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Old 12-22-2005, 07:03 PM   #1
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Choosing a servo size

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I'm in the process of building a 1/6 scale Bellanca Aircruiser... But I need to get servos for it now,and am puzzled as to what size to get... I would prefer Hi-Tec ones (have had flawless service from them),but need to know wich to choose... OK the elev is 38"X 4" so 152 sq inches, rudder is 16"X 4" (roughly) so 64 sq ", and the ailerons (each is ) 34"X 3" so 102 sq"....
I'm just flying this in a nice "scale manner" so not doing 3D with it... I thought I might go with HS-475BB's (76oz at 6V) for the rud and ailerons and a HS-645MG (133 oz at 6V) for the elev... I would be using a 6V pack and a standard servo for the throttle and a Supreme 8ch receiver...
Darren loves Floatplanes and dirt bikes
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Old 12-22-2005, 08:44 PM   #2
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There's a useful servo torque calculator at:

"Simplicate and add lightness"
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Old 12-23-2005, 06:08 AM   #3
Gaetan Cormier
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I'm flying a Dynaflite chipmund with a Poulan 42, an Edge 540 with a Sach 50 and an Edge 540- 89" wing span with a Huskvarna 72cc. I've been flying some of these for 3 years with no problem.

I'm not a 3D expert but I try to hover at every flight and I realise that I would need more torque on the elevator and rudder to do so but to fly scale or normally, you don't need extra power.

I fly with futaba 3004 or standard servos except for the rudder where I put a 76oz 4.8v. All others are standard servos, one on each aileron and one on each elevator.

I think guys are exagerating the need of power except if someone want to fly 3D with a big airplanes.

I know that probably many guys won't agree but it's what I've experienced.
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