Simviation Forum - Pilatus PC-6 Turbo Porter

Jan 20^th, 2012 at 3:38pm

Jokerc152 Offline
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I just downloaded this there very nice vc and outer design but does anyone else have the problem when they throttle forward the rpm shoots away up as if you were at full throttle (when I was at less than a 1/4 maybe? for taxiing) and the aircraft wants to go to full speed? anyone else find this or just me ? :S
???

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Reply #1 - Jan 20^th, 2012 at 5:11pm

jetprop Offline
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i don't have that problem,the only problem is that my RPM gauge only works in the air. :?

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Reply #2 - Jan 20^th, 2012 at 5:51pm

Jokerc152 Offline
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Very Strange i mean it only happens after start up and after landing when im taxiing when i'm in the air I can control it by making really small adjustments :S strange your problem.

Did you check your Vacuum gauge maybe its low because your not in the air ? just a guess though :S?

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Reply #3 - Jan 20^th, 2012 at 6:58pm

dave3cu Offline
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Turbo prop throttles are touchy on taxi. Some turbo props, like the default C208 Caravan, have a 'Conditioner' control that allows you to set a lower idle torque. This provides a little better control of taxi speed. Though the Porter does not have a Conditioner control, you can lower the idle torque using your 'lean mixture' keyboard (Ctrl-Shift-F2) or mixture axis if you have one. Just don't go to far or you'll hit 'Cutoff'.

Jetprop- "my RPM gauge only works in the air. :?" You sure your looking a the right gauge? The Porter only has a 'Percent RPM' guage which works properly. Maybe you're mistaking the 'X 1000 FPM' which is the VSI.

At that time [1909] the chief engineer was almost always the chief test pilot as well. That had the fortunate result of eliminating poor engineering early in aviation. Igor Sikorsky

I intend to live forever....so far, so good. Steven Wright

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Reply #4 - Jan 21^st, 2012 at 3:11am

jetprop Offline
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dave3cu wrote on Jan 20^th, 2012 at 6:58pm:

Turbo prop throttles are touchy on taxi. Some turbo props, like the default C208 Caravan, have a 'Conditioner' control that allows you to set a lower idle torque. This provides a little better control of taxi speed. Though the Porter does not have a Conditioner control, you can lower the idle torque using your 'lean mixture' keyboard (Ctrl-Shift-F2) or mixture axis if you have one. Just don't go to far or you'll hit 'Cutoff'.

Jetprop- "my RPM gauge only works in the air. :?" You sure your looking a the right gauge? The Porter only has a 'Percent RPM' guage which works properly. Maybe you're mistaking the 'X 1000 FPM' which is the VSI.

oh,that must be it i thought it said X 1000 RPM. Grin

« Last Edit: Jan 21^st, 2012 at 8:10am by jetprop »

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Reply #5 - Jan 21^st, 2012 at 3:41am

Jokerc152 Offline
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Thanks for the info appreciated

the only other problem I have is after start up with throttle set to idle it still Wants to shoot off? :S

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Reply #6 - Jan 21^st, 2012 at 11:19am

dave3cu Offline
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Quote:

the only other problem I have is after start up with throttle set to idle it still Wants to shoot off?

That's not uncommon with turbo props.

Make sure your parking brake is set before startup.

After startup, the torque will surge. Allow it to settle, this may take 30 secs. or more and should settle at about 8. Though the panel does not have a visible 'Conditioner' lever, you can lower the torque to low idle using your mixture control. You should be able to lower to about 5.

Once rolling, it doesn't take much throttle. A torque reading of 10 will maintain a taxi speed of 15-20 knots. On my X-45 throttle that's less than 1/4 inch.

At that time [1909] the chief engineer was almost always the chief test pilot as well. That had the fortunate result of eliminating poor engineering early in aviation. Igor Sikorsky

I intend to live forever....so far, so good. Steven Wright

You know....you can just rip up a to-do list.

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Reply #7 - Jan 21^st, 2012 at 11:28am

Jokerc152 Offline
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Thanks for clearing that up as I;m just getting into doing a lot of flight time with turbo props I thought I had encountered a problem but i'll work on the mixture control and see how it goes

Would you recommend making the mixture more lean after im in the air cruising or ..? :S

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Reply #8 - Jan 21^st, 2012 at 11:49am

dave3cu Offline
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Quote:

Would you recommend making the mixture more lean after im in the air cruising or

No. Unlike piston engines, there is no actual 'mixture' control on turbine engines. In turbo props, the mixture control only controls the 'Conditioner', ie. hi idle-low idle-fuel cut off.

The Conditioner, via the mixture control, should be returned to hi idle (ctrl-shift-F4) before takeoff.

At that time [1909] the chief engineer was almost always the chief test pilot as well. That had the fortunate result of eliminating poor engineering early in aviation. Igor Sikorsky

I intend to live forever....so far, so good. Steven Wright

You know....you can just rip up a to-do list.

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