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Author Topic: Nose Mounted Cannon  (Read 1482 times)

Offline moot

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Re: Nose Mounted Cannon
« Reply #15 on: April 26, 2009, 05:46:29 AM »
Ammo counters, combat trim, etc.
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Offline Cthulhu

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Re: Nose Mounted Cannon
« Reply #16 on: April 26, 2009, 09:34:20 AM »
Quote from: BaDkaRmA158Th on April 26, 2009, 05:31:55 AM
Is this telling me any and all nose hub cannon mounted planes should not have the ability to set the cannon fall off distance?

109's 39's .ect

If so i would like the option removed on my 39's, i don't care for gaming a game, but..for realism's sake it would be nice.
Not necessarily. The unique layout of the P-39 may mean that elevation is adjustable. Someone needs to research it to verify if it is fixed.
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Offline Stoney

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Re: Nose Mounted Cannon
« Reply #17 on: April 26, 2009, 10:27:32 AM »
Quote from: BaDkaRmA158Th on April 26, 2009, 05:31:55 AM
Is this telling me any and all nose hub cannon mounted planes should not have the ability to set the cannon fall off distance?

The only one I feel confident about are the hub mounted Mk108.  I've not seen any documentation about the others, though I suspect that while they're may be some adjustment available, its probably limited.  How limited I don't know.  There may be some information in America's Hundred Thousand about the P-39; I'll have to check.
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Offline Motherland

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Re: Nose Mounted Cannon
« Reply #18 on: April 26, 2009, 05:40:29 PM »
Sorry for the hijack, but how exactly was the P39's cannon mounted? The cannon's barrel going through the engine block makes sense to me, but the Airacobra's was in front of the engine, wasn't it? How was the propeller hooked up to the engine?
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Offline StokesAk

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Re: Nose Mounted Cannon
« Reply #19 on: April 26, 2009, 05:47:07 PM »
I would think a drive shaft that goes through the plane into the back of the prop, then the 37mm was mounted against the front of the prop
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Offline Motherland

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Re: Nose Mounted Cannon
« Reply #20 on: April 26, 2009, 05:48:22 PM »
Quote from: StokesAk on April 26, 2009, 05:47:07 PM
I would think a drive shaft that goes through the plane into the back of the prop, then the 37mm was mounted against the front of the prop
The propeller hub is like, what, one foot deep, and 2-3 feet across? No way you could fit a 37mm auto-cannon and 30 rounds of ammunition in there.
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Offline gripen

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Re: Nose Mounted Cannon
« Reply #21 on: April 26, 2009, 05:59:33 PM »
The reduction gear is located to the nose in the P-39 allowing the canon installation.
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Offline Cthulhu

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Re: Nose Mounted Cannon
« Reply #22 on: April 26, 2009, 06:00:23 PM »
Guys, the crankshaft is not on the same axis as the prop for most inlines. There is an offset due to the reduction gear. The spinner mounted cannon is nestled down in the "Vee" of the engine between the two cylinder banks.

Here's a Merlin to illustrate the point: 


Quote from: gripen on April 26, 2009, 05:59:33 PM
The reduction gear is located to the nose in the P-39 allowing the canon installation.
Yep, but really it's the longish distance from the firewall to the prop that let Bell get that big gun in there.

Here's a picture I found illustrating the P-39 drivetrain & cannon:
(that baby blue housing behind the prop is the reduction gear)

That cannon appears to be canted up slightly doesn't it?  ;)
« Last Edit: April 26, 2009, 06:22:54 PM by Cthulhu »
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Offline Motherland

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Re: Nose Mounted Cannon
« Reply #23 on: April 26, 2009, 06:42:56 PM »
Cool, thanks Cthulhu! I always thought that the MK108/ MG151 just fired through a hollow drive shaft or whatever you call it.
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Offline Stoney

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Re: Nose Mounted Cannon
« Reply #24 on: April 26, 2009, 09:06:30 PM »
Quote from: Motherland on April 26, 2009, 06:42:56 PM
Cool, thanks Cthulhu! I always thought that the MK108/ MG151 just fired through a hollow drive shaft or whatever you call it.

Someone with the resource is going to post a picture or drawing I would imagine, but the Mk108 cannon installation was not set up the same way the P-39 was.  The P-39 installation is rather ingenious, as it allows full manipulation of the weapon with interfering with the prop shaft.  I went looking online to see if I could find the information I saw a few years ago that showed the installation; I could not find it.  Regardless, I'm sure someone does, and you will see how the short barreled cannon, and the way it was wedged in with the engine, made a fixed mount pretty much mandatory. 
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Offline Cthulhu

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Re: Nose Mounted Cannon
« Reply #25 on: April 26, 2009, 09:15:44 PM »
Quote from: Stoney on April 26, 2009, 09:06:30 PM
Someone with the resource is going to post a picture or drawing I would imagine, but the Mk108 cannon installation was not set up the same way the P-39 was.  The P-39 installation is rather ingenious, as it allows full manipulation of the weapon with interfering with the prop shaft.  I went looking online to see if I could find the information I saw a few years ago that showed the installation; I could not find it.  Regardless, I'm sure someone does, and you will see how the short barreled cannon, and the way it was wedged in with the engine, made a fixed mount pretty much mandatory. 
Agreed Stoney. I think we'll find the P-39 is the only plane with an adjustable gun mount.
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Offline Charge

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Re: Nose Mounted Cannon
« Reply #26 on: April 27, 2009, 04:27:42 AM »
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