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  #11  
Old 12-23-2018, 01:32 PM
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Hartstoc Hartstoc is offline
 
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Quote:
Originally Posted by Walt View Post
Not sure I understand the logic of a panel mounted xpdr so it can be controlled by the panel mounted 750?

I try to avoid extended panels whenever possible, no such thing as too much horse power, or too much leg room.

I suggest you try flying with an Ipad mounted on the CP side to see how it works in real life, personally I like the Ipad mounted on the rail right next to me where my hand is steadier and visibility much better.
I’m not making the panel larger, it has had the 1.5” height increase for 10 years- plenty of legroom for my 5’-10” frame but you are right would crowd very tall pilot’s legs. Van’ssells undrilled 14” blanks with flange so you can dial in panel size. Although the plywood model is same as my original, I’m raising the bottom about 1/2” in the metal one because I have a bit more space than I really need, so I will end up 1” over standard height.

The remote GTX45R is great, but cannot be controlled by the GTN750- you have to have the certified unit for that. Ifyou lose the G3X, you are stuck with current entries on remote com and transponder. I decided it is better to have direct hard-button control of that, the autopilot, and the audio panel, all of which have remote conterparts, so that I don’t haveto go digging around on the G3X every time I wan’t to change settings. That way, the G5 provides full backup if the G3X goes belly up. The panel mount 507 also allows auto-trim and other AFCS features not available if servos are controlled only be G3X.

As for iPad on CP side, I’ve been doing just that for more than a year and love it. Will be even better with it nearly five inches closer- ram mount allows glare free, head on viewing.
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RV-7A (bought)
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  #12  
Old 12-23-2018, 01:44 PM
BillL BillL is offline
 
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Quote:
Originally Posted by Walt View Post
Not sure I understand the logic of a panel mounted xpdr so it can be controlled by the panel mounted 750?
Doesn't the 750 still need a certified transponder to receive traffic, weather, and enable use of the touch screen to change the transponder? or - is there a certified remote transponder with all that?
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RV-7
Lord Kelvin:
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and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
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  #13  
Old 12-23-2018, 02:16 PM
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Walt Walt is offline
 
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Quote:
Originally Posted by BillL View Post
Doesn't the 750 still need a certified transponder to receive traffic, weather, and enable use of the touch screen to change the transponder? or - is there a certified remote transponder with all that?
The GTX45R, controlled easily by the G3X, provides weather & traffic to both G3X screens as well as the 650/750.
And of course like most G3X products, the GTX45R costs less than the panel mount GTX345.

The G3X also has full reversionary mode, so if the PFD fails the MFD automatically reverts to the PFD for xpdr control.
So why do I need to control the xpdr from the 750? (no reason I can think of)

If I'm actually IFR and lose the G3X screens, the least of my problems is changing the squawk code for ATC, and if I'm VFR who cares.
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Walt Aronow, DFW, TX (52F)

EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154

Last edited by Walt : 12-23-2018 at 02:27 PM.
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  #14  
Old 12-23-2018, 03:07 PM
snoop9erdog snoop9erdog is offline
 
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Quote:
Originally Posted by Walt View Post
For those interested in the behind the scenes look at things.
(some of the sub-panel was previously cut out hence the large than nec holes in some areas)




Walt. Do you have any photos of the center stack radios and how the racks are supported through the center and on the back side? Thx
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  #15  
Old 12-23-2018, 03:30 PM
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Hartstoc Hartstoc is offline
 
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Quote:
Originally Posted by Walt View Post
The GTX45R, controlled easily by the G3X, provides weather & traffic to both G3X screens as well as the 650/750.
And of course like most G3X products, the GTX45R costs less than the panel mount GTX345.

The G3X also has full reversionary mode, so if the PFD fails the MFD automatically reverts to the PFD for xpdr control.
So why do I need to control the xpdr from the 750? (no reason I can think of)

If I'm actually IFR and lose the G3X screens, the least of my problems is changing the squawk code for ATC, and if I'm VFR who cares.
Walt- I was not suggesting that YOU need GTN750 control of the transponder- as you say you are ok if one G3X fails. I elected to build around a single G3X to save the weight and space of dual G3X?s and backup batteries, so my redundant pathways are GTN+G5+507 or G3X+remote com+507. In either case I have full communications, transponder, and flightplan functionality, with considerable help available from the iPad. The G5 is a marvel if adequately supported, and its backup battery is the only one in my system. (i do have twin main EarthX- fully redundant)- Otis
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RV-7A (bought)
Built Monnett Moni
Frmr Test Pilot/Author CAFE APR's:
RV-8A, S-7C, Europa, Glastar.
-2019 VAF donation!!-
"RV-Fun is inversely proportional to RV-Weight!"
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  #16  
Old 12-23-2018, 03:58 PM
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Walt Walt is offline
 
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Quote:
Originally Posted by snoop9erdog View Post
Walt. Do you have any photos of the center stack radios and how the racks are supported through the center and on the back side? Thx
The 750 is supported with a strap on the back, the audio panel is so light it doen't require a rear support, sorry thats it for pics.
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Walt Aronow, DFW, TX (52F)

EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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  #17  
Old 12-23-2018, 05:11 PM
BillL BillL is offline
 
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Nice attention to details, Walt, might want to catch that 650 dimmer label, probably fixed already. I was told my 23es with the GDL39R would not send weather and traffic etc to my GTN650 due to cert, good to see that is not the case. It looks like my piggy bank should be started for a GEN III G3X system. I only have 70 hrs and obsolete already. built too slow. The PTT on the panel is a very good idea. So many good detail ideas!!
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Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
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  #18  
Old 12-24-2018, 07:08 AM
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I'm curious, when you do a big retrofit like this, what is your approach to how much pre-existing wiring to try to save? Lean toward rip it out, or try to save every usable connection?
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  #19  
Old 12-24-2018, 08:57 AM
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Walt Walt is offline
 
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Quote:
Originally Posted by scard View Post
I'm curious, when you do a big retrofit like this, what is your approach to how much pre-existing wiring to try to save? Lean toward rip it out, or try to save every usable connection?
I rip out about 95% of it usually. It seems that in general, many folks have problems doing a nice quality electrical system.
When I do a panel I'm committed to doing the best job possible and that it not only looks and works good, but is safe and reliable.
Most of my panels are IFR and literally your life may depend on it, so I take it pretty serious.

Along that same line every IFR panel I do goes out with dual ADAHRS, a G5, backup battery, and a new B&C alt/reg.
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Walt Aronow, DFW, TX (52F)

EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154

Last edited by Walt : 12-24-2018 at 11:44 AM.
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  #20  
Old 12-24-2018, 09:50 AM
2Big2Ride 2Big2Ride is offline
 
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Default Planning - Budgeting

As an aspiring pilot and aspiring builder that hasn't started either journey, I read through the original alphabet soup with interest. I then spent some time researching the components and think I understand what all the visible and listed components are and what functions they perform. Not knowing what additional servos, sensors, or components are required, looks like that arrangement is just shy of $43k. What is a fair estimate for the high-end of avionics on a future build, $50k?
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