the climbing rate gauge should have HUGE variations caused by atmosphere

[jcenzano]

Originally Posted by raaaid

well but at least you agree with me that altitude needles in the game should oscilate and the climbing rate one a lot

pitot-static VVI´s do not oscilate a lot, but they have LAG and they are somehow sluggish.

Originally Posted by raaaid

if i were to build a climbing rate gauge i would do it base on vertical angle of heading and air speed

and can you tell me how would you build a VVI gauge based on these with WWII technology???

because to get a "highly acurate" verical angle of climb/descent you need an INS or a pretty good attitude indicator and they did not have neither of these back then

on the other hand your "inquietudes científicas" generate pretty interesting posts

As a pilot I can say I haven't really noticed any wobbly oscillations of a VSI ... ever. Atmospheric pressure variances do not occur with the great horizontal or vertical rapidity that would be required to make it do so. Remember, it's just a bourdon tube with a calibrated leak.

[gabuzomeu]

By the way, the same scientific maffia introduced gyro scop driven artificial horizon, while a glass of water is a good reference for horizontal in daily experience...

[janpitor]

Originally Posted by gabuzomeu

By the way, the same scientific maffia introduced gyro scop driven artificial horizon, while a glass of water is a good reference for horizontal in daily experience...

Try the glass of water in a turn and you will see why this principle is not used

[raaaid]

Originally Posted by janpitor

Try the glass of water in a turn and you will see why this principle is not used

neither the gyro work on this conditions due to precesion

well i admit i was wrong if it works dont cahnge it though find it surprising, i guess they dont oscilate to the price of precision

[5./JG27.Farber]

Just totally ignore me...

I guess you guys were not there.........................................


mazex - what about that radar / command fighter thing your too busy to work on? any news?

[IvanK]

Why Water couldn't be used a Bob Hoover classic:

[SQB]

Originally Posted by IvanK

Why Water couldn't be used a Bob Hoover classic:

(video here)

Dangit, you beat me to it! This video demonstrates that non-aerodynamic (simple relative mass * gravity systems) do not give correct readings of attitude and roll. Precession, while annoying for sure, is *extremely* minor when compared to this. Gyroscopes can be re-centred using balance magnets, negating the effects of precession anyway.

To answer Raaaids initial question, I ask you "how would you, using as simple a device as possible, figure out what components of any vertical incoming air is wind (which can be much faster than 20km/h (~5ms^-1) at higher altitudes) and what is the climbing rate." Remember that in normal flight (i.e. when you are actually looking at the climbing rate gague) you climb or descend at ~2-5 thousand feet per minute which is ~25.5ms^-1, not too different from your conservative estimation of wind.


Also, using a pressure based system, pressure changes by ~33hPa per thousand feet, whereas the most brutal low fronts will change pressure by 10-15hPa over the course of several hours. Small variations in pressure at ground level have surprisingly large effects, so it's easy to forget that by climbing in an a/c you travel through a huge range of pressures.

[raaaid]

well you make a mechanism that makes this calculation:

airspeed*cos pitch angle=climbing rate

if your going at 500kph and theres a vertical wind of 20 kph your making an error in just that your real speed will be the hipothenusa of the rect triangle: 20-500-x

so then your horizontal airspeed would be maybe 490 with which the error would be minimum

also planes have artificial horizonts to know your picth angle

edit:

doesnt actually a gyro artificial horizont also go crazy in hard manoubers?

[IvanK]

"doesnt actually a gyro artificial horizont also go crazy in hard manoubers?"

Depends on the gyro system. If its a full 360 degree in pitch and roll it works just fine no matter what you do. Few if any in WWII would have had this capability though.