[NSRCA-discussion] YS-160 setting

Thu Mar 8 21:10:43 AKST 2007

18.1-10 is good on the 160's I don't like the W version in Arizona on the 
160.

Now the wide version is the SNIZZLE on the 170 in AZ with the Adventure or 
the Astral XXc,

try the W in that thick FL air. I bet it will be better than the regular 
version.

I turn will turn the 18.1-10 about 8400 on the 160 and this is loud, will 
not make noise. But We have been playing with the props and some 
re-discovered, old techniques and I can get to run really quiet at about 
8100 and it makes noise easily and has way more punch than anything else I 
have seen or flown.

The issue now is not power. The issue is grunt and pulling the model through 
tough things like the "S" without needing high speed and yet digs the model 
out of the hole on upline snaps and through windy conditions on the backs of 
turnarounds downwind and so on. The time where you need the energy, yet the 
model is not going to be acerbating up to Mach 2.

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 9:14 PM
Subject: Re: [NSRCA-discussion] YS-160 setting

> 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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