EDITED!
Before the actuators where updated in 1.6(?) to make them less "floaty" this plane had minor issues with clipping actuators in the complex landing gear making the plane go bananas. This was usually easily fixed by a respawn or by operating the landing gear, but after the update to actuators they just freak out every time so I have had to completely rebuild and simplify the landing gear.
If you don't get the updated version try to unsub and resub, this forces Steam to DL the file again locally.

Since the amount of lift is so vastly different depending on the speed (there's bsically NO lift under 100 kph in 1.3) most planes that take off ok and fly ok under 200 kph will take off as a rocket from the increased lift at speeds over 250-350 kph. The difference is huge.

Yeah they're usually hidden near the front edge in the main flat part of the stabilizer and connected to Custom 0 or 254, and in this case another set connected to Custom 253. So try adding a degree or two to the Max angle and see if that helps. If it pitches down at all speeds just another stationary one if needed.
I hope you can get it to work better for you. :)

Okay, didn't know there were trim elevators

Yeah it's too bad so many core mechanics are still so flawed because the concept is so good and it could be a truly awesome game instead of a fun but severely flawed one.
If you are at all familiar with using the editor all my planes have some trim elevators hidden in the rear stabilizer. They're connected to a speed sensor and try to trim the plane at various speeds since lift changes SO much from under 100 kph to over and then again from over 220 kph and then again from over 450-500 kph it's impossible to get a plane to fly straight at all speeds without some severe trimming. So if you feel like please do change the Max Angle on those trim flaps and add +1 or 2 or 3 degrees and see if that helps.

yeah, brick rigs is kinda flawed

Until Fluppi disconnects the game physics from FPS (and fixes MP lag which probably will never happen) crap like this wil continue to happen sadly.
I have a submarine that I worked for hours trimming and getting to float just right with and without the torpedoes in it and I got it working pretty well. The I spawned in a couple of large ships to test the torpedoes on and my FPS went from 144 to 55-60 and then the sub was suddlenly floating at a 45 degree angle in the water, nose up, and nothing could be done about it.
It's an amazing game in many ways but sadly some very core mechanics are still very broken after all this time, and I somehow feel that Fluppi is more focused on bringing the players all the bells and whistles they demand rather than fixing the core issues of physics/fps/multiplayer/netcode etc. that make the game behave so very erratically in many ways.
I hope I'm wrong but...

alright, thank you very much

Are you using version 1.3? If you're using 1.2 or Legacy they won't work.
If you are using 1.3 -I of course try to trim them so they don't, but that's what works for me in single player on my PC with 144 FPS. As has been stated many times before the game physics including aerodynamics are extremely dependent on FPS and possible server lag which means no matter how much I try to trim it in SP on my PC it will behave completely differently at lower (or higher I'm sure) FPS and especially if there's some servaer latency/lag, so there's very little I can do about it I'm afraid.

Why do all of your planes pitch down?

Nice. :)

i have a start to a DC-2 based on this i have the rudder shape ok so have to make it smaller and edit the wings and tail a bit

Feel free to use my DC-3 and make it yourself. I'm a bit busy converting 100+ planes from 1.2 to 1.3.

I mean, it's just changing the left wing slightly plus a paintjob. Seriously, DC-2.5 is just a DC-3 with the right wing of a DC-2 from the engine out

No more passenger/cargo planes for me for a while I think. :)

to the guy who asked about the DC-2 1/2 maybe just a DC-2? i have it on FSX

Haha nah I don't think so. After I'm done adapting all my planes to 1.3 I'll probably build the Soviet Pe-2 or Il-2 since I'm a bit thin on the Eastern front. ;)

Heh, that'll be fun. Now, buddy, it's time for a DC 2 1/2.

If Fluppi ever allows your own sound clips in the game I'll make sure to add the "Nice try, Lao Che!" whenever the door closes. 😁

LOL. We'll see, I very much prefer WW2 planes but I can put it on my list. If I ever make it I'll make a version with a dropable rubber raft that acts like a parachute. ;)
No promises though.

You should do a Ford Trimotor next. I need to be able to yell "SO LONG, LAO CHE" upon takeoff.