12 replies to this topic

[Steve Okeefe]

X-Minus-1

An incognito original design by Steve Okeefe

 

 

This one is a bit of a wolf in sheep's clothing. Look carefully and you will see that the drop arm is not a drop arm at all, and that this chassis is in fact a long wheelbase, short guide lead Iso-fulcrum with the hinge located at the front of the motor bracket.

 

 

The front wheels are 3/4", the rears 7/8", but the odd shape of the X-Minus-1 body calls for a 4-3/8" wheelbase, and even with a shortened pickup guide, allows for only a rather short 4-3/4" guide lead.

 

 

In this photo set the Iso-fulcrum down stop had not yet been installed.

 

[olescratch]

I'm  looking to build an Iso for a resin body project and this one caught my interest.  I would like to know a few more details if possible especially the weight of the basic chassis (minus wheels, motor, guide, etc.). Thank's  in advance, John. 

[Jairus]

Sweet looking Steve!

[Maximo]

Yeah Steve, continue with this build, please!

 

 

-Max

[SlotStox#53]

Sweet looking Thingie creation Steve! is there a full article on this one?

[Steve Okeefe]

Jairus,

 

Thanks! 

 

John, Dave & Paul,

 

Sorry to disappoint, but I don't have this chassis anymore and did not write up a full construction article.  The chassis was built for and sold to Tom Scott (tjsguns) four years ago; you'll have to ask him.

 

On the other hand, I can help with a drawing of the chassis as-built and some construction notes:

 

 

Note that the inner piano wire rail is .078" diameter, whereas all the other piano wire rails and brass rods are .063".  Where the cross rails (three places) and brass tube (one place) intersect the .078" rail, the .078" rails are notched to fit.

 

Because this is a bit of a "trick" chassis design, it is not obvious how the center section and the ISO section parts go together.  So, I've provided a false color diagram to help make it clearer.  All the parts colored red are soldered together, same thing for the parts colored green.  Nowhere are the red parts and green parts soldered to each other:

 

 

Hope this helps!

 

[Jairus]

No disappointment here. I painted the body for that chassis and took some pictures of the completed project. 

 

 

Motor by John Havlicek.

 

 

Guess Tom failed to show the troops...

[Gator Bob]

Doing the math.... It might be called X-Minus-1 but I don't see anything Negative at all (if X = 0).

 

    

[SlotStox#53]

Definitely NO disappointment here either The drawings showing the where & the how and pictures from Jairus (Thanks btw   ) Gives perfect info on the car. Awesome chassis design & fab body Jairus , is it any specific Thingie or a one off? Certainly looks the $$$      color scheme really finishes this one off.

 

Thanks!

[olescratch]

The pictures and color diagrams helped to answer many of the questions that I had about the design, but also created another. How is the Iso section kept in place? It can't be soldered at the pivot to allow for movement, so what keeps it from coming apart? John. BTW Jarius, amazing paint as usual.

[Gator Bob]

 How is the Iso section kept in place? It can't be soldered at the pivot to allow for movement, so what keeps it from coming apart?

John,

I'm sure Steve will clarify.

Thinking it is this connection that holds it together. 

[Steve Okeefe]

John,

 

Simple, but not obvious. 

 

Here's another false color drawing (illustrations work great, don't they?) that shows how it works.

 

The entire main ISO rail (shown in purple)  is one piece of piano wire:

 

 

Check the photos of the bottom of the chassis and you can see how the main ISO rail passes through the hinge tube that is soldered to the motor bracket.

 

The brass secondary ISO rails (tied and soldered to the main ISO rail near the hinge) slide up and down against the .063" brass "rub strip" soldered to the center section, keeping the whole ISO section centered.

 

Piece-o-cake! 

[olescratch]

Thank's Steve.  I couldn't see it working if each side was a separate piece.  I do believe that seeing is believing, but I couldn't see it.  Thank's for the pictures and the explanations of them, John