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Thanks Charlie. So if I understand you correctly, there still is a flyback current from the motor, it just isn't an issue because the contacts on the starter contactor are more robust than a normal r ...

Thanks for that Bob. I read the article in its entirety. But I didn't see where it answered my question. To be clear...I understand why we put diodes across the coil of a contactor or relay. My qu ...

It's common (or maybe not so common) knowledge that spark suppression diodes are a good idea on relays and contactor coils. But I've found precious little discussion about putting one on the starter ...

Building an RV-7a with fiberglass wingtips. Had planned to use one Bob Archer VOR antenna (AeroElectric connection chapter 13) in each wingtip. For reasons I won't get into, I'm going to use a uAvio ...

Some more data points:

I have several of these devices from 3 "manufacturers"

Vendor Written on device Measured
-------------------------------------------------------- ...

user9253,

I didn't understand your calculation.

I calculate 69 volts.
E x E = 33.3 x 12 x 12
E = 69 volts

Where does 33.3 come from?

If I use the 4W number:

V = P/I = 4/0.029 = 137 ...

Bob,

29mA? That's only 0.35 watts. Could it be 290mA?
What's the physical sized of this device. 4W dissipated
into a small mass gets pretty hot in a hurry.

I noticed that as well. But that ...

This is a non-aviation question so please forgive my blatant request for info.
I have a solenoid rated as follows: 12VDC 29mA 4.0W (printed on the coil). I don't have any more information about it. ...

Hi All,

So, with 3 ground connections (battery, fuselage, engine), which of the following permutations would be best?

1) Battery to fuselage, fuselage to engine
2) Battery to engine, fuselage t ...

Should I be concerned about mounting a transponder antenna near fuel lines/fittings?

the teeth of the lock washers should bite through any paint/primer into the surface of the skin.

Thanks Charlie. I know this makes a good D.C. ground, but I'm not sure how well it grounds at 100+ ...

Hi,

Comant instructions for a comm antenna installation says to mount the antenna base directly to the skin for proper electrical bonding. Makes sense to me. Then they include a cork gasket with ...

Happy holidays all.

I'm using a Garmin 696 and want to use the "data out" to drive a TruTrak autopilot, and an ACK ELT. Does anyone know if I can just parallel all these data lines toget ...

This catalog http://www.f16pit.com/docs/honywell_tl.pdf shows electrical ratings on the 1st page. Am I correct that this is the capacity per pole? Or is it the total capacity of the switch?

I read a Mid-Continent manual that advised turning off the gyro 5 minutes before doing aerobatics. I assume the 5 minutes is to let the gyro spin down. I have 3 gyros. I don't want to use 3 switches, ...

Once you depart from this convention, it's some other kind of bus
that gets treated like other fat-wire fed busses in the
airplane.

Ditto Paul's question. And does this mean it should be prot ...

Hi,
Can anyone tell me how the voice/ID is modulated for a VOR. Is it just plain vanilla AM? I want to bench check my wiring.

Thanks

OK now. Thanks all. It must have been down momentarily when I tried to access it.

do not archive

Does anyone know what's going on with the B&C website?

I would have thought that starting the engine with the alternator field powered would load the engine, not the alternator. And with a marginal battery, in cold weather, it might make a difference as ...