Zenith Super Duty - Mounting the Elevator Servo (Ep81)
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- Опубликовано: 7 авг 2024
- Today I'm mounting the elevator servo in the Zenith Super Duty. I had to redo my original mounting design because I switched from a servo with an arm, to a servo with a capstan.
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#zenithsuperduty #kitplane #zenithaircraft 
Развлечения
When you said "saving money for the build" i personally felt that, and it made me feel better lol thanks again for your videos
You say “finally” mounted… I am just thrilled that you share your process with us. Is there a version of “get there it is” for building? I am always amazed that you have the time to share this with the world. Thanks, Mark!
Awesome work, as always.
(I just remembered, I have to run to IKEA...)
HAHAHA you saw that, huh?
I’m not a airplane builder or even a pilot but I sure enjoy your videos
Thanks!
Gripmats are great for musical instrument setup and alignments.
A boat's capstan or windlass helps raise (weigh) or slowly drop (walk back) an anchor.
Before their names became interchangeable, capstans had a horizontal rotation axis and windlasses had a vertical rotation axis.
I love seeing this come together so beautifully. I think I would choose the zenith over anything else just for getting to put it together. Great work!
It’s a really fun project!
@@KitplaneEnthusiast I'm excited to see your opinion on a back to back comparison. On how they fly, and if you prefer building one over the other.
Building airplanes is good practice to put your IKEA bookshelf together 😉
In EP78, you commented that you liked the front-mounted bracket from Dynon, since it allowed for easier safety wiring of the screws. But in this video, you back-mounted the servo. Why?
Nevermind, I just saw in EP84 that you switched it back.
I really like the capstan option. Seems like a good choice. Do you happen to know how the safety features of the servo work? For example, if the gears of the servo were to seize up for some reason is there a clutch that slips that you can overpower to move the elevator? Or a shear pin? Or maybe the cable slips on the capstan? Does the servo have a travel limit or can it rotate constantly?
Thanks for sharing, I really enjoy your videos.
The Dynon servo has a sheer pin that would snap if the gears locked up.
If the servo fails and locks up how can you still control the elevator?
All servos have a sheer pin that will snap and basically disconnect the servo.
My question is why would you need the full 5 inch travel input to your elevator using the autopilot? The auto pilot is only used to maintain altitude or maintain a rate of climb or descent, in my opinion the need for a full 5 inch travel would never be required. Sure if you are making large elevator movements with the autopilot off will you require full elevator travel.
Since it is connected directly to the elevator (as the video shows), if the servo didn't have the full 5 inches of travel, it would either limit the movement of the elevator, or it would come apart the first time the pilot tried getting full deflection out of the controls.
@@spyrosg3172 The Auto Pilot also has a LEVEL function - hit this button and it should level your aircraft from any unusual attitude. lots of control deflection is a good idea if the plane is slow.
Interesting design. I'm curious regarding the resistance on the elevator cable. How many loops of cable go around the capstan?
The capstan will spin freely when the AP is not activated. You shouldn't be able to tell the AP is even there when it is not powered up. The capstan locks to the servo (motor) when power is applied, and then the AP does it's thing. There is really only one loop around the capstan - it's probably fed through the hub and locked in place with a grub screw.
@@jamesfisher7010 Thank you for clarifying the way it works. Please allow me to return the favor. My only experience with servos, capstans, and cables is in the elevation control for an amateur telescope control system. In that example, the motor is geared and the capstan is firmly secured to the shaft. In order to release the cable and to cease control, a tensioning clutch must be released which relaxes the cable around the capstan. Also, in the telescope system, there are two loops around the capstan. Your explanation describes the differences. I do wonder how the capstan becomes engaged with the motor in the AP. Is there a solenoid?
A very basic question. What does the servo do when the control is in normal operation? Does it freewheel? Is there drag on the contols?
Yes there is small amount of drag on the system. Of course I haven't flown this yet but supposedly it's not noticeable in flight.
Mark, you mentioned fiberglass fairing and that made me think of something that bothers me about the Super Duty. Below the engine cowling where the front wheel attaches, the Super Duty cuts off and the frame appears to stick below the aircraft a couple of inches. I guess it is just an aesthetic issue to me but it seems like there should be some connection from that point to the rear of the plane where it begins to sweep up. When you look at it in profile it just feels incomplete. I'm not sure if it could be corrected through a change in the original design or if a fairing could be added that might also improve airflow. I'll forever look at the Super Duty and think it is poorly designed.
I think you are referring to how the bottom of the cowl hangs below the bottom fuselage. It's funny because I actually like how it looks. Everyone sees things differently and I certainly agree that the SD isn't a sleek design, but one of the things that I really liked about the SD (and the Cruzer) is the boxy look and the sharp lines. I just think it is really cool looking!
Mark,
The tension and friction of the cable on the drum of the capstan allow for its operation however, does it lose its neutral/center position overtime from minute slipping? If so does the Dynon compensate for this or is there some sort of homing process like running it to full travel each direction?
I'm not sure if the cable would actually slip in the block. I suppose it's possible. The cables will stretch over time so I'm sure every once in a while the blocks might need adjusted and things tightened up. I've never used this set up before so we'll see!
@@KitplaneEnthusiast Thanks for the reply, I'm definitely interested in the integration with the Dynon. I'd really like to see some more detailed video of just using the Dynon system in your Zenith, as well as tips for the setup. Best, Jason
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