Hi, I know this is a old thread, but since I found it through Google after watching Bill Mollison speak about Trompes, I thought to post here that I hope to collect information about trumps and give people ideas on what they can achieve if they intent to build one.
I just started and so far there is not much more as is listed here. But if you have comments or things to add, please do. The address is
https://trompeuniversity.blogspot.com/ (Pun intended)
Hope to get ideas and of course to help people who are looking for information.
Next steps are to post what someone can achief with a smaller Trompe and to show how I build a scale model.
Hope it helps someone looking for info.