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 Post subject: DIANA 24 .177
PostPosted: Sat May 30, 2015 6:00 am 
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Joined: Tue May 26, 2015 4:51 pm
Posts: 6
HELLO ALL, QUESTION
how many fps would one expect to get from full power(pal) D24`

thanks


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 Post subject: Re: DIANA 24 .177
PostPosted: Sat May 30, 2015 6:46 am 
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Joined: Tue Jan 29, 2013 6:54 pm
Posts: 2413
Location: Northeastern Ontario
marioc wrote:
HELLO ALL, QUESTION
how many fps would one expect to get from full power(pal) D24`

thanks

The Diana 24 .177 is similar to the Diana 240 and both are "smallish" rifles. The specs from the Diana website says the 240 in .177 will produce 580 fps. Of course, that figure would depend a great deal on the weight of the pellet used. Perhaps stronger springs can be used that might produce higher muzzle velocities, but that might well result in a less pleasant shooting gun.


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 Post subject: Re: DIANA 24 .177
PostPosted: Sat May 30, 2015 7:53 am 
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Joined: Mon Dec 24, 2012 2:51 am
Posts: 458
My 15 year old diana 24 with to4 trigger will shoot 620-625 fps with crosman 7.4gr pointed pellets. I believe there are a few different piston/trigger/spring combos on the 24's over the years so the fps may be different depending on what setup the gun has. I also think they are all around the 600 fps mark.

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SKANZY


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 Post subject: Re: DIANA 24 .177
PostPosted: Sat May 30, 2015 8:50 am 
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Joined: Sat May 07, 2011 12:09 pm
Posts: 1677
Location: Waterloo, Ontario
Quote:
marioc wrote
HELLO ALL, QUESTION
how many fps would one expect to get from full power(pal) D24`
thanks


If you carefully inspect the Diana 24 air rifle you will notice the letter F in a pentagon. That means so called “Freimark” in German. According to the German firearms law any gun with that “Freimark” CANNOT exceed 7.5 Joules energy at the muzzle. No possession licence is needed in Germany. Therefore, you can estimate the muzzle velocity for any pellet mass. For instance, with standard 7.9gr pellets the muzzle velocity cannot exceed roughly 560fps. For lighter pellets the muzzle velocity can be a bit higher. You can find velocity/energy calculators here: http://www.pyramydair.com/article/What_ ... ust_2003/5
Obviously, if the main spring is modified after importation from Germany then the muzzle velocity could be a bit higher but taking into account the limited volume of a pressure tube, most likely, it would not exceed 600fps with standard 7.9gr pellets and like Penage Guy said could be much harsher.
By the way, I have the 2007 Diana 24C .177cal and it's a sweet shooter. Very accurate, light and ergonomic. I much prefer it than the newer 240 model.


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 Post subject: Re: DIANA 24 .177
PostPosted: Sat May 30, 2015 9:28 am 
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Joined: Tue May 26, 2015 4:51 pm
Posts: 6
thanks, so the ones stamped with F, do they have the full spring, or the shorter detuned spring


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 Post subject: Re: DIANA 24 .177
PostPosted: Sat May 30, 2015 12:16 pm 
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Joined: Sat May 07, 2011 12:09 pm
Posts: 1677
Location: Waterloo, Ontario
Quote:
marioc wrote
thanks, so the ones stamped with F, do they have the full spring, or the shorter detuned spring



There are NO other Diana 24 rifles than those stamped with an F.
In Germany where they are manufactured by the Diana Werk Mayer & Grammelspacher they are engineered to shoot up to 7.5 Joules energy (+-0.5 Joules) at the muzzle which is a FULL spring.
Some buyers in Canada may try to fit a bit stronger spring which doesn’t do much good because the volume of a pressure cylinder is designed to not exceed 7.5 Joules. A very strong spring wouldn’t fit a relatively small Diana 24 cylinder, anyway.
Supposedly, if one replaces the Diana 24 cylinder with a larger one and add a stronger spring then the muzzle energy would most likely increase much above 7.5 Joules. But what's the point in doing something like that?


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 Post subject: Re: DIANA 24 .177
PostPosted: Sat May 30, 2015 1:03 pm 
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Joined: Thu Sep 01, 2005 7:54 pm
Posts: 1794
Location: Sk.
This is all very odd to me. My 177 24 that I bought new in around 2004 made 8.4j and my 2001 22 24 makes 10j. Both bone stock other than cleaning and propper lube, no combustion.


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 Post subject: Re: DIANA 24 .177
PostPosted: Sat May 30, 2015 2:29 pm 
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Joined: Fri Aug 20, 2010 4:30 pm
Posts: 407
Location: SW, Ont
Also very odd, I got a spring from North Sylva for my D24 (2004) and I get about the same 8.2 ft/lbs with JSB RS's
The original spring was very weak and North Sylva said around that time a bunch of very under power D24's came in that way.
They gave me what they said was a stock spring.


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 Post subject: Re: DIANA 24 .177
PostPosted: Sat May 30, 2015 2:52 pm 
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Joined: Sat May 07, 2011 12:09 pm
Posts: 1677
Location: Waterloo, Ontario
Quote:
Mulby wrote
My 177 24 that I bought new in around 2004 made 8.4j


That could be within the error range. Like I said it’s 7.5+-0.5J. With a little bit of dieseling you’ll get 8.4J. I don’t see anything unusual.


Quote:
2001 22 24 makes 10j.



I’ve never tested the Diana 24 .22 cal. Nevertheless, the German Diana Werk Mayer & Grammelspacher website indicates the muzzle velocity of 430fps for the .22cal. Supposing, they used 14gr pellets it comes to 7.8J which is no problem. Close enough.
I have no idea why your Diana 24 .22 cal makes 10J.
Does it have an F in a pentagon? If so, then it must have been upgraded with a stronger spring.


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 Post subject: Re: DIANA 24 .177
PostPosted: Sat May 30, 2015 3:10 pm 
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Joined: Sat May 07, 2011 12:09 pm
Posts: 1677
Location: Waterloo, Ontario
Quote:
jwg wrote
Also very odd, I got a spring from North Sylva for my D24 (2004) and I get about the same 8.2 ft/lbs with JSB RS's
The original spring was very weak and North Sylva said around that time a bunch of very under power D24's came in that way.
They gave me what they said was a stock spring.



First of all, 8.2 ft/lbs is 11 Joules! This is definitely a highly upgraded Diana 24, not German stock anymore. It would require a firearms licence in Germany similar to our PAL. Apparently, the guys from North Sylva didn't know what they were talking about when they said a "stock spring". Perhaps, it was a spring for the Diana 280. I read somewhere that the 280 spring could be fitted to the Diana 24.


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 Post subject: Re: DIANA 24 .177
PostPosted: Sat May 30, 2015 11:38 pm 
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Joined: Thu Sep 01, 2005 7:54 pm
Posts: 1794
Location: Sk.
I think a lot a variables will be at play here, not just markings from factory, but also what parts were used when built. A friend of mine bought a .22 24 a few years after I bought mine and it was consistently around 400fps with 15.9gr pellets. We replaced the provided spring with a factory full power spring(nothing more), and power was right on par with mine.

Not trying to argue. Just my experience with three model 24 rifles all made within a 5 year span.


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 Post subject: Re: DIANA 24 .177
PostPosted: Sun May 31, 2015 8:55 am 
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Joined: Tue May 26, 2015 4:51 pm
Posts: 6
my Diana 24 is no more powerful than a model 20 i use to have, but the 24 is alot bigger and seems like it warrants or has alot more capacity for more power.....I have a Pal, but like the compact size of the 24, just want a little more out of it, I will look into the bigger spring, thanks for the responses


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 Post subject: Re: DIANA 24 .177
PostPosted: Sun May 31, 2015 1:33 pm 
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Joined: Sat May 07, 2011 12:09 pm
Posts: 1677
Location: Waterloo, Ontario
Quote:
Mulby (DIANA 24 .177)
A friend of mine bought a .22 24 a few years after I bought mine and it was consistently around 400fps with 15.9gr pellets. We replaced the provided spring with a factory full power spring(nothing more), and power was right on par with mine.



According to the German firearms law the Diana 24 with an F mark cannot exceed 7.5 Joules at the muzzle to be exempt from a firearms licence. Every stock Diana 24 manufactured in Germany has an F mark. On the Diana website they are listed as not exceeding 580 and 430fps in .177 and .22cal which generates energy close to 7.5 Joules with standard pellets for both calibers.
For the Diana 24’s sold in Canada there is another complication. They must be detuned to not exceed 500fps from the original 580fps. I have no idea how the detuning process is done. May be, the Diana Werk manufacturer makes a special batch of the rifles for the Canadian market with very weak springs? If so those “Canadian” Diana 24’s might have had a very weak spring, indeed. But really this is just a speculation.
There is no problem with the .22cal Diana 24’s because they are limited in Germany to 430fps. 400fps with the .22cal 15.9gr pellets generates 7.66 Joules which is absolutely correct and legal in Germany without a licence and also legal in Canada without a licence because it doesn’t exceed 500fps.
All in all, if the Diana 24 purchased in Canada generates a muzzle energy in excess of 7.5 Joules (plus minus) it means that it, definitely, has a non-stock, higher power spring installed.
You admitted that the original German factory spring was replaced with some other “spring” in your friends .22 cal Diana 24. Apparently, it's much stronger than the factory spring because it shoots at 11 Joules energy. But it was not an original factory spring from Germany which cannot exceed 430fps in .22cal.


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 Post subject: Re: DIANA 24 .177
PostPosted: Sun May 31, 2015 3:16 pm 
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Joined: Thu Sep 01, 2005 7:54 pm
Posts: 1794
Location: Sk.
You win.


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 Post subject: Re: DIANA 24 .177
PostPosted: Sun May 31, 2015 7:32 pm 
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Joined: Fri Aug 20, 2010 4:30 pm
Posts: 407
Location: SW, Ont
I guess North Sylva makes special springs and try's to trick us!!! LOL
My Chrony doesn't lie. 705fps JSB RS, and just re-checked tonight.
Stock special "full power" spring from North Sylva and lube job. Facts are Facts!!!!!!


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