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All About Guns What's your weapon of choice, and why? Discuss the beloved speargun here!

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Old 03-28-2020, 12:51 AM   #16
fredfoes
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Re: Made a 145cm inverter, 10mm shaft

that's it, i remember, :Yay::Yay::Yay:

we met 2 years ago in Bali at André's.

You had a Vela and you repaired a large hybrid roller

Wonderful work,
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Old 03-28-2020, 01:29 AM   #17
Satdiver
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Re: Made a 145cm inverter, 10mm shaft

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Originally Posted by SEATUX View Post
Beautiful Build!
Gotta ask..
WHAT ARE YOU HUNTING???
Thanks.

I like hunting Dogtooth tuna, Marlin and big Wahoo, I am planning a trip to hunt Bluefin when all this madness finishes in the world.
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Old 03-28-2020, 01:39 AM   #18
Satdiver
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Re: Made a 145cm inverter, 10mm shaft

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Originally Posted by popgun pete View Post
3.432 kg is good, you want mass if you are going to shoot heavy shafts which have good hitting power at long range. Seal's 130 (Kosta) weighs 2.5 kg with bands, my Urukay 120 cm weighs 2.57 kg bare.
Seals gun is very light weight. What size shaft did he use with this gun?
I suspect there would be some recoil.
How far forward from the trigger mechanism did Seal recommend to load the wishbone to?
I found with roller guns I needed to load about 180mm from the trigger mechanism to stop the shaft shooting low. But with inverter guns, load to the very rear shark fin.
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Old 03-28-2020, 01:52 AM   #19
Satdiver
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Re: Made a 145cm inverter, 10mm shaft

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Originally Posted by fredfoes View Post
that's it, i remember, :Yay::Yay::Yay:

we met 2 years ago in Bali at André's.

You had a Vela and you repaired a large hybrid roller

Wonderful work,
Yes I remember, I still have the Vela. The other gun you seen that I was building went into the BBQ wood pile with quite a few other failures.
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Old 03-28-2020, 01:59 AM   #20
popgun pete
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Re: Made a 145cm inverter, 10mm shaft

The Seal 130 cm inverted rollergun has an 8 mm shaft of 155 cm, but I don’t have it yet as the spear had to be shipped separately. It was one of three guns from his estate so to speak. Interestingly it is the exact same length from butt to muzzle as my Urukay 120 cm and the line releases line up when the guns are placed side by side.

Last edited by popgun pete; 03-28-2020 at 04:41 AM.
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Old 03-28-2020, 02:08 AM   #21
gspearguns
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Re: Made a 145cm inverter, 10mm shaft

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Had a go at building a of 145cm inverter. Overall length 165cm. 10mm Hunt double offset flopper shaft.
My mate wanted one so built 2 guns.
20mm bands through the back rollers and the rest 19mm bands.
Carbon strips between the laminate to stop the gun flexing.
Two 19mm x 6mm ceramic's bearings in each Delrin rollers.
Titanium stopper tube to reduce weight to help ballast the 1.1kg shaft and 1.6mm coated cable.
Ermes double roller trigger.
Very good work P. Some details looks familiar.
Have you tried smaller OD bands on higer streching factor?
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Old 03-28-2020, 02:37 AM   #22
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Re: Made a 145cm inverter, 10mm shaft

Doesn't the 10mm Shaft place a lot of Drag on the Fish? Tearing on the Wahoo Meats? It's fantastic that you are shooting a 10mm Shaft one handed with a 7# Gun.
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Old 03-28-2020, 05:09 AM   #23
Satdiver
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Re: Made a 145cm inverter, 10mm shaft

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Doesn't the 10mm Shaft place a lot of Drag on the Fish? Tearing on the Wahoo Meats? It's fantastic that you are shooting a 10mm Shaft one handed with a 7# Gun.
I try very hard to place a good shot with the 10mm shaft. These inverter gun's are very acccurate with very little recoil.
You can see the tearing on the fish on the right, after a bad shot. All these fish was shot with a 10mm slip-tip shaft.

I have used a 10mm double offset flopper shaft for big Wahoo with very good success.
I see my friend shoot & land a 55kg Wahoo with a 10mm double offset flopper shaft.
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Old 03-28-2020, 05:43 AM   #24
popgun pete
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Re: Made a 145cm inverter, 10mm shaft

What is your preferred shooting distance on the Wahoo?
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Old 03-28-2020, 06:34 AM   #25
Satdiver
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Re: Made a 145cm inverter, 10mm shaft

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What is your preferred shooting distance on the Wahoo?
I like to get as close as possible, the wahoo you see in the first lot photo's weighed 45kg, I end up shooting it in the tail as it was about 8 meters away and moving. I must say it put up quite a fight. I shot this fish with my Alemanni Vela. I believe this gun I built will have a longer range.
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Old 03-28-2020, 01:12 PM   #26
Satdiver
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Re: Made a 145cm inverter, 10mm shaft

I have uploaded a video of target & penetration testing on YouTube.

https://youtu.be/8dVYa4KqpGY
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Old 03-28-2020, 01:19 PM   #27
fredfoes
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Re: Made a 145cm inverter, 10mm shaft

very big penetration on styro
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Old 03-28-2020, 03:23 PM   #28
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Re: Made a 145cm inverter, 10mm shaft

Nice Tests. What are the Distances to the Accuracy and Penetration Targets?
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Old 03-28-2020, 03:55 PM   #29
Satdiver
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Re: Made a 145cm inverter, 10mm shaft

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Nice Tests. What are the Distances to the Accuracy and Penetration Targets?
Was only 5 meters. I only had two & half raps for this test, 8.4meters of shooting cable.
I have now set the gun up with three & half raps of shooting cable equals 11.2 meters, to test this gun out to 10 meters. Just need this corona virus to finish.
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Old 03-28-2020, 04:06 PM   #30
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Re: Made a 145cm inverter, 10mm shaft

It's too bad we can't figure out how to make Rollers/Inverters which are aligned side to side rather than top to bottom.. In that way they would truly cancel things out.

Pool tests are interesting, but I can't help but think your accuracy/recoil management would be better in real life. In Real life you would have your fins extended and engaged behind you, probably moving forward which adds a huge amount of stability and strength to your body alignment. Also, you could be using a second hand for bracing. What are your thoughts?
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