track and the same for the inner wheel and the centre of the track. This works out to be 1.2 cm between two 6.6 cm wide cars.

Now we can decide what maximum limits to put for each class (if necessary) and the maximum amount of tyre "peeping" allowed for any class. (I still think that 2 mm is acceptable.)
obrie
Posts: 206
Joined: Mon Sep 26, 2011 7:02 pm

Re: Car track widths

Post by obrie »

G can you put up a spreadsheet with the widest and narrowest per class. Not all cars just a sample. This will give us all a clear idea of what the sequence of reduced width will be starting at 6.6 for F1 and maybe R-LMP. Down through the classes
User avatar
gordon
Site Admin
Posts: 3018
Joined: Thu Feb 04, 2010 2:34 pm
Location: Trinidad & Tobago
Contact:

Re: Car track widths

Post by gordon »

O'Brie wrote: Tue Jan 22, 2019 7:33 pm G can you put up a spreadsheet with the widest and narrowest per class. Not all cars just a sample. This will give us all a clear idea of what the sequence of reduced width will be starting at 6.6 for F1 and maybe R-LMP. Down through the classes
I had actually been planning to put up info for us to work with. I want to try to keep things as simple as possible so I'm still at the data-collection stage. To this end, I've been researching and measuring for the past week or so and have come up with the following so far. I'm hoping that those of you with any of the cars listed can fill in the blank slot car widths (along with the brand of slot car) for me. Please only measure the body widths, not the wheels/tyres. Here's what I have so far:

Image
Post Reply