Author Topic: Spinner Guns (Read 1098 times)

scottydawg · « **on:** January 17, 2007, 07:39:01 AM »

Can anyone explain to me (or direct me to an explanation) how spinner guns work? Is the gun inside the engine? I mean, a hollow crankshaft? Or is the reduction gear for the prop offset so that the gun is above or below the engine?

Thanks in advance.

Viking · « **Reply #1 on:** January 17, 2007, 09:33:46 AM »

The latter.

MiloMorai · « **Reply #2 on:** January 17, 2007, 09:44:43 AM »

Scotty how would a hollow crankshaft work? How does one time the 'bullets' to miss the connecting rods?

DB601 crankshaft

cutaway drawing of a Db engine, http://www.aviation-history.com/engines/db605.htm

scottydawg · « **Reply #3 on:** January 17, 2007, 10:44:48 AM »

Quote

Originally posted by MiloMorai
Scotty how would a hollow crankshaft work? How does one time the 'bullets' to miss the connecting rods?

DB601 crankshaft

cutaway drawing of a Db engine, http://www.aviation-history.com/engines/db605.htm

Good point. Didn't really think about it. So... do you have an answer or did you just post to tell me I'm a handsomehunk?

MiloMorai · « **Reply #4 on:** January 17, 2007, 12:12:48 PM »

If you want to take that way OK.

Take a look at the cutaway drawing which shows the position of the blast tube.

Bronk · « **Reply #5 on:** January 17, 2007, 12:17:06 PM »

Bloody Germans and their upside down engine.

Bronk

scottydawg · « **Reply #6 on:** January 17, 2007, 12:24:16 PM »

Quote

Originally posted by MiloMorai
If you want to take that way OK.

Take a look at the cutaway drawing which shows the position of the blast tube.

I see. Thanks. Overhead cams, eh? How German.

Bronk · « **Reply #7 on:** January 17, 2007, 12:35:35 PM »

Quote

Originally posted by scottydawg
I see. Thanks. Overhead cams, eh? How German.

Since it's an upside down engine .
Makes them underhead cams.

Bronk

scottydawg · « **Reply #8 on:** January 17, 2007, 12:40:03 PM »

Quote

Originally posted by Bronk
Since it's an upside down engine .
Makes them underhead cams.

Bronk

True.

Krusty · « **Reply #9 on:** January 17, 2007, 12:59:48 PM »

A succinct way of saying it is that the engine is an "inverted-vee", and the gun sits between the arms of the "vee".

Spikes · « **Reply #10 on:** January 17, 2007, 06:10:26 PM »

if its in the nose like a G14 and K4, id assume its just shooting out of it

sometimes if you look closely, you see the rounds spin a little

Wes14 · « **Reply #11 on:** January 17, 2007, 06:16:01 PM »

Dude Spikes if its a rifled barrel its gonna spin no matter if the dam prop is spinning/stopped/full WEP:p

Spikes · « **Reply #12 on:** January 17, 2007, 06:16:52 PM »

i mean that go in tiny circles

mussie · « **Reply #13 on:** January 18, 2007, 03:05:33 AM »

From the same site:

P-39 Engine, Driveshaft Reductionbox and hub Cannon

An interesting statment on the P40 From the same page as the above pic

Quote

The few turbo-supercharged Allisons that were made, were allocated to P-38s, making the high-altitude performance of that plane its best feature. All 14,000 P-40s got gear-driven superchargers, and as a result, were never first-class fighter planes. Donaldson R. Berlin, the P-40's designer, has said that P-40s experimentally equipped with turbo-superchargers outperformed Spitfires and Messerschmitts and that if it had been given the engine it was designed for, the P-40 would have been the greatest fighter of its era. This may be to some extent the bias of a proud parent, but there is no doubt that the deletion of the turbo-supercharger ruined the P-39 .

2bighorn · « **Reply #14 on:** January 18, 2007, 06:45:18 AM »

Quote

Originally posted by mussie
and that if it had been given the engine it was designed for, the P-40 would have been the greatest fighter of its era.

Blah, P-40 was nothing but P-36 with inline instead of radial engine.

YP-37 was build with turbosupercharged engine in mind but proved to be too much for Curtiss/Allison combo