I have built another units of SIAP Solar Cooker. It is an improvement from SIAPv5.0 and therefore it is named SIAPv5.2. I tested it over the past two weekends and currently with some improvements made, SIAPv5.2 could achieve 115C.
I am going to test SIAPv5.2 further after I have made some further improvements this week. I trust that it could achieve higher temperature.
This is the unit that I will present to the potential sponsor of this project. Hopefully, it could impress him and get the necessary funds for me to proceed with further Solar activities.