RE: Focus Sport 110 YS Powered  
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All Forums >> RC Airplanes >> Pattern Flying >> RE: Focus Sport 110 YS Powered
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RE: Focus Sport 110 YS Powered - 6/2/2008 1:42:07 AM   
Troy Newman


 

Posts: 2429
Joined: 12/30/2001
From: Goodyear, AZ, USA
Status: offline 		Shim the motor mount for a 1/2" difference between the left and right prop tips. THIS NUMBER IS ONLY GOOD IF THE PROP USED FOR THE MEASURMENT IS 12" DIAMETER.

So bolt a 12" prop on it....and take the measurements. Or do the trigonometry on the 15" prop...either way...setup about 2.33degs of right thrust.

Then Install a Nose ring. Without the nose ring there is nothing you can do to set tot he thrustline properly. The thrust will be constantly changing...the model under G loads of pulling corners and throttle up and down changes the thrust line will change...and it will change a bunch.

Flat turning means the model is Yawing in flight. Fly directly away from you and into the wind or directly downwind. Is the model flying straight or is curving left or right. If the model is yawing in a horizontal line then its flat turning...the wings are level but the model is turning....

This is how I set my rudder trim...you need to do this as various throttle settings...they will have an affect.

If you don't have a nose ring in the model you are wasting your time. You can't tell where to set it becasue its moving all the time.

If you don't have close to the offset I talk about you are again wasting your time. If we already know that about 2.33degs is about right....then it does ZERO good to try it at 1 deg of offset.


Get the changes made and we'll walk you through it...its a really good model. I have my model here for a reference.



Troy

(in reply to JPal101)
       Post #: 251

RE: Focus Sport 110 YS Powered - 6/4/2008 4:28:32 AM   
JPal101


 

Posts: 374
Joined: 8/30/2004
From: Staten Island, NY, USA
Status: offline 		Troy

I installed the nose ring and offset is done

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JPal101

(in reply to Troy Newman)
       Post #: 252

RE: Focus Sport 110 YS Powered - 6/4/2008 4:54:36 AM   
Troy Newman


 

Posts: 2429
Joined: 12/30/2001
From: Goodyear, AZ, USA
Status: offline 		Now when you fly the model....

Fly it directly away from you into any wind. Or directly downwind. Do this many times at 1/2 throttle, So you are flying without crosswind and looking at the model straight on. Set you rudder trim. It may take several passed. Also you will likely have to play with aileron trim trim too.

But make the model fly straight no flat turning...and the ailerons are dead on hands off as well.

Once you have this set...vary the throttle like 3/4 power, or even full power and the same test.

Then fly directly away from you go to a given power setting that will maintain a straight no flat turn situation in level flight and pull to vertical, leaving the throttle where it is even if its 1/2. After the corner straighten the model if it needs it then let go and watch the model. Since its going directly away from you don't be out 1000yds but don't be right over you head either. Do the test many times and make sure you are pulling straight into the vertical....let go and watch the model. This will tend to show you if you need more thrust offset left and right or not.

This same test happens at higher throttle settings...But for now don't vary the throttle in the vertical...set it where you need it and then pull the corner leaving it alone for the up line.


Once you have your thrust line tweaked goo like this then we can talk about variable throttle changes on the upline....This is where we will use a mix if its needed....If the model pulls the corners and goes straight without the throttle moving its set for thrust line. However it is possible that throttle position changes down then up then down on the up line will cause the model veer a little this is usually minor. See what you got and we'll talk more.


Do the tests many many times to determine if the model is doing the same thing. If its very slight to the left or right...try a click or two of rudder trim and then re-do the straight flight away and toward you to see how it affects the horizontal lines and the flat turning. You will get a rudder trim that is about right but it still may wander just a little on a upline...or its goo all the way until full power and at 3/4 to full at the very tops it will wonder just a smidgen. When you get it like that come back and let me know....and we'll discuss the next step.

This is the proper place to apply the throttle to rudder mix. But there are some pitfalls and you want to avoid them. By the way my Focus Sport doesn't have the throttle to rudder mix I just checked the radio.


Troy Newman

(in reply to JPal101)
       Post #: 253

RE: Focus Sport 110 YS Powered - 6/4/2008 11:09:15 AM   
JPal101


 

Posts: 374
Joined: 8/30/2004
From: Staten Island, NY, USA
Status: offline 		Troy,

Great, I will fly it in the next couple of days and let you know.

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JPal101

(in reply to Troy Newman)
       Post #: 254

RE: Focus Sport 110 YS Powered - 6/10/2008 7:45:31 PM   
atul123


 

Posts: 61
Joined: 2/14/2008
From: Los Gatos, CA, USA
Status: offline
Troy:

I've got a YS-110, but I wanted to ask: will a JETT 90L (which uses a 12x6 or 12x7 prop - nothing bigger) be appropriate for the Focus Sport? From the pictures, it seems that the model does not particularly require a very large prop. The JETT turns at 15,000 RPM and has great throttle response. In theory, that should be OK for the Focus Sport.

Please advise. Is this model totally unsuited to engines like the JETT? Is it made specifically for 4-strokes like the YS-110?

Thanks,

Atul Saini

(in reply to Troy Newman)
       Post #: 255

RE: Focus Sport 110 YS Powered - 6/11/2008 12:15:04 AM   
Troy Newman


 

Posts: 2429
Joined: 12/30/2001
From: Goodyear, AZ, USA
Status: offline 		I have no idea sorry. I don't like 2 strokes for pattern type flying. They are fine if you intend to fly at full power all the time but they just suffer in the torque curves at middle throttle positions. If you want to fly pattern with a Focus Sport I think you should use a YS 110 it is an excellent combination.


Troy

(in reply to atul123)
       Post #: 256

RE: Focus Sport 110 YS Powered - 6/11/2008 2:32:13 AM   
wackedrc


 

Posts: 5
Joined: 9/11/2007
From: Donald, OR, USA
Status: offline 		Since we are for the moment on the motor subject.... What rpm range is best for the YS 110 ? I have been running a 15-10 with 20% fuel. Runs about 8600 static at full throttle. This seems reasonable but my experience is mostly with OS four strokes.
Would the YS be happier with a 14-10 at a higher rpm ? It will pull the plane vertical as long as I hold it with the prop i am using now,so all seems fine but will the motor maby be happier if i run it a little faster?

Thanks again Troy for all of your help with this plane on this forum!
....Dan

(in reply to Troy Newman)
       Post #: 257

RE: Focus Sport 110 YS Powered - 6/11/2008 3:03:58 AM   
pappy35


 

Posts: 364
Joined: 10/30/2006
From: Liberty Township, OH, USA
Status: offline 		Great timing on that question. I'm on the learning curve with my YS110 and am currently running an APC 14-10 on CP 30% Heli Mix. I think the 14-10 is a little light for this motor. I can peak it to just over 10k (I back it off to 9.7k).

The only other prop I could find locally was an APC 15-12 which I'm hoping won't be on the other end on the spectrum. Look forward to Troy's response.



Al


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Al

(in reply to wackedrc)
       Post #: 258

RE: Focus Sport 110 YS Powered - 6/11/2008 3:05:47 AM   
pappy35


 

Posts: 364
Joined: 10/30/2006
From: Liberty Township, OH, USA
Status: offline 		<snip>

Duplicate post.


Al

< Message edited by pappy35 -- 6/11/2008 3:53:05 AM >


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Al

(in reply to wackedrc)
       Post #: 259

RE: Focus Sport 110 YS Powered - 6/11/2008 3:48:17 AM   
Troy Newman


 

Posts: 2429
Joined: 12/30/2001
From: Goodyear, AZ, USA
Status: offline 		On the 30% heli mix the 15-10 is perfect for my conditions...but I'm hot desert at about 1200ft. It will get better at lower elevations and still be great.

The 14-10 is a little light loaded for the 30% nitro but that is fine...you are not going to hurt the motor running it in the high 9's. It will probably work better for you on a 15-10 at about 9300 with the 30% heli performance blend.

On only 20% nitro I suspect the 15-10 is a little heavy on load. Try a 15-8 APC. or the 14-10 due to the lower nitro. And yes it will be a little happier up over 9k

The best target rpm for the YS 110's is about 9000-9600 find a prop and a fuel that turns this for your conditions and the engine will be happy and making its best power.

If you are high elevation like Denver at 5000 or 6000ft try the 15-8 on the 30% nitro and you should be in the range.



Troy Newman
Team YS

(in reply to pappy35)
       Post #: 260

RE: Focus Sport 110 YS Powered - 6/11/2008 3:58:55 AM   
pappy35


 

Posts: 364
Joined: 10/30/2006
From: Liberty Township, OH, USA
Status: offline 		Troy a couple of questions to help me up the steeper part of the YS learning curve:

1) Is is normal for air bubbles to form in the fuel line between the regulator and the carb?

2) Fuel streams out of the air chamber air intake o-ring if it quits with fuel still in the line. Is this normal?

3) Surging is defined as a small (say 100-300 rpm) variation in rpm. This condition at the 4krpm set-point means it's _ _ _ _ (rich/lean)?

Thanks for your time and you many contributions to this board!


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Al

(in reply to Troy Newman)
       Post #: 261

RE: Focus Sport 110 YS Powered - 6/11/2008 4:02:00 AM   
Troy Newman


 

Posts: 2429
Joined: 12/30/2001
From: Goodyear, AZ, USA
Status: offline 		your air bubbles are form the leak at the air box. Its not normal and surging at the 4000rpm number is a sign of lean. You are lean from the air leak.

Contact Richard Verano regarding this problem. He will take care of your problems for you.

Troy Newman

(in reply to pappy35)
       Post #: 262

RE: Focus Sport 110 YS Powered - 6/11/2008 6:55:13 AM   
atul123


 

Posts: 61
Joined: 2/14/2008
From: Los Gatos, CA, USA
Status: offline
> I have no idea sorry. I don't like 2 strokes for pattern type flying. They are fine if you intend to fly at full power all the time but they just suffer in the torque curves at
> middle throttle positions. If you want to fly pattern with a Focus Sport I think you should use a YS 110 it is an excellent combination.
>
> Troy

Thanks Troy. I see your point about the torque curves.

I'll go ahead and use my YS-110 then. The prop discussion on the thread has been useful.

atul

(in reply to Troy Newman)
       Post #: 263

RE: Focus Sport 110 YS Powered - 6/12/2008 12:48:47 AM   
wackedrc


 

Posts: 5
Joined: 9/11/2007
From: Donald, OR, USA
Status: offline 		Thanks for the prop info Troy. I will try the 15-8 and see how that works. By the way I am in Oregon flying at about 150 feet above sea level. Right now temps ar in the 70's ,maby the heaver pitch prop will be the ticket when the air gets hotter and thinner. I had a feeling that the