Electric Flaps Fix for bow legged builder

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Re: Electric Flaps Fix for bow legged builder

Postby danerazz » Sat Oct 04, 2014 12:52 pm

I just meant a belcrank with the pivot in the middle so it would pull on both sides at the same time with a linear actuator to move it.
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Re: Electric Flaps Fix for bow legged builder

Postby kenryan » Sat Oct 04, 2014 1:05 pm

Ok, now I get it. That could be adjusted for speed and throw also, depending on how long it is and where the actuator connected. Good idea!
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Re: Electric Flaps Fix for bow legged builder

Postby kenryan » Sat Oct 04, 2014 3:57 pm

This youtube video shows how a servo motor might be used in conjunction with a double arm bell crank:

https://www.youtube.com/watch?v=sz21-SPqGcQ
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Re: Electric Flaps Fix for bow legged builder

Postby danerazz » Sat Oct 04, 2014 6:54 pm

That is more complicated and not quite exactly what I had in mind. I was thinking of an arm with a pivot point in the middle, with the two flap cables attached to the ends. The pivot point would be attached to a bearing and anchored to the airframe. The linear actuator would attach to one side of the arm so it could rotate it a number of degrees by pushing or pulling on that side of the arm. The cables both need to be pulled to lower the flaps, and that is what it would do. The video looks like a steering setup.
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Re: Electric Flaps Fix for bow legged builder

Postby kenryan » Sat Oct 04, 2014 7:10 pm

The video looks simpler to me in that the double arm bell crank arm could be fastened directly to the servo shaft, making the servo shaft the pivot point. Also, since there is no actuator extending, it could be more compact. The video shows radio control. I'm not sure how complicated the control would need to be if not radio controlled.
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Re: Electric Flaps Fix for bow legged builder

Postby danerazz » Sat Oct 04, 2014 9:11 pm

It would be more simple, but you would need a relatively powerful servo, so likely more cost and weight. If the servo/actuator was a true R/C signal type servo you can control it with a $15 micro controller and simple code and make it have preset positions, automatically retract the flaps as you speed up or extend as you slow or not extend over a certain speed or just run up and down with a switch. I designed and built an electric trim system that used one and it worked great, but I couldn't find a servo with a small enough dead zone to eliminate slop in the trim.
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