Works too :P(and sounds better, so it will be MEGA)
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For M0.9/6KM, a 45kg, 3s burn, 250ISP motor gets you to M2.02 in 2s, i dont suspect its much larger(in terms of mass) than that.
And simply simulating the ramjet as a 3000N 80s burn giving about 900ISP, the range is pretty sturdy. And this is roughly 73km in 90s. We’ve heard its 100km in 90s which is immense…
Boost it to 1300ISP and you only get 90km in 90s… and thats reaching peaks of around M5.3…
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I think that’s too much as the booster is integrated into the combustion chamber as a nozzleless booster. I would say the weight is 30 kg at max and you also have to take the much cleaner airframe of the Meteor into account (no canards for example), so drag is much lower especially at high speeds/supersonic.
Yep, so your simulation is 35 seconds too slow and it didn’t even reach 100 km :D
Still has to take the much lower drag of the Meteor into account. Then you can go with much lower ISP and don’t overstep the Mach 5 limit.
I actually expect the ramjet to pose pretty significant drag, it also has static intakes, i gave it a cX of something like 3.4 for this.
Not sure about that, thats what IRIS-T has and meteor is a substantially larger missile in all dimensions.
Yes, but the IRIS-T booster doesn’t just burn for two seconds I assume ^^
I expect this is a limitation of the modelling, most likely it would burn harder when switching from booster to ramjet to quickly get up to “cruise” speed. This would probably close the gap from 90km to 100km.
Indeed, we also dont know if meteor only boosts for 2s, although the comment is M2+ in 2s… it may burn for longer
Just from a calculation standpoint:
- At Mach 3 you get roughly 90 km in 90 seconds
- At Mach 4 you get 90 km in 65 seconds
So if the missile cruises at Mach 4 (max speed is stated to exceed Mach 4 by quite a good margin) it has around 25 seconds and 10 km distance to accelerate to Mach 4. 10 km in 25 seconds is just 400 m/s at average so I assume the cruise speed of the missile is just around Mach 3-4 so its range should be even greater than the 100 km it is stated to reach after 90 seconds. So I assume it still has much of its energy and speed even after reaching 100 km.
If it reaches Mach 2 already two seconds after launch, you can safely assume the missiles cruise speed is much closer to Mach 3 than to Mach 4 during this “90 seconds to 100 km” flight. Or it accelerates really slowly during this whole flight, keeping its engine burning for a long time at maximum efficiency while reaching its topspeed only at the end.
Looks a lot longer than 2s xD, but tbh I might be getting old but I could swear there’s a slight delay in between initial rocket booster (which looks to be around 2 seconds, 2.3-2.40 maybe?) → ramjet starting to work, based on the (reduced!) smoke trail.
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There has to be some kind of delay (the smoke gets dark during that delay in the video) as you have to be absolutely sure the booster burned out and the combustion chamber is free. Otherwise you risk overpressure due to remaining bootlenecks from unburned solid-rocket fuel causing the disintegration of the missile ^^
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Shorter actually, from start of video to apparent burnout of the booster, time is somewhere around ~1.71-1.74s:
From apparent booster cutout to apparent ramjet start is ~2.26s:
For identifying when each phase started/ended, I used the frame in which either the apparent light (likely exhaust flame) disappeared (end of boost phase) or reappeared (start of ramjet)
Imo, you can tell there’s a lag between the end of the boost phase and the start of the ramjet from the different smoke colours.
Thrust phases seem to go:
Thick white → thin white (booster dying out) → (booster cuts out) thin black → (ramjet starts) thin white
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That’s AIM120 SUPER TEMPS
If we’re going by the fact, that the missile already had its booster ignited at the start of the video and gained enough speed to come into the FoV in front of the plane, the booster burn time should be somewhere around 2 seconds ±0,5 seconds.
Hmm… so in terms of an in-game implementation, either:
- The first booster stage’s impulse will need to be powerful enough (~25,000 N) within those 1.74 seconds (keeping a simple and verifiable singular figure to easily reference back to) to get it up to efficient ramjet operating speeds (Mach 3+).
If not, instead of it using the majority of its flight maintaining a certain speed, it will spend fuel not cruising but on trying to increase said speed to the average cruising speeds.
In terms of balancing… it could potentially be one of those “funny, but specific launch condition” missiles, like AIM-120C-5. If you want it to work as intended, Mach 1.6+ launch, if not it’ll be slightly less efficient/slower to impact at longer ranges (in WT normal BVR ranges this would mean an impact time difference of maybe 10-20 seconds, taking into account the ramjet’s gradual acceleration).
So in effect platforms like the Eurofighter or Rafale will benefit more from this even if overall the missile was given thrust impulse (> 25 000 N) allowing it to reach Mach 3 at speeds the JAS39E is most likely to be at in early games, so around Mach 1.2?
Watch them implement a min launch speed condition for it
You can’t see the missile at the start of the video, I ran with the assumption the missile was shot the moment the video started
Technically all missiles do already :P
The hovering harriers are obviously hacking
Yea. Intake just a joke
Forgot it had one :D