TM WARTHOG Extension for AV-8B Harrier stick - ED Forums
 


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Old 03-08-2018, 06:18 PM   #1
NeoHelios
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Default TM WARTHOG Extension for AV-8B Harrier stick

Hi Community!

Planning to make an extension for my WARTHOG and I'd like to keep as close as possible to the real-life stick height in the Harrier. Will adjust the seat to match. I mainly want to get the stick deflection range right.

Would anyone here happen to know this dimension or point me in direction of technical details?

Garden Hose Connector (WARTHOG-sized thread connector):
https://www.amazon.com/dp/B002VED3KW
PS/2 Extension Cable:
https://www.amazon.com/dp/B0000511E5
PVC pipe:
local hardware store

Thank you!
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Old 03-08-2018, 06:37 PM   #2
NeoHelios
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Alternatively, if there is some standard "30 degrees of stick deflection / range of motion" type of parameter, then I can do trig to find that out. Thanks again!
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Old 03-08-2018, 06:50 PM   #3
NeoHelios
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On a related note, here is an interesting, broad overview of MIL design of aircraft controls:
http://www.dtic.mil/dtic/tr/fulltext/u2/639028.pdf
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A-10C Warthog :: AV-8B Harrier II :: AJS-37 Viggen :: Ka-50 Black Shark

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Old 03-08-2018, 08:06 PM   #4
NeoHelios
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Okay so drawing upon the previously mentioned PDF, one study (1) indicated that maximum stick deflection for the elevator was about 8 inches. Disregarding force and airspeed for generalization. Simply: over eight inches range of motion was possible, so let's peg this at 9 inches for simplicity.

Secondly, another figure (2) illustrating a hypothetical plot of Displacement to Force, calculates up to 30 degrees of deflection. I'm assuming the author chose this maximum limit as it was relevant to the experiment, so I'll accept it as upper limit for my build.

Using basic trig (SOH) where angle is 30 deg (0.52 radians) at 9 inches deflection, I get a hypotenuse of 18 inches. So I shall build my extension from the base's pivot point to the middle of the pistol grip to 18 inches extension.

I know I've answered my own question, here, but I'll leave this one-sided conversation up as a resource to others should they decide to emulate my thought-process, here.

(1) pg. 42, rates of elevator stick motion
(2) pg. 60, Simplified family of curves relating stick displacement, stick force, and airspeed iaw the formula (...)

(...now, to design a weight and pulley system to simulate the forces involved...)

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A-10C Warthog :: AV-8B Harrier II :: AJS-37 Viggen :: Ka-50 Black Shark

CSG-1 callsign: Cloudy

Last edited by NeoHelios; 03-08-2018 at 08:31 PM.
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Old 03-15-2018, 10:59 PM   #5
moespeeds
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Good info thanks.

I'm about to turn down a couple of aluminum adapters this weekend to make my own extension.
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