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Bird Of Time Conversion - CG Question

Old 10-21-2015, 05:57 AM
  #26  
Larry3215
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Originally Posted by fhhuber View Post
For maximizing performance you want to minimize drag.

The bend made by having the elevator not in line with the horizontal stab is a drag inducer. It may not be much... but its there.

Realigning the horizontal stab, elevator and CG on my Dynam Me-262 was worth 5 mph higher top speed. Not bad for a model that does 110 set up by the instructions.
I agree - for hi speed models it can potentially be a significant issue. For most sailplanes and sport fliers its a non-issue unless the misalignment is severe.
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Old 11-08-2015, 03:06 PM
  #27  
FlyWheel
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Originally Posted by Larry3215 View Post
I agree - for hi speed models it can potentially be a significant issue. For most sailplanes and sport fliers its a non-issue unless the misalignment is severe.
He's got a point (this much I do understand) Remember, air resistance increases at the square of the increase in velocity: 2x speed = 4x drag, 3x speed = 9x drag and so on*. Many sailplanes tend to float at a fraction of the stall speed of some faster planes.


*(as a bicyclist I am all too aware of this! )
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Old 11-08-2015, 08:23 PM
  #28  
paxskipper
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thanks to all that have contributed to this discussion.

I have about a dozen flights on the BOT and think I have the CG close. I'll take a few more flights and shift the battery back a little more.
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