View Full Version : P38 just a question

02-26-2006, 12:47 AM

I hadnt realy time for online playing till yesterday.
Ok Yesterday i was taking the P38(tm??) out for a ride, i didnt noticed it first, but when i flew home, i found the 38 rolling (very slow) to the left all the time, i had to do 2 clicks to to the right to stop this rolling.
I asked by chatbar if the other had that rolling, one had the other couldnt notice it.

So i thought maybe calibration, so todat i fired the game up on my other pc it has a X52 and again the rolling to the left.

Is this normal behaviour??? (its not a showstopper) cos the 38 has contrarotatingprops, or is it pure detail , like someone mentioned QUOTE: its good to me cos you cant get 2 engines running 100% insync"

Just a question cos i hadnt to trim in 403.


Ps dont mind errors in my english http://forums.ubi.com/images/smilies/16x16_smiley-very-happy.gif

02-26-2006, 07:25 AM
Do you have your rudder trim on the rotary dial or just by keyboard?

Perhaps you had some damage to one of the engines and the RPM was a bit lower. Rarely do I have to use rudder trim in a P-38 and I've flown the J in a few COOP's since 4.04 came out.

02-26-2006, 08:29 AM

No i have my trim on the keyboard, and i had no damage.
I tried it again in QMB , but i had to trim the wings 2 clicks, not the rudder.

I have tried it on 2 pc's and they both gave the same result , plane rolls slowly over the left wing. http://forums.ubi.com/images/smilies/compsmash.gif
it looks like its a single engine plane, very slowly rolling over its lenghtaxis (Hope its english but i doubt http://forums.ubi.com/images/smilies/disagree.gif )

Btw the way it was the 38 late, i have flown the 38 J but i didnt noticed it, (lol was to busy fighting zero's and KI) http://forums.ubi.com/images/smilies/winky.gif

02-26-2006, 08:40 AM
Apparently this is a bug, the P-38 should not behave this way.

Getting the engines "in-sync"...to my mind that causes sympathetic vibration if you have each engine running in-sync, which will cause damage to the airframe. Think of an army marching across a bridge in-step http://forums.ubi.com/images/smilies/16x16_smiley-surprised.gif

The effect of the engine's rotation- rpm- should be more important. Making torque and horsepower shouldn't depend on which stroke I'm on; these aren't single cylinder engines. if engine 1 is on the power stroke on the #1 cylinder and engine 2 is 150* behind that power stroke on the same cylinder...what does it matter, if they are both at the same rpm and prop pitch? The net effect should be the same. The crankshaft rotation doesn't 'care' what cylinder's on intake or exhaust strokes

02-26-2006, 08:45 AM
Do you have the same behaviour for the 38 late??? by insync i ment running at the same power.

Ok i had started the engine 1 , let it come across its startup and when it run idle, i started number 2. now after one minute i selected both engine and throttled up, trim for horizontal and cruising to batllezone, on my way i noticed the rolling, 97% or 70% it didnt matter.
sofar me (on two different pc's, dif joysticks) and someone else have noticed it.

anyone else????

02-26-2006, 10:13 AM
I have had it do that before...I think, for me, it was stick related...when I hit "refly" it continued doing it...but when I shut my machine down it did not.

I suspect it is closely related with the "wobbles"...I notice an aweful lot of X52 users have these sorts of problems...the stick I currently fly too.

02-26-2006, 10:20 AM

I dont think its joystick related, it started with 404m one pc (online machine) has a gravis phoenix joystick, my other pc(just for testing things and EAW) has a X52.
Well i dont think it bothers much, but i thought the 38 has no torque, but maybe she has a very litle torque now.


02-26-2006, 10:49 AM
I have no such problems. My 38 goes straight with a margin smaller than half a tick aileron trim. If it rolls, it may roll left or right.

Have you checked the weather? Coriolus effect? Weight distribution? Drag distribution?

There are a lot of possiblities that have nothing to do with engine torque. I find it funny that so many people claim a P-38 should never drop a wing...

02-26-2006, 01:28 PM
Hey CD,

For what its worth, Ive always needed/used 2 click left aileron trim with both the L and the J,none at all with the L-Late at least with my rig. This has been consistent back for several patches.

To synch the engines I do it like this;
rollthrottle and prop to 0 before I do anything, then
select L, start
Select R,start
Select left, roll throttle forward slightly then right back to 0 ditto for prop pitch,
(my throttle and prop are on wheels)
Select R, same as above.
Select all, set desired throttle and prop pitch.
then proceed normally.

It sounds complicated but it takes only couple of seconds. Dunno about other folks, but I fly this plane a lot and this method seems to work for me to get the engines perfectly synched from the get-go.


02-26-2006, 02:04 PM
Thx jettexas, i will try that, so i just throttlw up with one engine, then back to zero, let it comes to rest, then next engine the same procedure, then both and take off.

thx for info, like i said its no showstopper.