WesWorld

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Originally posted by Red Admiral
What about upscaling a 0.50" Browning instead like the Japanese. Chambering for the 20x72RB or preferably the 20x100RB round with some strengthening to parts of the gun in order to keep the rate of fire up. Looking at the Ho-5 cannon, with the 20x100RB you'll have a gun thats a bit heavier (maybe 40kg) and fires around 600rpm with 750m/s mv and a reasonable shell. The rate of fire would drop for the synchronised versions to around the 450rpm of the 0.50" M2.

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That gun will not lay in the valley of that engine he plans to use for his indigenous fighter, RA.

But its a radial engine and the guns fire around the outside of it. The drawing does look like there is an engine mounted gun (and photos of the actual plane in OTL) but that is impossible. Case ejection through the fuselage sides.

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Originally posted by Vukovlad

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Originally posted by howard
That gun will not lay in the valley of that engine he plans to use for his indigenous fighter, RA. The barrel will be too long and the recoil travel too violent for the space he needs to cram it into.

Not to mention how is he going to expend spent brass?

H.

You know that a gun of roughly those dimensions were planned for the real I-28?

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Originally posted by Red Admiral
To me it looks more like its overbalanced aft with the cockpit being set very far back. I'd probably want a larger vertical stabiliser as well. Most of the armament weight is over the wing and shouldn't effect the CoG much.

4x15mm HMG should give fairly decent firepower for the time being. You don't need to go shooting down heavy bombers yet. Something like the ShVAK should be possible using the 20x100RB round or similar. More power means more weight and length which could give problems with the light wooden construction of the aircraft.

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Originally posted by Red Admiral

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And yes if you read the description of how the aircraft bombed into the ground,

All the information given is that the prototype crashed in a terminal velocity dive. Deducing that there was too much mass forwards isn't intuitive. There are a many great other possibilities. Structural problems caused by the poor wooden construction is more likely.

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Originally posted by Hrolf Hakonson
The whole recoil/weight thing is one reason why Germany might end up staying with the historical MG-151/20 over the longer-cased, higher velocity version of the same weapon made by NOT shortening the 15mm x 96 case to 82mm to keep the overall length the same between rounds for the 15mm MG-151 and the 20mm MG-151/20. Conceptually, I like the higher velocity of the longer round, but the weight and recoil penalties of it need to be looked at. Not much of a problem to a Fw-190, but the Bf-109 might have a problem with it (especially if more than 1 were to be mounted). I also like the 20mm x 135 round developed for the MG-213C, but it has the same problem in spades.