Help me please :(
I've been making a Sukhoi SU-35UB, Its all fun and games but there's one tiny problem.
It's the flightmodel and especially the flight characteristics during PSM. It feels unstable and kinda unpredictable. it feels way too underpowerd while the Thrust/Weight ratio is kinda right. During post stall it kinda feels too twitchy and above a certain speed its almost impossible to get it to do PSM (not even a cobra).
I've been trying to fix it, it flies better than before but im still not happy with the results, I just can't figure it out with my current skill in this game.
So.. Could someone with more expierence than me please take a look at this aircraft? I'm kinda desperate at this point....
Some info on the plane below
Settings/inpute for ailerons
Settings/input for TVC rotator
@Gro
I'll just clarify everything for you lol. In order of the reply I guess.
- Wing loading is number that tell you how much weight each square meters of wing holding, it's useful tool for estimating how light or how sluggish and how likely to stall the plane really is.
- Don't worry about CoL and CoM touching, just go with what work and don't forget that CoM can and will shift as the fuel burn.
- The code I used in SU-27 was broken after an update long ago so just don't touch it lol. It used to fly more beautifully than it is today.
- I just breakdown the code, there is a part that correcting aoa for the plane, disabling that part will allow the plane to stall. Have you watched my tutorial? it'll help a lot in understanding this code.
- lol, can't argue with physic really.
- "So when I pitched the aircraft up and let go of pitch, the rotator would move in the other direction." Yeah, that's the FT doing it's work, it cancel out the excessive pitch movement (and maybe excessive aoa), all it tried to do is keep the rate and aoa to 0, my plane have been doing that since forever.
@AWESOMENESS360 Thanks, he's already here :)
One little disclaimer, the closer you get the worse it looks. Some parts are a bit "rough" and don't look to good
@Kangy hmm i see. Thank you
@Augusta81 im not a really fan of gyros in aircraft. Some stabilization code could be nice tho
@Bellcat attachments for missiles? Indont have them yet. There are a few missing details but i first need to figure out the flight model before i add even more parts.
@GuyFolk damn, well thank you.
·I dont really understand what wingloading does and how to adjust it.
·Ive tweaked the Com and Col, but of they get too close to each other it will become even more "twitchy".
·codes are like magic to me. I think its a code you put in your old SU 27 for it vertical stabilizers. I changed some numbers but honestly i dont really know what im doing.
·I dont really understand what you mean by " I assume AG2 is PSM mode, you can just leave those *Rate/x running and disable only aoa part, only aoa matter in this context."
·okay, so it would be a bit unrealistic to make it do PSM at higher speeds.
·i tried putting the code for horizontal stabilizers in the TVC rotators but it didnt really work. It cancled the movement (?). So when I pitched the aircraft up and let go of pitch, the rotator would move in the other direction.
With some tricks with gyro or ft
Just tag me in an unlisted post.
Here are my opinion judging from the stat alone.
- Wing loading is a bit low with all added weight so it'll need more force to stall the plane. I just made a quick calculation of wing loading from Wiki, it'll be around 260 when empty and 491 at max takeoff weight.
- Position of CoM and CoL can be tricky, Flanker should have some static stability because it can do and recover from Cobra even without tvc.
- From the code I assume it is from horizontal stabilizer, I think it is not sensitive enough judging by large number that "rate" were divided by so the "correction of rates" will be so little it barely effect flight except for aoa because it is about right.
- I assume AG2 is PSM mode, you can just leave those *Rate/x running and disable only aoa part, only aoa matter in this context.
- It is natural for the plane to not stall at high speed because it require greater force and/or higher aoa to stall (ie. at low speed, 10 deg. aoa will stall the plane while at 500 km/h it will manage 10 deg. aoa just fine), decreasing stability do help but there is always limitation so don't worry too much. Even Ace Combat plane can't so PSM at high speed, that's one of a few things they get right.
- The code should be applied to tvc as well, I think it is twitchy in PSM because your control surface with code won't be effective and the only control you have is non-coded tvc.
This beauty deserves an equally beautiful flight model.
That's all from me.
Deez nuts
Have you put more attachments to your wings? Have you got any missing details?
CoL and CoM should be touching more, instability is king for PSM stuff
Needs to be more unstable
Try contacting GuyFolk, they’re the master of PSM’s in SimplePlanes. This SU-35 looks freakin awesome btw, probably one of the most detailed I’ve ever seen, and the warpaint is amazingly well done!
@Gro could you maybe put the plane as unlisted and give me a link to test it?
Though I don't know much about the "Hackerman" writing, but I do know where it may be wrong and what is wrong