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Very Strange PT-6 Exhaust  
User currently offline2H4 From United States of America, joined Oct 2004, 8955 posts, RR: 60
Posted (7 years 5 months 1 week 4 days 3 hours ago) and read 3845 times:
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So I ran across these photos of a Caravan:


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Photo © Michael Durning
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Photo © Peter Stuhlmann - CYOW Airport Watch



...and I can't figure out why the exhaust has been extended. Here's a shot of the same aircraft with the standard exhaust:


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Photo © Jean-Luc Poliquin



If anyone knows the purpose of this mod, I'd love to hear it.


2H4





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25 replies: All unread, showing first 25:
 
User currently offlineZANL188 From United States of America, joined Oct 2006, 3526 posts, RR: 0
Reply 1, posted (7 years 5 months 1 week 4 days 3 hours ago) and read 3840 times:
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I'll hazard a guess and say the exhaust was interfering with a sensor or was being recirculated into the cabin thru what appears to be a large opening in the fuselage bottom.


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User currently offlineKELPkid From United States of America, joined Nov 2005, 6397 posts, RR: 3
Reply 2, posted (7 years 5 months 1 week 4 days 3 hours ago) and read 3834 times:

Quoting ZANL188 (Reply 1):
or was being recirculated into the cabin thru what appears to be a large opening in the fuselage bottom.


 checkmark 

I'll second that vote...I wonder why the Mounties need a large trap door in the floor? Did they get the plane from the department of fish & wildlife, who used it for re-stocking lakes and streams?  confused 



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User currently offlineLowrider From United States of America, joined Jun 2004, 3220 posts, RR: 10
Reply 3, posted (7 years 5 months 1 week 4 days 2 hours ago) and read 3825 times:

Quoting ZANL188 (Reply 1):
I'll hazard a guess and say the exhaust was interfering with a sensor or was being recirculated into the cabin thru what appears to be a large opening in the fuselage bottom.

Since this is the case in other aircraft, I assume it is here, too. All that hot exhaust could screw up an IR picture.



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User currently offlineKELPkid From United States of America, joined Nov 2005, 6397 posts, RR: 3
Reply 4, posted (7 years 5 months 1 week 4 days 2 hours ago) and read 3814 times:

Quoting Lowrider (Reply 3):
Since this is the case in other aircraft, I assume it is here, too. All that hot exhaust could screw up an IR picture.

However, most law enforcement aircraft that I've seen equipped with a FLIR (Forward-looking Infrared) system use a pod with a dome that houses a camera that swivels on a gimbal...sure it knocks a few knots off the top cruise, but it works. I wonder if that's what's behind trapdoor #1  Smile



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User currently offline2H4 From United States of America, joined Oct 2004, 8955 posts, RR: 60
Reply 5, posted (7 years 5 months 1 week 4 days 2 hours ago) and read 3809 times:
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Thanks for the input, guys. Good stuff.

Quoting KELPkid (Reply 2):
Did they get the plane from the department of fish & wildlife, who used it for re-stocking lakes and streams?

Actually, I think it was originally used for tactical flannel drops and Molson replenishment in remote locations.  Wink


2H4





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User currently offlineKELPkid From United States of America, joined Nov 2005, 6397 posts, RR: 3
Reply 6, posted (7 years 5 months 1 week 4 days 2 hours ago) and read 3803 times:

Quoting 2H4 (Reply 5):
Actually, I think it was originally used for tactical flannel drops and Molson replenishment in remote locations. Wink


2H4

Or maybe it was the aircraft used to drop Dudley Dooright into the backwards-facing position on his faithful horse, Faithful Horse  duck 



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User currently offlineN231YE From , joined Dec 1969, posts, RR:
Reply 7, posted (7 years 5 months 1 week 4 days 2 hours ago) and read 3801 times:

Could be for an aerial photography company (exhaust gasses produce that "heat blur," a no-no in professional photographs of the ground).

There is an aerial-photography company based at my university's airport, and all of their C172's have a weird looking exhaust stack extension that empties at the pilot's side of the a/c, further than the rear window.

Tomorrow, when I am out at the flight line, I will try to get a photo of one of these aircraft.


User currently offlineKELPkid From United States of America, joined Nov 2005, 6397 posts, RR: 3
Reply 8, posted (7 years 5 months 1 week 4 days 2 hours ago) and read 3801 times:

Quoting N231YE (Reply 7):
Could be for an aerial photography company (exhaust gasses produce that "heat blur," a no-no in professional photographs of the ground).

Do the Mounties (Royal Canadian Mounted Police) regularly engage in aerial photography?



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User currently offlineN231YE From , joined Dec 1969, posts, RR:
Reply 9, posted (7 years 5 months 1 week 4 days 2 hours ago) and read 3792 times:

Quoting KELPkid (Reply 8):
Do the Mounties (Royal Canadian Mounted Police) regularly engage in aerial photography?

Maybe to make sure that the United States military isn't secretly mobilizing to invade Canada?  mischievous 


User currently offlineZANL188 From United States of America, joined Oct 2006, 3526 posts, RR: 0
Reply 10, posted (7 years 5 months 1 week 4 days 2 hours ago) and read 3784 times:
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Quoting KELPkid (Reply 2):
I wonder why the Mounties need a large trap door in the floor?

Maybe...

A large format camera..

Lidar

Mysterious WMD sensor



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User currently offlineKELPkid From United States of America, joined Nov 2005, 6397 posts, RR: 3
Reply 11, posted (7 years 5 months 1 week 4 days 2 hours ago) and read 3774 times:

Quoting ZANL188 (Reply 10):

Mysterious WMD sensor

Or the deployment thereof...  Wink Maybe it's for the planned Canadian invasion of the USA (and we're not talking Celene Dion or Rick Moranis here...)  Smile



Celebrating the birth of KELPkidJR on August 5, 2009 :-)
User currently offlineZANL188 From United States of America, joined Oct 2006, 3526 posts, RR: 0
Reply 12, posted (7 years 5 months 1 week 4 days 1 hour ago) and read 3755 times:
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Quoting KELPkid (Reply 11):
planned

"planned"? Alex Trebek, Paul Shafer, and William Shatner are already here...  Smile



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User currently offlineUscgc130 From , joined Dec 1969, posts, RR:
Reply 13, posted (7 years 5 months 1 week 4 days 1 hour ago) and read 3751 times:

Is the Caravan the only PT6-powered aircraft that uses an under-fuselage exhaust instead of those lateral "horns," as on King Airs and T-34Cs?

I read an article in one of the avgeek magazines a year or so ago about the owner of a gorgeous Caravan on amphibious floats, and how he uses the plane for both business and pleasure. The Caravan's exhaust is mounted at a slight angle, and he takes advantage of this when taxiing up to a dock. He'll place the prop in flat pitch and wind up the engine; the thrust from the exhaust will provide enough of a lateral vector to move the plane sideways to the left. Nifty.


User currently offlineLowrider From United States of America, joined Jun 2004, 3220 posts, RR: 10
Reply 14, posted (7 years 5 months 1 week 4 days ago) and read 3726 times:

Quoting KELPkid (Reply 4):
However, most law enforcement aircraft that I've seen equipped with a FLIR (Forward-looking Infrared) system use a pod with a dome that houses a camera that swivels on a gimbal...sure it knocks a few knots off the top cruise, but it works.

That works great for tactical "live" situations, but developing a large scale IR map of an area has its uses. For example it is one method to locate drug operations.

Quoting 2H4 (Reply 5):
Actually, I think it was originally used for tactical flannel drops and Molson replenishment in remote locations.

You know, if we went up there and got cases of the good Molson, then drop it after we cross the border, before we clear customs, and use a GPS to go back to it later...



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User currently offline2H4 From United States of America, joined Oct 2004, 8955 posts, RR: 60
Reply 15, posted (7 years 5 months 1 week 4 days ago) and read 3725 times:
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Quoting Uscgc130 (Reply 13):
Is the Caravan the only PT6-powered aircraft that uses an under-fuselage exhaust instead of those lateral "horns," as on King Airs and T-34Cs?

With the obvious exception of helicopters, I think that's correct. The Dash-7 and Basler BT-67 have exhaust mounted on top of the nacelles. The Piper Cheyenne 400 and Casa C-212 have rear-mounted exhaust. The Caravan, however, appears to be the only one that utilizes a single under-fuselage exhaust.

Quoting Uscgc130 (Reply 13):
He'll place the prop in flat pitch and wind up the engine; the thrust from the exhaust will provide enough of a lateral vector to move the plane sideways to the left.

That's great.  biggrin 


2H4





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User currently offlineL-188 From United States of America, joined Jul 1999, 29802 posts, RR: 58
Reply 16, posted (7 years 5 months 1 week 3 days 23 hours ago) and read 3721 times:

Quoting 2H4 (Reply 15):
The Piper Cheyenne 400 and Casa C-212 have rear-mounted exhaust.

Both those aircraft are also powered by TPE-331's not PT-6's.

As far as the pipe, don't know but I bet it works great for keeping soot stains off the airplane.



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User currently offline2H4 From United States of America, joined Oct 2004, 8955 posts, RR: 60
Reply 17, posted (7 years 5 months 1 week 3 days 23 hours ago) and read 3710 times:
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Quoting L-188 (Reply 16):
Both those aircraft are also powered by TPE-331's not PT-6's.

Blast. You're right. I was thinking of the -300P variant of the 212, which has the PT6A-65s, and I think I got the Cheyenne III and 400 mixed up. Clearly, it's time for bed.


2H4





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User currently offlineZeke From Hong Kong, joined Dec 2006, 9111 posts, RR: 75
Reply 18, posted (7 years 5 months 1 week 3 days 15 hours ago) and read 3634 times:

Quoting Lowrider (Reply 14):

That works great for tactical "live" situations, but developing a large scale IR map of an area has its uses. For example it is one method to locate drug operations.

Exactly what is would be for, IR photos are good for finding drugs in a forest or for taking high altitude photos of a fire.



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User currently offlineKELPkid From United States of America, joined Nov 2005, 6397 posts, RR: 3
Reply 19, posted (7 years 5 months 1 week 3 days 2 hours ago) and read 3483 times:

Quoting Lowrider (Reply 14):
You know, if we went up there and got cases of the good Molson, then drop it after we cross the border, before we clear customs, and use a GPS to go back to it later...

Yeah, then we could call you D. "Beer" Cooper Big grin

Beaut, eh?  Wink My apologies to the forum members from the Great White North...



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User currently offlineLowrider From United States of America, joined Jun 2004, 3220 posts, RR: 10
Reply 20, posted (7 years 5 months 1 week 2 days 23 hours ago) and read 3432 times:

Quoting KELPkid (Reply 19):
Beaut, eh?

Careful, the punishment for such offenses is death, by Celine Dion.



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User currently offlineLJ35 From Canada, joined Nov 2006, 21 posts, RR: 0
Reply 21, posted (7 years 5 months 1 week 2 days 18 hours ago) and read 3402 times:

To answer 2H4's question,the extended exhaust pipe is only mounted on this plane when the FLIR is in place.If you look at the first photo attached(select the large format)the FLIR is mounted underneath the port wing directly on the "U" in the aircraft registration(it is black in colour).In case your wondering why I know this,I fuel this aircraft on a daily basis given that it is based at CYOW(Ottawa,Ontario).The other cool thing about this Caravan and the other 2 that the RCMP operate is that they are configured for single point refuelling in addition to the standard overwing method.The single point hook-up is located port side right behind the main gear.Interesting fact about the single point fuelling system on this aircraft is that it won't completely fill the tanks(about an hour's less flying time when fully fuelled via the single point method).This system has been a godsend when they show up with their amphib caravan once in a while.

User currently offlineKELPkid From United States of America, joined Nov 2005, 6397 posts, RR: 3
Reply 22, posted (7 years 5 months 1 week 2 days 12 hours ago) and read 3357 times:

Quoting LJ35 (Reply 21):
To answer 2H4's question,the extended exhaust pipe is only mounted on this plane when the FLIR is in place.If you look at the first photo attached(select the large format)the FLIR is mounted underneath the port wing directly on the "U" in the aircraft registration(it is black in colour).

Do you know anything about the mysterious trap door on the bottom of the fuselage, and why that's there?  Smile



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User currently offlineAirfoilsguy From , joined Dec 1969, posts, RR:
Reply 23, posted (7 years 5 months 1 week 2 days 8 hours ago) and read 3306 times:

Would the extension cut down on some of the noise inside the cabin? Also, what kind of performance penaltys does this aircraft experience when the extension is mounted.

User currently offlineFLY2HMO From , joined Dec 1969, posts, RR:
Reply 24, posted (7 years 5 months 1 week 2 days ago) and read 3237 times:

OK guys seriously you're all thinking WAY too deep into this.  sarcastic 

That's the test plane Flowmaster just started using for inflight tests for their new aircraft sport exhaust line. Big grin

 duck 


User currently offline2H4 From United States of America, joined Oct 2004, 8955 posts, RR: 60
Reply 25, posted (7 years 5 months 1 week 1 day 23 hours ago) and read 3225 times:
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Quoting FLY2HMO (Reply 24):
That's the test plane Flowmaster just started using for inflight tests for their new aircraft sport exhaust line.

Not shown are the "Trucknutz" hanging between the gear legs:










2H4





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