[n468ac]

Ok here's the project?

Today I build four vortex generators out of 1 1/2" x 1 1/2" x 1/16" alum stock, I made them 3" long with the square edges.

I placed two at a 40deg angle to one another 3" apart in front of the nose wheel fairing. I also placed two at a 40deg angle 6" apart on the lower cowl just in front of the exhaust pipes.

I'm trying to lower the CHT's by cleaning up the exit air.

Before VG's:
MAX POWER CLIMB
80KTS
FULL POWER
To 3800 MSL from 580 MSL
max CHT 447

CRUSE test
2500 rpm
OT 71 deg
max CHT 348 (all CHT's within 7 deg)
3800' MSL

After VG's:
MAX POWER CLIMB
80KTS
FULL POWER
To 3800 MSL from 580 MSL
max CHT 441

CRUSE test
2500 rpm
OT 71 deg
max CHT 338 (all CHT's within 7 deg)
3800' MSL

The question is....

Is it worth the trouble to continue this approach for 10 degs?
or
I'm I just barking up the wrong tree?

Sorry no pictures ... I didn't even know if this was going to do anything at all.

 

[BrickPilot]

To use a comparison... when we were working on release 14 for AutoCAD, it a couple years and lots of effort, but our guys made tiny incremental gains in performance during each submission. Half a percent here, quarter of a percent there. By the end, it added up and R14 was the fastest AutoCAD ever released.

I'd say go for it... if you have the time, the incremental gains add up. But that's just me thinking out loud.