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Re: REFLECTOR: Door Trim
I'm using a special 1/4 round soft foam like that used on Pipers. I'm putting
it on the doors so it will seal against the frame. This seal is expensive,
about $1.75 per foot, however in tests with a small piece moved around the door
frame it will give a solid seal. One other benefit is that it compresses easily
so you don't warp the door with the high pressures you get with the factory
seal.
Jim
Joe Stack wrote:
> Builders...
>
> I've finally arrived to the point where I've almost got my doors fitting
> satisfactorily. However, from my experience with cars and spam cans I have
> grave misgivings about the quality of the seal. This is because it is
> always such a horrific source of cabin noise. Without resolving this,
> there's no point in trying to resolve any other cabin noise problems.
>
> I'll try to present the problem the way I see it and then I'll throw out the
> questions. I've scanned a sketch to which I'll refer in the hopes that it
> makes my description somewhat more understandable.
> Given:
> * we have a fuselage wall constructed with glass over 1/2" foam
> * we have a trim seal component with a 3/8" extruded bulb
> * we have a door lip which, when closed, barely makes contact
> with the working surface of the trim seal bulb (and doesn't
> contact at all in some ill-fitting spots) On some places
> between the door and the fuselage the door flange and the
> bulb are 1/8" away
> * we have an engineering specification from both Trim Seal and
> Thomas which says that for "optimum" seal performance the bulb
> must be compressed at least 25%
>
> The conflict comes because there is no way to compress the bulb in this
> configuration. As I see it, this leaves us with 2 options. Either 1),
> select a similar part with say a 3/4" bulb; or 2), put a fillet on the
> inside lip of the door to force the bulb to compress when the door's closed.
>
> Questions:
> * Are there holes in my understanding/analysis of the problem?
> * Does everybody have the same problem (I can't imagine not)?
> * Any other ideas about how do deal with it (other than live with it & buy
> a good headset)?
>
> Regards,
>
> Joe Stack
> N983SC - XL/RG
>
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> Name: DoorTrim.gif
> DoorTrim.gif Type: GIF Image (image/gif)
> Encoding: base64
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// James F. Agnew
// Tampa, FL
// Velocity 173 FG Elite ( http://www.VelocityAircraft.com/ ) under construction