Producing a new US style loco in TT scale

Re: Producing a new US style loco in TT scale

Postby Zs12 » Wed Feb 04, 2015 12:12 pm

Tillig's BR 186 and 189 should have the perfect axle spacing for a FA2, but they're not cheap - see drehgestellbaukasten on tt-board.de :arrow:
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Re: Producing a new US style loco in TT scale

Postby MacG » Wed Feb 04, 2015 2:48 pm

At this table is missing the measured distance. There is only the calculated distance in scale. For the Alco FA we have used the BR218 "Start".
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Re: Producing a new US style loco in TT scale

Postby Zs12 » Wed Feb 04, 2015 4:49 pm

Unfortunately the axle spacing of this model family is noticeably too short.
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Re: Producing a new US style loco in TT scale

Postby MacG » Wed Feb 04, 2015 5:15 pm

Maybe. I find it good so.

CIMG3211.JPG
Alco FA with Tillig BR218 "Start" chassis
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Re: Producing a new US style loco in TT scale

Postby ConducTTor » Wed Feb 04, 2015 10:52 pm

I haven't worked on my FA/FBs in a long time but I am using the BR 218 chassis as well. And I believe Arseny did the same thing.
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Re: Producing a new US style loco in TT scale

Postby Richard-B » Wed Feb 04, 2015 11:42 pm

this table is missing the measured distance. There is only the calculated distance in scale.
Ok:
Common US Diesel truck wheelbases:

4-axle:
AAR type "A" trucks - Wheelbase 8'-00" (TT = 0.80in , 20.32mm)
AAR type "B" trucks - Wheelbase 9'-04" with GE traction motors (TT = 0.933in, 23.71mm)
AAR type "B" trucks - Wheelbase 9'-10" with Westinghouse traction motors. (TT = 0.983in, 24,98mm)
BLOMBERG type "B" - Wheelbase 9'-00" (TT = 0.90in , 22.86mm)
BLOMBERG type "M" - Wheelbase 9'-00" (TT = 0.90in , 22.86mm)

6-axle:
FLEXICOIL "C" truck - Wheelbase 13'-07" (6'-09 1/2" and 6'-09 1/2") (TT = 1.36in, 34.5mm or 2x 0.68in, 17.25mm)
HTC TRUCKS - Wheelbase of 13'-08" (TT = 1.37in, 34.71mm)
EMD A-1-A passenger trucks - Wheelbase 14'-01" (TT = 1.41in, 35.77mm)

...distilled and computed from: http://www.hosam.com/emd/ewhb.html
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Re: Producing a new US style loco in TT scale

Postby Richard-B » Wed Feb 04, 2015 11:54 pm

ConducTTor wrote:I haven't worked on my FA/FBs in a long time but I am using the BR 218 chassis as well.
So...
What is the axle spacing on the BR 218:
  • Prototype?
  • Model?

{{Corrected Info}}
Ref: http://www.hosam.com/alco/frt.html
The FA1 prototype has a truck-to-truck wheelbase of 27'-02" (TT = 2.72in , 69.0mm)
How does the TT-scale BR 218 compare?
Last edited by Richard-B on Thu Feb 05, 2015 11:41 am, edited 1 time in total.
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Re: Producing a new US style loco in TT scale

Postby ConducTTor » Thu Feb 05, 2015 12:33 am

Richard here is the comparison. The Alco dimensions are from your dieselshop link, the BR 218 are from tt-board here: http://www.tt-board.de/forum/showthread.php?t=11544

Distance between Truck Centers: 27'-02" (TT = 2.72", 69mm). Tillig BR 218 = 71.8mm.
Wheelbase: 9'-04" (TT = 0.93", 23.7mm). Tillig BR 218 = 23.1mm.
Wheel Dia: 40" (TT = 0.33", 8.46mm). Tillig BR 218 = 8.3mm.

As you can see, it's not an EXACT fit. But, given the "out of the box almost RTR kit" nature of the pairing, it can't be beat.
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Re: Producing a new US style loco in TT scale

Postby Zs12 » Thu Feb 05, 2015 6:16 am

I found 29'-2" (1:120 = 74.08 mm) as Distance between Truck Centers? Is it possible to lengthen the BR 218 underframe?
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Re: Producing a new US style loco in TT scale

Postby scaro » Thu Feb 05, 2015 6:18 am

Would probably be a good fit for an FT, which is 27'3" wheelbase. If there were a shell.
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