ORIGINAL: 1QwkSport2.5r
ORIGINAL: SrTelemaster150
ORIGINAL: jeffie8696
I use 10,000 rpm as a limit for static rpms on any prop for mid sized 4S engines.
In other words I ground test any prop I am interested in trying and if it turns over 10,000 static it might over rev the engine and cause wear, stress on the engine.
I allow slightly higher rpm limits on smaller 4S engines.
That's a good bench mark for medium sized 4-strokes.
My CDI fired Saito FA91S was spinning a 15 x 4 @ 10,300, a bit more than I liked.
I went to a 15 x 5 & the revs dropped to 9,700, a bit more cushion against overreving in the air.
Whats the typical rev range for the average OS or Saito 4-stroke?
Saito FA91S specified max is 11,000 RPM.
Mine idles @ 1700 RPM W/CDI firing things off 11* BTDC @ idle.
Initial full advance timing setting is 35* BTDC.