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HomeAircraftHelicopterHelicopter Main Discussion › 713 Main Blades on a 91SZ?
11-10-2013 04:54 PM  5 years agoPost 1


Chicago, ILL

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I had dead stick auto on my Hirobo Freya SSt and damaged the main blades and tail blades.
I was using 700mm Main Blades and stock nlue tail blades I beleive they were 105mm. The
My question is can I use 713mm Main Blades on my heli.? The motor is an OS91 SZ one with blue head non-pumped with CY 90 size pipe. I'm using 30% nitro fuel.
What size tail blades should I get with these 713 blades?

Any help will be highly appreciated.



11-10-2013 05:45 PM  5 years agoPost 2

rrKey Veteran

Campbell, Texas

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Best to use 680's or 690's for any kind of hard 3d.
Freya head is wider than most others. The disk span equals a Raptor running 710's when using 680's on the Freya.
You don't want to downsize the tail blades.


I love the smell of nitro in the morning.
RIP Roman

11-11-2013 03:27 AM  5 years agoPost 3


Richmond, VA, USA

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That first generation Freya head should use no more than 700mm blades. You can get away with 100mm tails because the tail head diameter is pretty wide as well. 713's plus 100+ mm tails will run with interference and risks a strike with any kind of zealous flying.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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