Glide

Good catch. That 15 deg was the angle to the sensor array. That must have been a very gradual deflection to 85 as the mach increases and the nozzle volumes increase at the same time, don't they? Edit. Nevermind. It's a mystery to me how they got those WFE numbers. Fun report. I was a hotshot data center architect in '96. I love how they say "deck". They probably mean a deck of punch cards. We still had them back then.

Climb to cruise. CTC. Note the change in Mach and exhaust volumes in this set. They started at those altitudes, deflected, and let the jet climb to cruise where it was about 15 deg nose up. That's my understanding of the CTC data in table 5. Table 4 was ground. Table 6 was straight and level. Yes?

No sources. I am a pilot, and thermodynamics was one of my favourite classes. The details of the DEEC are not my concern. I am concerned with the realism of the flight model. I am assuming there's some magic involved, but the simulation doesn't care. Once per game loop, DCS will update the sprites with a formula that allows the fuel flow to vary with airspeed. This results in a certain feeling of flight. I am suggesting perhaps fixing the fuel flow variable and getting a much different feeling of flight.

My understanding is there was three batteries of tests: ground, climb to cruise, and straight and level. My understanding is they deflected to 85 and let the jet climb to 15 deg elev in the CTC tests which were acceleration tests.

I think there is some reporting issues on those tables. The tests indicate the CTC were conducted by achieving stable flight, moving the lever to 85 PLA, and measuring the acceleration during climb. However, the tests indicate the START, OH, and END positions were all 85 PLA. This is because of the locations of the microphones and the point in the acceleration when the jet passed the recording zone. This doesn't make too much sense. You deflect to PLA 85, WAIT 5 SEC for the engine to stabilize, then start the climb? What's happening in those 5 seconds? Did they mix that up? Should that have been written, "achieve level flight just below the Mach, stabilize for 5 seconds, then deflect"? Why test a high-NPR jet but not the afterburner acoustics? In my mind, the thrust levers are mechanical in operation even though it's fly by wire. If the lever doesn't move the rate of injection doesn't move unless altitude changes the flow characteristics. Otherwise, what's the point of physical AB detents and marking idle cutoff and idle on the throttle? I am flying along, I move the fuel flow to 3000, but my throttle is not on the mark. I think this is why folks say they don't feel the sense of speed in the game. I think it's not the sense of speed they miss, but the sense that there's a rocket attached to your chair and it wants to accelerate. I think if fuel flow was "stable", we would feel the jet's desire to accelerate more as we bleed off energy in turns and such. Right now it feels like a fast airliner.

I tested this on the Hornet as well. The behaviour is there but not as pronounced. Pull a turn and watch the fuel flow drop in the Hornet by 400pph in 360 degrees. Try the same thing in the Viper. Fuel flow drops like a rock. I don't think either model is correct, but the Viper is at the far end of the spectrum.

well, another week or so, and it could all change with 2.7. Cheers!

Slight? Seems huge. Fly straight and level at 300kts with 3000pph. Move the throttle to just before the AB detent. Then watch the fuel flow creap up by over 1000pph. This does not seem correct to me.

Good article: https://www.pcgamer.com/does-ram-speed-matter-gaming-amd-intel/

I have been wondering lately if the speed of the RAM and VRAM have an impact during swapping. Radeon has that cool memory architecture so DDR6 may not be such a factor. His 2080Ti memory speed is about 40% higher than my 1080Ti. Lots of variables.

Cool reference: https://www.grc.nasa.gov/www/k-12/airplane/turbfan.html

True, but faster air means hotter intake and doesn't the engine limit the intake temps?

After keeping a sharper eye on the behaviour, I see the fuel flow drifts after a throttle input until the airspeed levels off. For example, if I am at 300 kts with ff 3000 and I increase throttle until ff is 4000, the jet will accelerate and the ff will drift upwards until the airspeed levels off.

I am aware that fuel flow will change with altitude and no throttle input, but is it supposed to be stable during straight and level flight? My fuel flow always seems to drift slowly up or down even with AP on. I have a deadzone of 3 in my throttle axis, and I am wondering if my throttle is the issue.

Yes. The Syria map consumes around 28gb of RAM on my 32GB system. 32gb of RAM and at least 11GB of VRAM is pretty future proof for now. High textures or low? My 1080Ti with 11GB starts swapping VRAM on Syria.

No. Just a graphical artifact like the jaggies: a byproduct of rendering water. I believe it gets worse if you have Water = Medium or Low.

When I first started I would go on recon flights to scope out terrain, bridges, roads, etc. Good role for those jets. Can't speak for multiplayer.

This is the shimmering that appears at the edges of the canopy that intersect water at low angles like during takeoff at Batumi.

This is a learning experience as with all things DCS. Deadzones and axis curves make the Viper seem more "boaty" to me. The only reason I had them in the first place was because I read it in a pdf. So I took out the pitch and roll deadzones and made the curves all zero. Now the Viper feels more responsive and less slushy, but my muscle memory is all screwed up. I've added a small deadzone to the throttle to smooth it out. I'll fly this for a week and see how it goes.

I added a deadzone of 2 to my axis, and confirmed the roll rate is slower (Cat 1 fastest, Cat III slower, Landing Gains slowest) with the AAR door open. Got shot down by an Su-25, so no landing test. Got to connect with the tanker no problem, but could not keep it there.

Cool! I will check this out. With AAR, it's all about holding a steady airspeed for me. It's either walking forward too fast or falling back immediately after connect. And then a short push to bring it back in sync with the tanker usually breaks the connect. I don't think it's about deadzone on my hotas. If the flight path marker drifts from the steering que by even a pixel the viper follows.

I have noticed the Su-25's are a lot more fun to have in missions. They are more aggressive and will score gun kills on me if I am not careful. At least I hope they have improved, or I'm getting worse. Thx again.

I have the T16000 set and I just serviced the throttle to be silky smooth, but I can't keep the viper steady enough for AAR. I can fly straight and level with hands off no problem, but I give up on the tanker until things change.

Oh to be young again.

Just ordered a set of these myself. No ETA, but willing to wait. How do you not have every HOTAS ever made my friend? It's been over 20 years!