With the announcement of protea prime I finally figured it was time to work on getting the base Warframe for my Helmith. However after a couple of hours in the extended granum void I feel that something may be... off.
The loot tables found on https://www.warframe.com/droptables#extendedgranumvoid shows the protea chassis as having a 11.11% drop rate.
I have personally ran 35 runes resulting in
12 Stropha Receivers
9 Stahlta Stocks
14 Velox Receivers
I was running it with a friend and he has had 49 runs without receiving a chassis himself.
I'll attach images of both our inventories, while I know it's RNG at the end of the day probability math suggest that we should have received it by now.