Regulator B Ground Wire & Misc Clean Up
TLDR
- Grounded Regulator B to Airframe
- Clean up master relay wires
- Researched on throttle cable connection
Details
Regulator B Grounding
The Rotax instruction says the Regulator B should be grounded to the airframe through the grounding plate.
I made a #12 grounding wire with ring terminals on both ends. Attaching the wire on the regulator end was trivial. Unfortunately I was out of black wires, so I used the red wire but printed a label and attached to the wire.
But to attach it on the airframe, I needed to loosen up the nut on the grounding lug on the firewall, which was just a AN4 bolt. I needed to access both sides of the firewall to loosen the bolt, and re-tighten it. Needless to say, that was painful..
Future work
I have another lug in the same predicament. On the other side of the firewall I have the battery’s negative lug connected to an AN4 bolt for grounding. When I install the engine, I think there will be 1 more cable between the engine and the airframe ground. So I bought a few fully threaded brass bolts and nuts. The plan is to use a nut just to secure the bolts, and another nut to hold down the lugs. In the future when I need to make adjustments to the lugs, I won’t need to crawl under the firewall.
Cleaning Up Master Relay
I also re-did the wires on the master relay and attached rubber boot for extra protection.
Throttle Cable Research
I’m still confused about what part I’m missing to connect the throttle cable to the throttle quadrant.
While the SB24 kit is on order, I did my own research. I am missing a rod end or clevis end. I took some measurements on the throttle cable and the throttle quadrant, so missing part would look like this.
So I went to McMaster and ordered a #10-32 female threaded rod end with 1/4 opening. The shank width is 5/16”, which is larger than the Sling provided bushing. But I think I might not need the bushing at all, since it has its own bearing, and I can just connect it through an AN4 directly. We will see.