47 Votes (4.74 Average) and 7,632 Views  

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
20-Feb-2024 UnknownEl Tiro ()El Tiro () 02:02PM MST 02:17PM MST 0:15
20-Feb-2024 UnknownEl Tiro ()El Tiro () 01:25PM MST 01:56PM MST 0:31
20-Feb-2024 UnknownEl Tiro ()El Tiro () 12:56PM MST 01:09PM MST 0:13
20-Feb-2024 UnknownEl Tiro ()El Tiro () 11:30AM MST 11:45AM MST 0:14
20-Feb-2024 UnknownEl Tiro ()El Tiro () 10:31AM MST 11:25AM MST 0:54
20-Feb-2024 UnknownEl Tiro ()El Tiro () 09:30AM MST 09:46AM MST 0:15
20-Feb-2024 UnknownEl Tiro ()El Tiro () 08:55AM MST 09:10AM MST 0:15
20-Feb-2024 UnknownEl Tiro ()El Tiro () 08:10AM MST 08:27AM MST 0:17
19-Feb-2024 UnknownEl Tiro ()El Tiro () 11:49AM MST 12:06PM MST 0:16
19-Feb-2024 UnknownEl Tiro ()El Tiro () 11:29AM MST 11:45AM MST 0:15
19-Feb-2024 UnknownEl Tiro ()El Tiro () 10:42AM MST 10:59AM MST 0:17
19-Feb-2024 UnknownEl Tiro ()El Tiro () 10:21AM MST 10:38AM MST 0:16
19-Feb-2024 UnknownEl Tiro ()El Tiro () 09:33AM MST 09:50AM MST 0:17
19-Feb-2024 UnknownEl Tiro ()El Tiro () 09:10AM MST 09:29AM MST 0:18
16-Feb-2024 UnknownEl Tiro ()El Tiro () 11:38AM MST 11:57AM MST 0:18
16-Feb-2024 UnknownEl Tiro ()El Tiro () 10:23AM MST 10:45AM MST 0:22
16-Feb-2024 UnknownEl Tiro ()El Tiro () 08:39AM MST 09:02AM MST 0:23
15-Feb-2024 UnknownEl Tiro ()El Tiro () 01:01PM MST 01:40PM MST 0:39
15-Feb-2024 UnknownEl Tiro ()El Tiro () 11:54AM MST 12:32PM MST 0:38
15-Feb-2024 UnknownEl Tiro ()El Tiro () 10:47AM MST 11:28AM MST 0:41
15-Feb-2024 UnknownEl Tiro ()El Tiro () 09:31AM MST 10:17AM MST 0:46
15-Feb-2024 UnknownEl Tiro ()El Tiro () 08:16AM MST 08:57AM MST 0:40
14-Feb-2024 UnknownEl Tiro ()El Tiro () 02:51PM MST 03:21PM MST 0:29
14-Feb-2024 UnknownEl Tiro ()El Tiro () 01:28PM MST 02:08PM MST 0:39
14-Feb-2024 UnknownEl Tiro ()El Tiro () 12:10PM MST 12:51PM MST 0:41
14-Feb-2024 UnknownEl Tiro ()El Tiro () 11:11AM MST 11:30AM MST 0:19
14-Feb-2024 UnknownEl Tiro ()El Tiro () 10:49AM MST 11:07AM MST 0:18
14-Feb-2024 UnknownEl Tiro ()El Tiro () 09:32AM MST 10:15AM MST 0:42
13-Feb-2024 UnknownEl Tiro ()El Tiro () 02:24PM MST 03:06PM MST 0:42
13-Feb-2024 UnknownEl Tiro ()El Tiro () 01:13PM MST 01:54PM MST 0:41
13-Feb-2024 UnknownEl Tiro ()El Tiro () 12:00PM MST 12:41PM MST 0:41
13-Feb-2024 UnknownEl Tiro ()El Tiro () 10:49AM MST 11:38AM MST 0:48
13-Feb-2024 UnknownEl Tiro ()El Tiro () 09:18AM MST 10:19AM MST 1:01
12-Feb-2024 UnknownEl Tiro ()El Tiro () 01:50PM MST 02:44PM MST 0:53
12-Feb-2024 UnknownEl Tiro ()El Tiro () 11:48AM MST 12:48PM MST 1:00
12-Feb-2024 UnknownEl Tiro ()El Tiro () 09:52AM MST 11:12AM MST 1:19
12-Feb-2024 UnknownCoolidge Muni ()El Tiro () 08:41AM MST 08:56AM MST 0:14
08-Feb-2024 UnknownEloy Muni ()Coolidge Muni () 08:46AM MST 09:26AM MST 0:40
08-Feb-2024 UnknownEloy Muni ()Eloy Muni () 08:46AM MST Diverted
08-Feb-2024 UnknownCoolidge Muni ()Eloy Muni () 07:17AM MST 07:51AM MST 0:34
Basic users (becoming a basic user is free and easy!) view 3 months history. Join
 

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