7.5g,
50cm,
17mm tapering to 9mm
Semi solid xps core 5mm tube channel
1lay GF 50g + 1cf tow 12K spread apart + 1lay GF 50g
I start with a 4x4cm foam piece. I drill the tubular channel into the foam piece with my drill and a CF arrow shaft. This is done inch by inch since you have to unclog the channel from foam pieces cut and squeezed by the arrow shaft as it drills.
When this is done I have a 4x4x50cm piece with a tubular channel morphed into the piece. The arrow shaft serves multiple purposes. it keeps the piece straight and strong so you could work around glassing it and rapping it and it gives access to your wiring and saves 0.5g.
Then I go over to the hot wire bench. With the arrow shaft fitted into the channel, I fit two washers at the end of the piece, one of 1cm diameter and one of 1.7-2cm diameter. The washers serve as a guide for the hot wire to cut into a perfect tapered boom!
Then it's glass time, I cut the 50g cloth in one piece that will wrap 2times around the foam boom. I lightly spray the boom with glue and place it over the cloth for a full rotation. I then pause, lay down the CF hairs on the remaining cloth, hanging from the boom, and wrap the remaining cloth with the CF strings around the boom.
So I have 2layers of GF which have sandwiched CF strips.
I secure the cloth in place with a plain string with a few wraps along the boom. Then I mix epoxy and roll it onto the boom for a good soak. I drain with toilet paper the excess epoxy and wrap the whole thing with straps of PP sheets tightly until it cures.
Sound a bit too complicated, but actually, it's not! I took me about 1-2 hours to complete.
