I weighed some mostly blue microfilm at 29mg /100si a couple years ago. It
was poured from a batch of Violet Dream microfilm. I don't have my notes
handy, but silver film is a fair bit lighter than that.
On Jan 12, 2016 4:58 PM, "leop_at_lyradev.com [Indoor_Construction]" <
Indoor_Construction_at_yahoogroups.com> wrote:
>
>
> I have weighed samples of all the light films used for F1D class models.
> The list below gives two area densities for Y2K because I have found that
> there are generally two kinds of Y2K film based on when it was sold. I
> label the newer, heavier Y2K film as Y2K-4K (the markings on the inside
> sticker my rolls are dated 4/04 and I have seen rolls with later dates).
> My Y2K2 film is yellow (almost gold) in color with some blue. My older
> lighter Y2K film has a great deal of blue color and and some red, but
> little or no yellow. My newer Y2K is mostly green with some red. My
> current Os Film is mostly green with some bands of lighter red. John Kagan
> has said the that Y2K films are fragile compared to OS film. I have found
> that certainly true for Y2K2 and the older Y2K although the older Y2K is
> less fragile than Y2K2. My newer Y2K and OS films are much more robust and
> easier to handle. I think that my newer Y2K handles better and is a bit
> less fragile than my current roll of OS film. Here are my measured
> weights. Please remember that these thin Mylar (polyester) films are
> specially made so that the thickness varies not only between different
> large master rolls but also between individual retail rolls and even within
> a single retail roll itself.
>
> Y2K2: 540mg/sq. meter 35mg/100si
> Y2K: 660mg/sq.meter 42mg/100si
> Y2K-4K: 740mg/sq.meter 48mg/100si
> OS Film: 780mg/sq.meter 50mg/100si (can be heavier/lighter as this is
> just my current roll)
>
> Just to give an idea of how these films compare for an as built plane, we
> can consider a current 55cm F1D. The combined film area (including the
> prop) of such a plane is generally about 280 si or 0.181 sq.meter (or even
> less for the elliptical wing/stab, smaller prop designs). The weight
> difference between using Y2K2 and OS film (using the above area densities)
> is about 43mg. For an EZB with 75 si (0.05 sq.meter) of film area, the
> weight difference is 12mg. For the much larger F1 open and HLS planes, the
> weight difference can approach 100mg
>
> As an aside, I have never poured and made any microfilm covering so I have
> not been able to weigh any. From the interference patterns (plus the gold
> or silver color), the microfilm is often much thinner than even Y2K2 and
> should have even less area density. Maybe someone who used or uses
> microfilm can add some information about the area densities (which also
> vary depending on the original liquid and pouring technique).
>
> LeoP
>
>
>
Received on Tue Jan 12 2016 - 18:13:44 CET
This archive was generated by Yannick on Sat Dec 14 2019 - 19:13:48 CET