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  #1  
Old 03-15-2019, 10:41 AM
Brantel's Avatar
Brantel Brantel is offline
 
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Location: Newport, TN
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Default Rear Avionics Shelves

I am working on fabricating the rear avionics shelves that I want to build into my tail cone while everything is wide open.

I want to do something similar to this:


Image from http://www.tcwtech.com

I plan to do a similar shelf on each side and have been using a cardboard template to layout my plan.



I do not like the idea of uncurling the J stiffener like TCWTech did so I rolling my own way of connecting the edge of the shelf to the J stiffener.



When the shelf is level in both directions it does not align with the J stiffener so this misalignment must be compensated for. Here is what I have above which is hard to see:



I don't like how little force it takes to start to move/rotate the J stiffener. I know that once it is all locked together it will tend to minimize what I am seeing now but I still don't like it.

That being said I am thinking of adding either one or two ribs under the shelf and connect them to the bottom skin J stringers.






Anyone see any issues or a better way to tackle this? One rib or two?

I will likely use low weight EarthX or similar batteries so the additional weight is less of a concern for me.

Sorry for the napkin CAD!
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  #2  
Old 03-15-2019, 12:31 PM
BobTurner BobTurner is offline
 
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Sooner or later youíll have to get back in the tailcone. Make sure itís not too hard.
A few weeks ago someone posted that they had a remote magnetometer in a similar location, and putting his steel towbar into the baggage area affected it.
Just things to think about.
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  #3  
Old 03-15-2019, 12:38 PM
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Quote:
Originally Posted by BobTurner View Post
Sooner or later you’ll have to get back in the tailcone. Make sure it’s not too hard.
A few weeks ago someone posted that they had a remote magnetometer in a similar location, and putting his steel towbar into the baggage area affected it.
Just things to think about.
After entering that position on the RV-7 many times I am familiar with this appropriate warning! It is not if, it is when! The goal is to make it fairly easy to go over these shelves if needed. They will also be removable for hard core work.

I learned a trick to crawling into tail cones that works great and minimizes the chance for damage. I use a leaf bag with just the right amount of foam packing peanuts to put down under the board I crawl on to distribute the weight. It works amazingly well!

Likely I will mount the magnetometer in the wingtip.
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RV-10, #41942, N?????, Working on Emp/Tail Cone
---------------------------------------------------------------------
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  #4  
Old 03-15-2019, 12:56 PM
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rleffler rleffler is offline
 
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I was going to chime in on the access issue. I only have a tray on one side of the battery. My adahrs are hanging on a tray at the bulkhead where your plywood stops. It's painful for a big guy like me to get around the batteries, let alone if there is anything else in the way.

Fortunately, I've only had to do that twice. Once when an original magnetometer died and the second time when I upgraded them to adahrs.
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  #5  
Old 03-15-2019, 02:26 PM
lr172 lr172 is offline
 
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Quote:
Originally Posted by rleffler View Post
I was going to chime in on the access issue. I only have a tray on one side of the battery. My adahrs are hanging on a tray at the bulkhead where your plywood stops. It's painful for a big guy like me to get around the batteries, let alone if there is anything else in the way.

Fortunately, I've only had to do that twice. Once when an original magnetometer died and the second time when I upgraded them to adahrs.
+1

Having just crawled back there to do my static ports, I would not want that in my way. It is very difficult for a big guy to get back there and I am dreading bucking the rivets for the last top skin. Think about how you would crawl over that. Especially if you have a magnetometer hanging from the top z brackets and a large hose and valve back there as well for the overhead. Gets crowded quickly.

I hung the ELT on the side skin z brackets.

Larry
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Old 03-15-2019, 03:05 PM
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Its all removable for those rare occasions.

I am willing to put up with that minor occasional inconvenience to have plenty of space to mount components.

All systems seem to be very modular these days and having options of where to mount stuff is what I am after.

My magnetometer will go on the wingtip. I don’t really understand the need for the vent valve since the eyeball vents can close. I don’t have a valve on my RV-7 vents, just the good eyeballs that seal off very well. What am I missing on that?
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Check out my RV-10 builder's BLOG
RV-10, #41942, N?????, Working on Emp/Tail Cone
---------------------------------------------------------------------
RV-7/TU, #72823, N159SB
Lyc. O-360 carbed, HARTZELL BA CS Prop, Dual P-MAGs, Dual Garmin G3X Touch
Track N159SB (KK4LIF)
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Last edited by Brantel : 03-15-2019 at 03:08 PM.
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  #7  
Old 03-15-2019, 06:00 PM
cderk cderk is offline
 
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why not just use the plans the Bob posted on the TCWTech website? Worked great for me. Easy to make.
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  #8  
Old 03-15-2019, 07:40 PM
BigD BigD is offline
 
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Here's what I did:





The ribs were made from an extra set of the ones under the battery.

==dave==
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  #9  
Old 03-15-2019, 07:49 PM
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Brantel Brantel is offline
 
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Quote:
Originally Posted by cderk View Post
why not just use the plans the Bob posted on the TCWTech website? Worked great for me. Easy to make.
I used some of his design. I did not want to cut and unroll the J stiffeners. I also did not like the amount of flex that I was seeing with light pressure.

I am almost done with the fab of the right side. The left will go faster. The napkin CAD design above seems to be working out fine. It is very stiff.
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Brantel (Brian Chesteen),
Check out my RV-10 builder's BLOG
RV-10, #41942, N?????, Working on Emp/Tail Cone
---------------------------------------------------------------------
RV-7/TU, #72823, N159SB
Lyc. O-360 carbed, HARTZELL BA CS Prop, Dual P-MAGs, Dual Garmin G3X Touch
Track N159SB (KK4LIF)
Like EAA Chapter 1494 on Facebook
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  #10  
Old 03-15-2019, 07:53 PM
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Brantel Brantel is offline
 
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Quote:
Originally Posted by BigD View Post
Here's what I did:





The ribs were made from an extra set of the ones under the battery.

==dave==
I liked your idea allot. I almost went that route with the ribs. Came close to contacting you to find out how you made em. I already had stuff to fab up my own so I just decided to make em.

I went ahead and also tied the sides into the sides of the fuse just to have complete continuity.

This looks like it will be strong enough to crawl on.
__________________
Brantel (Brian Chesteen),
Check out my RV-10 builder's BLOG
RV-10, #41942, N?????, Working on Emp/Tail Cone
---------------------------------------------------------------------
RV-7/TU, #72823, N159SB
Lyc. O-360 carbed, HARTZELL BA CS Prop, Dual P-MAGs, Dual Garmin G3X Touch
Track N159SB (KK4LIF)
Like EAA Chapter 1494 on Facebook
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