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  #1  
Old 06-23-2020, 10:22 PM
N546RV's Avatar
N546RV N546RV is offline
 
Join Date: Aug 2010
Location: Brookshire, TX
Posts: 1,160
Default Sometimes, you just have to sit back and enjoy the hilarity...

So for several work sessions, over the past couple weeks, I've been agonizing over my pitot tube position. Inboard of the bellcrank? Just outboard? Further outboard? Out at the wingtip?

I spent literal hours clamping the mast here and there, envisioning line routing, thinking of what I'd need to fabricate to secure things, considering what it'd be like to have to remove the pitot down the road for maintenance, etc etc etc. I even went so far as to test how the hard lines heated up to get an idea of how much I might be able to trim them.

After all of this, I finally settled. It was going to go one bay out from the bellcrank, against the outboard rib. So tonight was the night to make the cut and commit. Despite my agonizing, I was comfortable with my choice and didn't second-guess myself at all. It didn't even feel that odd making a hole in the skin.

Maybe it should have felt odd, because I put the hole in the wrong *** place, one bay outboard from my intended location.

I'm not even upset about it, just thoroughly amused at the irony of it all. This location is perfectly workable, I'll just need to lengthen the wiring harness between the tube and heat controller a bit.

Maybe that's the funniest part, how completely at peace I am with it not being in my carefully-chosen location. Almost amusingly anticlimactic.

Just gotta build on...

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-8 fuselage in progress (remember when I thought the wing kit had a lot of parts? HAHAHAHAHA)
http://rv.squawk1200.net
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  #2  
Old 06-23-2020, 10:38 PM
Taltruda Taltruda is offline
 
Join Date: Oct 2017
Location: Las Vegas, NV
Posts: 913
Default

Haha that?s a great story! I do the same things.. overthinking sometimes but feel better when I actually just do it! Question, do you need any access to behind the pitot tube ever? Maybe a good idea at fabricate a doubler and access panel? I see the benefits of it being on the factory panel that accesses the bell crank, but I also see the desire to pick an empty bay.
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  #3  
Old 06-23-2020, 10:45 PM
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N546RV N546RV is offline
 
Join Date: Aug 2010
Location: Brookshire, TX
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Default

Quote:
Originally Posted by Taltruda View Post
Haha that?s a great story! I do the same things.. overthinking sometimes but feel better when I actually just do it! Question, do you need any access to behind the pitot tube ever? Maybe a good idea at fabricate a doubler and access panel? I see the benefits of it being on the factory panel that accesses the bell crank, but I also see the desire to pick an empty bay.
Access shouldn't be necessary. I'm going to trim the hard lines from the pitot down to about 6" or so, and have service loops in the wing bay for both the pitot/AOA lines and the wires from the heat controller. If I need to service the tube, I can just pull the tube out and detach the lines and wires outside the wing.
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-8 fuselage in progress (remember when I thought the wing kit had a lot of parts? HAHAHAHAHA)
http://rv.squawk1200.net
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  #4  
Old 06-24-2020, 01:21 PM
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airguy airguy is offline
 
Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,589
Default

Quote:
Originally Posted by N546RV View Post
Access shouldn't be necessary. I'm going to trim the hard lines from the pitot down to about 6" or so, and have service loops in the wing bay for both the pitot/AOA lines and the wires from the heat controller. If I need to service the tube, I can just pull the tube out and detach the lines and wires outside the wing.
Do yourself a favor now and put a piece of masking tape on each plastic tube on the aircraft side AND the pitot side of the connection, and label it for static/AOA. Or at least clearly delineate in some manner that THIS tube belongs on that THAT side, so you can reconnect them correctly. Your memory will not be sufficient years later....

I had to go retrace my lines once to remind myself that I should have done it while building.
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Garden City, TX VAF 2021 dues paid
N16GN flying 900 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, IFD440, G5
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
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  #5  
Old 06-24-2020, 01:39 PM
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rv8ch rv8ch is offline
 
Join Date: Feb 2005
Location: LSGY
Posts: 4,298
Default Colored tubing

Quote:
Originally Posted by airguy View Post
Do yourself a favor now and put a piece of masking tape on each plastic tube on the aircraft side AND the pitot side of the connection, and label it for static/AOA. Or at least clearly delineate in some manner that THIS tube belongs on that THAT side, so you can reconnect them correctly. Your memory will not be sufficient years later....
Or buy some nicely colored tube from Stein.

https://www.steinair.com/product-category/pitot-static/

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  #6  
Old 06-24-2020, 02:38 PM
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1001001 1001001 is offline
 
Join Date: Dec 2014
Location: Just Minutes from KBVI!
Posts: 1,138
Default

Quote:
Originally Posted by N546RV View Post
So for several work sessions, over the past couple weeks, I've been agonizing over my pitot tube position. Inboard of the bellcrank? Just outboard? Further outboard? Out at the wingtip?

I spent literal hours clamping the mast here and there, envisioning line routing, thinking of what I'd need to fabricate to secure things, considering what it'd be like to have to remove the pitot down the road for maintenance, etc etc etc. I even went so far as to test how the hard lines heated up to get an idea of how much I might be able to trim them.

After all of this, I finally settled. It was going to go one bay out from the bellcrank, against the outboard rib. So tonight was the night to make the cut and commit. Despite my agonizing, I was comfortable with my choice and didn't second-guess myself at all. It didn't even feel that odd making a hole in the skin.

Maybe it should have felt odd, because I put the hole in the wrong *** place, one bay outboard from my intended location.

I'm not even upset about it, just thoroughly amused at the irony of it all. This location is perfectly workable, I'll just need to lengthen the wiring harness between the tube and heat controller a bit.

Maybe that's the funniest part, how completely at peace I am with it not being in my carefully-chosen location. Almost amusingly anticlimactic.

Just gotta build on...

You realize this means you're going to have to build another identical airplane with the mast in your intended location and perform a complete flight test regime to get experimental data confirming whether the location matters, right?
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  #7  
Old 06-24-2020, 02:43 PM
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N546RV N546RV is offline
 
Join Date: Aug 2010
Location: Brookshire, TX
Posts: 1,160
Default

Quote:
Originally Posted by rv8ch View Post
Or buy some nicely colored tube from Stein.
The SafeAir1 kit I have has color-coded lines already, so I'm there. I'm still going to label the tubing out at the wing end, because to Greg's point, when I pull this back out in however-many-years, I can already see myself thinking "wait, is blue pitot and green AOA or vice versa?"
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-8 fuselage in progress (remember when I thought the wing kit had a lot of parts? HAHAHAHAHA)
http://rv.squawk1200.net
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  #8  
Old 06-24-2020, 03:11 PM
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wcalvert wcalvert is offline
 
Join Date: Jan 2019
Location: Anacortes Wa
Posts: 331
Default Don't fight it

Your sub conscious mind wanted it there anyway... good choice!
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Anacortes, Wa

First Flight 7/17/2021!!
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  #9  
Old 06-24-2020, 06:56 PM
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Draker Draker is offline
 
Join Date: Jun 2016
Location: Livermore, CA
Posts: 566
Default

Congratulations! Your RV is already unique and you haven't gotten to the canopy yet!
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Livermore, CA
https://stiletto.smugmug.com/RV7
Donated 12/31/2020
RV-7A (N12VD): Finishing final tasks for engine-start and airworthiness!
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  #10  
Old 06-24-2020, 08:05 PM
Scott Hersha Scott Hersha is offline
 
Join Date: Jan 2005
Location: Cincinnati, OH
Posts: 2,012
Default

Phillip,
You will thank yourself later, AOA/pitot lines access not withstanding, for this outboard location. When you tie down your airplane, the pitot tube won?t be in the way. And - you won?t need to bring as much rope, because airport tie downs are for long winged Cessnas, not short winged RV?s, so you will always need to bring your own tie down ropes/straps. If your access to plumbing/wiring isn?t adequate, just add another inspection opening. Nobody will see it, unless they are buying it, and they will appreciate your thoughtful consideration of your design. I think you have found the perfect spot for your pitot tube.
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RV6/2001 built/sold 2005
RV8 Fastback/2008 built/sold 2015
RV4/bought 2016/sold/2017
RV8/2018 built/Sold(sadly)
RV4/bought 2019 Flying
RV6/Used kit purchased 2021 building
Cincinnati, OH/KHAO
JAN2021
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