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1/24 Outlaw sprint car


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#1 iv_man

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Posted 01 April 2019 - 04:49 PM

Gidday. Here's something just for fun. 

 

Where I am we don't have an oval track so I'm making this work for both left and right hand turns. So the build is a little unorthodox. 

 

One of the aims is to keep the car slow, good torque/low grip to help get it sideways and some mechanical trickery to get the chassis to take on the correct attitude in the turns i.e. to slide out from under the top wing (like the real ones do due to all the force on the wing). 

 

Here's a few images to get the brain wondering "what is he up to there then...?"

 

IMG_20190307_205850.jpg

 

IMG_20190309_213323.jpg

 

IMG_20190325_214344.jpg

 

IMG_20190329_231453.jpg

 

IMG_20190401_063648.jpg


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Ivan Bailey





#2 Geary Carrier

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Posted 01 April 2019 - 04:59 PM

Yes... :good:


Yes, to be sure, this is it...


#3 Bill from NH

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Posted 01 April 2019 - 06:20 PM

Ivan,

Your chassis looks great. I will ocasionally see brass rod sprint car chassis on eBay, but most sprint cars here will use a brass pan chassis such as the Sprints Plus or a cut-down Womp.

Who makes the rear end gear box you show? As your build further completes, be sure to post more photos. I want to see how the complete car goes together.

Bill Fernald
 

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#4 iv_man

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Posted 01 April 2019 - 06:37 PM

Hi Bill,

All of the parts are fabricated on the go. Apart from the obvious such as gears, axles, and bushes, etc., nothing is bought.

There was a loose plan in my mind but very much a case of figuring out what is needed next and finding a way!
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#5 iv_man

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Posted 02 April 2019 - 11:59 PM

Getting closer to running this on track.  Still lots to do finishing the steering of front wheels and the mechanical link to the rear end.  The link to the rear will lift the inside rear causing the chassis to dip like a real sprint car does due to the load against the top wing i.e. more like a bike drifting into a corner.

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  • IMG_20190403_163939.jpg

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#6 Cap Henry

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Posted 03 April 2019 - 06:29 AM

Thats pretty cool!

#7 Dominator

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Posted 03 April 2019 - 01:18 PM

Very cool
A motor is only as fast as the chassis it's in.
 
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NERR photos from 2012-April 2016
NERR photos from 2016 to now

#8 iv_man

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Posted 09 April 2019 - 03:38 PM

Nerf bars changed for much simpler design - was looking like a midget before!

 

 

IMG_20190409_212836.jpg IMG_20190409_212403.jpg


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#9 Martin

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Posted 10 April 2019 - 10:45 PM

Interesting build. I like it. What scale is this. It looks big.

Is it the motor pinion climbing over the front gear that makes the chassis tip?

I am concerned about the high C.G.

Will you stagger the rear tires?

Look forward to seeing how this goes through a turn.

Can you do a video ?


Martin Windmill

#10 iv_man

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Posted 11 April 2019 - 03:32 PM

Interesting build. I like it. What scale is this. It looks big.

Is it the motor pinion climbing over the front gear that makes the chassis tip?

I am concerned about the high C.G.

Will you stagger the rear tires?

Look forward to seeing how this goes through a turn.

Can you do a video ?

Hi Martin.  It's 24th scale.

 

I don't have access to any oval track and there is nobody racing these anywhere near me.  This is a "for fun" build.

 

So being that I will only get to drive on a flat track circuit the whole design is meant to turn left and right, therefore no stagger of the rear end or wheel diameter or the top wing.

 

Not too worried about the motor being mounted high.  There's plenty of room underneath for ballast.  The speed is low as the pinion/gear ratio is done twice over; once at the motor and once at the rear end.  My final drive gear ratio is around 11:1

 

The tipping of the chassis will be done mechanically by lifting the inside rear wheel and then the chassis will drop in that direction (like leaning a bike into a corner I am shifting the weight left and right above the center).  So low grip is essential for this as the car has to actually get sideways for this to work.  The fact that there is a lay-shaft under the motor all came about because I needed a center line about which to do all this rolling and pivoting.  So although this is spinning when driven by the motor I also have slung the front and rear end on the same shaft.  With all the shafts, axles and steering components I have used 18 oilite bushes so far to handle all the moving parts.  I have used some to construct the front kingpin and steering parts just because they're easy (see earlier photo).

 

I will certainly be taking plenty more photos and making some videos of it running - that's many nights and very many coffees away yet though!


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#11 Martin

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Posted 11 April 2019 - 07:26 PM

Looking forward to seeing it on the track.


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#12 iv_man

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Posted 28 April 2019 - 05:48 PM

Still not quite on a track for test drive yet - but currently sporting a cardboard mock up of the wings.

 

It runs, it pivots, it steers.

 

IMG_20190427_165914.jpg IMG_20190428_013554.jpg


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#13 iv_man

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Posted 29 April 2019 - 05:15 PM

Further mock up.  All body parts are temporary and a fresh set will be made to stay with this model.IMG_20190429_193336.jpg


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#14 iv_man

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Posted 05 May 2019 - 10:26 PM

Proper wings now - sign writing of some description and needing to make the tail tank.

 

The car has had a couple of drives but still needs to be decided exactly how to operate the rear end.  As hoped the motor screams yet the car basically drives at a proper scale speed.  So happy with that.

 

The end is near!

 

IMG_20190504_140910.jpg


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#15 Bill from NH

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Posted 06 May 2019 - 08:57 AM

Ivan, can you show us how you build the tail tank? I've often thought this was the most difficult part of a sprint/midget body to scratchbuild, unless you modified a piece from a static model or lexan body. A few years back, one fellow was making them from a printed paper. They looked okay, but not 100% realistic.


Bill Fernald
 

:) Insect jokes bug me! :)


#16 iv_man

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Posted 06 May 2019 - 04:47 PM

Ivan, can you show us how you build the tail tank? I've often thought this was the most difficult part of a sprint/midget body to scratchbuild, unless you modified a piece from a static model or lexan body. A few years back, one fellow was making them from a printed paper. They looked okay, but not 100% realistic.

Not sure that mine will be any better - as best to scale as I can while fitting the model.  Very likely I will print the tail tank.  Here is what my model of the tank looks like so far;

 

TT01.JPG TT02.JPG TT03.JPG


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#17 SpeedyNH

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Posted 06 May 2019 - 07:41 PM

looks good to me!


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#18 iv_man

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Posted 26 May 2019 - 05:38 PM

So nearly there!

 

A borrowed tail tank in this photo.  Other image is of printed tanks, one to go on this model.

 

Rear torsion bars are in now.  Needs a little test time.

 

IMG_20190524_212232.jpg

 

IMG-20190526-WA0000.jpg


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#19 iv_man

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Posted 29 May 2019 - 07:50 PM

Ever closer - the track is way too sticky for this but it is due for a clean soon and will stay clean for an RTR meeting coming up in two weeks - so a sideways I will go....!!

 

IMG_20190527_193334.jpg


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#20 SpeedyNH

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Posted 29 May 2019 - 07:55 PM

sweet!


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#21 Geary Carrier

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Posted 29 May 2019 - 10:57 PM

Design, Engineering, Persistence... :good:


Yes, to be sure, this is it...






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