Trygons

[Old Man Dave]

Fondu, I think we're talking all sorts of guns here. No restrictions on ideas.

Two points about "expelled gas" guns either air, CO2 or blank cartridge. In Europe all of these are either banned or under restricted licence - probably. The law is rather vague but "firearms" are not available to Joe Public, even air guns and soft air guns etc are under threat, similarly blank firers and replicas. So maybe spearguns could be made/used but could be dodgy.

Foxfish has nearly finished a roller gun. He's just waiting for a few parts. This is the link for pictures. [ame="http://forums.deeperblue.net/showpost.php?p=596330&postcount=446"]DeeperBlue Forums - View Single Post - Guernsey 2006[/ame]

This is my sketch of how my over-barrel airgun would work. Left trigger mechanism white this time for clarity.

Thinking more about Sicky's point on hydrodynamics, my gun would have a much narrower tube/reservoir as its internal volume would be greater 'cause there's no barrel inside it to take up space. Probably 25mm or even 20mm would do. That's less than a band gun. In fact it would be like a thin band gun but with no bands. Sweet.

Tom, yes , good point on the line. Had thought of a friction clip but didn't show it. Think there's room for some inovation along this line. Glad you didn't rubbish it (others have). Variations on Avery sidecasts or fixed spool technology must be able to be adapted and offer an advantage over all the normal "stringing".

Think on people and offer your 2 pence worth. :martial :naughty rofl :rcard .

Dave .

PS Would be interested in an opinion from the Medfish mamba boys. Shane? Memo? Give then a poke someone - Ed? Also anyone who knows a man who knows a man involved in manufacturing air guns. Mr Cressi, are you out there?

 

[Magpie]

I can see no reason why that wouldn't work, not that I'm any sort of expert of course!

Good point about airweapons on the continent, I'd forgotten that. Would limit the market for a pre-compressed gun. I still think your design could be fairly easily adapted to allow the under reservoir to be compressed using a piston at the end or if, either straight pull or a levered arrangement like pump-up pneumatic air rifles, would make the thing much safer and easier to load than using the spear.

With regard to the reel maybe something to consider is a design like a closed face fixed spool as is used for fine lines for river trotting to avoid the line getting blown off the spool. The closed face would prevent the line getting dragged off it by the water. Something like:

I've got a reel exactly like that you could maybe have a play with, not sure it would take the required line thickness though.

I agree that something along the fixed spool design would work though, a spear would have plenty of mass to overcome any slight resistance it created, and I've always disliked the fact that the spear has to pull line out of clips or off clips, this tug must affect accuracy. You'd have to use braided line though, I think thick mono would be too stiff to sit on such a tight spool diameter.

 

[sickbugs]

problem with closed face reels, as i can remember, is line tangling inside the reel.. why not a modified spincast reel design. it would also have the nice benifit of being a level winder instead of a bail, which is pretty bulky, what about using a ring (like a rod guide) hmn.. time for paint again, i realise that something like this could be very tricky to make, but, it would have a very easy to use (with no chance of slipping) drag, would levelwind itself, easy to reel.. on the outside of the reel, i'd have a big disc with a pin type thing for reeling on it, kind of like a flyfishing reel or spearfishing reel

 

[spaghetti]

I'm not sure I understand OMD's idea (not because he's not clear, but because my technical english is primitive), but a "barrell inside reservoir" airgun has already been designed in the 80's: it's the legendary Mares Mirage. Now discontinued, it was unsuccessfull on the market, but has a great reputation as one the best airguns ever designed, and for the few users it's still a cult, with frequent demand in used-gear-for-sale sites (guys pay up to 200 euro for vintage Mirage).
It was very similar to the Sten series, but with something really different inside. It had a leverage behind the handle: by pulling it, you could temporarily store the compressed air in a wider reservoir, in order to reduce the loading effort. Once loaded the shaft, you just had to pull back the lever, and it worked as a normal pneumatic, but much more powerful (it had a power reductor switch with 3 positions)...
Dont' know if this concept is what OMD is designing, but if so, it's a great idea, which in my opinion may still have great commercial opportunities.

 

[foxfish]

This was a great thread & although there are some pics missing now it is still interesting reading for anyone who missed it.
Anyone got any up to date info on the Trygons?

 

[panosb]

Today there is a TRYGONS frenzy here in Greece. The guns have earned the respect of the majority of spearos. The company has issued a new more affordable plastic series DMF.

Panos

 

[foxfish]

Thanks Panos, keep us informed if you get anymore info.

 

[foxfish]

www.trygons.com.
It would be crazy if you did not buy one!?

 

[foxfish]

Does any one know what has happened to their site?

 

[foxfish]

OK found new address simitis website but it doesn't seem half as good as the old one?

 

[Spaniard]

Hi Mate, ask on the Medfish forum as I'm sure someone there knows them?

 

[foxfish]

That is where I got the new address from!

 

[Vov]

I've just seen Trygons page and they sound very impressive! To be able to have enough mass during hunt so that a 3 x 16 mm bands on a 7,2 mm shaft recoil would not affect aiming and then be able to simply let the water out seems fascinating.... Provided that they have done the right ballance i. e. they have the sealed emty central portion of the body, big enough to provide neutral boyoncy wjth the shaft, regardless of depth, and 2 'floodable' sections infront and rear, a closed track rail, a monococque designincluding a 50-60 m reel, rear trigger... At this point I would not dream of rollers... If all this could be done at an affordable and resonable price I would call this THE innovative project!

 

[ulysses]

Thanks for the explanation on how a air riffle works!
I was not suggesting to use a self contained power source, I dont think you can use any spear gun in a competition that has not been self powered.
I was suggesting a gun like the mamba but with a small diameter barrel mounted above the compressed air & piston chamber.

There was a gun in one of the James Bond films that used a aqualung to power a spear gun.

If I remember correctly James Bond used a Pelletier CO2 airgun. There was a feature some years ago in the French Apnea magazine on Pelletier. Apparently he went out of business when this type of gun become illegal in France and pretty much ROW. There is also a dvd and some youtube footage on M.A. Berry using a Pelletier when spearfishing off the oilrigs in Gabon.

Cheers