![]() |
I think you should ask yourself if you are comfortable passing control of your trim and flaps to a multi-purpose piece of uncertified software with no effective cut-out. I know both Dynon and Vertical power have a fine reputation for building reliable products, but just because you can do something does not mean you should. Failure (runaway) of trim or flap control at cruise speeds could make life rather too interesting.
From my perspective these 2 functions are things I will assign to single function systems to ensure reliability. My flaps are currently actuated with a large handle, and will be controlled by a simple switch directly to the motor. I currently have a manual trim, and will have a single purpose box to vary the trim speed with flap position that can be switched off easily. I don't think auto-trim is very useful in RVs - the trim force over the entire speed range is typically low, so the autopilot servos rarely run out of authority. Manually trimming is not a huge overhead to prevent some of the failure scenarios possible with an integrated (simplex with unknown failure monitoring) auto-trim and autopilot. David - you might like to ask the LAA their view on auto-trim using the autopilot. Pete |
Quote:
I developed an autotrim controller that works with the SkyView systems as a separate stand alone box. If the EFIS fails, it works as a standard trim controller with speed scheduling determined by flap position. It also has fail safe/recovery mode. This agrees with your premise. However, I think your assessment of the servo motor authority over the RV speed range is incorrect. Before Autotrim, I was getting constant demands for manual trim intervention from the Dynon Autopilot in my Harmon Rocket. With my autotrim controller, I can change throttle settings and let the autotrim take over. I can even engage the autopilot with large trim offsets so that the servos slip and my autotrim controller will converge to neutral. This means that I can use smaller, lighter servo motors and I have a lot fewer distractions in the cockpit. My SOP is take-off, level off at 2000 feet (about 30 seconds later in an HRII), slap on the autopilot and let the trim take care of itself while I tidy up the cockpit. I would never go back to manually controlled trim with an autopilot. An autopilot without autotrim is so last century. |
Quote:
:cool: |
Quote:
It works only with Dynon SkyView systems. The fundamental difference with the Dynon control head and my box is that mine is remotely mounted and takes no (or minimal) panel space. I developed it about a year before Dynon rolled out their unit because I was impatient and enjoyed the challenge. I don't know what algorithms Dynon uses for their controller but the math I used for mine required a high speed processor with critical hand-coded operations. I published the algorithm in the datasheet, if anyone is interested. It's all based on an open source hardware platform, but this particular code is proprietary. Dynon was helpful in pushing me in the right direction, even though they had their own development underway. |
Quote:
|
Quote:
Quote:
:cool: |
Breaker
Quote:
Now I'm confused again. The initial question was whether to connect to the Dynon or the VP-X. The recommendation was to hook up all the wiring to the Dynon. I looked it up and drew the wiring diagram according to the Dynon install manual. All the wires go to Dynon connectors. There is no breaker shown. Maybe the Dynon EMS has a breaker or in my case, a circuit on the VP-X. If the latter, a switched VP-X circuit would power down the EMS. Please explain. What did I miss? |
Larry,
All circuits in a plane have circuit protection. So in your case, we mean turn off the circuit on the VP-X that drives pin 9 on the SV-AP-PANEL. This circuit protection device is shown on Figure 117, Page 18-7 in the install manual. This does not power down all of SkyView, the EMS, or even the SV-AP-PANEL. This just removes power from the circuit that can move the trim motor. |
Quote:
Vern |
Thanks
Quote:
|
| All times are GMT -6. The time now is 05:24 AM. |