Engine mixture guidelines

"Thomas Borchert" wrote in message
...
Lean the mixture until it peaks and then enrichen it
(turn it back in) until it drops 50°C.

Not necessary the best advice.

Remember FULL rich for takeoffs and landings unless your flying at
Leadville, CO or some other really high altitude airport.

That is actually VERY BAD and DANGEROUS advice! You will need to lean
for take-off at density altitudes of 3000 feet or above for max power.
Actual airport elevation is irrelevant in this discussion, density
altitude is all that matters.

--
Thomas Borchert (EDDH)

Ok confession time: I've never been PIC with a controllable prop.

3000 feet density altitude fits with 75% power in the POHs that I recall
reading for trainers with fixed pitch props.

OTOH, high power levels are available to a higher density altitude with a
controllable prop--consult the POH. If the POH is old, consult the engine
manufacturer.

(I really wish that I could say "consult an instructor or mechanic at the
local FBO" )

Peter

Peter,

OTOH, high power levels are available to a higher density altitude with a
controllable prop.


They are? How would that work? (flying a Tobago with CS prop)

--
Thomas Borchert (EDDH)

"Thomas Borchert" wrote in message
...
Peter,

OTOH, high power levels are available to a higher density altitude with
a
controllable prop.


They are? How would that work? (flying a Tobago with CS prop)

--
Thomas Borchert (EDDH)

Full RPM on a CS prop is usually higher than the fixed pitch prop will allow
under most conditions of flight--especially take off and climb.

Peter

Peter,

Full RPM on a CS prop is usually higher than the fixed pitch prop will allow
under most conditions of flight--especially take off and climb.


Does that mean higher engine power output or just better conversion of the
same engine output?

--
Thomas Borchert (EDDH)

"Thomas Borchert" wrote in message
...
Peter,

Full RPM on a CS prop is usually higher than the fixed pitch prop will
allow
under most conditions of flight--especially take off and climb.


Does that mean higher engine power output or just better conversion of the
same engine output?

--
Thomas Borchert (EDDH)

Higher power, presuming of course that you also have the throttle full
forward and similar induction systems, etc...

Peter

Peter Dohm wrote:



3000 feet density altitude fits with 75% power in the POHs that I recall
reading for trainers with fixed pitch props.

75% is available to about 8000 feet, depends on temp.



OTOH, high power levels are available to a higher density altitude with a
controllable prop--consult the POH.

Yes, indeed, consult the POH. The prop is irrelavant to the discussion
unless you've installed one hell of a cruise prop that just won't turn up.