flying the radian glider - Page 8 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 11-03-2010, 09:27 AM   #71
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Re: flying the radian glider

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I've been getting more into thermalling. I use my 1800s, sit back in the lawn chair and enjoy. Had some problems with the plane porpoising when the motor's off and I haven't yet quite figured that out.
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Old 11-03-2010, 10:21 AM   #72
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Re: flying the radian glider

Mark, CG correction needed. Take it up high, put it in flat glide and feed enough down trim to stop the porpoising, get it to fly level with no input. Then put in a 45deg dive and let go of the controls, if it dives under, increases the dive angle, then it is tail heavy, if it tries to pull out from the dive by itself, then it is nose heavy. Move your battery and try again, it should continue to dive in straight line if cg is correct. Stop the test if ground gets within 20ft
Do this when the wind is pretty light, most thermal guys also set the CG a little bit back so the plane is more sensitive to the thermals, conversely in windy conditions you can move it a bit forward to penetrate a little better.
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Old 11-03-2010, 02:38 PM   #73
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Re: flying the radian glider

Mark, your 1800's might be the culprit, as the Radian is balanced a little forward CG anyway (for beginner's saftey). Try the stock battery and see if the problem goes away, also dont be afraid to use down elevator on occasion to keep it smooth ...Radian has a big rudder and turns sharp (great for the "funnel" of a new thermal, but you need smooth, wider turns as you get higher; and that means no porpoising ....turning smooth with the Radian does require some "work" and technique).

Others on R/C Groups have suggested taping a penny to the tail to instantly move the CG back for a very low cost

That is the beauty of the Radian, despite it being a relaxing sport plane, it also trains some advance thermal skills and teaches you to read the sky. I wish I had the same skill with my teenagers, as they are much more difficult to read when they are out of balance.
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