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All About Guns What's your weapon of choice, and why? Discuss the beloved speargun here! |
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07-25-2020, 07:32 PM | #151 |
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Re: The Infinite Engines Dreamair moves from dream to reality
New single barrel alloy gun in a carbon fiber hull.
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07-25-2020, 10:01 PM | #152 |
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Re: The Infinite Engines Dreamair moves from dream to reality
I was wondering the same thing. Could it be because the compression ratio is so much higher to the point where the CVT can’t invert the loading force?
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07-26-2020, 12:44 AM | #153 | |
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Re: The Infinite Engines Dreamair moves from dream to reality
Quote:
When you have two extra side chambers you can use a much longer piston travel in the central tube and still keep the compression ratio not too high and we now know that it is around 1.5. That means the inner drum must have a longer spiral track and will be larger in its range of diameters as the width of the winding drums is the same if the guns all use the same size piston. With the oval tank gun the inner drum may have been wider which affects how much track you can incorporate onto it. The larger the range of diameters on the individual drums then the more variation you can have in the gearing and if you have a longer piston stroke then the diameter change needs to be greater on the inner drum being used to create the longer stroke. For example if you wind a cable on a tapered rod then you will not get as much length as if you wind it on a wooden spinning top because the surface area of the top is much greater and the range of diameters is greater over its surface. This is just my guess, but the longer the piston travel then you have more options with the gearing in terms of the maximum ratio of the drum radii going from outer to inner and vice versa. Bear in mind that the winding drums photos are from that oval tank gun, they may now be different in their tapered profile and sizes. Last edited by popgun pete; 07-26-2020 at 01:07 AM. |
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07-26-2020, 05:28 PM | #154 |
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Re: The Infinite Engines Dreamair moves from dream to reality
Another view of the gun and the hand pump for pressurizing it at the start of the season.
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07-26-2020, 10:05 PM | #155 |
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The Infinite Engines Dreamair moves from dream to reality
Just a thought but the “inverted loading” could also me missing if Andreas wanted to save that feature for the other more expensive guns. So, a way of differentiating the guns more.
Let’s say the reason for the different loading force diagram is down to using a non-tapered drum on the inside. I wouldn’t think the cost savings of that change would be much in terms of manufacturing. But a lot of companies go to great lengths to protect their high end product by removing features at the lower end that actually don’t cost that much to put in. (As often is the case with my posts on the subject of this gun, it’s purely speculation). Sent from my iPhone using Tapatalk |
07-27-2020, 12:38 AM | #156 |
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Re: The Infinite Engines Dreamair moves from dream to reality
I am more curious about how the carbon fiber gun goes together, especially inserting and removing the piston. In the original gun the layout was much like a standard pneumatic, you had a muzzle which carries the winding drums, a length of barrel extrusion and a rear handle and shock absorber unit that bolted on the rear of the tank which was the barrel. I don’t see any joins in the “Carbon Unreal” gun, although there must be some to allow it to be assembled and to allow periodic changing of the inner cable. The axle and drums can be removed as before by the threaded bearing mounts, but accessing the “inner works” is now not so obvious.
The attachment shows the original assembly. The other shows how the gun was serviced with its special spanner. |
07-27-2020, 01:29 AM | #157 |
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Re: The Infinite Engines Dreamair moves from dream to reality
Inner cable sweeps the interior as the inner drum winds in the piston, as shown in the sketch. The bore size of the barrel determines whether it has a free path without touching anything as it traverses the surface of the drum. The gun will be longer than the sketch image shows, but gives a general idea of how it needs to work.
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08-01-2020, 05:29 PM | #158 |
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Re: The Infinite Engines Dreamair moves from dream to reality
Another video. In this video we see the gun floating after the shot, tail down due to the reel. All carbon version of the "Dreamair".
https://youtu.be/bSAp5SMwers Moment of hit. |
08-01-2020, 05:49 PM | #159 |
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Re: The Infinite Engines Dreamair moves from dream to reality
In this next video the alloy internal barrel gun is shown in action, note the changing graph displayed on the left hand side of the screen as shots are taken at different ranges
https://youtu.be/E9-hmkNtW6Y |
08-02-2020, 02:56 AM | #160 | |
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Re: The Infinite Engines Dreamair moves from dream to reality
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The downside, if say you are comparing it to a two band gun, is that in effect you load both bands at once, there is no splitting of the loading effort. That is why for higher pressure you need the Dreamloader, which stages your effort rather than splits it. Compressed air is a lot more efficient at energy storage than rubber bands, but losses in the drum and sliding piston system are unknown, although they should be low with some energy being required to spin the drums and axle. |
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09-23-2020, 03:33 PM | #161 |
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Re: The Infinite Engines Dreamair moves from dream to reality
Bagging a Dentex.
https://youtu.be/6yVay3UJhRU |
09-24-2020, 12:16 AM | #162 |
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Re: The Infinite Engines Dreamair moves from dream to reality
Nice fish. The previous video he put out had some recoil, too leading me to conclude/speculate that the gun has really been powered up recently. I pointed it out to Andrea who seemed almost offended that I would use the word recoil with his gun;-).
I found it funny but it’s almost a non-issue as all guns have it and if people come from classic guns to this gun they will likely feel as if there’s “no” recoil;-) Sent from my iPhone using Tapatalk |
09-24-2020, 01:37 AM | #163 |
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Re: The Infinite Engines Dreamair moves from dream to reality
Yes, it has to have some recoil, however the gun seemed to drill that Dentex pretty well as the shot window was not that long, but when the fish turned broadside it was a goner. The only things flying forwards are the spear and the drive cable wishbone, while inside the gun the piston is flying back towards the rear handle. I doubt the piston is as heavy as the spear and is moving much slower because the spear is benefiting from being pulled by a large diameter pulley being spun at the axle by the piston pulling on a small diameter pulley. Tangential velocities are different even though rotational velocity is the same at any instant.
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12-23-2020, 03:07 PM | #164 |
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Re: The Infinite Engines Dreamair moves from dream to reality
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.
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12-26-2020, 06:22 PM | #165 |
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Re: The Infinite Engines Dreamair moves from dream to reality
The first guns with an aluminium tube inside the carbon fibre bodies have been delivered. Cost is 800 euro each for the first batch which includes hand pump and “Dreamloader”.
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