Pyro, could you look at the Yak-9U Pitch Trim?

[Vermillion]

Pyro, could you please take a look at the Yak-9U Pitch Trim in the FM?

After flying the Yak-9U in the "Check Six" event on Saturday, it reminded me of a problem with the Yak that has bothered me since its introduction.

Whenever you try to dive with this aircraft, you must constantly feed in large amounts of nose down trim just to keep it from going into what amounts to a "auto climb".

Now, I understand that when you dive the lift increases, which naturally tends to bring the nose up.

I see this somewhat in other aircraft, but its greatly magnified in the Yak-9U. In fact its so bad, that it tends to negate the Yak's acceleration advantage when you are trying to dive away, because the nose keeps coming up (even when I am feeding in constant nose down trim) and scrubbing off speed.

Lately I have been flying alot of different aircraft, and none of the others have this problem, so I know its not a joystick/control problem.

It goes beyond a "quirk" in the aircraft handling, to the point that it feels to me like a bug.

Anyone else?

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Vermillion
**MOL**, Men of Leisure
"Real Men fly Radials, Nancy Boys fly Spitfires"

[RAM]

In a power dive, Fw190A has just the same problem, if accelerates 200mph the plane tucks the nose up so much that with full stick down you cant compensate, needing a lot of trim.

I didnt expect this from a plane so stable at all speeds as 190A was.

BUt I can live with it...simply mapped elevator trim into my hat, and problem solved  

[Vermillion]

RAM try out the Yak-9U (try the 190, then try the Yak), its much worse in my opinon.

I admitt its there in all aircraft, but its downright obscene in the Yak.

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Vermillion
**MOL**, Men of Leisure
"Real Men fly Radials, Nancy Boys fly Spitfires"

[funked]

Read what the AFDU had to say about Fw 190 pitch trim in dives: http://www.geocities.com/spades53.geo/pro_190_survey_a_4.jpg
 

The maximum speed so far obtained in a dive is 580 m.p.h. True at 16,000 ft. and at this speed the controls, although slightly heavier, are still remarkably light.  One very good feature is that no alteration of trim from level flight is required either during the entry or during the pull-out.

[RAM]

Then bassically something is not right here. Fw190A pulls up REALLY hard over 400IAS, and with a HEAVY tendence to roll towards right.

Requires really big ammouts of elevator trim to counter this, and quite a bit of aileron trim.

Plus, over 400IAS 190's rollrate is  slower than I thought it should be. In fact at those speeds a P38 rolls faster, and a F4U outrolls a 190 by a bit.


[This message has been edited by RAM (edited 08-21-2000).]

[Vermillion]

RAM please don't hijack the thread to 190's.

One thing I have to point out about the Yak, I am not talking about the nose lifting over 400IAS.

On the Yak, you enter a shallow dive from a level speed of 200IAS, and you will have to input large amounts of nose down trim the entire way.

In fact, you can't get to 400 IAS in this bird without nose down trim or full negative pitch on the joystick.

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Vermillion
**MOL**, Men of Leisure
"Real Men fly Radials, Nancy Boys fly Spitfires"

[RAM]

 

Originally posted by Vermillion:
RAM please don't hijack the thread to 190's.

Isnt my intention. You started a thread on a perceived bug on Yak9, then I remark that a similar thing happens in Fw190A.

I really dont think that this is hijacking anything, buy only adding my input on what seems a problem that happens on more than 1 plane,maybe in other planes is not is as serious problem as in Yak9, but still something to talk about.

Anyway as I told before this isn't intended t obe a rant about 190. I said clearly that "i can live with it".

[This message has been edited by RAM (edited 08-21-2000).]

[funked]

One thing to keep in mind before we get too excited:

Some of the discussions that may have inspired the upcoming FM change were related to drag and lift (downforce) from the horizontal stabilizer.  If changes are made in this area it would most definitely effect pitch trim.

[Citabria]

 

RAM-
Plus, over 400IAS 190's rollrate is slower than I thought it should be. In fact at those speeds a P38 rolls faster, and a F4U outrolls a 190 by a bit.

RAM is taking this thread to Cuba

[funked]

LOL Citabria!

The P-38L has hydraulic assist for the ailerons and the F4U has aerodynamic assist (balance tabs).  Fw 190 has neither of these aids so I would expect aileron deflections to be reduced at extremely high speeds.

[Sorrow[S=A]]

Verm- something else thats bugged me about trim in the Yak-

The plane has an extremely low stall speed (especially vertically)and such exceptional control....  yet the yaw trim causes exceptionally fast slip with minor speed changes. A plane that is so incredibly stable and with such a large rudder and rudder authority feels.. ODD to need so much trim to keep from starting into a slip.
 So yes- Pitch trim and Yaw trim have both felt odd to me for a long time in this plane.
Either tend to scrub off airspeed and acceleration so fast the plane can barely perform unless you know to expect it.

[RAM]

 

Originally posted by Citabria:

RAM is taking this thread to Cuba

Really, this guy is an idiot. Knew it a while ago but now I am really sure.

[Jigster]

 

Originally posted by Citabria:

RAM is taking this thread to Cuba

ROFLMAO!!!!!(tm)

I get that right?

- Dweeb