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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 12-26-2020, 11:57 PM   #166
Diving Gecko
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The Infinite Engines Dreamair moves from dream to reality

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Originally Posted by popgun pete View Post
There is now a version of the "Dreamloader" which gives a 3:1 mechanical advantage by adding another set of pulleys on each side of the loader cables. The original "Dreamloader" with the pulleys in the wishbone hooks gives a 2:1 advantage. The loading handles need to pull three times the wishbone draw distance instead of twice the distance if you use the extra pulley sets.


I actually had the parts for a 3:1 version of my PulleyLoader for my airgun but turned out 2:1 was enough for my use. But 3:1 would possibly give me a bit more control of the shaft during loading so I may still make it some day to test that out.

Iíve said this a ton of times, I have so much respect for Andreasí tenacity and donít want to sound like a downer but I just have a bit of a hard time to see the positives in the DreamAir needing a loader and now, an even more powerful one at that. If I was really skeptical, Iíd have to say it could point to the gun not being as powerful as he expected. But at least, it should show that the internals are well designed and built if he can power it up the much and the parts can take the beating.
Also, I made one for my own airgun and while itís an extra bit of kit that takes time rigging and storing, itís not that big a deal on a big gun. Still a bit slower than a three banded classic gun but if you are already missing out on super fast reloading, I donít think it matters if youíre 30-60 secs slower.

I would really like to see a proper Majd-style pool test to see how the gun shoots with and without the loader.


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Old 02-01-2021, 04:43 PM   #167
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Re: The Infinite Engines Dreamair moves from dream to reality

Some recent photos showing gun accessories and the mounting position for a reel.



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Old 03-01-2021, 09:06 PM   #168
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Re: The Infinite Engines Dreamair moves from dream to reality

Pumping table for this 100 cm model. Note the long barrel tube on the hand pump.
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Old 03-01-2021, 09:20 PM   #169
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Re: The Infinite Engines Dreamair moves from dream to reality

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Originally Posted by Diving Gecko View Post
I actually had the parts for a 3:1 version of my PulleyLoader for my airgun but turned out 2:1 was enough for my use. But 3:1 would possibly give me a bit more control of the shaft during loading so I may still make it some day to test that out.

Iíve said this a ton of times, I have so much respect for Andreasí tenacity and donít want to sound like a downer but I just have a bit of a hard time to see the positives in the DreamAir needing a loader and now, an even more powerful one at that. If I was really skeptical, Iíd have to say it could point to the gun not being as powerful as he expected. But at least, it should show that the internals are well designed and built if he can power it up the much and the parts can take the beating.
Also, I made one for my own airgun and while itís an extra bit of kit that takes time rigging and storing, itís not that big a deal on a big gun. Still a bit slower than a three banded classic gun but if you are already missing out on super fast reloading, I donít think it matters if youíre 30-60 secs slower.

I would really like to see a proper Majd-style pool test to see how the gun shoots with and without the loader.


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Maybe Majd would like to buy one, the guns are not that expensive when compared to other all carbon fiber guns and he certainly has the means to test it and compare the results with those of other guns. I am more interested in the alloy bodied gun because that gun piqued my interest in the first place.
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Old 03-02-2021, 03:45 PM   #170
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Re: The Infinite Engines Dreamair moves from dream to reality

The basic advantage of this speargun design is that it combines the much more efficient energy storage of a pneumatic system with the ability to load the gun with both hands. On a normal pneumatic gun you need one hand to stabilize the muzzle while you pull on the loading handle and if needed can only employ the other hand once the spear is nearly fully inserted and the gun is no longer in danger of pivoting off your foot where the rear handle is pressing.

The big diameter piston of 500 mm squared cross-section means that internal start pressure can be relatively low while providing a high level of force for spear propulsion. As water never gets inside the gun the piston has pressure on one side and a near vacuum on the other in what is a sealed system, so it is completely unaffected by ambient pressure at depth.

Rather than the piston pushing the spear it pulls it via a cable drive using an axle in the muzzle. The only other pneumatic guns with rearward travelling pistons as they shoot are the hydropneumatic guns, but facing water braking inside the gun they require very high start pressures or multiple loading strokes to drive shooting pressure up. This makes for a lowered operating efficiency compared with standard pneumatic guns, while the Dreamair's high efficiency will only be offset by friction of the piston seals and the need to wrap and unwrap the cables and spin the pulley/drum axle. A big loading effort can be used as the spear is no longer transmitting the force to the piston during loading as like band guns loading and gun cocking are two separate tasks.

Pneumatic guns combine loading and cocking which is very efficient while the gun body and spear are short, but drops away if cocking requires several pushes to complete the charging of the gun for shooting when the gun is much longer.
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Old 03-02-2021, 06:08 PM   #171
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Re: The Infinite Engines Dreamair moves from dream to reality

To obtain a piston cross-sectional area of 500 square mm the diameter of the piston has to be slightly over 25 mm, therefore it is about double the size used in most pneumatic guns of a conventional layout. An even larger piston of double the area was used in the oval bore alloy guns which were essentially monotubes.
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Old 03-03-2021, 03:56 AM   #172
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Re: The Infinite Engines Dreamair moves from dream to reality

Thanks for the insight Pete. Truly an amazing piece of engineering. However it doesn't suit my style of fishing at all... Sometimes even double banded guns are overkill for me.

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Old 03-03-2021, 02:54 PM   #173
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Re: The Infinite Engines Dreamair moves from dream to reality

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Thanks for the insight Pete. Truly an amazing piece of engineering. However it doesn't suit my style of fishing at all... Sometimes even double banded guns are overkill for me.

Mikel
You just adjust the air pressure in the gun to make it as powerful as you need. Basically it is a single band gun, but changing the pressure is the equivalent of swapping that single band for a thicker one or a thinner one. If there is a downside that single band loading could be the equivalent of pulling four bands back as one unit with their wishbones all interlinked to form one loop, hence the need for the Dreamloader supplied with each gun.
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Old 03-03-2021, 03:55 PM   #174
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Re: The Infinite Engines Dreamair moves from dream to reality

This thing is amazing. The loading system takes me back a little...
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