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The photos and video below show an ERTL tractor trailer I converted to 'Streets today.  It runs very smoothly from a scale 15 mph up to faster than I want to try, and climbs 12% slopes with ease.  It might actually handle D21 curves (have not tried) but it has no problem with the "D30" curves on my country road.  And how ironic that my first satisfactory 'Streets tractor trailer is a Whole Foods truck - our household doesn't seem to be able to survive without a trip there at least once a day.

 

My wife laughed when I said this conversion is amazingly simple to do. She said I spent three years and countless failed experiments finding out how to do it right: but that is the point, once you find out what works and what doesn't, you can reduce it to the right simple steps, and it is easy and quick: this took four hours start to finish.   I explain how at the end.  The only thing left to do is to bolt the trailerbody onto the trailer chassis - I left it loose this afternoon in case I had to adjust gears or something but it ran perfectly forever.  I may be a tiny bit crooked inthe video.

I'm having serious computer problems and have not been able to view the video I'm posted on my computer, so I am loading it direct from the camera and hope it is good.  It's running at a scale 75 mph, I'll probably run it usually at a scale 50 or so.

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What I have learned: my "formula" for very satsifactory tractor trailers.

  • drive the front axle of the trailer (by which i mean the front of the two in the rear of an 18-wheeler;s trailer, or in this case, the only one)
  • use a monstrous can motor with a big flywheel - the biggest you can find.  Keep in as low as you can: a high center of gravity can kill good performance
  • use diecast vehicles and all the weight you can - traction is the key, and weight gives that.  The big motor can move the weight, no problem.
  • with a big, big motor, you don't need a gearbox for good slow speed running. Big can motors run at about 40% of the RPM of the tiny motors in 'Streets vehciles, so just using the big motor affects a 2.5:1 change in gear ratio, and they can loaf at low speeds and stillprovide all the torque the vehicle needs.
  • with the big flywheel, perfect electrical connectivity is not needed (it rides through even one-second lapes in power without noticeable slowing) so you don't need to pickup power from all axles (I had built 18-wheelers with five center pickups and pickup for all five axles, a real pain requiring lots of time. This tractor trailer picks up power from the four rearmost wheels (two of which are traction tires with less than perfect connectivity) and has only one center pickup. It runs quite well in spite.
  • Note again I converted the ERTL tractor un modified except for changing the front axle/wheels to a 'Streets axle and bolted the front inch of a WBB Ford van 'Streets chassis to the rear - in the exact spot the ERTL rear axle went.

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"75mph"...somebody's been messing with the engines govenor!...what's the posted speed limit on that stretch of tarmac and where's a cop when ya need one!{really- a police car with the lights on right behind him would be funny}

 

Neat build Lee... I have to look up your D30 conversion

 

Funny thing too, I vaguely remember someone saying that we should try something new once...it might just work...or something along those lines- he'd be proud of you.  

Originally Posted by Dennis:

Lee, can you run "traffic"?  I'd like to see a video of all your vehicles running at the same time.

.....

Dennis

Dennis - I guess it depends what you mean by traffic.

 

I will answer your question and provide a lot of other info since I have had several e-mails with detailed questions. 

 

If traffic means no more than ten or eleven at once then, yes, I can do "traffic":

 

I have six 'Streets loops, all two-lane streets/roads with a 'Streets lane each direction, and blended into city streets (gutters and sidewalks) or country road (gravel shoulders) and the  landscapes.  Each loops has its separate power supply.

  • Four so short - 8 to 14 ft around, that I can run only one vehicle at a time: so that's four vehicles. 
  • My downtown Main St loop  is 48 feet around and even though it has no isolation blocks/relaying to stop vehicles bunching together, I routinely run two or three city buses, etc., at one time.   The big-motor/reduction-geared drivetrains I use on my city streets run at nearly identical speeds at any voltage, so if I space two buses at equal distances it takes about forty minutes for the faster to catch the slower. I often run two buses and a delivery truck on it.  So that is three more.
  • I built my country road with provision for two relay-able isolation blocks that would hold up traffic so it won't bunch up, but currently run it as one electrical loop.  But it's 85 feet around, and so far the only two of the new drivetrains I have built to run on it (Greyhound bus, the Ertl Whole Foods tractor trailer I posted yesterday) run at nearly identical speeds - I imagine I will be able to put three buses or tractor trailers at a time on this road for a good half hour before anybody meets anyone, maybe four.  So say that is four.

Four plus three plus four: I can run eleven vehicles at once.  I plan to and to take videos once I get the whole country road and my tractor trailers made and sorted out.

 

As to the traffic, this is a quick inventory of the vehicles I currently have:

  • About two-dozen NIB stock 'Streets vehicle of various types/manufacturers, for parts/bashing.  By far, the best vehicle to bash is the new WBB Van.  The rest are basically there to harvest wheels & axles only, etc. (only the vintage truck has wheels that are "car" size, etc. 
  • On all vehicles I run - I remove the rectifier and run them on DC, so they will back up on reverse polarity.  The only exceptions are my first-year issue, metal chassis K-Line vans, which have F-N-R e-units that will run on AC or DC.  These retain their rectifier.
  • I have about eight otherwise stock vehicles - one of each type from the all-metal chassis early K-line ones through to the current WBB Vans, etc. 
  • I have about twenty bashed vehicles with stock drivetrains but bashed bodies or new 1:43 car or light truck bodies grafted on them.
  • None of the stock or stock drivetrain vehicles above is really satisfactory: stock 'streets vehicles run smoothly only at speeds higher than I want to run them.  Theire tiny size, limited number of wheels (only four tiny ones, one a traction tire) and cheesy center pickups (Lionel ones anyway) mean they get marginal electrical connectivity and with small motors with no flywheels, they tend to stutter and stall at low speeds.  If them just had a flywheel . . .
  • I have numerous experimental buses, trucks, and tractor trailers with all manner of attempts at various types of different designs and drive trains, none of which is satisfactory.  These were successes as ways to learn what does or does not work, but none is completely satisifactory and a few are disasterous failures.  I don;'t run any of these.
  • I have three buses and a delivery truck with oversize flywheel motors (which alone gives about a 2:1 reduction in running speed because it turns slower) and 3:1 reduction gearing, that are entirely satisfactory in city streets - running smoothly and dependable at "downtown speeds of 8 - 15 mph. This is a final design I don't think I can improve.
  • I have completed only two countyr-road drive trains (Greyhound bus, Ertl Whole Foods tractor-trailer) but these are entirely satisfactory for that use the big flywheel motor but no reduction gearing, and that are entirely satisfactory at country speeds of 25-75 mph.  I plan two more buses (Corgi Trailways and Lionel Lines) wmr a full size Bartoletti race car transporter (basically those were converted cross-country buses), and about half a dozen tractor trailers all with this drive train. This is a final design I don't think I can improve.
  • I plan a set of floats for a Thanksgiving Da/Christmas season opening parade through downtown, with double reduction gearing (9:1) for very slow speed. 

When I get further along I will post a video of everything running: three trains, a boat on lake, and eleven vehciles - movement everywhere!

Last edited by Lee Willis
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