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Exhaust smells in the cockpit

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Fergus Kyle

Joined: 03 Jun 2007
Posts: 291
Location: Burlington ON Canada

Posted: Sun Apr 13, 2008 9:56 am Post subject: Exhaust smells in the cockpit

Cheers,  

        There was a flurry of discussion when the fillets took interest, which mentioned ingestion of exhaust through the flap slots due to various configurations of flap (and earlier talk of CO through the wheel slot, etc.) – and it may be so. The reason could be that the cockpit area is of too low a pressure to prevent ingestion.     

        Remembering the DC9’s system, it was then clear to me that a pressurized cabin prevented such antics – and so have tried to arrange that the cockpit be ‘over-fed’ with outside air and both temp and flow be controlled by the exit. It then would seem wise to organise larger than normal hot AND cold influx, adjust the ratio of each for comfort and control the total flow by outlet valve. Whether I achieve this is another thing.  

Happy landings  

Ferg     [quote][b]

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craigb(at)onthenet.com.au
Guest

Posted: Sun Apr 13, 2008 12:25 pm Post subject: Exhaust smells in the cockpit

might  need those extra door latches, also what how you done or planned for your static  air, wouldnt the slight pressure increase in the cabin

 do  screwy things to ALT VSI ASI etc, given you would have trouble maintaining a  "constant" differential with the outside pressure

  

 craig

 [quote]   --

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grahamsingleton(at)btinte
Guest

Posted: Sun Apr 13, 2008 12:56 pm Post subject: Exhaust smells in the cockpit

No, static air pressure is measured out near the ailerons, or should be ?

Graham



craig bastin wrote:

  wouldnt the slight pressure increase in the cabin

 	  Quote: 	
		   do screwy things to ALT VSI ASI etc, given you would have trouble 

 maintaining a "constant" differential with the outside pressure

  

 craig

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kheindl(at)msn.com
Guest

Posted: Sun Apr 13, 2008 1:02 pm Post subject: Exhaust smells in the cockpit

I think some people make a mountain out of a molehill again. I can smell exhaust fumes with full flaps on final. So what ? My CO meter registers 0 at all times, and in any case, it only lasts a few seconds.

  

 Karl

  

 



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 [quote]  From: VE3LVO(at)rac.ca

To: europa-list(at)matronics.com

Subject: Europa-List: Exhaust smells in the cockpit

Date: Sun, 13 Apr 2008 13:52:38 -0400



  

Cheers, 

      � There was a flurry of discussion when the fillets took interest, which mentioned ingestion of exhaust through the flap slots due to various configurations of flap (and earlier talk of CO through the wheel slot, etc.) � and it may be so. The reason could be that the cockpit area is of too low a pressure to prevent ingestion.�   

      � Remembering the DC9�s system, it was then clear to me that a pressurized cabin prevented such antics � and so have tried to arrange that the cockpit be �over-fed� with outside air and both temp and flow be controlled by the exit. It then would seem wise to organise larger than normal hot AND cold influx, adjust the ratio of each for comfort and control the total flow by outlet valve. Whether I achieve this is another thing. 

Happy landings 

Ferg 	  Quote: 	
		  



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[b]

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cptimm(at)telus.net
Guest

Posted: Sun Apr 13, 2008 1:16 pm Post subject: Exhaust smells in the cockpit

Fergus,  you are so right. The high pressure  air from under the wing is forced into the rear fuselage through the slot of the  flap-tube. This makes it impossible to drain any air from the cock-pit area out  through the tail-section. I had 5 holes of 1" diameter drilled through the  D-section, before covering it with fabric, which only got exhaust fumes to the  cock-pit from the rear!.I am now in the process of sealing the lower  flap-to-fuselage junction completely with small, shaped tabs of flexible  fiber-glass and tape to be pressed against the fuselage along the under side of  the flaps. This should also stop the outward bulging of the doors at higher  speeds. Fairings attached to the main-wheel swinging arm as well as to the  fuselage behind the wheel are nearly finished and should provide a much better  seal to the wheel-well, which has to be a main source of drag as well. I should  be able to report the results shortly.

  

 Regards

  

 Peter Timm, # 110

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