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Author
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Topic: Plane builders - please read
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Maury Markowitz
Pilot
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posted 06-25- 07:25 AM
   
I've been poking about in many planes in an effort to learn some of the tips and tricks in OP. One thing I've noticed is that almost every plane has it's propMin set to 0. propMin is the minimum angle that the prop can turn to when trying to adjust speed.I don't believe this is accurate. Digging into the few refs I do have I see that typical numbers are in the 20-25 degree range. I don't believe there were any planes that could go to zero or negative until the early 50's, so this isn't too surprising. The effect this has is primarily when you dial back the power. With the pitch set to zero the prop can adjust to very low power settings, so you don't hear it slow down (in the patch) until the plane is going really slow. I'll see if I can dig up numbers on various aircraft. Maury IP: Logged |
Snickers
Pilot
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posted 06-25- 12:37 PM
Now you have my curiosity up... It was my understanding the PBY could do negative pitch (if you stop and think about it, she almost had to...  )I will check and see....
Snick IP: Logged |
Maury Markowitz
Pilot
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posted 06-25- 01:48 PM
quote:
Originally posted by Snickers:
Now you have my curiosity up... It was my understanding the PBY could do negative pitch (if you stop and think about it, she almost had to
In this case I wouldn't be surprised, as I understand it the reverse-pitch was used almost entirely on cargo aircraft. Maury IP: Logged |
Snickers
Pilot
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posted 06-25- 04:56 PM
Got the word from a couple of PBY pilots. No. PBY could not do reverse pitch... (live and learn...) IP: Logged |
ArgonV
Pilot
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posted 06-25- 05:05 PM
Also take into consider the AI when tweaking the prop settings. If you do it wrong, their engine will die idling on the runway before takeoff.IP: Logged |
Maury Markowitz
Pilot
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posted 06-25- 05:25 PM
quote:
Originally posted by ArgonV:
Also take into consider the AI when tweaking the prop settings. If you do it wrong, their engine will die idling on the runway before takeoff.
Sweet. Any ideas what sort of limits we have? Maury IP: Logged |
ArgonV
Pilot
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posted 06-25- 05:41 PM
I seem to remember that the AI doesnt like constant pitch props... Beyond that I dont know the specifics. Ive played around with it a few times on a few WWI kites that the AI didnt like when it came to sittin on the runway idling.IP: Logged |
jedi
Pilot
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posted 06-25- 08:01 PM
I think the min=0 thing is necessary in order for the prop to feather. When it's "governing" it probably won't need to go all the way to 0 pitch.Incidentally, if you DO give the prop a negative pitch angle, it WILL generate "reverse thrust." I had the Corsair going backwards a few times With the new prop control options in the patch, I would think we could build in reversible props if we wanted to. Not much use for our planes, but if I ever do a C-130... ------------------
--jedi-- IP: Logged |
Maury Markowitz
Pilot
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posted 06-26- 07:17 AM
quote:
Originally posted by jedi:
I think the min=0 thing is necessary in order for the prop to feather. When it's "governing" it probably won't need to go all the way to 0 pitch.
I'll try it, but feathering is actually pitch=90 degrees (think about it). quote:
Incidentally, if you DO give the prop a negative pitch angle, it WILL generate "reverse thrust." I had the Corsair going backwards a few times
Cool, all we need now is the "stop" at zero point. BTW, the planes I've flow that do have reverse (a twotter and dash-8) both have a min angle of about 15, when you clear the stops it jumps to about -5 to -10 (hard to tell). I guess we need a propReverseMin and propReverseMax! Maury IP: Logged |
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