G'day all I have been busy over the summer with a wedding in Thailand and some house maintenance to do but I am back in the layout room and starting the helix planning and construction. While my wife and daughter were in Thailand for an extra month I took the opportunity to chase some trains.
The helix will be double track with an outside diameter of 120cm and will rise about 75mm per turn which will give it a grade of just over 2.1% or so the web sites that have grade calculators tell me. I would like to thank all the people who have posted helix
charts and designs online you don't have to do it but I has helped me a lot and I am sure that many other modelers have applied what they have studied on your posts. I have been a member of a club where the most common skill was the keeping of knowledge lest somebody do it better than you.
glue the sections together over lapping so there is no need to add joints. Why MDF ?, only one reason it is cheap $20 for a 2400 x 1200 sheet. I will paint it to keep out the moisture to prevent sagging.