STATINTL

Approved For 2003/02/27 

5 February l974

The David Clark Company

P. 0. Box l5

Greendale Station 
Worcester, Massachusetts 01606

 

Attention:

 

 

 

Subject Shark Screen
Gentlemen:

Tests have been completed using the prototype shark screen re-
ceived from you. The following information and recommendation
are results of the test:

1. The tests were conducted using the USAF LPU life
preserver. By using the life preserver, the dimensions can
be reduced considerably (see attached sketch).

2. Construction can be simplified by making a curved
seam at the bottom rather than fitting a circular piece of
material to make the bottom. The circular bottom deploys some-
what better than a semicircular seal but it's more complicated
to build and will not package as well.

3. The enclosed sketch shows what a ?Shark Screen" would

look like with minimum dimensions for the life preserver with
the following additional comments:

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Approved For Rele?s'e 2003/02/27 

Page Two

a. In order to reduce package size, recommend
that only one inflatable ring be used, the lowest
one. Instead of the upper two (2) rings, a single
thickness of the same material used on the bottom
part should be used with twelve (12) grommet holes
and a draw string. With the reduction in dimensions
indicated on the sketch, the volume of materials
needed should be reduced by one-third.

b. The material used for the entire bottom part
of the bag should be the aluminized mylar with black
polyester over the aluminized side, black side out,
shining side in. 

c. The inflatable ring should be made of mylar
coated with black polyester only. No aluminizing on
the material. The inflatable ring should be partially
sealed or tacked together periodically around the
circumference in order that the ring will hold a
circular shape when inflated.

i d. Use screw-type closing valve for inflatable
ng.

e. Make semicircular seal at the bottom of the
bag rather than fitting a circular bottom to the bag.

f. The dimensions indicated on the sketch will
reduce the amount of material in the "Shark Screen?
to two-thirds of what it was in the prototype.

9. Vacuum packing should be used to reduce final
package size to the minimum.

would appreciate you looking over the new sketch and than
giving us a price quote for sixty (60) each "Shark Screens".
Also please include size vacuum packed and weight. 

Verv trulv vours.

 

 

 

Enclosure
Sketch of shark screen

 

Approved For Release 2003/02/27 CIA-RDP75B00285R000100220001-6

5 February 1974
Approved For Rel?l?e 

=6 41" r:

 

 

(26" Diameter DeployedGrommet Holes
for Draw String 3?
3..
//2r I I 

 

 

 

u;


Inflatable Collar,
Outer Part Made
Using Mylar Coated
With Black Polyeste

 

 

 

46"

Aluminized Mylar A
Coated with Black
Polyester
14"

 

*Shown Laid Out Flat
Approved For Release 2003/02/27