SinusoidDelta

I wasn’t disagreeing with you. I’ve felt infrasound at high SPL’s as well. It isn’t pleasant. I’ve also seen hornets, superhornets, F-16’s, F-22 and others take off in person at close range. There is airframe generated and engine generated noise. Even at subsonic speeds local portions of the airframe are undergoing transonic and supersonic flow. A large portion of what you hear and feel is essentially the jet tearing a hole through the air. The F-22 out of AB is especially loud. Regarding engine noise, check out this paper on measuring the F-22 jet plume noise. Afterburner in the tests increases SPL in a very specific region compared to mil power (roughly the 20 and 25 1/3 octave bands). Also notable is how SPL drastically peaks at about 30 ft. I imagine due to the distance required for long wavelengths to propagate. http://www.sandv.com/downloads/1008jame.pdf

The -1 describes the entire preflight, taxi and take off procedure. Most of it is irrelevant since the systems don’t exist in DCS.

A big factor in “feeling” the sound is that the human chest is resonant in the 50-80hz range at high SPL.

According to that logic then, a 30mm (1.2ish inch) cannon .5 mil 100% circle would mean all rounds fly through a 6 inch hole at 1000 feet?

:smilewink: Roger that. So we just need something to shoot at ;) Edit: Does the F-5E have a ground safety or breaker? I’ll have to look into that first.

Haha! Thanks for the detailed reply. It is maddening trying to derive the units. I asked a few people and no one seems to know what they are. You described basically my image for testing in DCS. 1) I think placing the aircraft in mission editor should allow accurate enough distance measurement. In mission replay we can slow time down I forget the key binding atm) to the minimum and see if that allows us to see the round in flight. 2) This is outside my area of expertise. Maybe someone can chime in who is familiar with modeling. I could create a simple texture but I don’t have 3DS max to create new objects. 3) I can try immobilizing the A-10 or F-5E suspension config lua and increase the braking force / tire friction coefficients. A hackish way to increase the mass maybe to alter the weight of stores to some extremely large value. . Also I think it may be possible to make every round a tracer through the shell lua file. I’ll give it a shot tonight. No pun intended.

Which is why I asked two posts before yours if anyone has an idea how we can test dispersion in DCS...

Im not sure what you’re asking. We don’t have any accurate way to test the spread in DCS yet. We don’t know what units are being used in the lua but they certainly aren’t milliradians.

That too. With emergency FBW gain it seems like the control authority exists to push the nose down. Perhaps it’s a control law issue?

+1 I also had flameouts attempting the tailslide. What appears different in DCS vs the video is how abruptly the jet loses lift IRL. In DCS it very gradually slows them basically hangs up for a few seconds then enters a roll departure (without heavy control input). I’m not sure if it’s an issue with idle thrust being to high or something due to drag (maybe related to the excessive glide ratio?). Assuming it is in fact an issue.

Excellent post BeamScanner. So you’re of the opinion FLOOD mode should not trigger a launch warning? That was my thinking as well.

None of my lua hackery worked. Can’t get the cannon to fire on the ground. An alternative would be to test the A-10C cannon on the ground to derive whatever units the LUA file is using from the GAU-8. Possibly some other aircraft have the capability too. Maybe a custom object with a target texture. It seems odd how much larger the values are for the M61 and GAU-8 compared to nearly every cannon defined weapon in the shell table lua. Aries, you seem to be well versed in the testing procedure. Any ideas as to how we could simulate it in DCS? Meh. I’m not a proud man. I’d rather look like a fool and learn why I’m wrong than not try at all. That’s the only way learn. Edit: Some test footage, skip to 4ish minutes

I completely missed the bit about the lua file. My bad. Milliradians should be .00X radians, right?

Yeah, I worded that poorly. Regardless it should be 8 mil dispersion 80% circle. A quick and dirty way is milliradians will equal the diameter of the circle (in feet) at 1000 feet almost exactly: Tan(.008 rad)*1000 How are you testing it in DCS? I’ve wondered how accurately it’s modeled but never tested.

IIRC the M61 should have an 8 mil dispersion at 1000 feet. So 90% of the bullets should pass through an 8 foot diameter circle at 1,000 feet.

It already makes a very noticeable thump when engaging AB and for each stage.

I'm running the latest openbeta. No acmi's are being generated for me.

I tried the tail slide maneuver a few times after seeing that video. I figured 50% fuel and a magic on the outermost pylons might improve lateral stability / reduce the roll / spin departure modes. I found retracting slats and temporarily flipping to EMERG FBW allowed me nose over faster though not as fast as it appears in the video. The longer I let the jet tailslide before pushing over the more likely the engine would stall. I can definitely see what that maneuver would be prohibited.

I’ll be trying it out shortly. Very excite.

-229 perf charts are available. I have a copy.

In my opinion a deadzone itself can make precision input more difficult, especially the larger the deadzone is. When the stick input breaks out of the dead zone it tends to move quite abruptly. Having a very very slight slope response (with the user curve) near the stick center position doesn’t have the ‘jumpiness’ problem that a hard deadzone does. Just my .02 cents. I’ve seen posts about some type of magnet mod to fix the X-52 drift issues. Not sure if it works or is a permanent fix. What does the axis response look like in saitek properties?

I use the “user curve” option. This is an really rough example. I’ll post the refined one I use when I’m at my PC.

Looking forward to it! Happy Thanksgiving!

This is where you lose me. Unless you turn off or have lost electrical power all the information (AoA, IAS, altitude, etc.) is right there, directly in front of you on your HUD. You don’t need to be heads down to see any of it. Just remember to be aware of your weight (fuel gauge and stores) before the approach. You’d have to be willfully ignoring it to not see this information while looking out the canopy.

I don’t mean to oversell the Wheatstone bridge but it would allow precisely that; commanding a force. Here’s an example of what I mean (note this is a rigid stick but the strain gauging technique still applies) It would also allow nearly any gimbal design to be adapted to FFB. Once you’re familiar with shunt calibration almost any metal object can be turned into a load cell. It would also serve as the “hand sensor” you mentioned. I understand it adds a layer of complexity though.