PT20J Posted April 16, 2021 Report Share Posted April 16, 2021 Where have folks been mounting this? Skip Quote Link to comment Share on other sites More sharing options...
Ragsf15e Posted April 16, 2021 Report Share Posted April 16, 2021 Probably all over the place, but make sure you agree with your shop. My jpi probe is about a foot out the left wing, 6” behind the leading edge on the bottom. Seems like a good place, shaded, outside prop wash, not near exhaust. 2 Quote Link to comment Share on other sites More sharing options...
ZuluZulu Posted April 17, 2021 Report Share Posted April 17, 2021 4 hours ago, Ragsf15e said: Probably all over the place, but make sure you agree with your shop. My jpi probe is about a foot out the left wing, 6” behind the leading edge on the bottom. Seems like a good place, shaded, outside prop wash, not near exhaust. That's where my new JPI OAT probe is too, except on the right wing. I'm not sure where the G5 OAT probe is but it reads 20 degrees hotter (!) so I am talking to my shop about relocating it. 1 Quote Link to comment Share on other sites More sharing options...
kpaul Posted April 17, 2021 Report Share Posted April 17, 2021 I have a JPI temp probe and one for my G5s. They are under the left and right wings, mounted into inspection panels. 1 Quote Link to comment Share on other sites More sharing options...
AerostarDriver Posted April 17, 2021 Report Share Posted April 17, 2021 I mounted my GAD 13 on the rack in the back and put the Davtron CP307S on the inspection panel shown with the red X. I have my GMU 11, Gad 29B and GAD13 all mounted in the tail so putting it their made the most sense. Also the location is in lighting zone 2A per the STC. Quote Link to comment Share on other sites More sharing options...
carusoam Posted April 17, 2021 Report Share Posted April 17, 2021 Mooney standardized a location for OAT... under the wing, in an inspection panel as described above... A bit extra work to run the wire that far out... The two key benefits are.... No extra heat from the cowl area shows up... No extra heat from the sun shows up... The most important part for accuracy... is when you are flying in icing conditions and you want to be out of them... every degree of accuracy counts... PP thoughts only, not a weatherman... Best regards, -a- Quote Link to comment Share on other sites More sharing options...
PT20J Posted April 17, 2021 Author Report Share Posted April 17, 2021 6 minutes ago, carusoam said: Mooney standardized a location for OAT... under the wing, in an inspection panel as described above... A bit extra work to run the wire that far out... The two key benefits are.... No extra heat from the cowl area shows up... No extra heat from the sun shows up... The most important part for accuracy... is when you are flying in icing conditions and you want to be out of them... every degree of accuracy counts... PP thoughts only, not a weatherman... Best regards, -a- Good point - I completely forgot there is a factory-mounted probe since I never look at the difficult-to-read analog gauge. I hate having unused stuff hanging around - I’ll see about mounting it where the factory probe is. Skip 1 Quote Link to comment Share on other sites More sharing options...
ArtVandelay Posted April 17, 2021 Report Share Posted April 17, 2021 I mounted my GAD 13 on the rack in the back and put the Davtron CP307S on the inspection panel shown with the red X. I have my GMU 11, Gad 29B and GAD13 all mounted in the tail so putting it their made the most sense. Also the location is in lighting zone 2A per the STC.I believe the factory temperature probes are on inspection plates #12, right side. 1 Quote Link to comment Share on other sites More sharing options...
aviatoreb Posted April 17, 2021 Report Share Posted April 17, 2021 A funny thing - I just had a pair of GI275's installed including an OAT probe. They chose a location and they chose on the belly toward the tail. Well now it reads correctly on the ground, but in flight it reads about 20C too hot! Its clear what is happening. The narrow stream of air from the exhaust stack must be rolling along the bottom of the plane right across the temp probe. Argh - oh well I am scheduled to return and have them relocate it. Quote Link to comment Share on other sites More sharing options...
Ragsf15e Posted April 17, 2021 Report Share Posted April 17, 2021 (edited) 14 hours ago, ZuluZulu said: That's where my new JPI OAT probe is too, except on the right wing. I'm not sure where the G5 OAT probe is but it reads 20 degrees hotter (!) so I am talking to my shop about relocating it. A few people have said their shop mounted the probe in the fresh air intake on the left or right cowl. It’s easy to wire there but not great for accuracy. You can just look in those and see it if it’s there. Edited April 17, 2021 by Ragsf15e Quote Link to comment Share on other sites More sharing options...
PT20J Posted April 17, 2021 Author Report Share Posted April 17, 2021 Avoiding the exhaust plume and engine heat seem to be prime considerations. I think mounting it in the location of the factory probe is best: Presumably Mooney gave some thought to this location and it avoids having the old probe left in the airplane. Skip 1 Quote Link to comment Share on other sites More sharing options...
Ragsf15e Posted April 17, 2021 Report Share Posted April 17, 2021 6 hours ago, PT20J said: Avoiding the exhaust plume and engine heat seem to be prime considerations. I think mounting it in the location of the factory probe is best: Presumably Mooney gave some thought to this location and it avoids having the old probe left in the airplane. Skip Definitely. While you’re doing this, the less probes, antenna, etc, the better. No need to make it look like a porcupine! Quote Link to comment Share on other sites More sharing options...
M016576 Posted April 18, 2021 Report Share Posted April 18, 2021 I’ve seen a temp probe mounted inside the cabin eyeball wemac vent scoop, just near the passengers/pilots knee before. When I saw that installation- I couldn’t help but think that it might read warmer than ambient. Interesting idea for mounting a temp probe though. (Definitely not a recommendation!) Quote Link to comment Share on other sites More sharing options...
ArtVandelay Posted April 18, 2021 Report Share Posted April 18, 2021 I’ve seen a temp probe mounted inside the cabin eyeball wemac vent scoop, just near the passengers/pilots knee before. When I saw that installation- I couldn’t help but think that it might read warmer than ambient. With JPI settings you can adjust the temperature settings to compensate for this. Quote Link to comment Share on other sites More sharing options...
59Moonster Posted April 23, 2021 Report Share Posted April 23, 2021 On 4/17/2021 at 9:45 AM, Ragsf15e said: A few people have said their shop mounted the probe in the fresh air intake on the left or right cowl. It’s easy to wire there but not great for accuracy. You can just look in those and see it if it’s there. My G5 probe is in the left cowl. Other than a little hot at ground/run ups. Can't say I've noticed anything off while in flight. Quote Link to comment Share on other sites More sharing options...
Ragsf15e Posted April 23, 2021 Report Share Posted April 23, 2021 8 minutes ago, 59Moonster said: My G5 probe is in the left cowl. Other than a little hot at ground/run ups. Can't say I've noticed anything off while in flight. Do you have another temp gauge to compare it to? Even a few degrees is going to make a difference depending on what you’re using it for. If it’s just there so you get a TAS readout on your G5 and you don’t use it to determine icing potential, it’s probably ok. 1 Quote Link to comment Share on other sites More sharing options...
Warren Posted April 30, 2021 Report Share Posted April 30, 2021 I mounted mine under the left wing, second access port on front edge. In flight it shows about 6C below the Aspen which is mounted on top of the cabin. It causes the Aspen and G5 to disagree on TAS by 5-10 knots depending on temperature difference which also affects the wind calculation. I assume this is due to sun heating the top sensor - now that I am writing this, I will check that theory in the hanger and the next time there is cloud cover or instrument conditions. 1 Quote Link to comment Share on other sites More sharing options...
PT20J Posted April 30, 2021 Author Report Share Posted April 30, 2021 There’s an old saying about how a man with a watch knows what time it is but a man with two watches is never sure. 2 1 Quote Link to comment Share on other sites More sharing options...
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