here is the sentence at the beginning of the show: "一分钟，军人能做什么。。。", so the whole short video is about what military person(s) can do in one minute.
Aerodynamics thread
- Thread starter siegecrossbow
- Start date
here is the sentence at the beginning of the show: "一分钟，军人能做什么。。。", so the whole short video is about what military person(s) can do in one minute.
Jura The idiot
General
is there a vid of that show available? from what I figured Today at 8:42 AM
it'd be a short one, so somebody proficient in the Chinese language could be willing to translate what exactly they're saying
Ever since it entered service with the Chinese Air Force, domestically developed fifth generation stealth fighter J-20 has expedited its pace on the path to combat readiness. However, many of its tactical statistics are still draped under a veil of secrecy. People's Daily's micro-video "One Minute Soldier", first posted on August 1st, opened a rare window into a J-20 statistic --- it could complete a 52 kilometer combat patrol within one minute. This statistic may imply J-20's top velocity.
It's a bizarre claim, because it's Mach 2.9 and ties into claims that the J-20 is an interceptor, not an air superiority fighter. Moreover, the J-20 is working under impaired engines, with a boost from 140 to 180 kn per engine you'll get an additional 13% max theoretical speed, ignoring airframe stress.
On the other hand, it does have interesting facets; the AIM-120 reaches Mach 4, and with only a Mach 1 speed advantage, it implies that the J-20 intends to get around the rear RCS problem by exiting the opponent's NEZ.
The math comes out to, if you assume that the J-20 is moving at Mach 2.9, and the AIM-120 can reach Mach 4, ignoring acceleration and maneuver times, as well as boost factor from launch vehicles, that the J-20 can reduce the NEZ of the enemy missile to around 50 km.
On the other hand, it does have interesting facets; the AIM-120 reaches Mach 4, and with only a Mach 1 speed advantage, it implies that the J-20 intends to get around the rear RCS problem by exiting the opponent's NEZ.
The math comes out to, if you assume that the J-20 is moving at Mach 2.9, and the AIM-120 can reach Mach 4, ignoring acceleration and maneuver times, as well as boost factor from launch vehicles, that the J-20 can reduce the NEZ of the enemy missile to around 50 km.
I think the number is suspect since that would imply that the J-20 could move at Mig-25/31 level speeds. I don't think that RAM coating could survive the level of heat generated by high velocity friction.
It's better to have a live, but highly damaged airframe, than a wreck and a pilot hoping opfor is not going to try to shoot him out of his parachute with guns. A partial loss can be retrofitted, while a loss will need to be replaced. Moreover, in this modern age, the loss of a highly-skilled pilot is almost impossible to replace.
Moreover, it impacts the tactical assessment. With Mach 3 speeds, you can increase the effective range of your missiles by making it so that the missile only needs to accelerate by Mach 1, meaning that your interception range vs AEW&C is further increased. Reducing the enemy NEZ down to 50 km also means that the opponent will need to fly their fighters even further away from your missiles and thus exposing them closer to your AEW&C + stealth fighter combo.
Somehow, I'm wondering if modern stealth fighter combat will begin to further resemble classical infantry combat. You'll be flying your aicraft in by columns, with the depth of column determining your strength. When AEW&C gets detected, you'll end up flying in two fighters from the back to shoot-and-scoot with long-range anti-AEW&C missiles. If they fail, the front line will attempt an intercept from long range, and then scoot away, hopefully before entering enemy fighter NEZ. Then the next few lines will attempt to knock out enemy fighters with AEW&C detection + EODAS tracking, willing to hit emergency power / speeds as needed to avoid a hard kill.
Moreover, it impacts the tactical assessment. With Mach 3 speeds, you can increase the effective range of your missiles by making it so that the missile only needs to accelerate by Mach 1, meaning that your interception range vs AEW&C is further increased. Reducing the enemy NEZ down to 50 km also means that the opponent will need to fly their fighters even further away from your missiles and thus exposing them closer to your AEW&C + stealth fighter combo.
Somehow, I'm wondering if modern stealth fighter combat will begin to further resemble classical infantry combat. You'll be flying your aicraft in by columns, with the depth of column determining your strength. When AEW&C gets detected, you'll end up flying in two fighters from the back to shoot-and-scoot with long-range anti-AEW&C missiles. If they fail, the front line will attempt an intercept from long range, and then scoot away, hopefully before entering enemy fighter NEZ. Then the next few lines will attempt to knock out enemy fighters with AEW&C detection + EODAS tracking, willing to hit emergency power / speeds as needed to avoid a hard kill.
SinoSoldier
Colonel
Sorry but 52 km in 1 minute indicates a Mach 2.5 speed, not Mach 2.9. This is definitely a very high velocity at sea level but not exactly too uncharacteristic of a delta-winged aircraft.
Air is too dense at sea level for conventionally skinned aircraft to fly faster than about 1500km/h without being subjected to dangerous temperatures and stresses. An airspeed of 3120km/h is 1. highly suspect and 2. definitely reached only at high altitudes if it's real. Mach number is given for the properties of the freestream in question, not relative to MSL datum. Since the only possible freestream is a high-altitude freestream, 3120km/h can only be Mach 2.9 in this context.