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Member postings for GordonH

Here is a list of all the postings GordonH has made in our forums. Click on a thread name to jump to the thread.

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Thread: Not a new member, but I rarely post!
22/01/2019 20:46:18
Maybe a little earlier Neil, I'm already thinking of starting another thread in a month or so.
Gordon
22/01/2019 11:34:00
NDIY,
Thanks, it was September 2018, so fairly recent.
22/01/2019 09:34:53
Hi, I've hung around this site for years, but only made one other post so far. My main modeling interests are steam engines and machine tools.
I have various ongoing projects including a Stuart 10V, gauge one and a 3 1/2 inch Conway locomotives. I'm also renovating a Sigma Jones jig borer and thinking of using this to experiment with CNC Control.
Thread: Efficiency - how measured, exactly ?
30/09/2018 12:31:32
Tim,
I am a member of the BSME who organised and ran this year's IMLEC, and I also acted as one the official observers.
Prior the competion run, the drivers choose the quantity and grade (size) of coal that will be required and the number of passengers that they wish to pull during the test run. The chosen number of passenger tickets and the amount of coal, pre-weighed and bagged is then collect and verified. In the Steaming Bay, charcoal is supplied for steaming the engine. At the start of the competition run, the engine is taken to the traverser, for transfer to the running track. At the traverser, the driver must stop adding charcoal and begin to use his coal supply Once on the running track, the dynamometer car (loaned by Leyland SME) is connected and calibrated, together with the chosen number of passenger trucks. The train is then driven to the station where the selected passengers board and the test run begins.
At the start of the test run, the timekeeper starts the clock and begins the lap count. Each run must be for a minimum of 25 minutes. After this time, the the driver may stop or carry on. After 30 minutes,the driver must not begin another lap but if part way around is able to complete the lap.
At the end of the run, the unused coal (any coal which has not entered the firebox) is weighed. The difference between the starting and finishing weights is then used in the efficiency calculation. No allowance is made for any energy remaining in the firebox, or for coal which may have passed through the firebox without being burned. The former is down to the skill of the driver, the latter is part of the engines efficiency. In practice, many drivers finished with no fire in the firebox, and little residual boiler pressure. This was down to the driver judging when to stop coaling.
The overall efficiency is calculated from the speed and load data from the dynamometer, the distance travelled and the overall time , the amount of coal used and the calorific value of the coal. This calculation wash previously discussed in a thread on this forum be David Clark in January 2012.
https://www.model-engineer.co.uk/forums/postings.asp?th=64687
Gordon Halliburton
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