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Old 01-30-2013, 02:07 PM   #61
Old_Lion
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Quote:
Originally Posted by chipgibbs View Post
How come a modern day air rifle can't get 40 shots on an 800psi fill? And why can't a modern day air rifle shoot 20 shots in 32 seconds? And it doesn't even make a report or make smoke?
I have many air rifles and none of mine can do any of this.....

I hate to say but, I'm pretty sure somebody's got their facts mixed up
Additional LINK
By Robert D. Beeman Ph.D

See section entitled:
Evidence Area 2: Number of Shots Per Air Charge

Quote:
"And Lewis simply told McKenzie a basic fact about the gun - it can fire about 40 times - meaning 40 times on a single air charge. The shots beyond 20 would not be world beaters, but just firing them would have been impressive. Also, forty is exactly two speedloader loads, representing a quick and easy way to load the magazine. Lewis may have let someone, maybe just another expedition member, see him load the balls into the gun - he may well have fired a magazine load, and then a quick speedloader refill - to come to that amazing total. Original instructions to Austrian soldiers advised them to only fire one loader tube of 20 balls before switching to another fully charged air reservoir."

===========
The butt stock was the air reservoir which is bigger than a CO2 powerlet.


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Old 01-31-2013, 04:30 AM   #62
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Gerandoni

Don't forget, It's a 42 caliber air rifle & the fill pressure is only 800 psi. What possible velocity or FPS could it have? My Daystates fill to 3200 psi. In 22 cal. the velocity is close to 850fps.
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Old 01-31-2013, 06:41 AM   #63
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QUOTES FROM THE BEEMAN LINK above

Quote:
"
Because of the sophisticated nature of the flat mainspring and the timed release mechanism, Baker and Currie (2002) suggest that the Girandoni system is capable of much greater power than air rifles of less advanced design (such as the Lukens air rifles).



As of May 2003 they were only willing to indicate that this system could project a lead ball, of about one-half inch diameter, of about 210 grains to a muzzle velocity of at least 500 fps for about 117 ft. lbs. of muzzle energy.



Colin Currie reported (personal communication May 18, 2003) that the Royal Armories of Leeds, England recently charged the Heiberger .433 caliber air rifle, a formerly single shot air rifle made about 1750 but converted to a 23 shot Girandoni-style repeating system, apparently in the early to mid-1800s, to about 800 lbs/sq. inch and achieved a muzzle velocity of over 900 fps with balls of 120.4 grains for a muzzle energy of 217 ft. lbs.



He reported that 1500 strokes were needed to pump up the Heiberger‘s buttstock reservoir to operating pressure after 20 shots had been fired from one charging/loading."


"

Larry Hannusch (personal communication, Nov. 27, 2002) reported that he has fired his own large bore Girandoni-system rifle (a Lowentz) producing 200 ft lbs. muzzle energy at 750 psi pressure, but that a muzzle energy of up to 150 ft. lbs. would be more typical at conservative pressures. All references to the Girandoni air rifles mention lethal combat ranges of 125 to 150 yards and some extend that range considerably. Currie and Baker also suggest that the Girandoni system could operate well at pressures well above 1000 psi, perhaps to double of that, and that they feel that the working pressure as supplied by special pumps, and thus the potential power, of the original guns was far higher than the figures normally quoted. Keller and Cowan (personal communications 9 November 2004 and 14 February 2005) think that the original air reservoir pressures topped at about 800 psi. The potential muzzle energy might be more accurately determined from tests now underway with exact museum copies of these guns. Fred Baer (1973) suggested that the power could be in the .38 Special area of modern firearms, or even into the range of the .45 ACP cartridge, famous in pistols and submachine guns favored by police, gangsters, and the military for several wars of the 20th century."
"
Some interesting pictures in the Beeman document.

George


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Old_Lion screwed with this post 01-31-2013 at 06:46 AM
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Old 01-31-2013, 10:34 PM   #64
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Quote:
Originally Posted by Aurelius View Post


Fired this test group off hand at 15 meters:


Very nice looking gun, but it obviously needs to be sighted in better.
You didn't hit the dime a single time!

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BTW...nice grouping
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Old 02-01-2013, 05:29 AM   #65
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Quote:
Originally Posted by BerndM View Post
Very nice looking gun, but it obviously needs to be sighted in better.
You didn't hit the dime a single time!

Regards
Bernd
BTW...nice grouping
I thought Germans weren't supposed to have a sense of humor.
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Old 02-01-2013, 10:57 AM   #66
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Quote:
Originally Posted by Aurelius View Post
I thought Germans weren't supposed to have a sense of humor.
He may have attended college in the U.S?

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