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Pelengas Pneumovacuum speargun

tromic

Well-Known Member
Aug 13, 2007
1,635
185
153
Croatia
New battery installed.
Titanium 8 mm slider: length 17.67 mm, OD 10 mm, ID 9.16 mm, rear step 9.60 mm, bore 8.10 mm

Titanium 7 mm slider: length 18.05 mm, OD 10 mm, ID 8.10 mm, rear step 10.30 mm, bore 7.10 mm
View attachment 55245
At 35 m/s speed of the shaft kinetic energies for slider collision to the step end:
- 7 mm; for slider 1.8 J, for water 3.11 J
- 8 mm: for slider 1.16 J, for water 2.23 J.
I would say this titanium hydro-damper sliders would work. The problem might be because the wall of the 8 mm slider is maybe too thin, 0.42 mm..and there is very small gap between the tail step and the slider wall, only 0,08 mm. Maybe the bore would be better to be 8.05 mm to reduce the tilt of the slider and the rear step could be shorter, maybe 7 mm? Very important is that the shaft tail cone must be in a very center of the shaft! The slider must not touching the shaft tail step end during moving along the shaft in any position (sideway).
 
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popgun pete

popgun pete

Well-Known Member
Jul 30, 2008
3,857
967
203
Australia
An “ICE” model of the Pelengas gun was released at the recent Moscow Dive Show. This gun has white parts for use at night which enable better visibility under gloomy conditions while preparing the gun for the next shot and for relocating it if you happen to drop it when loaded onto the bottom.
white pelengas ice model.jpg
 
OP
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popgun pete

popgun pete

Well-Known Member
Jul 30, 2008
3,857
967
203
Australia
Here is what happens when you take a reel frame before it is folded into a "U" shape to mount the spool and instead bolt it together with another similar frame to create a two spool reel. Certainly looks different!
double reel.jpg

reel mount.jpg
 
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popgun pete

popgun pete

Well-Known Member
Jul 30, 2008
3,857
967
203
Australia
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