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Flap servo options.

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Old 01-21-2013, 08:37 PM
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Robrow
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Default Flap servo options.

I am looking for flap servo options and wondering what standard size ultra high torque options there are other than say JR 8711 or Savox SC1256TG? Also digital or anologue?

Rob.
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Old 01-21-2013, 11:52 PM
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Dave Wilshere
 
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Default RE: Flap servo options.

Rob

Std size servos in my mind are 19mm width servos like the 8411. the 8711 is wider at 20.5mm but at the new special price the 8711 wins every time. Always always Digital, they were designed with flaps in mind...

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Old 01-22-2013, 01:09 AM
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Default RE: Flap servo options.

Rob

I know they are not popular as some seem to have issues with them, I have used the 5955TG's in petrol 3D airframes for years without issue so the 7955's should be better, spec below:

Hitec's best servo just got better. Based on the powerhouse HS-5955TG servo the HS-7955TG has the added benefit of Hitec's G2 second generation programmable digital circuit. This new circuit has twice the resolution of our original circuit while adding programmable overload protection.

The HS-7955TG has been designed for the most demanding hobby applications including the largest aircraft and monster trucks. Featuring a titanic 333oz./in. of torque at 6.0 volts, all this power is harnessed by incorporating the industries first Titanium gears for incredible wear resistance and two strong hardened steel gear pins and axial brass bushing in the servo case.

Hitec HS-7955TG Features

G2 Digital Circuit
Coreless Motor
Dual Ball Bearing Supported Output Shaft
Titanium Gear Train (MK first gear)
Programmable Features

Dead Band Width
Direction of Rotation
Speed of Rotation (slower)
End Points
Neutral Points
Fail Safe On/Off
Fail Safe Point
Resolution* (default is high resolution)
Overload Protection* (default is off)

*these features are only programmable with the HFP-20 field programmer

Mike
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Old 01-22-2013, 03:30 AM
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Default RE: Flap servo options.

A Hitec 5645 is a standard size hi torque metal geared digital servo and more that adequate for flaps on most jets, if for some reason you need more power use the 5755
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Old 01-22-2013, 04:46 AM
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Default RE: Flap servo options.

I need them for the flaps on my big Tutor, the manual recommends 8711's, just wondering if there were any others in the same league that people trust with their multi $$$$ jet? I'll have a look at the Hitec's.

How much is the new special price Dave?
Rob.
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Old 01-22-2013, 05:07 AM
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Default RE: Flap servo options.

Rob,

Go with the JR, i know that others would argue to the contrary but i would not trust Hitec in my jets and at £80 for the 8711 it does not make sense to go for Hitec. Buy with confidence, fit and forget!

Looking at what the 7955 is going for which is about 60 ish quid, the saving is not really worth it when you compare it to what you would have spent on the airframe and turbine.
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Old 01-22-2013, 05:47 AM
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Default RE: Flap servo options.


Quote:
ORIGINAL: Jamie C

Rob,

Go with the JR, i know that others would argue to the contrary but i would not trust Hitec
+1 I would not let hitec in any of my models never mind the jets, had endless trouble with them
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Old 01-22-2013, 06:12 AM
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Default RE: Flap servo options.

Rob

£79.99.

I wanted to jump in with my boat servo comment on Hitec, but held off...

Dave
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Old 01-22-2013, 06:37 AM
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Default RE: Flap servo options.

I am a big JR fan, but cant complain about Hitec 625,645,5625,5645 either have used them for years.

I regard to torque/servo power most modellers dont understand what actually are the forces on the control surfaces, and how to properly install the arms/linkages so you are not making your 25kg servo about 5.

Very few control, surfaces or the wooden blocks stuck to ply which servos are mounted in will take a load of 25kg (more than a 4" concrete block)
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Old 01-22-2013, 06:46 AM
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Default RE: Flap servo options.

Hitec 645MG analog servos. Never had one fail.

Bob
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Old 01-22-2013, 07:35 AM
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Default RE: Flap servo options.

No need for monster servos. I use Hitec 645MG's with properly set up linkages on all my flaps.
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Old 01-22-2013, 10:23 AM
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Default RE: Flap servo options.

Hitec 5645s programmed for 180 degree operation on JMP T-33 (shown), YA F-18 twin, Turbinator XL (125%)
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