Two more cents
 

Turbo RSTOL 337

Based at www.potomac-airfield.com KVKX

2665 x 40 ft, surrounded by tall trees, deep in a valley,
surrounded by surface to air defenses around Washington DC...

(While 'encouraging' a rapid climb, I don't think they actually affect climb rate).

1/3 to 2/3 flaps (RSTOL)
Max power.
Begin roll.

Once in a positive climb bring RPM back 'just a hair'
Don't touch throttles.

You will clearly hear the grinding supersonic prop tips' 'suddenly go 'quiet"

Try that in level flight somewhere. You'll hear it,

I don't touch anything else until 500ft or more.
Then gear.
Then flaps.