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Old 03-12-2012, 04:37 AM   #21
mahbouni
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Originally Posted by Mentalic View Post
They are shaped simular to some of the rotortec blades. And as it happens I did weigh them and all the 690mm blades I have. The Edge are the original FBL version. Airfoils are quite different on these blades.

Edge 191g, CG 370mm out from bolt, 60mm wide, 8mm thick
SAB 179g, CG 355mm out from bolt, 60mm wide, 8mm thick
Rail 186g, CG 365mm out from bolt, 63mm wide, 8mm thick
Thanks for the info. Seems like there is a direct correlation between blade weight and ability to auto. Esprit Model has some specs on the Rotortech 690 3D. Only 168g. I bet they will be the fastest blades but auto really badly.

http://www.espritmodel.com/rotortech...in-blades.aspx
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Old 03-12-2012, 06:10 PM   #22
Mentalic
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Originally Posted by mahbouni View Post
Thanks for the info. Seems like there is a direct correlation between blade weight and ability to auto. Esprit Model has some specs on the Rotortech 690 3D. Only 168g. I bet they will be the fastest blades but auto really badly.

http://www.espritmodel.com/rotortech...in-blades.aspx
Airfoil makes a large difference as well but spinning mass is rather strait forward. Wonder where the span wise CG is on those Rotortech's?
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