arfaminit Posted November 8, 2014 Share Posted November 8, 2014 How do I assess whether my 30 yr.old 125 Intercity [diesel] engine is going quick enough ~ it appears very roughly half the speed of my King Henry V1 ? At least it doesn't keep de-railing though [unlike the King on standard Hornby points] Link to post Share on other sites More sharing options...
Dave Scott Posted November 8, 2014 Share Posted November 8, 2014 Have you checked the back to back of the wheels. I use a gauge from the Double O Gauge Association and often find Hornbt b-b variable Link to post Share on other sites More sharing options...
arfaminit Posted November 8, 2014 Author Share Posted November 8, 2014 Have you checked the back to back of the wheels. I use a gauge from the Double O Gauge Association and often find Hornbt b-b variable cheers dave thanks for reply but I'm not sure what you mean Link to post Share on other sites More sharing options...
Stevelewis Posted November 8, 2014 Share Posted November 8, 2014 Back to Back----- the distance between the inner surfaces of the wheels! (ie the measurement of the distance between the backs of a pair of wheels on 1 axle) Link to post Share on other sites More sharing options...
Dave Scott Posted November 8, 2014 Share Posted November 8, 2014 Back to Back----- the distance between the inner surfaces of the wheels! (ie the measurement of the distance between the backs of a pair of wheels on 1 axle) On a lot of old track plans the words "the accuracy of this measurement cannot be overestimated". At the crossing there are check rails to ensure the wheels follow the corect path. On RTR points this distance is fixed. If the wheel back to back is too tight the wheel will ride up the check rails and derail. If too wide the outside check rail wont stop the wheeL going the wrong way at the crossing V and again derail. You need to check all the wheels including the bogie and tender Link to post Share on other sites More sharing options...
Titan Posted November 8, 2014 Share Posted November 8, 2014 How do I assess whether my 30 yr.old 125 Intercity [diesel] engine is going quick enough ~ it appears very roughly half the speed of my King Henry V1 ? At least it doesn't keep de-railing though [unlike the King on standard Hornby points] If your IC 125 is going about half the speed of your King, there is a good chance it is going too slowly, The Hornby Ringfield is quite capable of exceeding scale speed by a fair margin. If you want to be sure you can measure the length of your circuit and time how long it takes to do say ten circuits. Then just a little number crunching to get scale speed. Link to post Share on other sites More sharing options...
hoovered Posted November 8, 2014 Share Posted November 8, 2014 Our Hornby 125 was not very fast and did not pull very well until we added some weight to the power car. now it goes like a good un . :} Link to post Share on other sites More sharing options...
Cornish Triang Paul Posted November 9, 2014 Share Posted November 9, 2014 My 77 set goes fast enough to topple over !! Has extra weight and pulls fine. Link to post Share on other sites More sharing options...
arfaminit Posted November 9, 2014 Author Share Posted November 9, 2014 How do I assess whether my 30 yr.old 125 Intercity [diesel] engine is going quick enough ~ it appears very roughly half the speed of my King Henry V1 ? At least it doesn't keep de-railing though [unlike the King on standard Hornby points] Thanks everybody for your replies. I now seem to have found the problem. One of the main engine cogs had fractionally lifted off its hub. Having corrected this, it's now running smoother and quicker although not quite as quick as the King. But it doesn't derail like the King Link to post Share on other sites More sharing options...
knapper Posted November 11, 2014 Share Posted November 11, 2014 How do I assess whether my 30 yr.old 125 Intercity [diesel] engine is going quick enough I've put together a little tool that you may find useful; http://www.entwinesolutions.co.uk/scalespeed/ Happily works on smart phones, tablets, laptops and desktops. Link to post Share on other sites More sharing options...
Titan Posted November 11, 2014 Share Posted November 11, 2014 Our Hornby 125 was not very fast and did not pull very well until we added some weight to the power car. now it goes like a good un . :} I guess I must be lucky with mine, no extra weight and it hauls/propels five trailers + dummy at high speed no problem. Link to post Share on other sites More sharing options...
10000 Posted November 11, 2014 Share Posted November 11, 2014 In my experience the most likely cause of the king derailing is that the wheels on the front bogie are too close. Link to post Share on other sites More sharing options...
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