[Milsurplus] ARC 27 and dynamotor

[CL in NC]

I worked on the ARC 27 many years ago, and always wondered how well the plenum chamber cover transferred the heat from inside to outside.  They did get pretty warm inside that sealed box.   There was a little dinky fan inside the unit to circulate the hot air, with  a dual squirrel cage blower for the plenum on the outside.  There was one installation called the 'biscuit' because it was round and flat, that had a 27 out of its cabinet and installed in the open, along with several other pieces of gear, but the whole biscuit was in a pressurized compartment and designed to be a change out item to expedite air craft turnaround.  I have forgotten the aircraft it went in, perhaps an S2F.

Charlie, W4MEC in NC