Gliders > Slope Soaring

Mini Quark build

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johnfireball:
Hi all,
      The bellcrank on the Quark amplifies the movement  of the elevator by a factor of about 2. I had to set the servo endpoints at 50% each side to achieve max elevator deflection, so the servo was moving very little each way making any positioning errors critical. Since fixing I have moved the pushrod end into the centre hole of the servo arm whereas it was in the outer hole and used the lower hole in the bellcrank. This I hope will sort the problem.
The snake did work but there was bounce in the elevator (the snakes were moving in the fuse) and with the added airflow over the elevator under power, I wasn't happy with it. The snake will work but I go along with Bill on this.
Model is repaired and now has up ailerons mixed with throttle stick to eliminate the flap effect of the undercambered wing section. Yet to test.

Fred:
Hey John,

Sorry to hear that, and glad it is already fixed!  :clap:  :clap:

johnfireball:
A short video of the crash. You can see the pitching problems.
John

[youtube]https://www.youtube.com/v/4-slzgYwv8c[/youtube]

johnfireball:
Hi all,
       Model is now sorted and is a joy to fly. The elevator is so much better be the model gliding or under power. The aileron up mix with the throttle has cured the pitch up problem. This ones a keeper. Looking forward to flying it some more.
John.

Happy Days:

--- Quote from: "johnfireball" --- The aileron up mix with the throttle has cured the pitch up problem.
--- End quote ---


This seems strange John, I’ve never heard of it before. :?:  So you’re saying that you have installed a mix so that as the throttle is increased both ailerons deflect upwards slightly do they? And this stops the model from pitching upwards?

L.K.

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