Elevator Trim Speed Controller

[Janekom]

As an advertiser I thought it will be ok to post this.

There are many thousands of RVs flying with electric elevator trim and basic panels. Read - no fancy auto trim etc. They are all very sensitive and quite responsive when you press up of down. Some time ago I have designed two circuits. Both a proper DC speed controllers.

One is a very small three wire speed controller where you can set the speed on the circuit board with a screwdriver.

The second one is a bigger speed controller with a built in "relay deck" as well as run away protection. It will stop after 4 seconds. There is also an output where one can reverse the trim with a small extra switch.

In order to test them initially for ruggedness and current handling, I used a Vans flap actuator with a lot of mechanical load on it instead of the small Ray Allen servos. It worked 100%.

The small one would be about $28 and the big model about $80 in both cases postage included. Before I list and advertise it with leaflets and all, I thought it will be nice to see the outcome of a poll.

[vlittle]

I don't know if this is helpful, but here is a complete schematic of a 2-axis speed-schduled trim controller: http://www.vx-aviation.com/sprocket/.../M-PWR-2AT.pdf.

When used with a SkyView system, it also provides auto-trim control by extracting autopilot information from the SV serial data stream. Speed information is extracted the same way, or from a flaps or airspeed switch.

[ChiefPilot]

Originally Posted by vlittle

I don't know if this is helpful, but here is a complete schematic of a 2-axis speed-schduled trim controller: http://www.vx-aviation.com/sprocket/.../M-PWR-2AT.pdf.

When used with a SkyView system, it also provides auto-trim control by extracting autopilot information from the SV serial data stream. Speed information is extracted the same way, or from a flaps or airspeed switch.

Where can the source code for this be downloaded?

[vlittle]

Originally Posted by ChiefPilot

Where can the source code for this be downloaded?

Hi Brad. I don't want to Hijack this thread. I will send you a p.m. I have all of the source code and hardware files.