The Eureka Times - 3rd Edition
The Design Drawing Phase
The first set of full drawings for the 620/720 rail motors have arrived, been checked and returned to the manufacturers for modification. As would be expected there are some changes which we want to have carried out but the overall accuracy and level of detail shown on the drawings is extremely high and none of the proposed modifications relate to the accuracy of the dimensions on the unit. One of the participants in the checking process has spent most of his working life with State Rail (and its predecessors) working on rail motors. He was able to go from one end of a car to the other identifying as he went the individual under floor detail items of the prototype all now represented on the drawings. The 720 car has interior detailing to a similar high level and the 620 has interior detailing along the windows allowing for the motor, drive-shafts, speakers and gear towers which are primarily located down the centre of the car. Directional lighting is also being provided.
The full drawings for the AD60 are not due for another six weeks but we are starting to see some drawings when design questions need to be being sorted out. Here is a sample of the preliminary drawings.
The original drawings, which have been considerably reduced in size to fit on the web page, show a very high level of detail, which when reproduced in plastic and metal should make a very fine model indeed.
Once the checking process is complete the drawings can be signed off and the tooling process can start.
Both the 620/720s and the AD60 are on schedule at this stage.
With the 1st set of drawings for the 620/720 rail motors now complete we have received many 3D images, including this one.
The most frequently asked question regarding the Garratt still concerns the minimum radius that the model will negotiate.
In the last edition of The Eureka Times we indicated that this was one of the issues to be determined in the design phase. The drawings mentioned above relate to the minimum radius and we have approved a minor departure from the prototype's dimensions which the manufacturer indicates will allow the model to traverse 18 inch radius curves. This is below the 24 inch minimum that I had stated to the manufacturer as being acceptable but as mentioned in the last edition I felt all along that the manufacturer was aiming for less than 24 inches so it looks like an 18 inch minimum radius it will be.
Just prior to the Liverpool exhibition the details of the sound option for the Garratt were finalised with the QSI Corporation in the US. QSI is the main supplier of sound systems in the US and is known for its work with the Brooklyn Limited Import group who supply a range of QSI sound equipped locomotives for the US market.
QSI will be supplying the sound system for the AD60 with the chips being factory installed in China. The QSI system allows for the operation of sound in both conventional DC and DCC mode. The chip senses what current is present on the track and responds accordingly. The sound in the chip will be genuine Garratt sound burned into the chip including the distinct Garratt whistle which of course will be separately controllable.
As indicated elsewhere sound will be available as an optional extra at a cost of $90.
Provision is being made for at least two different set numbers in each of the colour schemes of the railmotors. The only decision so far on numbers is that 628/728 will be one of the sets done in Tuscan Red. The Garratt will have at least two model numbers in addition to the four already announced. We intend to conduct a poll early next year amongst all those who have ordered models to determine what is the most favoured numbers. The post popular numbers in each category will be the ones that we do.
We are getting plenty of feedback and comments mostly by email which we appreciate very much. I try to answer all emails as quickly as possible but inevitable some replies are delayed. My apologies for this but there are only so many hours in each day so hang on and you will get an answer.