1238-Cc3 / For A Thousand Mothers

[CMF3]

As alluded to in another thread, once I got the completed 1237-Cc3 built, and could fiddle with it and the 1237-Cc2 on some test blocks, pushing, poking, prodding, I jumped right into the build of the 1238-Cc3.

To reiterate for everyone, and especially those confused by all this blathering rigmarole I put up here, the major design difference between the 1238-Cc3 and its predecessor 1237-Cc3 chassis is the incorporation of Indirect Main Rails (IMR, for short), which in some parlance are referred to as “Z-rails”. However, in the 1238 design the IMR’s would be more correctly called “V-rails”. The center “main rail” for the 1238 extends from the forward central angle of the rear motor/axle assembly only to the guide tongue mount (Center-Guide section, or CG, for short). The medial portion of the IMR’s attach to the forward sides of the CG section, extending rearward; each lateral portion of the IMR’s attach to the rear of each adjacent medial portion and extend forward to attach to the front spanning wire (Front Spanner, or FS, which is a four wire assembly now). So, I guess if you wanted to, you could describe these as “VIV rails”…

The other big change from the 1237 to the 1238 is the elimination of the dynamic pans between the Buttress rails and the CG section, or IMR’s in the case of the 1238. Though I was pretty sure this would put the 1238 as an RTR car well under that 100-gram number thing, it had to be done, as the dynamic pans would be eliminated on the next chassis, the 1239, anyway, and it made more sense for comparison purposes to eliminate them at this step in the design progression.

So, the 1238-Cc3 came out like this:












While the 1238 is a bit chunkier in the middle from the IMR’s, as thought, the RTR car for the 1238-Cc3 came out to 93.6 grams, even lighter than the 1237-Cc3 (95.2 grams), which was well below the original 1237-Cc2 (102.2 grams). This also puts it well below that 100-gram number thing, but as noted elsewhere, this doesn’t matter when comparing the design/structural differences between the chassis in the progression. I can always consider the 100-g thing at a later time…

Speaking of a later time, the original plan was to take the 1237-Cc3 and 1238-Cc3 over to Fast Eddie’s Raceway this week for some test runs… At least, that was the plan, until I screwed up my back something serious working at the hospital last Friday night… had to go to the ER… So, instead of doing what I’d planned this week, I’m sitting around the domicile chunkin’ down pain meds, and trying not to do anything strenuous… like lugging a bunch of slot car stuff to the raceway… in fact, driving at this point is not recommended…

Hey, while I’m sitting around here doing nothing, I could always start building the 1239-Cc3… Hmmmmmmm…

Someday I must give up this mad carefree existence…

Rick

[clarkfan]

As alluded to in another thread, once I got the completed 1237-Cc3 built, and could fiddle with it and the 1237-Cc2 on some test blocks, pushing, poking, prodding, I jumped right into the build of the 1238-Cc3.

To reiterate for everyone, and especially those confused by all this blathering rigmarole I put up here, the major design difference between the 1238-Cc3 and its predecessor 1237-Cc3 chassis is the incorporation of Indirect Main Rails (IMR, for short), which in some parlance are referred to as “Z-rails”. However, in the 1238 design the IMR’s would be more correctly called “V-rails”. The center “main rail” for the 1238 extends from the forward central angle of the rear motor/axle assembly only to the guide tongue mount (Center-Guide section, or CG, for short). The medial portion of the IMR’s attach to the forward sides of the CG section, extending rearward; each lateral portion of the IMR’s attach to the rear of each adjacent medial portion and extend forward to attach to the front spanning wire (Front Spanner, or FS, which is a four wire assembly now). So, I guess if you wanted to, you could describe these as “VIV rails”…

The other big change from the 1237 to the 1238 is the elimination of the dynamic pans between the Buttress rails and the CG section, or IMR’s in the case of the 1238. Though I was pretty sure this would put the 1238 as an RTR car well under that 100-gram number thing, it had to be done, as the dynamic pans would be eliminated on the next chassis, the 1239, anyway, and it made more sense for comparison purposes to eliminate them at this step in the design progression.

So, the 1238-Cc3 came out like this:












While the 1238 is a bit chunkier in the middle from the IMR’s, as thought, the RTR car for the 1238-Cc3 came out to 93.6 grams, even lighter than the 1237-Cc3 (95.2 grams), which was well below the original 1237-Cc2 (102.2 grams). This also puts it well below that 100-gram number thing, but as noted elsewhere, this doesn’t matter when comparing the design/structural differences between the chassis in the progression. I can always consider the 100-g thing at a later time…

Speaking of a later time, the original plan was to take the 1237-Cc3 and 1238-Cc3 over to Fast Eddie’s Raceway this week for some test runs… At least, that was the plan, until I screwed up my back something serious working at the hospital last Friday night… had to go to the ER… So, instead of doing what I’d planned this week, I’m sitting around the domicile chunkin’ down pain meds, and trying not to do anything strenuous… like lugging a bunch of slot car stuff to the raceway… in fact, driving at this point is not recommended…

Hey, while I’m sitting around here doing nothing, I could always start building the 1239-Cc3… Hmmmmmmm…

Someday I must give up this mad carefree existence…

Rick

iS THERE A STEP BY STEP GUIDE AVAILABLE, I WOULD TO TRY TO MAKE A 1/32 VERSION

CRAIG

[CMF3]

Hey Craig. Sorry for the slow response; been doing non-slot car life stuff... if they'd only pay me to play with toy cars...

I have not compiled a step-by-step build sequence for any of the 1237-series chassis, sorry. They're all pretty new (compared to the older 1219-series which had progressed for years), so to me they're still open to "fine tuning" in the lay-out and building process. But it is on the O-2-It list.

Rick / CMF3