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  #11  
Old 04-13-2016, 12:27 PM
jwilbur jwilbur is offline
 
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Quote:
Originally Posted by Ironflight View Post
... You might see a lot of OAT probes in NACA scoops on RV's, but that doesn't mean they are reading correctly. Those of us that have actually TESTED to location know that it doesn't work if you want accuracy.
Does this include tests on probes mounted in rear scoops? Any data on that location?
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  #12  
Old 04-13-2016, 12:42 PM
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Auburntsts Auburntsts is offline
 
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Quote:
Originally Posted by Bluelabel View Post
It was already wired into our harness. Which meant fishing the actual probe itself out to the wing.
Once flying next month I'll do some testing and post if there's any discrepancies... I suspect that at the speeds the 10 goes, there won't be any issues, but I'll find out.
Ok. I was in your situation and simply cut the harness, mounted the probe to the inboard most right wing access panel and spliced the harness back together--easy-peazy. No issues in a 100 hrs.
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  #13  
Old 04-13-2016, 01:27 PM
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Bluelabel Bluelabel is offline
 
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Quote:
Originally Posted by Auburntsts View Post
Ok. I was in your situation and simply cut the harness, mounted the probe to the inboard most right wing access panel and spliced the harness back together--easy-peazy. No issues in a 100 hrs.
Who knows. Maybe I'll do that. I've got a small window next month before its scheduled for paint. Might just run a new wire and leave the old one.
FWIW Paul, the one in my Naca is for my backup EFIS which I'll only refer to once in a while and won't be too concerned if it's TAS is off. If I'm staring at that screen, all I'll care about is altitude and indicated airspeed. 😜
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  #14  
Old 04-14-2016, 08:58 AM
jwilbur jwilbur is offline
 
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Default Probe in rear NACA?

So let me ask one more time before just giving it a try. For those who installed AFT NACA scoops to feed an overhead console in an RV10, has anyone tried putting an OAT probe in a rear NACA scoop?
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  #15  
Old 04-14-2016, 10:08 AM
rapid_ascent rapid_ascent is offline
 
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Slight thread deviation but oat related. I have an optional OAT sensor for my chronometer. I decided to mount it in one of the wing access panels per previous discussions here on VAF. I didn't like that it wouldn't have any support other than the RTV that is used to hold it in place so I found a small snap bushing that it would slide into. My question is how far should this thermocouple extend out into the airstream to be effective / accurate?
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  #16  
Old 04-14-2016, 10:52 AM
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1001001 1001001 is online now
 
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Quote:
Originally Posted by rapid_ascent View Post
Slight thread deviation but oat related. I have an optional OAT sensor for my chronometer. I decided to mount it in one of the wing access panels per previous discussions here on VAF. I didn't like that it wouldn't have any support other than the RTV that is used to hold it in place so I found a small snap bushing that it would slide into. My question is how far should this thermocouple extend out into the airstream to be effective / accurate?
Which chronometer/OAT do you have?
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  #17  
Old 04-14-2016, 02:55 PM
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Bill.Peyton Bill.Peyton is offline
 
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I tried the front NACA and it will read high. It doesn't work there. I suspect you may find the same situation for the rear. There is a lot of heat flowing around the fuse in flight. The air coming out of my overhead vents, which is fed by the rear NACA vent, definitely "feels" warmer than ambient as does the front.
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  #18  
Old 04-14-2016, 04:44 PM
rapid_ascent rapid_ascent is offline
 
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Flight Data Systems GT-50. The thermocouple is just an encapsulated unit 1/8" in diameter and maybe an inch long.
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* Fwd Fuselage Complete
* Mid Fuselage Complete
* Aft Fuselage Complete
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)
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Shop Setup - In Progress (Gathering Tools, Never Complete)
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  #19  
Old 04-14-2016, 06:43 PM
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Bluelabel Bluelabel is offline
 
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Quote:
Originally Posted by jwilbur View Post
So let me ask one more time before just giving it a try. For those who installed AFT NACA scoops to feed an overhead console in an RV10, has anyone tried putting an OAT probe in a rear NACA scoop?
Decided to go straight to the source and ask the garmin guys. Answer I got was ANYWHERE on the fuse is a bad idea.
Looks like I have one PITA project to move mine before it flies to paint. Have some interior disassembling to do....🙁
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RV-10 N265WD
"Miss Whiskey Delta"
BPE IO-540, FULL EFII
KMYF, San Diego, Ca.
KEOS, Neosho, MO

Crew Lead on the
Grove Aero Super Legacy Reno Racer,
twin turbo, IO-540,
full EFII management system
!

"so I got that going for me... which is nice."
2017 Dues Paid"
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  #20  
Old 04-15-2016, 06:50 PM
WrightsRV7 WrightsRV7 is offline
 
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Default back of the bus...

For what it is worth, on my RV7, I ran mine (Dynon set-up) back with the wires going to the tail and mounted in on the rear inspection panel under the HS. Seemed to give good numbers and not affected by exhaust (i.e. never saw change with power setting changes, attitude, etc..). Very small gage wire so weight etc is no factor. Always seemed to provide accurate true airspeeds as well, to me a very nice benefit of having an OAT hooked to a glass cockpit. Not sure if I could "spin the dial" and get a true airspeed anymore, clearly spoiled by Dynon. Plan on the same location for the 10 I'm building.
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