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CJ Aux FuelCJ Aux Fuel

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UFO

Joined: 29 Jul 2007
Posts: 18
Location: Salt Lake City , Utah

Posted: Tue Mar 25, 2008 7:04 am Post subject: CJ Aux FuelCJ Aux Fuel

Gill, Brian, and List,

  

 I had Bill Blackwell install bladder tanks on  my Nanchang (formerly Jeff Linebaugh's) over two years ago.   M14-P engine.  No new fuel gauges.  Right now the old gauges have to  burn down to 60 litres before they start indicating, but I can calculate  time/burn and live with that. Bill did mention the caution of not having too  much OR too little fuel in the tanks when doing aerobatics.  He was  concerned that too little during certain manuvers might cause fuel  starvation,  but that would likely be true of any tank system wouldn't  it?  Thus far no problems other than an as yet  unidentified  tendency to burn more out of the left tank than the right.   The  aerobatics have been relatively tame (except when Ranger turns us  inside-out in his attempts to make me an idiot-proof aerobatic pilot).  I  haven't spent as much time reviewing the Yak List as I used to.  Any  suggestions on why I might be having this tendency to burn more out of the left  than right?  I did have my mechanics thoroughly check out the system during  its recent annual and they found nothing amiss.  Playing with the vent  system doesn't seem to help and I do notice a suction when I open the fuel cap  to refill at times.  Maybe I need to find more airports with left  traffic patterns for my touch-and-gos.

  

 Thanks guys,

  

 Valkyrie 

   [quote][b]

_________________
"Pilots take no special joy in walking, pilots like flying." - Neil Armstrong

wlannon(at)persona.ca
Guest

Posted: Tue Mar 25, 2008 8:39 am Post subject: CJ Aux FuelCJ Aux Fuel

[quote] ---

cjpilot710(at)aol.com
Guest

Posted: Tue Mar 25, 2008 9:46 am Post subject: CJ Aux FuelCJ Aux Fuel

In a message dated 3/25/2008 12:40:34 P.M. Eastern Daylight Time,  wlannon(at)persona.ca writes:

  

 This problem has been with the CJ-6 since it was prototype.  It is the  same problem that (either A or B) model of the T-34 that has basically the  same fuel system. (Hmmmm does that mean the CJ-6 a copy of the T-34?).  The  T-34 guys (and me too) have found that yaw trim is the problem. They can  change tank feed by applying rudder trim one way or the other.  Changing  from standard tanks to bladder tanks with separated tanks vents didn't change  the problem for me at all.

  

 Pappy

 [quote]    

   [quote]     ---

brian-1927(at)lloyd.com
Guest

Posted: Tue Mar 25, 2008 1:00 pm Post subject: CJ Aux FuelCJ Aux Fuel

On Mar 25, 2008, at 10:40 AM, cjpilot710(at)aol.com wrote:

 	  Quote: 	
		   In a message dated 3/25/2008 12:40:34 P.M. Eastern Daylight Time, wlannon(at)persona.ca 

  writes:



 This problem has been with the CJ-6 since it was prototype.  It is  

 the same problem that (either A or B) model of the T-34 that has  

 basically the same fuel system. (Hmmmm does that mean the CJ-6 a  

 copy of the T-34?).  The T-34 guys (and me too) have found that yaw  

 trim is the problem. They can change tank feed by applying rudder  

 trim one way or the other.  Changing from standard tanks to bladder  

 tanks with separated tanks vents didn't change the problem for me at  

 all.


	


In fact, without a means to prevent fuel from flowing back out to the  

other tank, having two vents can force fuel from one tank to the other  

by virtue of differential vent pressure. This is why Cessnas have a  

single tank vent.



(If you get a chance, go look at the evolution of the Cessna fuel  

system over time. This has been an ongoing problem with any Cessna  

that has a "both" fuel selector position.)



--

Brian Lloyd                         3191 Western Drive

brian HYPHEN 1927 AT lloyd DOT com    Cameron Park, CA 95682

+1.916.367.2131 (voice)             +1.270.912.0788 (fax)



I fly because it releases my mind from the tyranny of petty things . . .

— Antoine de Saint-Exupéry



PGP key ID:          12095C52A32A1B6C

PGP key fingerprint: 3B1D BA11 4913 3254 B6E0  CC09 1209 5C52 A32A 1B6C

wlannon(at)persona.ca
Guest

Posted: Tue Mar 25, 2008 8:35 pm Post subject: CJ Aux FuelCJ Aux Fuel

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wlannon(at)persona.ca
Guest

Posted: Tue Mar 25, 2008 8:49 pm Post subject: CJ Aux FuelCJ Aux Fuel

Correction to my last post. Did the proof reading  AFTER I hit send --Again!

  

 Referred, at least twice, to the Header tank  non-return check valve as a vent valve. It is not.

  

 Walt

cjpilot710(at)aol.com
Guest

Posted: Wed Mar 26, 2008 4:53 am Post subject: CJ Aux FuelCJ Aux Fuel

In a message dated 3/26/2008 12:38:06 A.M. Eastern Daylight Time,  wlannon(at)persona.ca writes:

  

 Walt,

 To me this observation makes sense.  My CJ- is a 69.  

  

 Do you recollect what years you might have seen the "improved" ones  on?

  

 It looks like you did a nice grinding job.  How did you do it?

  

 This has always been a little annoying and usually the only thing that  spoils a perfect flight.

  

 JIm "Pappy" Goosby

  

 [quote]

---

brian-1927(at)lloyd.com
Guest

Posted: Wed Mar 26, 2008 5:08 am Post subject: CJ Aux FuelCJ Aux Fuel

On Mar 25, 2008, at 9:32 PM, Walter Lannon wrote:



[quote]

 ---

brian-1927(at)lloyd.com
Guest

Posted: Wed Mar 26, 2008 5:09 am Post subject: CJ Aux FuelCJ Aux Fuel

On Mar 25, 2008, at 9:47 PM, Walter Lannon wrote:

 	  Quote: 	
		   Correction to my last post. Did the proof reading AFTER I hit send -- 

 Again!



 Referred, at least twice, to the Header tank non-return check valve  

 as a vent valve. It is not.


	


Ah, now I am not confused. Thanks.

 	  Quote: 	
		  

 Walt


	


--

Brian Lloyd                         3191 Western Drive

brian HYPHEN 1927 AT lloyd DOT com    Cameron Park, CA 95682

+1.916.367.2131 (voice)             +1.270.912.0788 (fax)



I fly because it releases my mind from the tyranny of petty things . . .

— Antoine de Saint-Exupéry



PGP key ID:          12095C52A32A1B6C

PGP key fingerprint: 3B1D BA11 4913 3254 B6E0  CC09 1209 5C52 A32A 1B6C

wlannon(at)persona.ca
Guest

Posted: Wed Mar 26, 2008 8:03 am Post subject: CJ Aux FuelCJ Aux Fuel

Jim;

  

 69 and previous have the original valve.

  

 The only later one I have seen was via photo from Richard Broome in South  Africa. Richard what year is your CJ??

  

 Thanks. Hand file.

  

 Cheers;

 Walt

 [quote]   ---

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