The JPEG is about 2 minutes of engine monitor data (from a 1 hour
log). I'd post the entire Excel spreadsheet itself but 6 meg is way
too much for up/download. The X axis is in Time (seconds) and Y is the
value. Note that some of the parameters (like rpm and fuel flow) are
scaled so they fit the Y scale of the chart
A few details about flight conditions so the data can be placed in
context. The chart starts with the plane at minimum power for
level flight (MPLF) at around 1500 ft with all temperatures and pressures
stabilized. The throttle is opened to max (notice that fuel flow
goes from 3 gph to ~18 gph) and the airspeed climbs to ~150 mph. The
plane was then pitched up into a climb at Vx to see worst case cooling
conditions. WOT is maintained for about 1 minute then reduced to MPLF
again.
Most of the chart is self explanatory but there are a few interesting and
(to me) mystifying points. Note the L. Rad Air Out temperature (air temp
after passing through rad). According to Paul L., the optimum for this
parameter is 10 - 20 deg F. above ambient OAT. I wanted a lot more than
that to minimize the number of CFM required and as you can see, mine is
running as much as 127 deg F above OAT which is even more than I figured
on.
The real mystery is the comparisons between rad inlet temp, rad outlet
temp and C.C. coolant temp (coolant temp measured right after passing
both rotor combustion chambers). In a 2nd gen 13B the CC coolant
temp is the hottest coolant in the engine because it normally cools slightly
after passing through the cooler intake port side of the engine. This is
the rad inlet temperature. As you can see, the CC temp and rad inlet
temp start out the same. When the power is increased, the rad inlet temp
climbs faster and higher than CC in the Renesis. I assume this is caused
by the increased heat picked up from the longer exhaust ports. It is the
amount that surprises me. Study the temp differentials between these
three temps and see if you can see the mystery and make sense of this.
The Chart is pretty crowded even after I eliminated several parameters
for this jpeg but when viewing it in Excel, it is very easy to see and
identify all the data. Moving the mouse pointer to any point of any
parameter pops up a little tag showing what the item is and the exact digital
value at that point in time.
Tracy