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  #1  
Old 06-18-2019, 02:18 PM
romanov's Avatar
romanov romanov is offline
 
Join Date: May 2018
Location: Israel
Posts: 108
Default Attimeter or Artificial Horizon - 2.25'' / vacuum / lighted ❓❓❓

Hello Guys,

I am looking for an advice regarding which backup Horizon I should take.
Any good experience you had are highly appreciated. The features I am
looking for:
  • Size: 2.25''
  • Vacuum based
  • Lighted at night(good option, not must)

Thanks a lot
Roman.
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  #2  
Old 06-18-2019, 02:24 PM
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Carl Froehlich Carl Froehlich is offline
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 3,250
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Why vacuum?

Carl
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  #3  
Old 06-18-2019, 02:29 PM
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romanov romanov is offline
 
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Location: Israel
Posts: 108
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Quote:
Originally Posted by Carl Froehlich View Post
Why vacuum?

Carl
I want to be non electric on backup instruments.
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  #4  
Old 06-18-2019, 02:32 PM
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Ed_Wischmeyer Ed_Wischmeyer is offline
 
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Have you looked to see what's available in 2" instruments? And if you're looking for a reliable backup, I'd go with a battery over a vacuum system, not to mention maintenance...
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  #5  
Old 06-18-2019, 02:33 PM
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romanov romanov is offline
 
Join Date: May 2018
Location: Israel
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Quote:
Originally Posted by Ed_Wischmeyer View Post
Have you looked to see what's available in 2" instruments? And if you're looking for a reliable backup, I'd go with a battery over a vacuum system, not to mention maintenance...
Any good link for 2'' options ?
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  #6  
Old 06-18-2019, 04:23 PM
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romanov romanov is offline
 
Join Date: May 2018
Location: Israel
Posts: 108
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Quote:
Originally Posted by romanov View Post
Hello Guys,

I am looking for an advice regarding which backup Horizon I should take.
Any good experience you had are highly appreciated. The features I am
looking for:
  • Size: 2.25''
  • Vacuum based
  • Lighted at night(good option, not must)

Thanks a lot
Roman.
...any concrete devices you use?
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  #7  
Old 07-02-2019, 05:03 AM
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romanov romanov is offline
 
Join Date: May 2018
Location: Israel
Posts: 108
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Quote:
Originally Posted by romanov View Post
Hello Guys,

I am looking for an advice regarding which backup Horizon I should take.
Any good experience you had are highly appreciated. The features I am
looking for:
  • Size: 2.25''
  • Vacuum based or Electric with backup battery.
  • Lighted at night(good option, not must)

Thanks a lot
Roman.
Will ask it one more time, if you have any good recommendation
for the instrument please post.
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  #8  
Old 07-02-2019, 06:35 AM
WingsOnWheels WingsOnWheels is offline
 
Join Date: Mar 2009
Location: Plano, TX
Posts: 2,240
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There aren't a whole lot of options to pick from for 2.25" vacuum AIs, so unless you find a deal, you are going to pay through the nose. If this would be your only Vac instrument, you are far better going electric with a battery backup, it would be cheaper overall and less maintenance.

MGL makes a 2.25" electric attitude indicator. You would have to add a separate backup battery though. The AI also has a turn coordinator function, so it can serve multiple purposes.

Power consumption is listed as 73mA for the instrument and 120mA for the ADAHRS, so it wouldn't take much to power.

TCW sells a backup battery system. Their small one is 3AH, which would run the MGL until you die from old age. Heck, a regular 9v would run it for a good hour or two.
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  #9  
Old 07-02-2019, 06:53 AM
F1R F1R is offline
 
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Location: ____
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For what it is worth the G5 is about as robust as any artificial horizon you can buy for any amount of money. Plus it has it's own back up battery that will out last your fuel endurance. I am not sure how hot the inside of an aircraft parked in the Israeli sun can get, but providing you have a white canopy cover the G5 should be as heat tolerant as your radios.

If you have the connections you might find the back up AI for an F16 but the electrical supply will need modification from 12V DC to high voltage AC high freq. to run it.

Last edited by F1R : 07-02-2019 at 07:00 AM.
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  #10  
Old 07-02-2019, 08:13 AM
Joe Joe is offline
 
Join Date: Oct 2005
Location: Independence, OR
Posts: 428
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Quote:
Originally Posted by romanov View Post
Will ask it one more time, if you have any good recommendation
for the instrument please post.
I had the same dilemma six years ago when I finished my RV-8A and wanted a 2.25" attitude indicator to backup my Dynon SkyView. Electric ones (e.g. Mid Continent) are crazy expensive but I located a used 2.25" TruTrak ADI.




The TruTrak ADI is "rate based" and not exactly the same as an attitude indicator but for my purposes, it's better. If I actually need it I'm more interested in a rate of descent or turn than an actual pitch or bank angle. It has a provision for backup power (12V) but I'm not using it.

It's no longer produced and I don't know TruTrak's current offerings in 2.25" instruments but occasionally I see a used one for sale.

Personally, if I were building now and could possibly fit a 3.5" instrument, I would go with the Garmin G5 as F1R suggests.
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Last edited by Joe : 07-02-2019 at 08:16 AM.
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