Author Topic: P-38 Rpm  (Read 11118 times)

Offline Randy1

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Re: P-38 Rpm
« Reply #30 on: October 02, 2016, 08:02:29 AM »
I fly the P-38 a lot.  The AH3 version SEEMS to fly heavier than the AH2.  Note I said SEEMS.  I am not sure if it is just the way the graphics are displayed that gives us a different perception of speed.

Offline Ack-Ack

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Re: P-38 Rpm
« Reply #31 on: October 02, 2016, 02:51:12 PM »
P-38 flies no different than it did in AH2.
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Offline FLS

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Re: P-38 Rpm
« Reply #32 on: October 02, 2016, 03:11:01 PM »
I fly the P-38 a lot.  The AH3 version SEEMS to fly heavier than the AH2.  Note I said SEEMS.  I am not sure if it is just the way the graphics are displayed that gives us a different perception of speed.

Does it seem to have a slower climb rate on the gauges?

Offline GScholz

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Re: P-38 Rpm
« Reply #33 on: October 02, 2016, 06:28:17 PM »
I can attest that Ack-Ack flies the P-38 with the same deadly intent that he used to in both AH and AH2...  :old:
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Offline 38ruk

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Re: P-38 Rpm
« Reply #34 on: October 02, 2016, 06:59:36 PM »
P-38 flies no different than it did in AH2.

Hard to argue with you about the 38 , but in AH2 i didnt see a 4-500 rpm drop when maneuvering the plane hard.

Am I wrong to assume that when the plane drops down to 2600 rpm @ 60'' of manifold pressure that it doesn't produce the same power as it would at 3000 rpm 60''? 

Offline FLS

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Re: P-38 Rpm
« Reply #35 on: October 02, 2016, 07:03:01 PM »
Hard to argue with you about the 38 , but in AH2 i didnt see a 4-500 rpm drop when maneuvering the plane hard.

Am I wrong to assume that when the plane drops down to 2600 rpm @ 60'' of manifold pressure that it doesn't produce the same power as it would at 3000 rpm 60''?

The prop pitch governor lag is a new feature in AH3.

Offline ACE

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Re: P-38 Rpm
« Reply #36 on: October 25, 2016, 09:40:33 AM »
I understand your point. I had a similar experience with stall departures.  :D

You can compare the stall by matching speed and g load on the accelerometer between AH2 and AH3. Pulling past the stall to departure will let you compare recovery.

I assume you have the same advanced stick settings and calibration.
What do you mean advanced stick scailing? I used to tweak my sliders in the advanced tab long ago but I have forgotten my settings. Can you elaborate.
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Offline FLS

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Re: P-38 Rpm
« Reply #37 on: October 25, 2016, 10:56:24 AM »
What do you mean advanced stick scailing? I used to tweak my sliders in the advanced tab long ago but I have forgotten my settings. Can you elaborate.

My point that you quoted was simply that it's easier to compare performance with the same stick settings.

I don't use scaling on my stick just my rudder pedals but if you want to use it the default scaling is fine.

Offline ACE

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Re: P-38 Rpm
« Reply #38 on: October 25, 2016, 11:20:53 AM »
My point that you quoted was simply that it's easier to compare performance with the same stick settings.

I don't use scaling on my stick just my rudder pedals but if you want to use it the default scaling is fine.

I gotcha. I used to have mine setup to where it was like a set of steps. I just don't remember how I had it.
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Offline FLS

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Re: P-38 Rpm
« Reply #39 on: October 25, 2016, 11:26:41 AM »
If you use modes you can easily compare stick scalings. Just copy mode 1 to mode 3 and scale mode 3 differently. Set up a button to switch modes.

Offline Dobs

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Re: P-38 Rpm
« Reply #40 on: October 25, 2016, 11:49:11 AM »
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Offline Hajo

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Re: P-38 Rpm
« Reply #41 on: October 25, 2016, 09:38:00 PM »
I do know that todays prop pitch on a C130 is set to engine torque.  In other words set the torque setting in which you wish to fly and the prop pitch automatically changes accordingly.

I am wondering if any WWII aircraft had that ability?
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Offline hitech

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Re: P-38 Rpm
« Reply #42 on: October 28, 2016, 09:51:53 AM »
I do know that todays prop pitch on a C130 is set to engine torque.  In other words set the torque setting in which you wish to fly and the prop pitch automatically changes accordingly.


You sure about this? This would mean the prop is not constant speed.

HiTech

Offline Hajo

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Re: P-38 Rpm
« Reply #43 on: October 28, 2016, 10:31:58 AM »
You sure about this? This would mean the prop is not constant speed.

HiTech

Yes I am.  I have two friends in the 910th tactical C-130 squadron based at Youngstown Air Base.  While sitting in the cabin with the Pilot, (wife) and flight engineer (husband) I asked about prop pitch.

They both told me pitch was determined by torque.  They set the torque and the 130s prop pitch adjusts accordingly.  They showed me the torque setting on the instrument panel for each engine (separate gauges)

Made sense to me.
« Last Edit: October 28, 2016, 12:36:19 PM by Hajo »
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Offline Golfer

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Re: P-38 Rpm
« Reply #44 on: October 28, 2016, 10:53:22 AM »
I snapped a screenshot and sent off to a C130 aircraft commander who has been in Hercs for a good while for a more thorough explanation and confirm that what's been understood here is or isn't what actually happens.  Not sure what part of the world he's in at the moment.