DCS FIGHTER PILOT Posted May 22, 2021 Posted May 22, 2021 (edited) I am curious as to whether or not the top speed on the Aim-54, particularly the Aim-54 Mk60, is a “DCSism” considering the fact that usually during mid course guidance, the missile suddenly changes its vertical trajectory bleeding off literally hundreds of knots of airspeed. As I recall, this is due to a de-sync issue that has plagued the missile from the very start. If and when this problem is ever fixed, will the top speed on the missiles come down or is it correct as is? Edited May 22, 2021 by DCS FIGHTER PILOT
dundun92 Posted May 22, 2021 Posted May 22, 2021 The aerodynamics of the AIM-54 is fine. The loft is an entirely separate issue. 1 Eagle Enthusiast, Fresco Fan. Patiently waiting for the F-15E. Clicky F-15C when? HP Z400 Workstation Intel Xeon W3680 (i7-980X) OC'd to 4.0 GHz, EVGA GTX 1060 6GB SSC Gaming, 24 GB DDR3 RAM, 500GB Crucial MX500 SSD. Thrustmaster T16000M FCS HOTAS, DIY opentrack head-tracking. I upload DCS videos here https://www.youtube.com/channel/UC0-7L3Z5nJ-QUX5M7Dh1pGg
DCS FIGHTER PILOT Posted May 22, 2021 Author Posted May 22, 2021 2 minutes ago, dundun92 said: The aerodynamics of the AIM-54 is fine. The loft is an entirely separate issue. I suppose I was just wondering if the high top speed given to the Phoenix was meant to compensate for the loft issue but it sounds as if this is not the case.
GGTharos Posted May 26, 2021 Posted May 26, 2021 (edited) No, guidance is a separate issue and none of this has to do with desync AFAIK. NASA has/had a paper on projected Phoenix trajectories, showing it capable of reaching mach 5 speeds. This doesn't necessarily correspond to our guided missile exactly, but it should be quite close. The military shot and the NASA shot have different purpose and trajectories so there's that to factor in as well. A new mid-course algorithm should alleviate the sudden switch from loft to PN 'jerk'. In other words, you can expect the Phoenix to retain more terminal smash in the situations where you see it doing this. Edited May 26, 2021 by GGTharos 3 [sIGPIC][/sIGPIC] Reminder: SAM = Speed Bump :D I used to play flight sims like you, but then I took a slammer to the knee - Yoda
Max1mus Posted May 30, 2021 Posted May 30, 2021 In DCS, the AIM-120 is capable of reaching mach 5-6. The AIM-54 will do at least 6 mach. Is NASA worse at testing missiles than flight sim nerds with tacview? When ED reworks russian missiles: Spoiler https://imgur.com/VoBlY9n (April 2021 update)
GGTharos Posted May 30, 2021 Posted May 30, 2021 (edited) NASA published the PMHT documents which are not the results of shots (although they are very good at making the predictions) but their shots don't resemble AAM shots at all and the different trajectory could result in higher speed. They give you an idea of what the missile would do under certain circumstances, but it's still a presentation of a science shot and not a combat shot or trajectory. It can certainly help tune the missile assuming the presented trajectory coincides with the AAM weight, which it may not (sensors, fuze and warhead are removed to make space for a science payload). Could the 120 hit mach 5+ when launched at M2? Who knows, the CFD seems to imply that maybe yes. Edited May 30, 2021 by GGTharos [sIGPIC][/sIGPIC] Reminder: SAM = Speed Bump :D I used to play flight sims like you, but then I took a slammer to the knee - Yoda
Cmptohocah Posted June 3, 2021 Posted June 3, 2021 (edited) On 5/30/2021 at 4:40 PM, GGTharos said: ... Could the 120 hit mach 5+ when launched at M2? Who knows, the CFD seems to imply that maybe yes. I could be wrong on this one, but I think missiles should have "top" speed due to drag. What I mean by this is that aircraft speed should not just be added to the missile. For example: if the launch platform goes M10.0 the missile should not go M12.0. Edited June 3, 2021 by Cmptohocah Cmptohocah=CMPTOHOCAH
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