Thread: maneuvers RPM's

HI everyone I just want to know what is the best rpm to do Slow fly, Landings with flap w/out flaps and others maneuvers.

Thank you

I usually do my approaches as 2700-3000 rpm, but I routinely use 15 degrees of flaps. In the pattern, I'm usually at 4000 rpm or so. You could probably fly at 3500 rpm if you wanted to.

wlfpckrs thank you for that advice... So what about the slow fly? What shod be a good constant rpm to keep altitude in a CTLS?

I use 4400 after I drop below 55 kt. 0 flaps.

Thank you opticsguy for that info. So Is just like regular cruising RPM, but in slow fly. Got it!! .

3500 to 4000 RPM is a good target for a loitering speed. Not exactly "slow flight" without flaps, but you'll get ~80kt IIRC.

Doug

Flying at 3500-4000 rpm just to take a look at something for a few moments is fine, but remember your engine was specifically designed to run between 4800-5200 rpm for your standard cruise. Even though your engine can theoretically run all day at 5500 rpm doesn't mean you should, it causes more wear than running at 5000. Running down at 4600 or lower for sustained cruise also causes more wear, but for different reasons.
You wouldn't take a 3 speed standard shift car designed to run between 45-75 mph and run it at 110 mph just because it could and you wouldn't take that same car in third gear and run it at 20 mph just because it could. You have wear issues on both sides of the coin for different reasons. Just because you can do something doesn't mean it is good for its long term health.

density altitude and prop pitch change the rpm.

roger is right on the need to keep rpm in range. a good tip is to pitch up for flap speeds, that way you can keep your throttle open and not cover too much distance slowing down. often i can keep my rpm at 5,000 even in the pattern

Hello ,

Hello Roger Lee . Please tell me what are the reasons for which running down at 4600 rpm or lower will cause more wear to the engine ? I ask you this, because I've seen planes equipped with rotax 912 with in-flight variable pitch prop , for which the POH state a 4400 rpm continuous cruise rpm . Also I think that a 5000 rpm cruise is a sustained effort for the engine, and as long as the engine is well cooled , enough pressure for the oil , not too much torque for the prop , a 4600 rpm cruise is preferable . But this are only my two cents !

Best regards,
Liciniu

Than you guys for all your help. It really make sense what you guys are saying now. I did practice it yesterday, we were practicing slow fly, and the rpm's that you guys gave me work for me but like CharlieTango say's:" density altitude and prop pitch change the rpm ". My CFI say the same thing that Roger Lee say that Flying at 3500-4000 rpm just to take a look at something for a few moments is fine, but that the engine was specifically designed to run between 4800-5200 rpm for cruising. The engine makes more force at a lower rpm. Typically if you are in that low rpm configuration you will be at high nose pitch , so the engine on low RPM is carrying all the weight at the aircraft with low power.