HOn3 curve radius

Discussion in 'Logging, Mining and Industrial Railroads' started by Glen Haasdyk, Mar 23, 2004.

  1. Glen Haasdyk

    Glen Haasdyk Active Member

    Hi, I'm new to narrow guage. I've been collecting some equipment for awhile now and now I'm wanting to build a small logging branchline on my layout. What is the smallest raduis curve I can use in HOn3 I'm most likly going to use an 0-8-0T from MDC that I'm going to power. I filed the # 2 and 3 drivers in each side blind so it'll go around a tight corner. Question number two is how tight of a curve will the MDc HOn3 two-truck-shay manage? I don't have one yet but might look for one down the road. Thanks for the help.
  2. neilmunck

    neilmunck Member

    The shay can definately go round 18" radius curves but tighter than that and the telescopic drive shafts on the right side might come out too far and fall appart or not be able to close up enough on the inside of the bend and jam.

    So.....18" is fine (I've tried it) but it all gets very tight at less than that. There wasn't much extra travel left on the drive shafts on my one at 18".

    Hope that helps,
  3. Glen Haasdyk

    Glen Haasdyk Active Member

    Thanks, but I think I might be looking for a tighter curve. That's why I'm working with that MDC 0-8-0t kit. It comes unpowered but it has the frame and drivers off their inside frame 2-8-0 engine so I figure I can just add the drivetrain from MDC down the road. So I'm trying for a really tight radius curve due to space constrictions. I'm also scratchbuilding an HOn3 climax for the planed area.
  4. shamus

    shamus Registered Member

    Hello Glen,
    When you say H0n3 I presume you are talking N-scale trackwork as the n stands for narrow gauge and the 3 for 3 foot, yes. In that case, you should be able to go down below 18" radius if you are using n-scale chassis's with H0n3 bodies. Same applies to me, I model 0n30 which is 0-gauge narrowgauge at 30" track width. most of my chassis's are HO with 0n30 gauge bodies on them.

    I have 18" radius curves on my 0n30

    Its real fun sometimes, as you can make what ever little critter you want.
  5. cidchase

    cidchase Active Member

    Hi Glen,
    You could get 2 or three lengths of HOn3 flex track
    and tack down a test loop; then you could experiment
    to see how tight to go. That's my plan, anyhoo.

    I'm planning on a 15" radius using an HOn3 2-truck
    Shay, but I have not tested it yet. Got the loco but no
    track. I would be interested in your results!!:D :D
  6. Glen Haasdyk

    Glen Haasdyk Active Member


    HOn3 runs on different track that 'N' scale. HOn30 is the guage that uses 'n' scale. It works out to 30 inches or around 2 1/2 feet between the rails. I'd almost consider going the HOn30 route but I've already collected servral pieces of equipment and don't want to give them up.
  7. sumpter250

    sumpter250 multiscale modelbuilder

    If that's the "Battle Mountain" outside frame 0-8-0T from MDC, it will probably not like much smaller that 18" radius, and I wouldn't try less that 15".
  8. RailRon

    RailRon Active Member

    I'll use 16" (40 cm) minimum radius on my H0n3 line.

    So far I tested it with flex track and the MDC outside frame 2-8-0 and this works. But I wouldn't use a tighter radius.

    BTW: The track gauge of H0n3 is 10.5 mm and on H0n30 it is 9 mm (N).

  9. 60103

    60103 Pooh Bah

    One point to be aware of is that the effective radius of a given number of turnout is different in HO and HOn3. It's probably proportional to the track gauge.
  10. Glen Haasdyk

    Glen Haasdyk Active Member

    Thanks for the help so far. I am planning on using #4 turnouts so I think I'll extrapolate from those

Share This Page