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Scratchbuilt chassis for Williams FW08B six-wheeler 1982


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#1 Cheater

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Posted 04 January 2021 - 09:26 AM

Snagged this from the BSCRRA Classic page on Facebook.
 
David Ensor's terrific craftmanship and design are well worth showcasing here at Slotblog.
 
"Constructors entry - Chassis for Williams FW08B 6 Wheeler 1982.
 
Sympathetic new construction to tech of era, late '70s-early '80s. New chassis, wheels, tyres. Period Mura B motor, rewound, fully refurbished with mostly vintage parts. Magnets re-zapped.
 
Features:

Four driven wheels at rear.
Bespoke gear train, split left and right as part of vehicle suspension. Halves nominal torque to each gearset.
Uses rocker arm suspension, rear track rod and anti roll bar return to neutral spring. All controlled by ball bearings, sized to suit wheel set. Nomionally 1/16 inch wide, large flange. Twelve ball bearings in all for suspension, two normal for centre axle.
Rocker arm ensures all wheels sit independently on track undulations.
Centre pivot keeps rear and front stable under torque.
Front wheel independent stub axles.
Outrigger body mounts have offset hinge to provide body isolation and springing.
Williams body (Betta FW08) lengthened by adding 12 mm offcut of 7 thou body shell stuck in place with clear varnish.
Shown mostly for effect, as it may not be considered concours - as you can tell by the deliberate mistake.
 
Anyway it appears to work on the bench."

Shouldn't surprise anyone that David is a former Senior Consultant Engineer at MIRA (Motor Industry Research Association) in the UK.

 
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#2 mreibman

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Posted 04 January 2021 - 09:55 AM

Super interesting!
 
So much so that I looked up about the original car and if anyone is interested, have a look HERE.


Mike Reibman
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#3 Pablo

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Posted 04 January 2021 - 09:59 AM

Looks like it's wired to run the arm backwards. I don't think they made reverse timed arms tagged "NCC 20."
 
Maybe it's on purpose to slow the motor down?  :)

Paul Wolcott


#4 MSwiss

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Posted 04 January 2021 - 10:19 AM

Pablo,

Although I had one, in about 1971 or '72, I don't remember which way they turned/if the car was can or endbell drive.

I'm guessing it was can drive with the spur on the same side as contemporary slot cars.

Are you aware the axle is supposed to turn backwards?

Mike Swiss
 
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#5 Pablo

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Posted 04 January 2021 - 10:32 AM

Ahhh, that explains it. The arm is turning the correct direction to make the axle spin backwards.   :good:


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Paul Wolcott


#6 Jay Guard

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Posted 04 January 2021 - 10:48 AM

This is sooo cool and right up my alley!

 

Only thing is it looks like it weighs maybe 150-200 grams so even though it may handle fine a NCC20 might not really be enough power to move such a heavy machine. I would recommend my favorite wind, two turns of coathanger wire!  :D


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#7 MSwiss

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Posted 04 January 2021 - 11:05 AM

???

A 40-turn arm, on a long stack, would have plenty of torque.

More than any G7 arm, unless it was custom with very little timing.

Just put on the appropriate pinion.
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Mike Swiss
 
Inventor of the Low CG guide flag 4/20/18
IRRA® Components Committee Chairman
Five-time USRA National Champion (two G7, one G27, two G7 Senior)
Two-time G7 World Champion (1988, 1990), eight G7 main appearances
Eight-time G7 King track single lap world record holder

17B West Ogden Ave., Westmont, IL 60559, (708) 203-8003, mikeswiss86@hotmail.com (also my PayPal address)

Note: Send all USPS packages and mail to: 5858 Chase Ave., Downers Grove, IL 60516


#8 Bill from NH

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Posted 04 January 2021 - 11:48 AM

Looks like it's wired to run the arm backwards. I don't think they made reverse timed arms tagged "NCC 20."
 
Maybe it's on purpose to slow the motor down?  :)

 

There were some. My 1970  "NCC 20 Kit" from REHCo had a reverse timed Mura arm. I might still have it. It was commonplace for Mura to sometimes make a wind in both directions. Thorp did too, but I don't know if they wound NCC 20 arms. I never owned Thorp arms, just used their reconditioning service prior to Camen.


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#9 dc-65x

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Posted 04 January 2021 - 05:53 PM

I can't help it...   :crazy: ... I have to share one of my favorite cars. Here's my version of a six-wheeler "fantasy" Lotus and a link to the build:

 

Six-wheel racer

 

6-wheeler 141.JPG

 

6-wheeler 050.JPG

 

6-wheeler 136.JPG

 

I also have a couple of NCC20 arms that are CW timed but most are CCW.


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Rick Thigpen
Check out Steve Okeefe's great web site at its new home here at Slotblog:
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There's much more to come...


#10 Jesse Gonzales

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Posted 05 January 2021 - 05:25 AM

Mura had a clockwise division named "Lenz." I don't recall if Lenz released any NCC-tagged arms though. In AZ back in the old days, Bill Dillon, a Seattle transplant, ran Lenzes and those were opens as that's all there were at the time.

 

Jess Gonzales



#11 Zippity

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Posted 05 January 2021 - 05:58 AM

Rick,

 

Have you built a Tyrell six-wheeler?  :)

 

Tyrrell-P34-ft.jpg


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Ron Thornton

#12 dc-65x

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Posted 05 January 2021 - 04:45 PM

No, I haven't built any other six-wheelers, Ron. I was drawn to the four rear wheel setup so I could fiddle around with the gearing.
 
That Tyrell is very cool though.
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Rick Thigpen
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#13 Isaac S.

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Posted 05 January 2021 - 04:56 PM

Mura owned Lenz? Never knew. I love Lenzs so that is very cool, thanks. Very much so as Lenz got successful in 1965 when almost no one had heard of Mura. I also thought Dave Lenz was in control, not Ron Mura. 


Isaac Santonastaso





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