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  #1  
Old 04-27-2021, 06:40 PM
bluebonnet bluebonnet is offline
 
Join Date: Apr 2021
Location: ASPERS PA
Posts: 1
Default Battery access door

I'm a new member building an RV8-A. I'll probably have a lot of questions.
Question- I have seen various mods to access the aft mounted battery through
the baggage area. Has anybody cut an access door in the aft side skin. What
are the pros and cons? Structural- etc. Thanks for any help and opinions,

Last edited by bluebonnet : 04-27-2021 at 06:46 PM.
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  #2  
Old 04-27-2021, 06:50 PM
Mike S's Avatar
Mike S Mike S is offline
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 16,052
Default Welcome to VAF

Quote:
Originally Posted by bluebonnet View Post
I'm a new member building an RV8-A. I'll probably have a lot of questions.
Fred, welcome aboard the good ship VAF.

Methinks you need to get the factory to answer the question about cutting a hole in the side skin.
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  #3  
Old 04-27-2021, 07:20 PM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is offline
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
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Default

I got this from someone else on VAF - happy I made it. I would never consider cutting a hole in the skin.

Carl


Last edited by Carl Froehlich : 04-27-2021 at 07:25 PM.
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  #4  
Old 04-27-2021, 07:24 PM
JDeanda JDeanda is offline
 
Join Date: Apr 2013
Location: Ventura, CA
Posts: 261
Default Battery Access

Holes are heavy.
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  #5  
Old 04-28-2021, 05:38 AM
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DanH DanH is offline
 
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Location: 08A
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Default

Do not cut a hole in the side skin.

It would be all but useless anyway. You will remove the baggage compartment shelf and rear bulkhead at least once a year for a decent inspection. A quick access panel in the baggage shelf works fine for minor stuff.
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  #6  
Old 04-28-2021, 08:00 AM
David Z David Z is offline
 
Join Date: Aug 2010
Location: Thunder Bay Ontario
Posts: 751
Default

Quote:
Originally Posted by JDeanda View Post
Holes are heavy.
Holes are light, there's nothing there. It's ensuring the hole retains the required structural strength that's heavy. Similar to how a fall never hurt anyone, the sudden stop at the end is what gets you.
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  #7  
Old 04-28-2021, 08:38 AM
JDeanda JDeanda is offline
 
Join Date: Apr 2013
Location: Ventura, CA
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Default Yup

Quote:
Originally Posted by David Z View Post
Holes are light, there's nothing there. It's ensuring the hole retains the required structural strength that's heavy. Similar to how a fall never hurt anyone, the sudden stop at the end is what gets you.
:-) Same argument, couched a bit differently. I’m a wannabe engineer, at least my business card at the last place I worked said I was an engineer. Not bad for a guy with an HSG degree. But the real engineers I worked with all said holes are heavy, shorthand for just what David said.... keeping structural integrity around said holes adds weight. For example, a hole in a semimonocoque fuselage, big enough to access a battery, is going to add significant weight if it’s reinforced enough to maintain the same strength and stiffness. The door and it’s attaching hardware will be heavier than just a simple sheet of .025, too. The wording “Holes are heavy” is very elegant, no?
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  #8  
Old 04-28-2021, 09:03 AM
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riseric riseric is offline
 
Join Date: Oct 2011
Location: Québec, CNV9
Posts: 456
Default How often ???

Not flying yet...
How often do you need to check the battery???
It's a dozen or so screws that hold the upper bagage floor and the rear bulkhead... 120 seconds to remove...

My 2 cents...
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  #9  
Old 04-28-2021, 10:24 AM
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skyking902001 skyking902001 is offline
 
Join Date: Oct 2009
Location: Gunter, TX
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Default Not worth the effort

Quote:
Originally Posted by riseric View Post
Not flying yet...
How often do you need to check the battery???
It's a dozen or so screws that hold the upper baggage floor and the rear bulkhead... 120 seconds to remove...
I added a hatch to the baggage floor and if building again, I would NOT spend the time and effort for this mod. For inspections and battery maintenance, I still have to remove the baggage floor. The hatch may be great to look in and see that everything is where is should be, but rather useless when it comes to maintenance issues. It took me about 15 hours to design and construct the hatch--wish I had skipped this mod.
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  #10  
Old 04-28-2021, 11:48 AM
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fl-mike fl-mike is offline
 
Join Date: Jul 2005
Posts: 1,585
Default

Quote:
Originally Posted by riseric View Post
Not flying yet...
How often do you need to check the battery???
It's a dozen or so screws that hold the upper bagage floor and the rear bulkhead... 120 seconds to remove...

My 2 cents...
ask someone maintaining an 8 about getting those screws out, and that big piece of bent aluminum around you and out while kneeling in the back cave. (without bending or scratching anything)

You'll put a quick access hatch in the second 8 you build....
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