Цитата Сообщение от Laurent
Цитата Сообщение от Jean-Philippe
Laurent please do not laugh at me! :oops:
I'm not laughing at you at all, Jean-Philippe. And I'm pretty sure that the PFMs with a fixed windscreen all had the SPS installed.
I think you should try to find the drawings made by Владимир Климов. I suppose that these drawings appeared first in the booklet: Ефим Гордон и Владимир Климов, МиГ-21 часть I, Приложение к журналу "Крылья Родины" №1 1994. Now you can find the drawings in the MiG-21 Aerofax book and the Famous Aircraft of the World MiG-21 Burindo book.
Assuming that these drawings are correct, PFMs with no SPS and a single-part canopy existed.
Now we just have to wait for Russian members answers...

You said you are pretty sure but not totally sure, and I'm very suspicious about drawings.
Remenber how "accurate" were the Russian aircraft drawings 20 years ago, those drawn by western designers.
I'm sure there are now Russian specialists with new informations and datas.