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Long & Skinny Hitec Servo arms

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Old 05-17-2010, 09:23 PM
  #1  
Airmaster23
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Default Long & Skinny Hitec Servo arms

Hi,

I'm building the Hangar 9 Spitfire and I'm at the part where you install the aileron servos. I'm using a Hitec HS-325HB servo.

The servo is attached to a hatch door to conceal the servo.

The arm must be long enough to go through a slot in the hatch and then attach to the quick connector.

The only servo arm (that I have) long enough is the adjustable one with the bracket. However, there's too much play for me to justify using this type of servo arm.

Does anyone know if the Hitec horn #26 or 28 would work? See http://www.hitecrcd.com/products/ser...-hardware.html

I know that Dubro makes servo arms, but they seem too thick to work in this application.

Thanks,
Dan

You can see the pictures here: http://www.rcgroups.com/forums/showthread.php?t=1241080
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Old 05-18-2010, 05:18 AM
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A.T.
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Default RE: Long & Skinny Hitec Servo arms


ORIGINAL: Airmaster23 Hi, I'm building the Hangar 9 Spitfire and I'm at the part where you install the aileron servos. I'm using a Hitec HS-325HB servo. The servo is attached to a hatch door to conceal the servo. The arm must be long enough to go through a slot in the hatch and then attach to the quick connector. The only servo arm (that I have) long enough is the adjustable one with the bracket. However, there's too much play for me to justify using this type of servo arm. Does anyone know if the Hitec horn #26 or 28 would work? <snip>Thanks, Dan
The adjustable arm is great on throttles or control surfaces up to say. 40 size models.

#26 No. #28 Yes,a little thicker thanthe regular horn.
#35 is perhaps a better option.
Thefollowing may assist:
Servo - Horn arm Spline Count and Inter Brand Compatibility
Hitec (Apollo & old Ace Giant are prior name change toHitec) =
Feather HS35, 45, HS-50 & HS-55 = 16 Spline Servo Horn.
Micro - HS-56HB only = 23 Spline
Micro Horn & Hardware Set for HS60, HS81 & HS85 = 24 spline
Micro - HS-65HB & HS-65MG = 25 spline
[Futaba 25 spline shafts (& horns) have a larger diameter]
Standard Hitec Servo = 24 spline
Mega Horn & Hardware set for HS-805BB+ & 815BB = 15 spline.

Regards
Alan T.
Alan's Hobby, Model & RC FAQ Web Links
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Old 05-18-2010, 06:51 AM
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airbusdrvr
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Default RE: Long & Skinny Hitec Servo arms

Alan always, and I mean always gives good advice However, I would never use the adjustable servo arm on a control surface. It is just to easy for the screw to eventually get a little loose and then the arm start moving.
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Old 05-19-2010, 02:35 PM
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gzkpez
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Default RE: Long & Skinny Hitec Servo arms

Maybe one of the SECRAFT arms will work for you. http://www.secraft.net They are made in Korea but have a US distributer http://www.secraftusa.com ships fast. (in my experience) They seem well made.

They are well made, but remember as Alan wrote not all Hitec Servos have the same splines.
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