Maiden my YAK

[accaptain]

Well it has now flown. I took it to the field tonight and everything checked out so I put her in the air. First thought after take off was wow, It seemed to want to fall toward the nose and I had to input several clicks of up trim. Then it wanted to rotate left so several clicks of right aileron trim. Once it was trimmed in it was fine and I wondered if the cg was good. I flew around a couple passes around the field then rolled inverted. Very little down elevator was required in fact I could breath on the stick to keep it inverted. I brought around for approaches to test the landings and it is a real floater, settled in perfectly. I fueled let the engine cool and took it up again. A couple things happened on this flight that now have me concerned. I passed in front of me rolled to knife edge and took a (what I believe) was a radio hit. The engine burbled and the rudder flickered so I rolled straight and was going to land but decided to keep it up. I made a few more passes, did a touch and go and rolled knife edge (same direction) again. Once again it did the same thing (like it took a hit) and rudder flickered and throttle or engine changed. So I flew around normal did a couple rolls (ailerons are effective, even on low rates) and landed it. Now I want to fly again but what caused this? It happened in the same spot over my airfield each time. Was this random interferrence or something in the plane? I am running 649spcm JR and this is the first time ever that I have received anything like this with this receiver. A guy at my field handed me a large ferrite ring that snaps together. Should I put this over all the wires right before they enter the receiver? Should I fly it again and see? A little scared now but it only seemed to happen in knife edge or when I sustained rudder for a second. I did four point hesitation rolls inputing rudder and it didn't do this. By the way the plane is awesome, snaps are amazing and quick! I didn't do any hard snaps just yet. Please help me figure this out.

Accaptain

[snaprollsoda]

Do you have pull pull on your rudder? if the cables arnt coated then you can get RF when you input rudder from them sliding. You said it only happened when you roll to knife edge. Start the motor on the ground and take a walk, move the rudder quickly like you were doing knife edge see if it changes. hope this helps

[Reza]

I'm glad you like the plane. Engine burbling in knife edge is normal. It's because of pressure changing in the cowl. It can happen in knife edge or inverted flight. If it's too much you need to get the carb plate from DA but I suspect it's because your low end is rich, given it's a brand new engine.

As far as rudder goes, first of all make sure that your rudder cable is tight at any angle of rotation on both sides, meaning if you give it full left rudder, tension on both left and Right cable is tight like when the rudder is in center.

Did you range check the way I explain in the new manual? Did you try half or full throttle range test or not. I strongly suggest you do the range test the way I am referencing to in the new manual. If you are loosing about 20% of your range with engine running at half to full throttle, investigate. I am also assuming your smoke pump system was completely off, right?

Let me know, how it goes.

Reza

[Reza]

I forgot to mention one more thing, if it's a PCM receiver your hit should appear as lock outs! And as far as flying it goes, I wouldn't until I find out what the problem is or at least do not try to fly it low , you've got a have enough time to recover from the hit if that's the case. I really think there is a problem with your rudder movements through out its range, can be too much expo or tension or servo problems. I had one of my 8611a going bad and basically putting too much load on the other servo and it was brand new. If you grab your rudder and move the rudder, would your servos move freely in the whole range? or you get sticky feelings?

[accaptain]

Yes the rudder cables are pull pull and there is a thin plastic coating over them.

Reza, Yes the smoke system did not have power (takes that out of the loop).

I probably didn't exaclty do the range test as per the manual but the way I have alway's done them. Test with the antenna down and I walked away from the plane in a horizontal line. I got to probably just shy of 100 feet and the plane did not respond anymore with control input. So bascially I could control it with antenna down up to the 100 feet or so then I had to pull the antenna up beyond that range. No twitching and everything was stable. I even deflected all surfaces several times. I then started the engine and walked the same way antenna down walking horizontal to the plane and got about the same distance and the motor went dead (fail safe). I then went back started it back up but I don't think I checked it again with it running trying to give it throttle. I didn't want to rip the guys legs off that was holding it for me. DA POWER. Last night I dropped one rudder cable below the horn to seperate the pull pull wires from touching. I am going to range test it per your instructions and try it again. I routed the wires to what I thought was pretty good. I do have the throttle servo wire running with the receiver battery down one side of the plane to the receiver but I don't think that has anything to do with it. All my ignition stuff is way up front (on engine box) and the switch for ignition is right behind cowl.

What do you think about the cg per my description? Having to give more trim like I did, does the cg affect the trimming of the plane as well? I would assume so but wanted to ask. Reason being is once it was trimmed, inverted flight was pretty much just a touch of down elevator. I just read about most people only having to give a click of one direction or the other and I have probably three or four clicks up elevator and three to four clicks right aileron. I know every plane is different, just curious.

Hey thanks for your help everybody! I am just a nervous flyer right now the $$$$ signs are going nuts in my brain.

[accaptain]

	Quote: Originally Posted by Reza
	I forgot to mention one more thing, if it's a PCM receiver your hit should appear as lock outs! And as far as flying it goes, I wouldn't until I find out what the problem is or at least do not try to fly it low , you've got a have enough time to recover from the hit if that's the case. I really think there is a problem with your rudder movements through out its range, can be too much expo or tension or servo problems. I had one of my 8611a going bad and basically putting too much load on the other servo and it was brand new. If you grab your rudder and move the rudder, would your servos move freely in the whole range? or you get sticky feelings?

Both times I was kind of low I know I know. Definatley won't do that anymore till I have this resolved. I know what you mean about the PCM lockout and not getting hit as with fm. Each time it was for a blink that the throttle would try to go to idle (failsafe) and the rudder would flicker as if it were going back netural (failsafe) position. As far as the rudder servos go, they move very freely through out there movement or range. At netural and both end points they are matched, in fact I have no servo noise at netural and very little when deflected. (Which I believe means they are not fighting each other. I did go back a few days after setting up the pull pull and tighten the cables because they seemed to loose to me. This was before the maiden.

[Reza]

Anthony,

What radio 10X or 9303? 100ft is not acceptable in my book, it's not as much as I would like to see a healthy system. My plane with my 10X passes range test with engine at full blast over 250ft. Please go over your set up and do the range test per instruction. If you have the 10X, take the antenna off but if other radio just have it collapsed.

CG does chagne your trim setting but for now fly it as it is set up right now. All of our Yaks take uptrim to fly level but only 2-4 clicks that's because of 0 incidence. Did you look at the Ailerons after they were trimmed out, does look like that one size favors the other side a lot? I feel you need more time on this plane for actual trimming. Sometimes you compensate rudder trim with Ailerons. Don't worry about the trim, 3-4 clicks is not of a concern on any plane.Investigate the problem before you fly it. Range test without engine running and let me know what radio you have. Like I said if you are using 10X, 100ft is not what I'd like to see.

Reza

[Reza]

BTW, your aileron trim can be due to latteral balance being a little off as well but don't you worry about all that, you will fine tune the plane once you've flown it 20-30 times.

[Reza]

Guys,

To all of you that would like to know how a good range test is done, please read this article in its entirety. Since I have been following this method I have never had any problems. I strongly recommend you to give it try http://www.jrradios.com/Articles/Art...ID=1079&Page=1

Thank you,
Reza Gholamipour
Quique's Aircraft Support

[accaptain]

	Quote: Originally Posted by Reza
	Anthony, What radio 10X or 9303? 100ft is not acceptable in my book, it's not as much as I would like to see a healthy system. My plane with my 10X passes range test with engine at full blast over 250ft. Please go over your set up and do the range test per instruction. If you have the 10X, take the antenna off but if other radio just have it collapsed. CG does chagne your trim setting but for now fly it as it is set up right now. All of our Yaks take uptrim to fly level but only 2-4 clicks that's because of 0 incidence. Did you look at the Ailerons after they were trimmed out, does look like that one size favors the other side a lot? I feel you need more time on this plane for actual trimming. Sometimes you compensate rudder trim with Ailerons. Don't worry about the trim, 3-4 clicks is not of a concern on any plane.Investigate the problem before you fly it. Range test without engine running and let me know what radio you have. Like I said if you are using 10X, 100ft is not what I'd like to see. Reza

Reza, I have a 9303. I didn't exactly measure how far I was but the 100 feet was an estimate of how far away I was. I will count my steps this weekend. I won't worry about the trim settings, I'll just burn some gas for now. It flys fine after it was trimmed in. I diidn't really notice the ailerons after they were trimmed. I will look at that as well. I will range test it again and let you know what I find.

[Shakes]

Anthony, awesome that you maidened it. I have one of the ferrite chokes on mine - but only on the throttle servo extension. I was never really comfortable having the throttle servo so close to the engine. It might be worth a try but I'd hold off until you redo the range check and see what kind of range you're really getting.

I also agree with Reza on trim changes. Mine needed 2 clicks of down. I'm a little tail heavy but it flies fine. My 85" needed 2 down and 2 right aileron. As long as you get it to fly straight and level - don't worry too much about it. Just fine tune as you get more flights in

Great job though and I am positive you'll get the range issues worked out. I'm glad you like how it flies. Does it fly anything like I described to you when you were asking how Yaks flew?

[accaptain]

It is tough for me to describe how it flys since I have only had the two flights so far but I will say I am impressed! I think I am more impressed with the way it lands. Really floats down to the runway. My WH took a lot of power on final to keep it flying, not this Yak. Rolls seem very axial and the plane just goes exaclty where you point it.