[NSRCA-discussion] YS 140DZ tuning question

[Bob Kane]

Hindsight is always 20/20. The motor quit once in four
flights the day before, but the wind was not nearly as
strong and I brought it back to within 20 feet of
where I was standing. On Sunday it quit in almost the
same position, but I did not anticipate how strong the
wind was up 100 or so feet. I got the plane turned and
pointed back toward the grass, but it slowed to the
point of stalling as I tried to make it back. I know
from exprience a controlled landing is better than
falling out of the sky, so I opted to let it land in
the rough rather than risk stalling it trying to
stretch the glide.

"Troy A. Newman" <troy_newman at msn.com> wrote:

> That was position not prostitution!
> 
> Spell checker going too fast
> 
> Troy
> ----- Original Message ----- 
> From: "Troy A. Newman" <troy_newman at msn.com>
> To: "NSRCA Mailing List"
> <nsrca-discussion at lists.nsrca.org>
> Sent: Monday, May 01, 2006 12:53 PM
> Subject: Re: [NSRCA-discussion] YS 140DZ tuning
> question
> 
> 
> > I would recommend leaning the HS a few clicks and
> try it out and see if 
> > its too lean. If its not too lean then fly it and
> see.
> >
> > The DZ motors run in a leaner spot of the HS than
> an pressurized version 
> > will. Yes it will make great gobs of MOE rich but
> it will not idle well if 
> > its too rich and it will shake bad too. Just lean
> it down a bit and see 
> > where it wants to be. I usually end up with a
> fairly new motor about 
> > 1.25turns out. You are a little further away and
> most like 1/4 turn on the 
> > needle will solve the problem for you.
> >
> > Basically a good rule of thumb on any motor is to
> not be a prostitution 
> > where if it quits right now you can't make it
> back. I guess you learned 
> > that one this time.
> >
> >
> > Troy
> > ----- Original Message ----- 
> > From: "Troy A. Newman" <troy_newman at msn.com>
> > To: "NSRCA Mailing List"
> <nsrca-discussion at lists.nsrca.org>
> > Sent: Monday, May 01, 2006 12:42 PM
> > Subject: Re: [NSRCA-discussion] YS 140DZ tuning
> question
> >
> >
> >> 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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Bob Kane
getterflash at yahoo.com

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