Jump to content




Photo

Recreating Classic Industries Manta Ray-based racer


  • Please log in to reply
11 replies to this topic

#1 Bridgehampton66

Bridgehampton66

    On The Lead Lap

  • Subscriber
  • PipPipPipPip
  • 264 posts
  • Joined: 12-March 21
  • Gender:Male
  • Location:Cambridge, MA

Posted 21 July 2026 - 07:34 AM

Hello all,

 

When I attended the wake/yard sale at Buzz-a-Rama a couple of years ago, I saw some ancient parts, clusters of them, that got me thinking about my first serious slot racer.  Going up and down the aisles of cardboard boxes, representing some proportion of the vast basement trove that Buzzy had been collecting since the mid-60's, I began picking up this and that ancient, obsolete, and totally nostalgic bit of gear.

 

Classic Manta Ray chassis, new in the blister pack; Mille Miglia magnesium fronts; Weldun aluminum 64p spurs and steel pinions; a pink K&B 36D motor; a balanced and trued 36D rewound armature...  it seemed like the parts themselves were guiding me to each successive box.  And was merely the means by which they might be truly reunited.

 

Anyway... I'm primarily a Retro and HO magnet car racer, so this deep time-warp activity represents something pretty different.  Encourages a meditation on how nicely much of this gear was made, and, at the same time, how insane the designs, primarily regarding their center of gravity.  3/16" ground clearance!!!

 

Once I have the photos sized down, I'll include a couple here.  And, at the risk of being boring, can tell the little story that goes with this.

 

But a couple of questions for the interested and informed, please?

1). What were the diameters of the front and rear tires on the Manta Ray, right out of the box?

2). What was the gear ratio, and the # of teeth on the pinion and spur?

 

Thank you!

 

More soon.

 


  • Paul Menkens likes this

Rob Hayes

Catfish International (HO) Speedway - The Brystal Catfish

Modelville Hobby and NERR - 1/24

MARC/New England - HO

https://www.berklee....ple/rob-hayes-0





#2 don.siegel

don.siegel

    Grand Champion Poster

  • Subscriber
  • PipPipPipPipPipPipPipPip
  • 5,954 posts
  • Joined: 17-February 06
  • Gender:Male
  • Location:Paris, France

Posted 21 July 2026 - 07:51 AM

Sounds interesting, looking forward to your story. 

 

Gear ratio was 2.4:1, but not sure of the number of teeth. Still looking for my Manta Ray to check the rest. 

 

Now that's strange: My Manta Ray was in my Manta Ray box, and not in the Astro=V box... 

 

Rear tires are 1-1/4" x 3/8"; Fronts are 1" x 1/4" - on mine, which I think is original, they're both black; I think later versions had colored sponge tires. Pinion is 18t if memory serves, which would make the spur gear about 44t. I'm sure somebody here will be able to give you the exact sizes. 

 

Don 

 

Here are some photos

 

Classic Manta Ray-1.jpg

 

Classic Manta Ray-2.jpg

 

Classic Manta Ray-3.jpg

 

Classic Manta Ray-4.jpg

 

Classic Manta Ray-6.jpg

 

Classic Manta Ray-7.jpg

 

Classic Manta Viper ad-MCS0266.jpg


  • Bridgehampton66 likes this

#3 don.siegel

don.siegel

    Grand Champion Poster

  • Subscriber
  • PipPipPipPipPipPipPipPip
  • 5,954 posts
  • Joined: 17-February 06
  • Gender:Male
  • Location:Paris, France

Posted 21 July 2026 - 08:04 AM

Introducing the Manta Ray. 

 

Classic Manta Ray preview-RC0565.jpg

 

Rod & Custom, May 1965


  • Tex and Bridgehampton66 like this

#4 Mike Patterson

Mike Patterson

    Village Luddite

  • Subscriber
  • PipPipPipPipPipPipPip
  • 2,681 posts
  • Joined: 14-October 07
  • Gender:Male
  • Location:Zanesville, OH

Posted 21 July 2026 - 10:54 AM

I think the gearing was 3:1, with a 16T pinion and a 48T spur. IIRC, that was pretty much standard gearing for a 36D sidewinder back then.


  • Bridgehampton66 likes this

 It's weird being the same age as Old People.


#5 don.siegel

don.siegel

    Grand Champion Poster

  • Subscriber
  • PipPipPipPipPipPipPipPip
  • 5,954 posts
  • Joined: 17-February 06
  • Gender:Male
  • Location:Paris, France

Posted 21 July 2026 - 10:59 AM

Mike, I got the 2.4 figure out of the RTR Roundup article in Rod & Custom; couldn't confirm anywhere else. Cox was 3:1 as you say, but some of the others were lower numérically as well. 

 

RTRCHART -RC0166.jpg


  • Bridgehampton66 likes this

#6 slotcarone

slotcarone

    Posting Leader

  • IRRA National Director
  • PipPipPipPipPipPipPip
  • 4,179 posts
  • Joined: 23-January 07
  • Gender:Male
  • Location:Dutchess County, NY

Posted 21 July 2026 - 01:37 PM

With that gearing no wonder these 36D motored cars had no brakes! LOL  :)


  • Bridgehampton66 likes this

Mike Katz

Scratchbuilts forever!!


#7 don.siegel

don.siegel

    Grand Champion Poster

  • Subscriber
  • PipPipPipPipPipPipPipPip
  • 5,954 posts
  • Joined: 17-February 06
  • Gender:Male
  • Location:Paris, France

Posted 21 July 2026 - 01:46 PM

True, but none of the other motors had good brakes either (well, except for the Russkit twin-motor jobs), and the best times on the 250-ft Engleman were all posted by cars with the lower numerical gear ratios - that may have been the kind of track these manufacturers were aiming for - and a lot of them were based in California.  

 

Don 


  • Bridgehampton66 likes this

#8 blue&orange

blue&orange

    On The Lead Lap

  • Full Member
  • PipPipPipPip
  • 306 posts
  • Joined: 01-December 14
  • Gender:Male
  • Location:Cresco, PA

Posted 21 July 2026 - 02:46 PM

Hey Rob, if you're interested in building a runner, Paul Gage (Canada - eBay) sells good urethane tires, both front and rear, and even in colors.

 

If I'm correct, the original rears were the German rubber that was popular at the time.  I took my old Astro-V out of the box after 50 years, which used the same rears, sanded the tires lightly, and they were perfect.

 

And you already may know there were 2 chasses -- the first was endbell drive only; the second, like Don's pic above, had the separate chassis piece for can drive mounting.

 

A few years back at Trains and Lanes we did a vintage race day and one race had a whole field of Manta Rays, 6 or 7 -- lots of fun!


  • don.siegel and Bridgehampton66 like this
Chris Matthy

#9 dc-65x

dc-65x

    Grand Champion Poster

  • Subscriber
  • PipPipPipPipPipPipPipPip
  • 7,204 posts
  • Joined: 14-February 06
  • Gender:Male
  • Location:Captain Rick: The only vintage slot car nut in SW Oregon?

Posted 21 July 2026 - 03:54 PM

Hi Rob,

 

Here's a link to my modified Manta Ray that might be useful:

 

Manta "RAM" Ray

 

f9cf1523-15a4-40c4-9984-32dc573b97a3.png


  • Jencar17, Tex and Bridgehampton66 like this

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


#10 Bridgehampton66

Bridgehampton66

    On The Lead Lap

  • Subscriber
  • PipPipPipPip
  • 264 posts
  • Joined: 12-March 21
  • Gender:Male
  • Location:Cambridge, MA

Posted 21 July 2026 - 04:23 PM

This is great, fellas -- all of it.  More than I could have hoped!

 

I'll return to the bench, armed with this information, and begin again, later

this week.

 

Much obliged!


Rob Hayes

Catfish International (HO) Speedway - The Brystal Catfish

Modelville Hobby and NERR - 1/24

MARC/New England - HO

https://www.berklee....ple/rob-hayes-0


#11 slotcarone

slotcarone

    Posting Leader

  • IRRA National Director
  • PipPipPipPipPipPipPip
  • 4,179 posts
  • Joined: 23-January 07
  • Gender:Male
  • Location:Dutchess County, NY

Posted 21 July 2026 - 05:44 PM

The Manta Ray that I have which seems to have never been modified has a pinion gear held on with a set screw. :)


Mike Katz

Scratchbuilts forever!!


#12 Mike Patterson

Mike Patterson

    Village Luddite

  • Subscriber
  • PipPipPipPipPipPipPip
  • 2,681 posts
  • Joined: 14-October 07
  • Gender:Male
  • Location:Zanesville, OH

Posted 24 July 2026 - 09:30 AM

The Manta Ray that I have which seems to have never been modified has a pinion gear held on with a set screw. :)

My Stinger (RIP) had the same pinion, IIRC. Never owned a Manta Ray.


 It's weird being the same age as Old People.






Electric Dreams Online Shop