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Left prop is feathered which is unusual on the ground for a Garrett engined a/c. But the R/H prop is in the usual flat (very fine) pitch which reduces starting loads.
Chris, your photo and comment fascinate me and I have been trying to find an answer for years, which is, all turboprops I see when on the ground and starting up, all have their props pitched flat to the air as shown in the left prop, which I would gather would have the most air resistance which doesn't make sense to me.
You indicate and mention that such a flat pitched prop is unusual yet that is how I see them all, when parked and when starting up.
I am obviously not a pilot, but could you or someone explain why they are the way they are when I see them and I assume that is the correct way even though you say it is unusual.
Confused I am. ;-)
I would have thought being flat to the wind would provide a lot of wind resistance to the start-up and make it harder on the starter motors.
You indicate and mention that such a flat pitched prop is unusual yet that is how I see them all, when parked and when starting up.
I am obviously not a pilot, but could you or someone explain why they are the way they are when I see them and I assume that is the correct way even though you say it is unusual.
Confused I am. ;-)
I would have thought being flat to the wind would provide a lot of wind resistance to the start-up and make it harder on the starter motors.
First off, Chris Robey is referring to the left engine, NOT the engine in the left side of the photo.
Garretts are normally shut down with the the prop blades in the flat or fine pitch setting.
Pratt and Whitney PT6's are shut down in the feathered setting. It has something to do with the different way they operate and whether it's a free shaft or something.
I only flew Pratts on the King Airs and never flew Garrett turboprops.
Apparently you can shut down a Garrett TPE331 either way though.
Garretts are normally shut down with the the prop blades in the flat or fine pitch setting.
Pratt and Whitney PT6's are shut down in the feathered setting. It has something to do with the different way they operate and whether it's a free shaft or something.
I only flew Pratts on the King Airs and never flew Garrett turboprops.
Apparently you can shut down a Garrett TPE331 either way though.
Thanks, Jim and I assumed the attention was given for the port (left) engine.
I am just curious why such turboprops always seem to be started up with the blades feathered flat to the wind, not just when shutting down, and doing that actually makes sense.
What doesn't make sense to me is having the blades feathered flat against the wind that would increase the spinning resistance. And is there any reason for doing so???
Or are the props just freewheeling during startup and there isn't any actual resistance on the starter motor engines involved???
I am just curious why such turboprops always seem to be started up with the blades feathered flat to the wind, not just when shutting down, and doing that actually makes sense.
What doesn't make sense to me is having the blades feathered flat against the wind that would increase the spinning resistance. And is there any reason for doing so???
Or are the props just freewheeling during startup and there isn't any actual resistance on the starter motor engines involved???
Hi Patrick. The Garrett TPE331 engines in this Skyvan are fixed shaft turboprops. So there is a direct physical connection between compressor section, turbine and propeller. So this will mean that the lowest starting load will occur with the blades in the normal (for a Garrett) fine pitch (like the actual R/H prop in this shot of N196WW). The PWC PT6A turboprop which is widely used (including on MOST, but not on all Beech King Airs) is a free turbine design where there is only a gas connection between the compressor section and the turbine section and the propeller. These blades normally start out slowly from the feathered position, which has the benefit of being safer for ground personnel.
Thanks, Chris and others, who supplied my brain with some more information it can use,
in the air as we "speak" 09:18 EDT August 28, 2020
NICE pic!
NICE pic!
Unkind folks used to say that the Shorts was "the box that the Dornier 328 came in!"
Love the fat boy short...looks like it just ate 3 little planes
The Skyvan can carry a vehicle driven up the rear ramp.
The Irish Concorde :)
ACTIVITY LOG
Want a full history search for N196WW dating back to 1998? Buy now. Get it within one hour.
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Date | Aircraft | Origin | Destination | Departure | Arrival | Duration |
---|---|---|---|---|---|---|
12-Feb-2025 | Unknown | Near Riverside, CA | Coolidge Muni (P08) | First seen 10:01AM PST | 12:41PM MST | 1:40 |
11-Feb-2025 | Unknown | Near Riverside, CA | Near Riverside, CA | First seen 04:03PM PST | 04:16PM PST | 0:13 |
11-Feb-2025 | Unknown | Near Riverside, CA | Near Riverside, CA | First seen 03:27PM PST | 03:43PM PST | 0:15 |
11-Feb-2025 | Unknown | Near Riverside, CA | Near Riverside, CA | First seen 02:50PM PST | 03:06PM PST | 0:15 |
11-Feb-2025 | Unknown | Near Riverside, CA | Near Riverside, CA | First seen 02:12PM PST | 02:30PM PST | 0:17 |
11-Feb-2025 | Unknown | Near Riverside, CA | Near Riverside, CA | First seen 01:29PM PST | 01:44PM PST | 0:15 |
11-Feb-2025 | Unknown | Near Riverside, CA | Near Riverside, CA | First seen 01:05PM PST | 01:15PM PST | 0:09 |
11-Feb-2025 | Unknown | Near Riverside, CA | Near Riverside, CA | First seen 12:31PM PST | 12:41PM PST | 0:09 |
11-Feb-2025 | Unknown | Near Riverside, CA | Near Riverside, CA | First seen 09:39AM PST | 09:50AM PST | 0:10 |
11-Feb-2025 | Unknown | Near Riverside, CA | Near Riverside, CA | First seen 09:17AM PST | 09:29AM PST | 0:11 |
11-Feb-2025 | Unknown | Near Riverside, CA | Near Riverside, CA | First seen 08:42AM PST | 08:52AM PST | 0:10 |
11-Feb-2025 | Unknown | Near Riverside, CA | Near Riverside, CA | First seen 07:53AM PST | 08:15AM PST | 0:22 |
10-Feb-2025 | Unknown | Near Riverside, CA | Near Riverside, CA | First seen 03:23PM PST | 03:34PM PST | 0:10 |
10-Feb-2025 | Unknown | Near Riverside, CA | Near Riverside, CA | First seen 02:45PM PST | 02:55PM PST | 0:10 |
10-Feb-2025 | Unknown | Near Riverside, CA | Near Riverside, CA | First seen 02:21PM PST | 02:35PM PST | 0:14 |
10-Feb-2025 | Unknown | Near Riverside, CA | Near Riverside, CA | First seen 01:34PM PST | 01:48PM PST | 0:13 |
10-Feb-2025 | Unknown | Near Riverside, CA | Near Riverside, CA | First seen 12:54PM PST | 01:08PM PST | 0:14 |
10-Feb-2025 | Unknown | Near Riverside, CA | Near Riverside, CA | First seen 11:39AM PST | 11:59AM PST | 0:20 |
10-Feb-2025 | Unknown | Near Riverside, CA | Near Riverside, CA | First seen 11:13AM PST | 11:33AM PST | 0:19 |
10-Feb-2025 | Unknown | Near Riverside, CA | Near Riverside, CA | First seen 10:53AM PST | 11:05AM PST | 0:12 |
10-Feb-2025 | Unknown | Near Riverside, CA | Near Riverside, CA | First seen 10:26AM PST | 10:39AM PST | 0:13 |
10-Feb-2025 | Unknown | Near Riverside, CA | Near Riverside, CA | First seen 10:02AM PST | 10:18AM PST | 0:15 |
10-Feb-2025 | Unknown | Near Riverside, CA | Near Riverside, CA | First seen 09:37AM PST | 09:51AM PST | 0:13 |
10-Feb-2025 | Unknown | Near Riverside, CA | Near Riverside, CA | First seen 09:18AM PST | 09:29AM PST | 0:10 |
10-Feb-2025 | Unknown | Near Riverside, CA | Near Riverside, CA | First seen 08:53AM PST | 09:07AM PST | 0:14 |
10-Feb-2025 | Unknown | Near Riverside, CA | Near Riverside, CA | First seen 08:34AM PST | 08:44AM PST | 0:09 |
10-Feb-2025 | Unknown | Near Riverside, CA | Near Riverside, CA | First seen 08:12AM PST | 08:27AM PST | 0:15 |
10-Feb-2025 | Unknown | Near Riverside, CA | Near Riverside, CA | First seen 07:42AM PST | 07:58AM PST | 0:15 |
09-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Near Riverside, CA | 03:31PM MST | 05:12PM PST | 2:41 |
07-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 11:36AM MST | 11:56AM MST | 0:20 |
07-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 10:54AM MST | 11:07AM MST | 0:12 |
07-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 10:35AM MST | 10:48AM MST | 0:13 |
07-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 10:06AM MST | 10:26AM MST | 0:20 |
07-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 09:25AM MST | 09:44AM MST | 0:18 |
07-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 08:50AM MST | 09:06AM MST | 0:16 |
07-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 08:26AM MST | 08:43AM MST | 0:17 |
07-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 07:39AM MST | 07:55AM MST | 0:15 |
07-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 07:19AM MST | 07:35AM MST | 0:16 |
07-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 06:59AM MST | 07:15AM MST | 0:16 |
06-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 11:47AM MST | 12:05PM MST | 0:18 |
06-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 11:25AM MST | 11:42AM MST | 0:16 |
06-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 10:57AM MST | 11:12AM MST | 0:15 |
06-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 10:20AM MST | 10:35AM MST | 0:15 |
06-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 10:00AM MST | 10:14AM MST | 0:13 |
06-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 09:39AM MST | 09:55AM MST | 0:15 |
06-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 09:05AM MST | 09:20AM MST | 0:15 |
06-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 08:43AM MST | 08:59AM MST | 0:15 |
06-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 08:22AM MST | 08:37AM MST | 0:15 |
06-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 07:45AM MST | 08:01AM MST | 0:16 |
06-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 07:24AM MST | 07:41AM MST | 0:16 |
06-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 07:01AM MST | 07:18AM MST | 0:16 |
05-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 12:02PM MST | 12:20PM MST | 0:17 |
05-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 11:32AM MST | 11:54AM MST | 0:21 |
05-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 11:09AM MST | 11:25AM MST | 0:15 |
05-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 10:31AM MST | 10:47AM MST | 0:15 |
05-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 10:11AM MST | 10:27AM MST | 0:16 |
05-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 09:50AM MST | 10:07AM MST | 0:16 |
05-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 09:12AM MST | 09:27AM MST | 0:15 |
05-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 08:50AM MST | 09:05AM MST | 0:15 |
05-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 08:27AM MST | 08:44AM MST | 0:16 |
05-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 07:47AM MST | 08:02AM MST | 0:15 |
05-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 07:25AM MST | 07:41AM MST | 0:16 |
05-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 07:04AM MST | 07:21AM MST | 0:17 |
04-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 11:30AM MST | 11:37AM MST | 0:06 |
04-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 11:08AM MST | 11:25AM MST | 0:16 |
04-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 10:39AM MST | 10:57AM MST | 0:18 |
04-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 10:19AM MST | 10:35AM MST | 0:16 |
04-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 09:44AM MST | 10:01AM MST | 0:17 |
04-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 09:21AM MST | 09:39AM MST | 0:17 |
04-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 08:59AM MST | 09:15AM MST | 0:15 |
04-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 08:23AM MST | 08:40AM MST | 0:16 |
04-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 08:01AM MST | 08:18AM MST | 0:17 |
04-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 07:38AM MST | 07:57AM MST | 0:18 |
03-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 11:04AM MST | 11:22AM MST | 0:18 |
03-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 10:38AM MST | 10:57AM MST | 0:18 |
03-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 10:12AM MST | 10:31AM MST | 0:18 |
03-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 09:29AM MST | 09:48AM MST | 0:18 |
03-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 09:08AM MST | 09:25AM MST | 0:17 |
03-Feb-2025 | Unknown | Marana Rgnl (KAVQ) | Marana Rgnl (KAVQ) | 08:39AM MST | 08:59AM MST | 0:19 |
03-Feb-2025 | Unknown | Coolidge Muni (P08) | Marana Rgnl (KAVQ) | 06:11AM MST | 06:29AM MST | 0:18 |
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