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Test Run 4415

Posted on 7 November 20207 November 2020

Since our last meet up, the Moel Rhos has taken delivery of the parts for a Kerr Stuart 4415-type, designed and manufactured at the RVM workshops and now being assembled by Moel Rhos’ engineering department, who try to make up with in enthusiasm what they lack in ability.

Here is the chassis out on a test run. It is a chain driven 6WD but we think one or more of the chains are slipping. Once it has run in a bit, the engineering dept. will attempt to remove one more link from each to tighten them up and prevent the chain coming off or any slippage.

7 thoughts on “Test Run 4415”

  1. Mike Barton says:
    7 November 2020 at 6:33 pm

    Are the chains the Delrin type? I had trouble with these with one of my power bogies on the green railbus and found them quite tricky to adjust to a nice fit. Better to have them slightly loose rather than too tight though. Or possibly one of the chain gears is slipping on its axle – I think they are mostly a friction fit?

    Reply
    1. Simon Wood says:
      8 November 2020 at 9:45 am

      Here’s a pic showing the chains.

      Reply
  2. Trevor says:
    7 November 2020 at 8:05 pm

    No Mike it is metal chain. The chain wheels are friction fitted but they are pretty tight on the axles. The chain is a bit sloppy until it has freed itself up after some running. The prototype runs really well now the chains have been tightened. One of the initial problems I had with it was that slack chain was picking up rubbish from the track which was getting into the mechanism. It is OK now the chain is tight enough to keep it off the track.

    Reply
    1. Simon Wood says:
      8 November 2020 at 9:48 am

      Ah, that’s interesting! I think a number of my chain derailments have been caused by the chain picking something up and the detritus pushing the chains off their wheels and so causing everything to lock up. Glad to hear that will be alleviated by tightening.

      Besides that issue the chassis is quite capable of completing a full circuit so there is definitely no issue with the 38″ radius curves.

      Reply
  3. Trevor Thompson says:
    7 November 2020 at 8:06 pm

    Oh and well done Simon! Progress is being made.

    Reply
  4. Mike Barton says:
    8 November 2020 at 10:21 am

    That all looks quite robust compared to Delrin, which I always think may be about to break when I’m fitting it!

    Reply
  5. Gary Jones says:
    8 November 2020 at 11:35 am

    Interesting drive system .

    Reply

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