Bouncing needles

[II./JG1_Krupinski]

I've been playing with this and have found a few things.

First, I don't have a lot of CoD cockpit time so take this with a grain of salt. I use full real settings as the starting point. and using the German France freeflight quick mission/

I first noticed the shaking on my first flight, which happened to start about 10 seconds before I lubricated my wind screen for a total of 10 seconds flight time. Okay, bad engine management.

Determining the best manner to manage my engine I still noticed the shake, even with oil temp maintaining between 40 and 60 C and water a little above 80C. Tooling around I am setting the engine up @ 1.2 ATA and about 2100-2200 RPM.

I was able to fly to England and back. Over England, I was able to see no shake for about 30 seconds. What I had done was dove to about 800 meters ASL. So a couple things were at play here, lower altitude and faster airspeed. The shaking returned as i climbed and slowed. I thought it was speed at this point.

Starting another quick mission, I tried to tool around at a minimum 450kph. Still, shaking happened. Try this at lower altitude, its shaking.

All manner of tests using full real, I came up empty handed.

Finally giving up and not being able to take the shake, I turn of turbulence in the settings as a last ditch hope of finding what's going on. BINGO! no more shake.

So this shake that I thought was my bad engine management, seems to be caused by turbulence. I am going to test this more tonight.

[Space Communist]

Well I have only been in the cockpit of an aircraft once, a 60 year old Piper. Every instrument in that thing bounced around constantly, just as I have seen happen in many of the videos.

Sounds like this isn't the case with more modern aircraft?

[RAF74_Winger]

I've flown aircraft of similar vintage, but never seen the needles shake around like that, not even during aerobatics or heavy turbulence. There are restrictors in the inlet lines to all of these pressure driven (bourdon tube) gauges for precisely this purpose - besides which the accumulated fatigue damage to the bourdon tube would soon result in a broken instrument if it weren't present.

W.

[Buzpilot]

I would say that engines running at the best in CoD, even then, are somewhat broken.
Mixture don't get sufficient lean ?

[Zoom2136]

Originally Posted by Buzpilot

I would say that engines running at the best in CoD, even then, are somewhat broken.
Mixture don't get sufficient lean ?

What we can't lean past peek EGT

[Space Communist]

Originally Posted by RAF74_Winger

I've flown aircraft of similar vintage, but never seen the needles shake around like that, not even during aerobatics or heavy turbulence. There are restrictors in the inlet lines to all of these pressure driven (bourdon tube) gauges for precisely this purpose - besides which the accumulated fatigue damage to the bourdon tube would soon result in a broken instrument if it weren't present.

W.

Interesting. Well I dunno what was up with this plane I was in then. Doing a brief internet search and finding some images I am confident the plane I went up in (which had very bouncy instruments indeed) was a Piper PA-17, if that helps.

Edit: I initially thought it was a J-3 but i was mistaken