Knife edge pulling to belly

[Hogger]

And it pulls hard. I'm still going back through all my balancing after a pretty serious crash, but it fly's fine, and was able to take out the right thrust on the motor.
So doing a knife edge, it pulls real hard to the belly. I was wondering(before I stick more velcro on the plane) if moving the battery above the wing on the fuse might help? Or am I getting my physics confused?

[paulg]

Your nose heavy.

[msprygada]

And it pulls hard. I'm still going back through all my balancing after a pretty serious crash, but it fly's fine, and was able to take out the right thrust on the motor.
So doing a knife edge, it pulls real hard to the belly. I was wondering(before I stick more velcro on the plane) if moving the battery above the wing on the fuse might help? Or am I getting my physics confused?Make sure your surfaces are in line with the centerline of the wing and the horizontal stab. Then when flying, invert and see what happens. If the plane dives to the ground (I am guessing that is what is going to happen in your case...nose heavy like Paul says) then move the battery back until it needs little or no stick to keep it flying level. Then you will see the coupling disappear.

I thought I had my ailerons centered with the wing but they were off making it fly level right side up and up side down impossible. So I created a template out of cardboard that only touches the Le and TE of the wing and then sticks back over the ailerons. Then I would put it on the top and measure the gap to the trailing edge of the aileron. Then I would put it on the bottom and measure the gap and make them the same by adjusting the length of the control rods while keeping the servo arm perpendicular to the control rod. now the wing will produce the same lift whether you are right side up or up side down. The elevator is easy as it is flat. Then you can adjust the battery to get it to fly level.

Hope this helps.

[Captain Carlton]

msprygada,

Those are good tips!!!

[msprygada]

msprygada,

Those are good tips!!!Thanks. Took me a while to get the steps down but now I have my Yak and my Bipe flying great. The jig I made makes it a few minute process to get the ailerons perfectly centered. I thought I had them centered until I used this jig. Then I made sure all my servo arms were perpendicular to the push rods and that made all the difference in the world in how it flew. Much more balanced response from the control surfaces.

I am really getting into the Yak and improving every flight out. I just cannot get enough of flying this plane. The power to weight ratio is incredible and it flies really great! :D I will buy a new kit this winter and move all the equipment over to the new plane. I have learned a lot about flying and especially 3D from the Yak and it is starting to show. ;) So I will build a new one in the next month or two and get ready to start beating on that one next spring.

The only thing I hate is in Michigan, flying is slowly coming to a close for the next 5 months. :(

[Captain Carlton]

Can you post a photo of the Jig?

[msprygada]

Can you post a photo of the Jig?

Here you go CC. I posted in this another thread about a week ago.

http://www.airfoilz.com/forum/showpost.php?p=2496&postcount=14

I put this jig on the top and bottom of the wing and make the gap equal between the jig and the rear of the aileron. Then the aileron is perfectly centered.