[NSRCA-discussion] Gas pattern options

[Mark Hunt]

I will chime in...George let me fly his Black Magic with the gas OS160 and I 
was pleasantly surprised.
Smooth, easy to manage power (like an OS140).  Very good power with an 
18.1x10 (I believe) despite the large airframe.  I did have to bring on the 
throttle sooner, just like any 2 stroke compared to a YS (or electric).  I 
did an upline snap with good success, which again surprised me.  George's 
setup got the plane very deep into the snap in the upline, but it pulled out 
of it and kept going.  The very low idle was very noticable in flight as 
well.  The motor spools down very quickly from high to low throttle (leaner 
mixture I guess because of the ignition) making downlines much easier to 
manage than a glow 2 stroke.

I think the OS gas setup or this new Syssa is begging for a custom designed 
light wood airframe or something like the bravo or abbra....  In the right 
hands this setup could be found mixing it up in masters...no problem.


-Mark


----- Original Message ----- 
From: <glmiller3 at suddenlink.net>
To: "General pattern discussion" <nsrca-discussion at lists.nsrca.org>
Sent: Sunday, December 13, 2009 09:47
Subject: Re: [NSRCA-discussion] Gas pattern options


> Carl,
>
> I'm experimenting with a gas conversion OS160 using an Aeroslave pipe. 
> Lance says the pipe isn't "built for gas temperatures" but so far I've had 
> more trouble with headers and couplers...pipe seems to be holding up fine.
>
> I hope I'm through the learning curve with this system and can fly it next 
> season competitively.  It doesn't have the "stupid power" that a YS 170 
> does, but Mark Hunt has flown the P9 sequence with it and it I think his 
> assessment was that the power was adequate.   Perhaps he'll chime in here. 
> The power is certainly plenty for the Advanced sequence that I'm flying.
>
> George
>
> ---- CHV69 at aol.com wrote:
>
> =============
> How about sound? Are we able to use the existing carbon fiber pipes
> available now like the Aeroslave and ES pipes with the gasoline engines? 
> Or are
> specially made pipes required?
>
> Carl
>
>
> In a message dated 12/13/2009 9:31:36 A.M. Eastern Standard Time,
> vicenterc at comcast.net writes:
>
> Correct.  However, fuel cost would make a difference if we could  use
> gasoline.  After my experience, I don't think gasoline engines  available 
> in that
> time were viable option for pattern for higher  classes.  However, it 
> could
> work for lower classes.  I am not sure  what gasoline engines 
> manufacturers
> are offering to increase power  today.  Gasoline engines for sure are more
> reliable in the low run than  glow engines.  Another issue, vibration of
> gasoline  engines requires special attention but is similar to the 
> situation we
> have when using glow engines.
>
>
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