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  #1  
Old 04-07-2021, 03:29 PM
rockitdoc's Avatar
rockitdoc rockitdoc is offline
 
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Location: Fort COllins, CO
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Default Starting Sequence for Dual P-Mag Ships

Hi,

Planning my panel and would like to position switches and buttons in a logical order for starting/shutdown.

Those of you with dual P-Mags, what is your sequence?

Thanks,

Scott
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Begun 07-23-20
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  #2  
Old 04-07-2021, 03:54 PM
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Carl Froehlich Carl Froehlich is online now
 
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Location: Dogwood Airpark (VA42)
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Both pMags on, prime (if cold) using the boost pump, then hit the start button. I use a toggle switch for each ignition and a starter push button - hate old school key ignition switches.

Carl
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  #3  
Old 04-07-2021, 04:13 PM
rapid_ascent rapid_ascent is online now
 
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Location: Dublin, CA
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Here is a pic of my planned arrangement.

Click image for larger version

Name:	Ignition_PMAGS.png
Views:	198
Size:	59.6 KB
ID:	10124

The PMAG switches on the right are the momentary test switches.
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RV-7 SB Wings
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  #4  
Old 04-07-2021, 04:22 PM
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mike newall mike newall is offline
 
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Location: Yorkshire, England
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We have a standard ignition/start switch.

On the switch panel with all the lights, strobes, avionics etc, we have 2 switches for the P-Mags.

All our switches are switch breakers to avoid duplication btw.

Master on

Mixture rich

Fuel pump on - throttle advance to show fuel flow.

Fuel pump off - Leave mixture rich.

Throttle 1/4" open

Keep the start key turned until it starts......

Bingo every time when cold !
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  #5  
Old 04-07-2021, 04:28 PM
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Quote:
Originally Posted by mike newall View Post
We have a standard ignition/start switch.

On the switch panel with all the lights, strobes, avionics etc, we have 2 switches for the P-Mags.

All our switches are switch breakers to avoid duplication btw.

Master on

Mixture rich

Fuel pump on - throttle advance to show fuel flow.

Fuel pump off - Leave mixture rich.

Throttle 1/4" open

Keep the start key turned until it starts......

Bingo every time when cold !
No Alt or Avionics switches? If so, when do they get turned on?
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Begun 07-23-20
Emp Completed 11-12-20
Slo Fuse Completed 3-2-21
Wiring and Avionics Begun 3-3-21
QB Wings delayed until ?
Finish Kit expected 7-21
Thunderbolt EXP119 expected 7-21
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Reserved: N52XL
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  #6  
Old 04-07-2021, 04:31 PM
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Quote:
Originally Posted by rapid_ascent View Post
Here is a pic of my planned arrangement.

Attachment 10124

The PMAG switches on the right are the momentary test switches.
No master?
__________________
14A
Begun 07-23-20
Emp Completed 11-12-20
Slo Fuse Completed 3-2-21
Wiring and Avionics Begun 3-3-21
QB Wings delayed until ?
Finish Kit expected 7-21
Thunderbolt EXP119 expected 7-21
2021 Dues Paid
Reserved: N52XL
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  #7  
Old 04-07-2021, 09:07 PM
rapid_ascent rapid_ascent is online now
 
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My marking may be confusing you. My "master" is the PRI ALT switch under the DC Power section. This is a 3 position switch where the middle position is the BAT only. The AUX ALT switch is also a 3 position switch that works similarly, but performs the cross-feed connection and powers the Endurance Bus. This is essentially a Z-13 schematic.
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Ray Tonks
2020 Donation Paid
Titan IOX-370, Dual PMAGs, 9.6:1 Pistons, FM-150
RV-7 Fuselage in progress
* Cabin Interior - In progress
RV-7 SB Wings
* Both Wings fully skinned
* Fuel Tanks Complete - No leaks finally
* Ailerons Complete
* Flaps Complete
RV-7 Empennage - Complete (a little fiberglass work left)
Vans Training Kit # 2 - Complete
RV-7 Preview Plans
Vans Training Kit #1 - Complete
EAA Sheet Metal Class - Complete
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  #8  
Old 04-08-2021, 01:43 AM
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mike newall mike newall is offline
 
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Location: Yorkshire, England
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Quote:
Originally Posted by rockitdoc View Post
No Alt or Avionics switches? If so, when do they get turned on?
Alt is in the Cessna split Master Switch.

Avionics Master after start.
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  #9  
Old 04-08-2021, 01:55 AM
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Location: LSGY
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Quote:
Originally Posted by Carl Froehlich View Post
Both pMags on, prime (if cold) using the boost pump, then hit the start button. I use a toggle switch for each ignition and a starter push button - hate old school key ignition switches.

Carl
Exactly as Carl on my RV-8/IO-360/AFP200/Dual Pmags:

Master/Alt on
L and R Pmags on
Start button
Fly
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  #10  
Old 04-08-2021, 09:45 AM
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Carl Froehlich Carl Froehlich is online now
 
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Quote:
Originally Posted by rockitdoc View Post
No Alt or Avionics switches? If so, when do they get turned on?
So, you want details!

Sequence:
- Left master on
- Right master on
- Left vital bus on (brings up the left EFIS and power to flaps and COMM #2, it will be on during engine start)
- Right vital off (leaves the right EFIS off but more importantly leaves the expensive GTN-650 off as I do not have confidence that it is immune to voltage sag during start).
- Flaps up
- Left ignition on
- Right ignition on
- Throttle cracked open, mixture at ICO
- Boost bump on
- Mixture to full rich for ~5 seconds to prime, then back to ICO (no prime for hot start)
- Start button, crank engine, mixture to half open after engine start
- After start, right vital on.
- Lean to just before engine stops (minimizes plug fouling and stuck exhaust valve issues.

Carl
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