Original Posted By: "Greg Cardinal"
For those that understand electrical stuff please take a look at theattached sketch of my planned electrical system. I have not included themags. Please share any flaws or concerns because this is an area I know verylittle about. Years ago I installed a cigarette lighter in my boat, it onlyworked when the spot light was on and I burned my nose testing it! Not sureon the ammeter hookup. Also would appreciate input for installing avoltmeter instead of the amp gauge.Thanks!JackJack TextorDes Moines, IA________________________________________________________________________________
Pietenpol-List: Electrical Layout
RE: Pietenpol-List: Electrical Layout
Original Posted By: owner-pietenpol-list-server(at)matronics.com
George thanks for the info! I googled flashing the field and may leave thatto someone that knows more about it.Also when you mention smaller breakers,should the wire size be reduced, I think Bengalis stated that relationship? Jack Textor Des Moines, IA _____
George thanks for the info! I googled flashing the field and may leave thatto someone that knows more about it.Also when you mention smaller breakers,should the wire size be reduced, I think Bengalis stated that relationship? Jack Textor Des Moines, IA _____
Pietenpol-List: Electrical Layout
Original Posted By: Michael Perez
Re: Pietenpol-List: Electrical Layout
Original Posted By:> Jack
Good ideas George, thanks. My T&B says 13.75v and .8 A. Also for the voltmeter does it connect between ground and bus bar with no fuse?Thanks for all the help!Sent from my iPadJack TextorOn Jan 16, 2013, at 2:54 PM, George Abernathy wrote:> Hello Jack,> > The wire sizes are ok. Larger is better for voltage drop. The main purpose of circuit breakers seems to be protecting the wire. Most aircraft radios and instruments die pretty quietly. > > The wire for the trim could be larger for ruggedness and for voltage drop. > Motors pull a lot of current on when they start. Usually about 6 times the running current. That does not mean the circuit breaker or fuse needs to be 6 times the running current. Circuit breakers and fuses are made to support the higher current during motor start. > > Wire tends to be sized to fit the connectors on the various things. For instance the encoder will most likely have a sub > D connector. 22 and 24 gauge fit nicely in the solder cups or crimp pins. The newer radios have high density sub D connectors and a 22 gauge is going to be difficult to fit. For power they sometimes supply a special pin that will accept a larger wire. > > Power and ground wires need to be big enough for voltage drop and still fit in the connectors. The manufacturers of most aircraft stuff are pretty good at recommending the minimum wire sizes and circuit breaker requirements. One place that can be problems is encoder power. The power switches in the older transponders weren't strong enough for the solid state encoders. They had or may still have a heater in them to stabilize the altitude sensors. > >
Good ideas George, thanks. My T&B says 13.75v and .8 A. Also for the voltmeter does it connect between ground and bus bar with no fuse?Thanks for all the help!Sent from my iPadJack TextorOn Jan 16, 2013, at 2:54 PM, George Abernathy wrote:> Hello Jack,> > The wire sizes are ok. Larger is better for voltage drop. The main purpose of circuit breakers seems to be protecting the wire. Most aircraft radios and instruments die pretty quietly. > > The wire for the trim could be larger for ruggedness and for voltage drop. > Motors pull a lot of current on when they start. Usually about 6 times the running current. That does not mean the circuit breaker or fuse needs to be 6 times the running current. Circuit breakers and fuses are made to support the higher current during motor start. > > Wire tends to be sized to fit the connectors on the various things. For instance the encoder will most likely have a sub > D connector. 22 and 24 gauge fit nicely in the solder cups or crimp pins. The newer radios have high density sub D connectors and a 22 gauge is going to be difficult to fit. For power they sometimes supply a special pin that will accept a larger wire. > > Power and ground wires need to be big enough for voltage drop and still fit in the connectors. The manufacturers of most aircraft stuff are pretty good at recommending the minimum wire sizes and circuit breaker requirements. One place that can be problems is encoder power. The power switches in the older transponders weren't strong enough for the solid state encoders. They had or may still have a heater in them to stabilize the altitude sensors. > >
RE: Pietenpol-List: Electrical Layout
Original Posted By: owner-pietenpol-list-server(at)matronics.com
Jack,Attached is a pdf of my 601XL electricals. I have an O-200 on it so the circuit for your Piet should be similar.If you connect the ammeter as shown, you will not get the very large starter current pushing the needle off the scale.CheersPeter Wonthaggi Australiahttp://www.cpc-world.com
Jack,Attached is a pdf of my 601XL electricals. I have an O-200 on it so the circuit for your Piet should be similar.If you connect the ammeter as shown, you will not get the very large starter current pushing the needle off the scale.CheersPeter Wonthaggi Australiahttp://www.cpc-world.com
Pietenpol-List: Electrical Layout
Original Posted By: George Abernathy