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In process of rebuilding doors. i have installed new plexiglass sliders that work well thanks to all of the posts on this discussion group. Any thoughts re some sound proofing in the door panels. Originally doors had a piece of "tar paper" about 3" X 12" glued to inside of door. Is there a lite weight material that I could use that would lower the decibels and/ or keep the doors from vibrating? I flew this plane in the early '50s .......no fancy headsets or intercoms. We just yelled at each other to be heard. Is my idea of some soundproofing just an exercise in futility?
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Re: Re Build of N94978 BC12-d
The deadening from the "tar paper" is from the mass. It makes the sheet metal heavier so it doesn't vibrate synchronized with other things like the engine. It is like a big drum head and the "Tar paper" is like laying a book on top of the drum. Lighter things will not change the natural frequency of the sheet metal. You might be bale to drive the frequency higher than the engine by putting a cord from the skin to something in the door to dampen the vibrations. It would be fun to experiment with.
Hank -
Re: Re Build of N94978 BC12-d
Lee,
Before I put my new door panels on I cut to fit and adhered roofing paper, basically similar stuff just not as thick as original. You could also do the same to the inside of the boot cowl area, mine also had the heavy paper there. It is a loud airplane, anr headsets are wonderful.Cheers,
Marty
TF #596
1946 BC-12D N95258
Former owner of:
1946 BC-12D/N95275
1943 L-2B/N3113SComment
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Re: Re Build of N94978 BC12-d
I used about 1/2" thick fiberglass insulation in my doors, but I fly in the winter. TimN29787
'41 BC12-65Comment
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Re: Re Build of N94978 BC12-d
Now I'm looking for two wing nav lites for '46 12D. Anyone have a couple for sale?Comment
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Re: Re Build of N94978 BC12-d
It would be helpful if you could let people know what style of light you are looking for. Maybe you could find a picture of the style to post.
edited to add pictures. I know the cast lights were used pre war, but I'm not sure about post war. The other were used later, but I'm not sure when they started using them.Attached FilesLast edited by 3Dreaming; 10-25-2015, 08:48.Comment
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Re: Re Build of N94978 BC12-d
I have a full set (wing and rudder) of lights I just removed when I converted to L.E.D. NAV/ACL's. PM me if you're interested?
Originally posted by Leenicklas View PostGreg House
Brookshire, TX
TF #1089
BC12-D
N96043Comment
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Re: Re Build of N94978 BC12-d
Trying to contact you. Please call me at 918-853-3013Comment
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Re: Re Build of N94978 BC12-d
Still rebuilding N94978; Getting ready to cover fuselage. Do I put headliner (bot from Univaire or A/C spruce sometime ago) before any covering? H/liner has zippers in it; is it like pulling teeth to get aileron cables after headliner is in. Any comments will be appreciagted. LeeComment
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Re: Re Build of N94978 BC12-d
You have to do both first. ;-)
If you put the headliner in first the job is easy, but when you put the fabric on you will probably get dope on the headliner and REALLY screw it up.
If you cover first then put the headliner in you will need to hire a couple of contortionists and at least one "little person" unless you want to spend some SERIOUS time with the chiropractor afterwards.
I have done it both ways and on the 45 I intend to put the headliner in first, but NOT permanently. I will use hooks, VELCRO and lacing to put it in and get it perfect, then remove it and cover the plane. I plan to take it in and out several times while working on the plane to make sure any zippers are in the right place and everything can be reached while I can still reach everything from outside if needed.
If you do this make SURE you always take the headliner in and out using ONLY holes that will be available after covering! I am hoping to make it easy enough to pull the headliner for annuals and maintenance. Being able to un-snap or pop the VELCRO off and lift the back of the headliner out of the way to work on the aileron cables or trim system would be SUCH a blessing! I REALLY don't want to open up that cover hole in the roof to reach the trim handle, indicator and pulley up front.
HankComment
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Re: Re Build of N94978 BC12-d
Thanks, Hank; Very helpful info. LeeComment
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Re: Re Build of N94978 BC12-d
You need to cover first, then install your headliner unless you are using the same fabric to make a headliner as you are to cover the aircraft in which case you need to do the headliner first.Kevin Mays
West Liberty,KyComment
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Re: Re Build of N94978 BC12-d
I will echo that. There are places the headliner will need to be glued down where aircraft fabric goes. It would not be structurally sound to glue the aircraft fabric to the headliner.Originally posted by crispy critter View PostComment
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Re: Re Build of N94978 BC12-d
Headliner???
I'm so far behind, I think I'm aheadComment
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Re: Re Build of N94978 BC12-d
Now one more thing (like there is only ONE more thing). Any suggestions for an ELT. Need to get that mounted before I close up fuselage.Comment
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