[NSRCA-discussion] YS 140DZ tuning question

[Troy A. Newman]

Bob,

too rich...most likely on the HS...but could be too much pressure out of the 
pump.

Its no longer a pressure regulator its a pump. This is common when the HS is 
too rich...the raw fuel is dumped into the head of the engine and puts the 
fire out.

Troy
----- Original Message ----- 
From: "Bob Kane" <getterflash at yahoo.com>
To: <nsrca-discussion at lists.nsrca.org>
Sent: Monday, May 01, 2006 10:50 AM
Subject: [NSRCA-discussion] YS 140DZ tuning question


> You may have seen my previous post about replacement
> landing gear for my Temptation which were broken by a
> "landing" in a farmers field after an untimely
> deadstick.
>
> I could use some DZ tuning guidance. I'm pretty good
> at setting up the FZ/L series, but this experience
> does not help much with the DZ.  The deadstick occured
> on a downline after testing the vertical performance.
> I pulled the plane vertical and rolled on the throtle,
> it rocketed straight up. Satisfied with the ample
> vertical performance, I rolled the throttle back and
> did a sloppy wingover to get the plane pointed back
> down. I pulled back to horizontal and rolled the
> throtle up to about 1/2 and watched in shock as the
> prop slowed and stopped. You know the rest of this
> story.
>
> Is this a symptom of too rich, too lean, bad plug or?
> The needle was open 1 5/8 turns, which seemd to be
> good on the ground. I was running PowerMaster 20% DZ
> blend, Mejzlik 16X12 prop, OS F plug. The tank is on
> the CG, YS foam clunk, no header tank. The vent line
> has a check valve to keep fuel from leaking out.  My
> plan right now is to bench run the engine to see if I
> can figure out the needle sweet spot, but I know
> performance in the air can vary. Any help is
> appreciated.
>
> Bob Kane
> getterflash at yahoo.com
>
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