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  • Author Author: phoenixcomm
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NexGen: Rudder Pedals

phoenixcomm

Well, you know you need rudder pedals to perform coordinated turns, and differential braking. I used to have this solved with a  Thrustmaster  RCS (Figure 1), But in moving etc they got strayed, misplaced or stolen. Sometime in 2011 I came across this hot mess (Figure 2) using two (2) air cylinders cross plumbed, ensures device centered.

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Thrustmaster RCS

Figure 1

A good idea, bad implementation.

Figure 2

CH pedals

Figure 3

CH pedal internal

Figure 4

Athough the pedals are fixed (not good) the idea is brilliant. The other day while scrounging around at a local Goodwill store, I came up with a set of CH Products pedals (Figure 3). So here is the plan...

  THE ANALYSIS:  >The end unit should look somewhat like figure 1. That is one bar anchored in the center on a pivot. This has a mounting plate on either end mounted with a pivot. then the top can just be a rod that is also mounted on the plates and has a center pivot as well. This gives us the movement that we require for aircraft pedals.The CH pedals will be affixed to plates so the end results resembles Figure 1. The CH pedals cable only has 4 wires and will have to be replaced by a standard DB-25 cable that I have laying around. The unit will need 3 axis, two for brakes (one each pedal) and a center for the rudder

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Close Up of the Mount

Figure 5

Crosswind pedals

Figure 6

If you look at figure 4 you will see the pedal sits on a post coming up through from the base the pedal pivots on the white arm. This could be replaced with a hunk of DelrinRegistered plastic or some soft brass.  The two pivot points are a pair of sealed bearings. Figure 6 is a picture of the new kid on the block.

8/1/2015 In response to mcb1. Figures 7 and 8 are the real things from a Beechcraft. You will notice that each pedal is attached to a bar with an arm. You will also notice the brake cylinder mounted to pedal as well. this is for differential breaking. In Figure 9 you can clearly see them with the guts out of the way.  You now can see clearly the yellow actuator arms. These would be connected to a clevis on the tail. So you now can use one pot or two. Now this is where you could mount the two air cylinders, connected to each other (Figure 2). The two air cylinders would keep the pedals centered, and aligned without the need for the second cross bars (Figures 1, 6).


 

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Beechcraft  Pedals: Top Right

Figure 7

Beechcraft Pedals: Top Rear

Figure 8

Beechcraft Pedals: Stripped

Figure 9

 

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Beechcraft Pedals: with BellCrank

Figure 10

Beechcraft Pedals: Showing the Geometry

Figure 11

8/2/2015 Ok I just posted the blurb below and found these two photos (Figures 10, 11). This will make my life easier. I can mount my Rudder Potentiometer via the center of the Bellcrank. For auto centering, I can mount my two air cylinders on each end of the  Bellcrank.  I hope this clears thing us for the non-aircraft types,  and my self..  lol

~~Cris

Parents

  • You might want to look at late model automobiles for the pot.

    Most electronic fuel management use a 5k pot along with excellent mounting and linkage arrangements.

     

    Apart from some models which fail, there should be lots getting junked.

     

    Mark

  • in reply to mcb1

    ok ill bite where would the pot be in the car?? with what im showing you the main pedal mount in the center is where the pot is mounted sometimes the pivot is the pot itself... (short life) please look at the post as I have made some changes... and for pots you can't beat the older Allen Bradley J series. I can get them all day on eBay for about 5 bucks.image

  • in reply to phoenixcomm

    ok ill bite where would the pot be in the car??

    Usually the throttle position sensor, and fitted on the engine right by the Air Flow sensor.

     

    Throw these into Google and check the images ..there are many different types, mountings and actuation methods.

    "throttle position sensor" or "rotary position sensors in cars"

     

    Mark

  • in reply to mcb1

    I get that pressing one pedal alters the rudder, and I assume in the real aircraft pushing on both does the brakes.?

     

    Are you trying to simulate both actions.?

     

    Mark

  • in reply to mcb1

    @Most(like 98%) aircraft have the rudder and braking functions combined into one set of two pedals. To operate the rudder you press on the bottom part of the pedals, so that they slide back and forth on tracks, and to operate the brakes, you press the top part of the pedals so that they rotate towards the floor. The left pedal operates the left wheel brake, and the right pedal operates the right brake, so you can use differential braking to turn the plane. For rudder operation, the motion of the two pedals is locked together (i.e. press on the right pedal for right rudder, and the left pedal moves aft while the right pedal moves forward). Because of the two different motions (rotation for brakes versus sliding for rudder) there isn't a problem with hitting the brakes when you want rudder or vice versa. Typical early training is to operate the rudder using your toes on the lower parts of the pedals, so and to only put your whole foot on the pedal to actuate the braking mechanism. User mkwt - Aviation Stack Exchange

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  • in reply to mcb1

    @Most(like 98%) aircraft have the rudder and braking functions combined into one set of two pedals. To operate the rudder you press on the bottom part of the pedals, so that they slide back and forth on tracks, and to operate the brakes, you press the top part of the pedals so that they rotate towards the floor. The left pedal operates the left wheel brake, and the right pedal operates the right brake, so you can use differential braking to turn the plane. For rudder operation, the motion of the two pedals is locked together (i.e. press on the right pedal for right rudder, and the left pedal moves aft while the right pedal moves forward). Because of the two different motions (rotation for brakes versus sliding for rudder) there isn't a problem with hitting the brakes when you want rudder or vice versa. Typical early training is to operate the rudder using your toes on the lower parts of the pedals, so and to only put your whole foot on the pedal to actuate the braking mechanism. User mkwt - Aviation Stack Exchange

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