Lockdown Experiments

I'm still doing bits of work on this project. I now have 4 of the HF sections made, they all have different amounts of curve on the front face, not really noticeable on the photo.





I also got around to tidying up the grp mid horn prototype and made a new silicon mould from it, ready for making the curved face versions which will be needed in the next box attempt.

awsome, wish I could do this kind of fabrication.

I tried the new mould out. First attempt involved brushing gelcoat onto it on all the surfaces, then coating with a resin and silica mix. This was very tricky to do due to lack of access to the inside, despite the large hole in the baffle.





The first attempt wasn't successful, I had missed a few bits and there were quite a few holes. I forced the mould back into it and tried a new approach, laying up a couple of layers of resin and mat on the outside, taking care to get baffle end and mouth end sealed.





Next I propped it up so the baffle was horizontal and poured resin in through the big hole in the baffle. This was successful, and the whole thing now feels very solid.

I refined the technique for the next attempt. Gelcoat brushed onto the outside surfaces, a layer of woven glass cloth is wetted out with resin then applied around both sides of the horn, going out a bit further to make mounting flanges to the sides, then a couple of mat layers. I the pour coloured resin in through the big hole, done in 3 stages to prevent overheating and cracking of the resin, pulled the mould out when it is all cured.





Here's where I'm up to now

Proper job.

Wow.