YS 140 DZ going lean in -ve g manoeuvres

[Karl G. Mueller]

Peter,

The DZ's do not like to have any amount of air in the fuel feed line.
It maybe that due to the weight of the clunk that at high G maneuvers
it hangs up on the bottom of the tank, especially if you are using fuel
tubing (Silicone) for the full length of the pick-up tube, and the clunk
is out of the fuel for just a split second. Just one of the things that can 
happen at high G maneuvers.

Karl G. Mueller
kgamueller at rogers.com

  ----- Original Message ----- 
  From: PENNISI Peter 
  To: discussion at nsrca.org 
  Sent: Wednesday, May 12, 2004 8:28 PM
  Subject: YS 140 DZ going lean in -ve g manoeuvres


  Hi all,


  My DZ has only returned from holidays in Japan were it was repaired by YS from another cam failure.


  The engine is running absolutely superb except when you pull high negative g manoeuvres like the reverse humpty bump it gets a little lean for a few seconds put it does come good.

  I have re-plumbed the model put the problem is still there. 

  Running

  APC 16 x 12
  OS F plug
  Tetra 20 oz tank with OS sintered(Spelling) bubble less pickup.(Yes the expensive one)
  Hatori exhaust (698 pipe)
  Coolpower 30% heli blend
  Model is ZN-LINE Alliance.

  Any suggestions


  Peter


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