What size blades for .91 heli  
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All Forums >> RC Helicopters >> RC Helicopter General Discussions >> What size blades for .91 heli
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What size blades for .91 heli - 12/15/2001 7:42:11 PM   
woodscra


 

Posts: 895
Joined: 12/10/2001
From: frisco, TX, USA
Status: offline 		With a Fury having a OS .91, what length main's and tail blades are you guys using?

Thanks
Craig
       Post #: 1

The longest blades - 12/27/2001 12:43:33 PM   
dyoo


 

Posts: 7
Joined: 12/27/2001
From: Fort Lee, NJ, USA
Status: offline 		To keep giving load to your 91 size engine, I would put 700mm or 710mm. I'm using YS80 in Vigor CS with 700mm V-blades. The blades I'm using is about 190g. It is little heavier than others.
So far, it seems OK.
I'm building Fury kit and planning to put OS91 or YS80 with 700mm V-blades. I'll be looking for heavier V-blades. Just like what I did to my Vigor. The limit of tail blades in Fury is 100mm, if you are using 700mm. People say 700mm and 95mm is max.
This is just my opinion.

< Message edited by dyoo -- Dec 27 2001 7:47AM >

(in reply to woodscra)
       Post #: 2

91 Blades - 12/27/2001 8:58:56 PM   
GM1



Posts: 246
Joined: 12/6/2001
From: Tallahassee, FL, USA
Status: offline 		The blade size is determined by the gear ratio, selected head speed, and style of blade you opt to fly. On my Pro IIK with 7.75:1 gear ratio I can run the regular 690mm semis at 1850 on 20% nitro. On the Fury with 8.18:1 gears I run 710mm symmetricals at 1750 on 30% nitro. By the way Miniature is coming out with an extended tail boom (32 1/2" I believe) to run longer blades and up to 110mm tail blades.

_____________________________

In a dog sled team, if you're not the lead dog, the view never changes.

(in reply to woodscra)
       Post #: 3

gear ratio - 12/27/2001 9:44:44 PM   
dyoo


 

Posts: 7
Joined: 12/27/2001
From: Fort Lee, NJ, USA
Status: offline 		I fogot to mention gear ratio. My Vigor has 8.4:1.
If I use YS80 for Fury, I'll go for 8.45:1.

GM1, What engine are you using on your Pro IIK?
7.75:1 is good? I'm just wondering if that is fine or
too low.

(in reply to woodscra)
       Post #: 4

BIG motors - 12/27/2001 11:14:22 PM   
GM1



Posts: 246
Joined: 12/6/2001
From: Tallahassee, FL, USA
Status: offline 		I have one Pro IIK with an OS 91 with the 7.75:1 gear and another with YS 80 with the 8.18 gear ratio. The 7.75 may be just a fuzz too tall but I'm running the small 60 size muffler and waiting for the big 90 size muffler before I make a final decision. I have the gears to try 7.9:1 and 8.4:1 also.

_____________________________

In a dog sled team, if you're not the lead dog, the view never changes.

(in reply to woodscra)
       Post #: 5

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