My first time to Boomilever. I have 3 questions.
1. I was going thru the scoring sheet and 6d in the sheet says "Clearance from Contact Depth Line (in cm to the closest 0.1cm)" what is this and how is this measured?
2. If I plan to have 2 holes in my base, how apart should they be? Any idea?
3. When I see the pictures of different boomilevers, I see different kinds of loading blocks. So Am I expected to go with my own loading blocks or the respective contests will have the loading blocks in the size of 5x5x2?
A couple quick additional thoughts/things to consider.
1) Since scoring is on efficiency- you want the lightest structure that can carry the load - you don't want extra wood that is doing nothing structural. Having something at the bolts- a piece that you can attach your tension members to is necessary. But wood in between the holes does nothing (but add weight, and lower your score). So think about one piece at each of two bolts - something that the bolt goes through, and holds in place, and that provides something to glue/attach the tension members to. This joint, as you will find- as a beginner -is a challenge; there is a lot of force on it.
2) Take the time to read through the message threads here in the boom section- go back to the beginning, read through, follow links provided, look at the photo gallery; the study portion of this building event. Understand how the forces in a boom work, and the options you have for controlling/mastering them.
3) regarding the contact depth line. Where it is is the distance below the line of bolt holes provided in the wall on which you hang your boom (for B-division, 20cm below)- it's a line parallel to the bolt hole line. What it is is the line below which your boom cannot touch the wall. As you will see when you do your homework, you want where the compression member(s) of your boom touch the wall to be very close to that line- you want as much height/distance between the top attachment to the bolts, and the bottom contact of the boom arm with the wall as you can. The shorter that distance is, the more the forces on the members of the boom. So you want a design/layout that gets you close to that line