ahh.. the dreaded "shock cooling" problem for tow planes..
we have operated tow planes in the desert for 18 years with out a engine
problem that could be contributed to "shock cooling"... I agree, power
reduction and cooling of the engine is best for engine life... full power
climbs and "reduced" not idle power descents.. people worry about shock
cooling and then they slip it for 2000ft altitude loss to get down, totally
disturbing the airflow through the engine..

more important is proper leaning procedures during full power climbs and let
down procedures that don't stress the engine and foul the spark plugs..

BT

"dhaluza" wrote in message
oups.com...
Anyone interested in doing additional research on towplane engine
thermal stress may be interested in this 4 channel 24 bit USB
thermocouple datalogger for ony $395:

http://sine.ni.com/nips/cds/view/p/lang/en/nid/13880

It does need a host computer, so you would have to connect it to a
laptop PC. With it you could monitor CHT and EGT thermocouples with
very high precision.

I don't have any commercial interest in this, just ran across it and
thought I would pass it along.