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Short Skyvan (N196WW) - Short visit to CYHU, 21-08-2020.
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Short Skyvan (N196WW)

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Short visit to CYHU, 21-08-2020.

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CHRIS ROBEY
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.
Champdriver
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.
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???
CHRIS ROBEY
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,
jesse kyzer
in the air as we "speak" 09:18 EDT August 28, 2020
NICE pic!
adelma
Unkind folks used to say that the Shorts was "the box that the Dornier 328 came in!"
garritt
Love the fat boy short...looks like it just ate 3 little planes

CHRIS ROBEY
The Skyvan can carry a vehicle driven up the rear ramp.
Bob Plested
The Irish Concorde :)
ACTIVITY LOG
Want a full history search for N196WW dating back to 1998? Buy now. Get it within one hour.
Date Aircraft Origin Destination Departure Arrival Duration
12-Feb-2025 UnknownNear Riverside, CACoolidge Muni () First seen 10:01AM PST 12:41PM MST 1:40
11-Feb-2025 UnknownNear Riverside, CANear Riverside, CA First seen 04:03PM PST 04:16PM PST 0:13
11-Feb-2025 UnknownNear Riverside, CANear Riverside, CA First seen 03:27PM PST 03:43PM PST 0:15
11-Feb-2025 UnknownNear Riverside, CANear Riverside, CA First seen 02:50PM PST 03:06PM PST 0:15
11-Feb-2025 UnknownNear Riverside, CANear Riverside, CA First seen 02:12PM PST 02:30PM PST 0:17
11-Feb-2025 UnknownNear Riverside, CANear Riverside, CA First seen 01:29PM PST 01:44PM PST 0:15
11-Feb-2025 UnknownNear Riverside, CANear Riverside, CA First seen 01:05PM PST 01:15PM PST 0:09
11-Feb-2025 UnknownNear Riverside, CANear Riverside, CA First seen 12:31PM PST 12:41PM PST 0:09
11-Feb-2025 UnknownNear Riverside, CANear Riverside, CA First seen 09:39AM PST 09:50AM PST 0:10
11-Feb-2025 UnknownNear Riverside, CANear Riverside, CA First seen 09:17AM PST 09:29AM PST 0:11
11-Feb-2025 UnknownNear Riverside, CANear Riverside, CA First seen 08:42AM PST 08:52AM PST 0:10
11-Feb-2025 UnknownNear Riverside, CANear Riverside, CA First seen 07:53AM PST 08:15AM PST 0:22
10-Feb-2025 UnknownNear Riverside, CANear Riverside, CA First seen 03:23PM PST 03:34PM PST 0:10
10-Feb-2025 UnknownNear Riverside, CANear Riverside, CA First seen 02:45PM PST 02:55PM PST 0:10
10-Feb-2025 UnknownNear Riverside, CANear Riverside, CA First seen 02:21PM PST 02:35PM PST 0:14
10-Feb-2025 UnknownNear Riverside, CANear Riverside, CA First seen 01:34PM PST 01:48PM PST 0:13
10-Feb-2025 UnknownNear Riverside, CANear Riverside, CA First seen 12:54PM PST 01:08PM PST 0:14
10-Feb-2025 UnknownNear Riverside, CANear Riverside, CA First seen 11:39AM PST 11:59AM PST 0:20
10-Feb-2025 UnknownNear Riverside, CANear Riverside, CA First seen 11:13AM PST 11:33AM PST 0:19
10-Feb-2025 UnknownNear Riverside, CANear Riverside, CA First seen 10:53AM PST 11:05AM PST 0:12
10-Feb-2025 UnknownNear Riverside, CANear Riverside, CA First seen 10:26AM PST 10:39AM PST 0:13
10-Feb-2025 UnknownNear Riverside, CANear Riverside, CA First seen 10:02AM PST 10:18AM PST 0:15
10-Feb-2025 UnknownNear Riverside, CANear Riverside, CA First seen 09:37AM PST 09:51AM PST 0:13
10-Feb-2025 UnknownNear Riverside, CANear Riverside, CA First seen 09:18AM PST 09:29AM PST 0:10
10-Feb-2025 UnknownNear Riverside, CANear Riverside, CA First seen 08:53AM PST 09:07AM PST 0:14
10-Feb-2025 UnknownNear Riverside, CANear Riverside, CA First seen 08:34AM PST 08:44AM PST 0:09
10-Feb-2025 UnknownNear Riverside, CANear Riverside, CA First seen 08:12AM PST 08:27AM PST 0:15
10-Feb-2025 UnknownNear Riverside, CANear Riverside, CA First seen 07:42AM PST 07:58AM PST 0:15
09-Feb-2025 UnknownMarana Rgnl ()Near Riverside, CA 03:31PM MST 05:12PM PST 2:41
07-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 11:36AM MST 11:56AM MST 0:20
07-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 10:54AM MST 11:07AM MST 0:12
07-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 10:35AM MST 10:48AM MST 0:13
07-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 10:06AM MST 10:26AM MST 0:20
07-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 09:25AM MST 09:44AM MST 0:18
07-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 08:50AM MST 09:06AM MST 0:16
07-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 08:26AM MST 08:43AM MST 0:17
07-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 07:39AM MST 07:55AM MST 0:15
07-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 07:19AM MST 07:35AM MST 0:16
07-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 06:59AM MST 07:15AM MST 0:16
06-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 11:47AM MST 12:05PM MST 0:18
06-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 11:25AM MST 11:42AM MST 0:16
06-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 10:57AM MST 11:12AM MST 0:15
06-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 10:20AM MST 10:35AM MST 0:15
06-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 10:00AM MST 10:14AM MST 0:13
06-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 09:39AM MST 09:55AM MST 0:15
06-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 09:05AM MST 09:20AM MST 0:15
06-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 08:43AM MST 08:59AM MST 0:15
06-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 08:22AM MST 08:37AM MST 0:15
06-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 07:45AM MST 08:01AM MST 0:16
06-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 07:24AM MST 07:41AM MST 0:16
06-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 07:01AM MST 07:18AM MST 0:16
05-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 12:02PM MST 12:20PM MST 0:17
05-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 11:32AM MST 11:54AM MST 0:21
05-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 11:09AM MST 11:25AM MST 0:15
05-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 10:31AM MST 10:47AM MST 0:15
05-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 10:11AM MST 10:27AM MST 0:16
05-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 09:50AM MST 10:07AM MST 0:16
05-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 09:12AM MST 09:27AM MST 0:15
05-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 08:50AM MST 09:05AM MST 0:15
05-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 08:27AM MST 08:44AM MST 0:16
05-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 07:47AM MST 08:02AM MST 0:15
05-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 07:25AM MST 07:41AM MST 0:16
05-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 07:04AM MST 07:21AM MST 0:17
04-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 11:30AM MST 11:37AM MST 0:06
04-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 11:08AM MST 11:25AM MST 0:16
04-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 10:39AM MST 10:57AM MST 0:18
04-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 10:19AM MST 10:35AM MST 0:16
04-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 09:44AM MST 10:01AM MST 0:17
04-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 09:21AM MST 09:39AM MST 0:17
04-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 08:59AM MST 09:15AM MST 0:15
04-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 08:23AM MST 08:40AM MST 0:16
04-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 08:01AM MST 08:18AM MST 0:17
04-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 07:38AM MST 07:57AM MST 0:18
03-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 11:04AM MST 11:22AM MST 0:18
03-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 10:38AM MST 10:57AM MST 0:18
03-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 10:12AM MST 10:31AM MST 0:18
03-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 09:29AM MST 09:48AM MST 0:18
03-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 09:08AM MST 09:25AM MST 0:17
03-Feb-2025 UnknownMarana Rgnl ()Marana Rgnl () 08:39AM MST 08:59AM MST 0:19
03-Feb-2025 UnknownCoolidge Muni ()Marana Rgnl () 06:11AM MST 06:29AM MST 0:18
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