What is the minimum take off rpm for cessna 206?

Question

when you move the throttle to full, the rpm goes to the yellow about 2730 rpm,and then drops back and remains steady at about 2650 to 2680 .the red mark for max rpm is 2850,the yellow cautionally mark starts at 2700 to 2850,.the other engine parameters look fine. The POH does not mention anything with the minimum it only talks about the maximum rpm.the POH also gives normal operating range as 2200 to 2550.max continous 2700.

Answer 1

Agree with GJ289FIA.  Full power for takeoff ("push everything to the firewall" technique) & initial climb.  There's no point in quoting minimum revs, it's irrelevant, though you may get away with a little less than max if the runway's long enough . . .

There's no problem with the revs straying momentarily into the yellow, that's what it's there for.  It's just a reminder not to stay there for any lengthy period.

Answer 2

Are you asking because you are not developing full rpm?

If so dont take off! taxi back to your maintenance facility and get it sorted.

Answer 3

The POH is correct.  There is no minimum specified since max available power is expected to be used for take-off and initial climb.  Once a safe altitude is reached, reduce the MP/RPM to what is specified.   My ancient POH recommends 2550 for the RPM and 25 inches MP (we normally used 25 square, tho).  This was on an older 206.  If you're flying a fairly recent bird, things may be a bit different.

Answer 4

Well, I fly a 206 and you should be getting 2850RPM just before full throttle.  I fly in high density altitudes and never have a problem with this.

While it might not seem like a big deal and the POH doesn't mention a minimum RPM, the ONLY way the engine will generate 300HP and give you the POH take off and obstacle clearance figures is for it to be spinning at 2850RPM.  The IO-520s that have a red line at 2700RPM only generate 285HP.

Also you are being harder on the engine if you are using full throttle without max RPM (you wouldn't put 27" MP with 2200RPM, would you?)

The problem most likely is either the prop governor needs the fine pitch stop adjusted or the prop control isn't letting the governor hit the fine pitch stop.  Some operators turn the prop governor stop back a bit to cut down on the noise but this is unapproved.  A better way is to do a reduced power takeoff (24.5"/2550RPM, same as climb) if you don't need the performance.