[NSRCA-discussion] YS-160 setting

[JShulman]

What prop? And that's in that thin, dry air.

Regards,
Jason
www.jasonshulman.com
www.shulmanaviation.com
www.composite-arf.com

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Troy A. Newman
Sent: Thursday, March 08, 2007 10:57 PM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] YS-160 setting


By the way on my Astral XXc I'm getting 14-15 mins out of a 20oz tank. I can
fly a complete P and Complete F. If I try 2 P's I get to the loops and it
gets an air bubble....

Troy
----- Original Message -----
From: "JShulman" <jshulman at cfl.rr.com>
To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
Sent: Thursday, March 08, 2007 8:44 PM
Subject: Re: [NSRCA-discussion] YS-160 setting


> Thanks Troy for my answer. Hope everyone out there got what they needed
> out
> of that detailed part before the answer ;) I'll report back tomorrow. or
> have to replace the motor...lol.
>
> Regards,
> Jason
> www.jasonshulman.com
> www.shulmanaviation.com
> www.composite-arf.com
>
> -----Original Message-----
> From: nsrca-discussion-bounces at lists.nsrca.org
> [mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Troy A.
> Newman
> Sent: Thursday, March 08, 2007 10:34 PM
> To: NSRCA Mailing List
> Subject: Re: [NSRCA-discussion] YS-160 setting
>
>
> Jas,
>
> lean the pump a little bit about 1/4 turn and see if the motor starts to
> go
> lean in the transition.
> The way this engine works is the pump pushes the same amount of fuel all
> the
> time. Every stroke it pushes the same volume of fuel. If the engine is at
> idle and not using the fuel then pressure builds up in the injector line
> until it gets to that magic pressure where the pump pressure screw allows
> it
> to bypass back to inlet of the pump. So everything the engine doesn't need
> gets pushed back around to the inlet of the pump for the next gulp.
>
> If you are at idle, and the pressure control on the pump is too tight
> meaning not allowing enough to loop back around it will got in and get
> burnt
> and come out as lots of smoke at idle. Yet when you are at full power or
> at
> least upper end power the HS needle is set and the mixture is correct.  So
> what is happening is you have too much going to the engine and not enough
> bypassing around.
>
> Lean the pump...CCW. If you get to lean on the pump is will start to
> detonate on throttle up or will sit and surge at idle. To be honest the
> pump
> setting are actually pretty broad and the engine will run correctly with
> many different setting. The key is the pump always moves the same amount
> of
> fuel. You are not adjusting pump pressure, you are adjusting the pop off
> pressure. Meaning the pressure which the little diaphragm will allow fuel
> to
> loop back to inlet. So adjusting the pump richer means more pressure on
> the
> spring and diaphragm so the pressure it takes to allow bypass is higher
> and
> as result more fuel goes to the engine. Less spring pressure on the
> diaphragm and the lower the pressure in the injector line needs to be to
> allow the bypass and the less fuel goes to the engine because the little
> pressure valves open sooner.
>
>
> If it always pumps the same volume of fuel, and more is going to the
> engine
> it will burn and turn to smoke especially at idle and below 1/3 throttle.
>
> Now that explanation was for everyone else. Here is the Jason answer.
>
> Turn the little brass screw on the front 1/4 CCW and see if it helps! if
> it
> surges at Idle you went too far.
>
> Troy
>
>
> ----- Original Message -----
> From: "JShulman" <jshulman at cfl.rr.com>
> To: "NSRCA" <nsrca-discussion at lists.nsrca.org>
> Sent: Thursday, March 08, 2007 5:06 PM
> Subject: [NSRCA-discussion] YS-160 setting
>
>
>> Hi all,
>>
>> I've got my friends DZ and the high end needle is 1 1/8 turns out. The
>> reg
>> is somewhere around flush. It smokes and bunch, smooth transition, but
>> 20ozs
>> in less than 8 minutes if I'm not careful. I remember hearing (being
>> told)
>> that there is a less consuming set-up that I haven't done yet. Anyone
>> know
>> what it is? Gonna fly again tomorrow and try it. Thanks.
>>
>> Regards,
>> Jason
>> www.jasonshulman.com
>> www.shulmanaviation.com
>> www.composite-arf.com
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>>
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>
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