Elevator trim

The standard Sonex elevator trim is what we are implementing, despite all the little tweaks from the standard design, at some point you have to just stop modifying and just build the plane.

OK, a few changes but really just minor. The “swivel” at the control arm end is called out as a standard part from Asuza. It’s fine but we had modified the Bowden cable mounts on the engine and the experience with that design provided an easy modification to an AN bolt that has a more positive clamp on the cable.

We’ll have to add some detail on the design, should it be worthy of being copied.

Below are a couple photos of the design and implementation.

This is the trim tab from the bottom with added reinforcement and showing the swivel constructed from an AN3 bolt. Why not just use the “Z” bend on the bowden center cable? Mike Smith changed his out and the assumption is that the bend could be problematic. Not sure if the change is justified.

The control handle is basically the same as what is shown on the Sonex plans. It works well as is. The only change is the swivel.

Control handle with only minor changes from plans. The swivel is a modified AN3 bolt

Rectifier/Regulator Mounting

Dan researched other builders’ mounting of the regulators and found a heat sink

Notice the dual regulators since the Revmaster has two alternator circuits.

The heat sink is made from extruded aluminum. Mounting of each of the regulators will be through a center of the regulator and then the heat sink. the heat sink will be mounted on the firewall with tabs that will be riveted to the heat sink and screwed to the firewall.