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Odd turboprop problem (Read 183 times)
May 30th, 2006 at 1:37pm

Travis   Offline
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Dripping Springs, TX

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I've been messing around with a turboprop aircraft config recently.  Now whenever I slew a bit it will throttle up a bit (about 35% I think) and will not throttle back or forward.  The throttle settings on the instrument panel (no VC) show that the throttle is at idle, but the turbine sound goes up and it starts moving forward, fast enough to achieve rotation.

I've checked everything I can think of.  Autopilot is off, I ground-check the aircraft before I leave slew (F1 to the ground) and there are no contact points below the surface or anything like that.  If I just start a regular flight and startup normally and everything, it works fine.  I can go through a whole flight with no problem.  It just happens when I turn on slew.  The obvious solution is to just not slew with this aircraft, but I want to post it eventually, and the problem would be a great annoyance to anyone trying to fly it.

Any clews?
 

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Reply #1 - May 30th, 2006 at 8:24pm

Milton   Offline
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In slew, it is A to the ground, and F1 to Idle.

Check your cfg for these things:

beta_max=45 to 65 depending on your air file table 511
beta_min=11.800  <--- s/b 15 or less
min_gov_rpm=17309.000  <---- set this so that when divided by gear_reduction_ratio, prop speed is 700 rpms (or multiply gear rection ratio by 700 to calc this)
prop_tc=0.011                      
gear_reduction_ratio=24.7272  Get this number from your specs or engine/aircraft mfr.
 

Milton&&Dash 7, Aero Commanders, Howard 500, D18S, Spartan, XP47J, Beechcraft A28 (Grizzly)
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Reply #2 - Jun 1st, 2006 at 5:57pm

Travis   Offline
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Cannot find REALITY.SYS.
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Dripping Springs, TX

Gender: male
Posts: 4515
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Thanks, Milton.  My min_gov_rpm was way off the mark.  That's settled, now, but I have another problem.

I'm setting up the VC, and I don't rightly know which parts are necessary for a turboprop startup and all that.  I can figure out what else to add, but the main startup sequence I am completely unfamiliar with.  If anyone knows a short (or long) list of the parts necessary to start two engines from the VC, I would be most appreciative . . .
 

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