Double floor

bryanflood · #1 03-29-2007, 02:49 AM

Hi, I have an RV-9A and my wife constantly complains about the vibration of the floor, not really the noise, just the vibration. For some reason she seems really worried about it and has taken to removing her feet from the floor or putting large blankets under her feet. How horrible, I also notice the vibration but it's not particularly offensive to me or does it seems all that out of line for an aircraft w/o an interior. I think I would like to install a "double floor" with a 1/4" light ply. I know there are other RV'ers who have done this, an I would like feedback on there experience:

1. Did/does it reduce vibration...

2. How did you mount the floor?

I worried that an impropperly mounted floor will just transmit the vibration and not adress the problem.

Thanks,

Bryan

MrNomad · #2 03-29-2007, 03:14 AM

Please provide some more info.
How bad is it at 2300 rpm, 2400 rpm and higher?
What engine/prop combo do you have?
Did you balance after assembly?

smenkhare · #3 03-29-2007, 03:31 AM

How about just putting down a layer of foam like camping mats are made of?

jonbakerok · #4 03-29-2007, 05:49 AM

The vibration is caused from the exhaust pulses beating on the floorpan. You will be amazed at the difference if you fill the voids between the stiffeners with 3/4 foam and then lay carpet over that. I used a black vinyl nitrile foam that's fire proof and doesn't absorb liquids. I'd give you a part number but it doesn't seem to be in the Spruce catalog anymore.

az_gila · #5 03-29-2007, 10:13 AM

Quote:

Originally Posted by jonbakerok

The vibration is caused from the exhaust pulses beating on the floorpan. You will be amazed at the difference if you fill the voids between the stiffeners with 3/4 foam and then lay carpet over that. I used a black vinyl nitrile foam that's fire proof and doesn't absorb liquids. I'd give you a part number but it doesn't seem to be in the Spruce catalog anymore.

Jon .... I think you are talking about the black stuff on the top of this page...

http://www.aircraftspruce.com/menus/ap/soundproof.html

Just bought some for my Tiger... it's much denser than furniture foam, but not much heavier.

Note - the weight quoted is per linear ft. - it's 4 ft wide...

gil in Tucson

yakdriver · #6 03-29-2007, 11:03 AM

Get an Aero Classics carpet. Comes with the 3/4" dense foam bonded to the carpet. Also has heel pads under the rudder pedals and it fits perfectly. Don

gmcjetpilot · #7 03-29-2007, 06:45 PM

Get a new wife?

I'm KIDDING (Do what ever you can to please her, she is more important than the plane, yes I said it and mean it.)

Harvey L. Sorensen · #8 03-29-2007, 08:46 PM

I have no floor vibration on my 9-A. None. I put sections of 3/4" Super soundproofing betweenthe ribs in the floor and fitted 1/4" plywood over the soundproofing execpt for the center tunnel, I left that metal. I then painted the plywood with wingwalk paint for traction so I can back out of the plane. Works great. I also cut some groves in the soundproofing to run wires from front to back they are now under the plywood I hope I never need to get at them. But the plywood is not hard to remove but it is hard for me to get at.
I also put 3/4" soundproofing on the back side of the firewall.
Would or will do the same again.

walter · #9 03-29-2007, 09:24 PM

Ditto on the Aero Classics carpeting with integrated foam backer.
Knocked down most of the vibrations. Since I installed it, my feet are
comfortable as ever. Plus, it looks great and does have some sound
absorbtion properties, which I slightly noticed.

jonbakerok · #10 03-30-2007, 05:55 AM

Quote:

Originally Posted by az_gila

Jon .... I think you are talking about the black stuff on the top of this page...

http://www.aircraftspruce.com/menus/ap/soundproof.html

Just bought some for my Tiger... it's much denser than furniture foam, but not much heavier.

Note - the weight quoted is per linear ft. - it's 4 ft wide...

gil in Tucson

That's the stuff!