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


Short visit to CYHU, 21-08-2020.


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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.
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???
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!
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.
Bob Plested
The Irish Concorde :)
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
29-Sep-2023 UnknownSkylark ()Coolidge Muni () 02:38PM PDT 04:28PM MST 1:50
29-Sep-2023 UnknownBrown Fld Muni ()Skylark () 01:17PM PDT 02:01PM PDT 0:43
29-Sep-2023 UnknownSkylark ()Brown Fld Muni () 10:17AM PDT 10:54AM PDT 0:36
28-Sep-2023 UnknownSkylark ()Skylark () 11:46AM PDT 03:43PM PDT 3:57
28-Sep-2023 UnknownSkylark ()Skylark () 09:50AM PDT 10:41AM PDT 0:51
28-Sep-2023 UnknownSkylark ()Skylark () 08:16AM PDT 08:47AM PDT 0:30
27-Sep-2023 UnknownSkylark ()Skylark () 02:40PM PDT 03:53PM PDT 1:12
27-Sep-2023 UnknownSkylark ()Skylark () 12:16PM PDT 02:30PM PDT 2:13
27-Sep-2023 UnknownSkylark ()Skylark () 11:02AM PDT 11:39AM PDT 0:37
27-Sep-2023 UnknownSkylark ()Skylark () 09:35AM PDT 10:19AM PDT 0:43
27-Sep-2023 UnknownSkylark ()Skylark () 08:04AM PDT 08:38AM PDT 0:34
26-Sep-2023 UnknownSkylark ()Skylark () 01:35PM PDT 02:51PM PDT 1:15
26-Sep-2023 UnknownSkylark ()Skylark () 10:53AM PDT 11:46AM PDT 0:53
26-Sep-2023 UnknownSkylark ()Skylark () 09:26AM PDT 10:19AM PDT 0:52
26-Sep-2023 UnknownSkylark ()Skylark () 08:14AM PDT 08:50AM PDT 0:35
25-Sep-2023 UnknownSkylark ()Skylark () 01:26PM PDT 02:31PM PDT 1:04
25-Sep-2023 UnknownSkylark ()Skylark () 11:18AM PDT 12:26PM PDT 1:07
25-Sep-2023 UnknownSkylark ()Skylark () 09:13AM PDT 10:26AM PDT 1:12
22-Sep-2023 UnknownBrown Fld Muni ()Skylark () 11:18AM PDT 12:07PM PDT 0:48
22-Sep-2023 UnknownSkylark ()Brown Fld Muni () 09:55AM PDT 10:35AM PDT 0:40
21-Sep-2023 UnknownSkylark ()Skylark () 01:41PM PDT 04:10PM PDT 2:28
21-Sep-2023 UnknownSkylark ()Skylark () 11:30AM PDT 01:06PM PDT 1:36
20-Sep-2023 UnknownSkylark ()Skylark () 11:54AM PDT 03:02PM PDT 3:08
20-Sep-2023 UnknownSkylark ()Skylark () 09:47AM PDT 10:52AM PDT 1:05
19-Sep-2023 UnknownSkylark ()Skylark () 03:45PM PDT 04:05PM PDT 0:19
19-Sep-2023 UnknownSkylark ()Skylark () 11:28AM PDT 03:12PM PDT 3:43
19-Sep-2023 UnknownSkylark ()Skylark () 09:28AM PDT 10:35AM PDT 1:06
18-Sep-2023 UnknownSkylark ()Skylark () 04:05PM PDT 05:59PM PDT 1:54
18-Sep-2023 UnknownSkylark ()Skylark () 02:24PM PDT 03:23PM PDT 0:59
18-Sep-2023 UnknownSkylark ()Skylark () 12:08PM PDT 01:17PM PDT 1:09
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