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Old 02-19-2014, 05:38 PM   #1 (permalink)
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Default Blade length, Main gear and pinion

As I am going to be using my Trex 550E V2 in a scale body
I have a set of beautiful 560mm CF blades about an inch longer than stock and would like to use them.

Anyone know of a calculator available for calculating load and current requirements
gear and pinion selection for blade length?

I'm not going to be doing 3D with it so I figure running a little longer blade in the 2000 RPM range should give the helicopter plenty of lift? But I'd like to keep the motor wound up so it's not bogging or drawing excessive current

Any advice would be great.
Ron
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Ron
Petrolia Ontario Canada.
Electric, MCPX-BL,450X, Trex 550E Nitro Hirobo SCEADU Evolution 50

Last edited by Imzzaudae; 02-19-2014 at 07:31 PM..
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Old 02-19-2014, 09:03 PM   #2 (permalink)
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Hi. You are currently running the 16t pinion and 170t main gear as normally equipped on the V2's I presume. Also, you have the1220kv motor as supplied. The smallest practical pinion you should use is the 13t with the gearing and motor you have. Your alternative is to lower the kv of the motor to something around an 890kv rating and keep the pinion or drop it by one tooth to the 15t. For scale application of a 550 chassis, 2000 rpm is much too high and most will use anywhere from 1450 to 1600rpm at the most. Using 560mm blades will also put more load on the gearing and you might find that the tips of the blades could, in an extreme move or hard landing, make contact with the tail rotor blades. I run 550mm blades on a Jet Ranger and they have enough clearance from the tail rotor. In fact, I just measured the distance from the tail blades to the bolt hole and it is 550mm. In other words, even I need to mind my hard landings or the mains could clip the tail blades if they happen to exactly line up. Hope this helps.

Don
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