That would only make sense, if the Vne is given in IAS
That would only make sense, if the Vne is given in IAS
(VNE is definitely ias as it’s the redline on the speed indicator which measures indicated airspeed , military ones also convert this to mach numbers as speed gets close to mach as mach is based on density altitude as well as true airspeed
MI know what the redline on my airspeed indicator means and I also know that only applies to standard atmospheric conditions. The higher I go the more math is involved to figure out what my current IAS should read to keep from exceeding VNE. Many planes have a placard to remind pilots to take density altitude into account for this reason
MI think this might? answer your initial question https://aviation.stackexchange.com/questions/79284/how-can-the-cruise-speed-be-larger-than-vne
Aviation Stack Exchange
I recently read the POH for a M20V, the advertising for this aircraft states that the top speed is 242 KIAS. The POH gives the Vne at 196/195 KCAL/KIAS.
I have found a similar discrepancy, the Vl3 ...
I have found a similar discrepancy, the Vl3 ...
MThis being a complicated subject, there are probably a few right ansers because ac are so different from one to the next.
HYeah. it dawns on me. What is so irritating to me is, that it is stated that the Vne needs to reduce with altitude. Which is exactly what IAS does inherently, but the key seems to be that Vne decreases more than IAS and therefore the Vne(ias) has to decrease even more than that……
my head is starting to hurt…..
my head is starting to hurt…..
BV speeds are aways given in KIAS aka indicated. Cruise speed is not a "V" speed per se and will often be expressed in Indicated or True depending on its intended use. You fly Indicated airspeed but you flight plan with true airspeed. If you look at the power charts for the King Air you will see torque, rpm, fuel flow, KIAS and KTAS for different pressure altitudes and temperatures. Now how VNE is determined depends on how the aircraft is certificated as high altitude and high airspeed aircraft use different formulas to determine it. This can lead to some strange results. Take the Duke and the turbine Duke for example. The VNE on the Turbine Duke is lower than the Piston Duke since it flies higher and was certificated under different standards requiring a different formula for VNE determination. essentially once you get over 25k VMO/MMO become dominate. I read the exact details how this is done a long time ago but cannot find the reference
AI have never heard of Vne being dependent on altitude/TAS. It is a structural speed that depends on IAS. Your airplane will only be affected by the TAS when getting close to Mach 1, where the air stops being compressible. I don't think flutter characteristics change significantly with TAS/Altitude to warrant a different Vne. What is coffins corner is where you can't go faster in an airliner due to mach buffet , but can't go slower due to your AOA, minimum stall speed. That's where any turbulence will force you to dive down, which is not a good thing
AThe cruise speeds are in TAS to advertise how fast you can get from A to B in an aircraft. This is confusing, because your optimum IAS when flying the thing will be lower.
B"I don't think flutter characteristics change significantly with TAS/Altitude to warrant a different Vne" .. It depends on the type of aircraft and how its certificated. for most light GA its essentially not an issue. BUT even a light GA aircraft that is Turbo-normalized that equation changes. For example a SR-22t can operate up to FL250. It has a fixed VNE (205KIAS) up to 17500 and a linearly decreasing one that is reduced to 175KIAS at FL250. This isnt a direct result of structural loads but is a result of reduced flutter/aeroelastic margin due to higher TAS at a given indicated airspeed in the flight levels.
MThe only reason it’s not an issue with most light (powered) ga is their engines service ceiling are too low to matter. In gliders it’s a serious consideration though for high altitude/wave flying where you can get to fl400 and beyond. Perlman 1’s (Perlman Project, high alt glider research) coffin corner is about 60k ft as it’s just a modified DG505m. Perlman 2 which is purpose built for this can safely reach fl900, higher than the U2.
MThe convergence of flutter speed based on tas and the stall speed in ias is what defines both of their envelopes
VV speeds are in IAS, but at higher altitudes there are often speeds that are TAS limited (often due to flutter or mach effects). For example, even in my LS6 glider, Vne decreases with altitude, and this is shown on the airspeed indicator with several red lines below the Vne mark, with an altitude next to it.
HThanks y’all. I think I got it now! 
VIf you zoom in, you can see that at 19700', Vne is down to 118 KIAS. Trust me, an LS6 can hit 118 KIAS easily cruising under a western clould street - BTDT over the Grand Canyon at 17999' a few times. So you have to keep that in mind when blasting along fat, dumb, and happy; because if you get sucked into a Cu, getting out by diving may not be an option, and opening the spoilers at VNE is not a really good idea...and without gyros, well, you know what happens next.
HI guess operating at the edge of the envelope is always risky business
VFor those of you not familiar with racing gliders - you can get to redline with an easy push on the stick and about a 5 degree dive for less than a thousand feet. Back when low passes were common, a normal pattern was a wormburning Vne pass across the field dumping water ballast then pitching up to a closed pattern. Or sometimes a second Vne pass...not that I would EVER do anything that fun
V
VDifferent subject: has anyone use their Rhino with AFS 4?
Bmy Rhino was just delivered!!!
Bits a tricky subject that is overtly colored by ones [often limited] experiences. Even in most pilot forums talking about VNE triggers a ton of discord
ALS6 is nice. But I fly gliders too, never seen a speedo with more than one Vne on it.
Bive been meaning to get my glider rating for years. I live within an hour of two glider ports, i should finally give it a go
Acertainly, it is much more satisfying to stay up there by skill rather than by fuel. In europe, gliding tends to be cheaper than powered flying due to winch launching and clubs sharing the investment.
AAnd it will train natural stick and rudder skills, you'll fly planes like riding a bike.
Bi started in Utralights when i was a kid and moved to GA when i was 19.
MThat info is usually in the factory fight manual
M…as opposed to the panel
BIs there a template or cad for the general throw limiter dimensions that you used? Im thinking i will need one more custom than the 11 degree
Bthanks... Search for Throw limiter and nothing came up
RHe linked the correct thread. I’m installing a new limiter of 9,8 this week.
Byeah i already checked it out..need to make some measurements and then ill print one. I have the 11 to try first but im sure i want less aileron deflection than pitch
KAnyone interested in my Rhino Monstertech Mount plate? I upgraded to a sim rig so I don't need it anymore
1Hi all, I am pretty my question was already discussed somewhere but i have no idea how to find it. The question is: why does the stick stiffen under Gs and not under dynamic pressure (airspeed) in Il2GB? Does IL2 not provide speed as telemetry?
NIL2 does have dynamic spring as part of its FFB implementation. Thats about all it has. Theres a few haptic effects like gunfire and stall buffeting but they arent very well done.
TelemFFB adds a bunch of other types of effects, but the native support is what I wrote above.
TelemFFB adds a bunch of other types of effects, but the native support is what I wrote above.
SWhat TelemFFB settings are needed to enable stiffening of stick forces in roll axis as airspeed increases?
NTelemFFB doesn't play a role in the spring stiffness for IL2 (or DCS) since it has native control of the spring effect
1I dont understand your answer. When using telemffb il2 native ffb should be disabled. That means telemffb provides all effects.
1So is telemffb capable of providing stick forces based on airspeed for il2 and dcs?
Nwhere did you get this information?
1If you are referring to disabling native il2 ffb then i got it from rhino manual
Nno, it talks about disabling "Shake" only.
1What is "shake"?
NHaptic/Periodic effects. For IL2 native support that is limited to Buffeting, Runway Rumble and Weapons effects
NTo answer your original question. No, TelemFFB does not implement dynamic speed based spring for DCS/IL2 since the sims themselves do it.
1Thanks for answering, how do i disable shake?
NRight in the input settings where you would enable/disable FFB. There are two sliders. One for shaking, that controls the haptic feedback I previously mentioned. One for "feedback power" that is the master gain control for the dynamic spring based effects.
The only reason it is recommended to set the shaking value to 0 is that (in my opinion) the TelemFFB effects for Buffeting, Runway Rumble and Weapons Effects are just better than the built-in ones. This is what the Duplicate Shake Effects section in the manual is talking about.
If you enable the "IL2 Shake Master" setting in TelemFFB, you should disable the shake effects in IL2 so they are not both trying to play at the same time.
The only reason it is recommended to set the shaking value to 0 is that (in my opinion) the TelemFFB effects for Buffeting, Runway Rumble and Weapons Effects are just better than the built-in ones. This is what the Duplicate Shake Effects section in the manual is talking about.
If you enable the "IL2 Shake Master" setting in TelemFFB, you should disable the shake effects in IL2 so they are not both trying to play at the same time.
1Many thanks now i understand!
一Is that on every aircraft or only on certain aircraft? Some WW2 aircraft have bobweight as a feeling device which stiffens the stick according to G. P-51 is one of them, not sure which model tho
1No its just that i didnt understand how to set it up.