daily pic

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Tlewis95 preflighting our "cracker" C172R G1000. One of the five of SIU's newest planes!
 
mccauleyprop said:
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Question for you... On other airplanes with PT-6's the prop always feathers on shut down as the oil drains from the hub or if you put the props in feather manually before you shut down. Why is it that I see some Twin Otters with their props in fine pitch? Are there pitch locks or something? What is the purpose of keeping them in fine pitch?
 
N519AT said:
Is that guy that you went to still doing it in the air cam? I would love to get my hands on one.
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I believe so. Haven't spoken to him in a few years though. PM me for his (possibly outdated) contact info.
 
N519AT said:
Question for you... On other airplanes with PT-6's the prop always feathers on shut down as the oil drains from the hub or if you put the props in feather manually before you shut down. Why is it that I see some Twin Otters with their props in fine pitch? Are there pitch locks or something? What is the purpose of keeping them in fine pitch?
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Part of the shut down procedure is to manually put the props in feather. If you don't they'll slowly go into feather after shut down, about 2-3 minutes, when the oil drains. There isn't a "prop lock" like you'd see on the seminole or similar light piston twins.
I fly dash 27's and 28's, same as the Twotters engines.
 
Nark said:
Part of the shut down procedure is to manually put the props in feather. If you don't they'll slowly go into feather after shut down, about 2-3 minutes, when the oil drains. There isn't a "prop lock" like you'd see on the seminole or similar light piston twins.
I fly dash 27's and 28's, same as the Twotters engines.
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Ahh, I was talking like the start latches like on the garretts, same principle I guess. In the King Air when we shut the engines down they would go to feather before the prop stopped turning if you didn't bring the prop levers back into feather. That was with -42's though. I wonder why they're so much slower to feather on the -27s & 28s.
 
They are a product of 1950, versus 1970s technology. I'm willing to bet the -42's have a few more compressor stages too. 27/28's have 3.

I looked on the website, and the "large" have 4 stages, and the "smalls" have 3 stages. I'm willing to bet the -42 is considered a large.
Also the 27's only have a few functions off of the P3 line, flame centering, anti ice and environmental.(ie just enough heat to keep me from turning into an ice cube.)
No pressurization to worry about.
 
N519AT said:
Question for you... On other airplanes with PT-6's the prop always feathers on shut down as the oil drains from the hub or if you put the props in feather manually before you shut down. Why is it that I see some Twin Otters with their props in fine pitch? Are there pitch locks or something? What is the purpose of keeping them in fine pitch?
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The seaplanes with PT6 engines often have start locks installed. The reason is that a feathered propeller will 'slap' the water and cause considerable erosion/ corrosion issues the propeller blades.
 
Just a few randoms from the past week...

One of my students solo-ing at KRNC/McMinville TN (aka Red Neck Country).
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KRNC, McMinville TNfrom the air.
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KMQY, Smyrna TN ASOS calling the field VFR... Yeah right...
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Enroute to KMEI, Meridian MS
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Dale Earnhearts ERJ parked out front at Smyrna Air Center.
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Approach into KPNS, Pensacola FL
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BeReal said:
Awesome. I know very little about photography. Do you get the effect of the steamy look of the water by time lapse? Very cool!
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Not a time lapse, but a long exposure with a graduated neutral density filter. Exposures were around 1.5 sec or so, to give the motion blur of the water.

The filter is basically like a sunglass lens that is tinted on top and clear on the bottom. That way the sun doesn't blow out the shot with the exposure time.
 
gne in prog said:
The filter is basically like a sunglass lens that is tinted on top and clear on the bottom. That way the sun doesn't blow out the shot with the exposure time.
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That's another thing I'm curious about. How, in the age of digital photography, do you prevent over-exposure when aiming into the sun and still get the kind of detail that you get? Is it the software in the camera? I think I know barely enough to question how you can shoot into a light source like a sunset and still retain such detail.
 
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