[Boatanchors] Speaker repair

[Dave Harmon]

Silkspan does not shrink unless it is applied wet over an open
structure...like wing ribs, then doped with nitrate...butyrate shrinks more.
Applied dry on a surface....silkspan does not shrink.

Dave Harmon
K6XYZ[at]sbcglobal[dot]net
Sperry, Ok.


-----Original Message-----
From: boatanchors-bounces at mailman.qth.net
[mailto:boatanchors-bounces at mailman.qth.net] On Behalf Of rbethman
Sent: Sunday, January 15, 2012 5:08 PM
To: boatanchors at mailman.qth.net
Subject: Re: [Boatanchors] Speaker repair

It still IS Silkspan.

It still shrinks when wetted.

It'll shrink with Nitrate Dope, sold by Sig.

Full scale use ceconite, and cement it down, where it joins.  They then use
a heat gun.

Piper J-3s, PT-17 Stearman, and a whole bunch of others.

Some of those are ALSO painted with Dope.

Bob - N0DGN

On 1/15/2012 5:57 PM, J. Forster wrote:
> Hmmm....  . As far as I can remember, I never wetted my wing coverings 
> before doping, and they did turn out nicely. Maybe it was some other 
> kind of paper waaaay back then?
>
> -John
>
> ============
>
>
>
>> Silkspan paper does not shrink unless it is wet with water and 
>> allowed to dry.
>> Applied dry to a speaker cone with nitrate dope prevents shrinkage.
>> Works great....as long as the speaker doesn't belong to me.
>>
>> Dave Harmon
>> K6XYZ[at]sbcglobal[dot]net
>> Sperry, Ok.
>>
>> -----Original Message-----
>> From: boatanchors-bounces at mailman.qth.net
>> [mailto:boatanchors-bounces at mailman.qth.net] On Behalf Of Glen Zook
>> Sent: Sunday, January 15, 2012 4:03 PM
>> To: jfor at quikus.com
>> Cc: boatanchors at mailman.qth.net
>> Subject: Re: [Boatanchors] Speaker repair
>>
>> Fact that the silkspan shrinks is the problem.  It works great for 
>> model airplanes (in my younger days I built quite a few), but the 
>> very fact that it does shrink when "dope" is applied could definitely 
>> cause physical distortion to the speaker cone.  Then, the physical 
>> distortion could cause distortion in the reproduced sound from the
speaker.
>>
>> Using a paper that doesn't shrink is, in my experience, a much better 
>> solution.
>>   
>> Glen, K9STH
>>
>>
>> Website:  http://k9sth.com
>>
>>
>> ________________________________
>>   From: J. Forster<jfor at quikus.com>
>> To: Glen Zook<gzook at yahoo.com>
>> Cc: "boatanchors at mailman.qth.net"<boatanchors at mailman.qth.net>
>> Sent: Sunday, January 15, 2012 2:59 PM
>> Subject: Re: [Boatanchors] Speaker repair
>>
>> Once doped, I doubt water would do much. Planes I built with it are 
>> intact after over 50 years.
>>
>> -John
>>
>> ===============
>>
>>> That paper was called "silkspan".  It worked better when it was 
>>> sprayed with water and then left to dry.  That pulled the covering 
>>> taught.  Then, "dope" was applied.
>>>
>>> I would be very hesitant to use this on a speaker because if the 
>>> humidity went up there might be a possibility of the paper shrinking 
>>> and distorting the speaker's cone.
>>>   
>>> Glen, K9STH
>>>
>>>
>>> Website:  http://k9sth.com
>>>
>>>
>>> ________________________________
>>>    From: J. Forster<jfor at quikus.com>
>>> To: mac<w7qho at aol.com>
>>> Cc: "boatanchors at mailman.qth.net"<boatanchors at mailman.qth.net>; Glen 
>>> Zook<gzook at yahoo.com>
>>> Sent: Sunday, January 15, 2012 2:31 PM
>>> Subject: Re: [Boatanchors] Speaker repair
>>>
>>> I think the paper is different.
>>>
>>> Years ago, there was a sort of open paper sold for covering model 
>>> planes, designed to be doped and shrink a bit. That might also work.
>>>
>>> -John
>>>
>>> ==============
>>>
>>>
>>>> And you have a choice of brown or white...  :^)
>>>>
>>>> On Jan 15, 2012, at 11:28 AM, Moe Fretz wrote:
>>>>
>>>>> Coffee maker filters also work well.
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-- 
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|               AM Amateur Radio Operator    NØDGN                 |
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| Bob Bethman                \\\|///     " The absence of a danger |
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