P-38 Rpm

[38ruk]

I've noticed as much as a 400 rpm drop when doing hard vertical maneuvers  with a P-38. Is this normal behavior for constant speed props ? I haven't notice as big of a drop with other planes . thanks

[oboe]

Very interested in this answer as well.  Seems to be the worst in P-38G to me.

[Golfer]

Might have to do with the propellers being electrically actuated rather than hydraulic.

No idea how it works, it's all black magic and wizardy but that's my first guess.

[Chalenge]

More than you ever wanted to know about constant speed propellers:

https://www.youtube.com/watch?v=WZ1hu6rVBzA&t=1668s

[Golfer]

Does it address electrically actuated propellers or just standard hydraulic propellers?

[GScholz]

In AH3 there is a lag modeled in the prop governor. Quick changes in speed (typically during vertical maneuvering) will now result in RPM changes until the governor can catch up.

[Golfer]

I love the feature. The first time I heard it during a short beta stint I was surprised and impressed because it sounded and behaved authentically. I had a geeky smile.

I'm just wondering if the voodoo of the electric props explains the difference between the 38 and other airplanes.

[oboe]

If I recall correctly, the P-39 had an electric prop as well.

[Randy1]

This just another neat feature of AH3.  There are many.  Note too, there are times when the rpm exceeds 3000 rpm.

[hitech]

I love the feature. The first time I heard it during a short beta stint I was surprised and impressed because it sounded and behaved authentically. I had a geeky smile.

I'm just wondering if the voodoo of the electric props explains the difference between the 38 and other airplanes.

I had the same thing when I took the sim RV out for some areo. Suddenly it was wow that really changes the feel of how it actually sounds and the ques you do not realize you are using in real flight.

HiTech

[Mongoose]

So what exactly was the change that was made? Somewhere along the line I missed that announcement.

[colmbo]

I don't understand why you would lose RPM even if working the airplane hard.  The engine is capable of turning the prop at 3000RPM at low airspeed....it does every takeoff.  The change in speed isn't going to be so abrupt that even a slow electric prop can't keep up with the change.

Was the prop pitch set by an electric motor?  Or was it just an electric governor controlling the prop which still uses engine oil pressure/spring pressure to set pitch?  The B-24 used the latter setup.  The prop controller was prone to failure, usually required an engine shut down and a whack with a rubber mallet (more easily accomplished on the ground).

[Golfer]

I'm not sure. Whenever I've read about them they are distinguished as electrically actuated propellers.

I'm curious and was sure someone would know.

[Golfer]

I've been googling. Seems they use an electric motor.



http://www.enginehistory.org/Propellers/Curtiss/curtissprop.shtml

[hitech]

I don't understand why you would lose RPM even if working the airplane hard.  The engine is capable of turning the prop at 3000RPM at low airspeed....it does every takeoff.  The change in speed isn't going to be so abrupt that even a slow electric prop can't keep up with the change.

Was the prop pitch set by an electric motor?  Or was it just an electric governor controlling the prop which still uses engine oil pressure/spring pressure to set pitch?  The B-24 used the latter setup.  The prop controller was prone to failure, usually required an engine shut down and a whack with a rubber mallet (more easily accomplished on the ground).

Is do to the deacceleration. Rpm has to decrease before it can take less bite and increase. How much and how quickly I have no info on. Just went by feel of how RV sounds in loops.

HiTech