Basic Aeronautical Knowledge questions
Thread Starter
If a normally aspirated engine is set LOP in the cruise and the aircraft to which it is fitted is then put into a descent, the power output of the engine will ...
And yes, RPM is very useful.
And then there's this thing called 'pitch trim'.
As to your other points, 43, stay tuned for my next BAK thread.
And yes, RPM is very useful.
And then there's this thing called 'pitch trim'.
As to your other points, 43, stay tuned for my next BAK thread.
You are still entering the descent with x amount of power, but now the mysteries of gravity pulling you down, yes I know adding more air to already LOP charge will result in less power, but enough less power to offset the pull of granitus?
But the other point still stands, I assume you still look at the IAS pointer to make sure it doesn't bend past the red bits.
But the other point still stands, I assume you still look at the IAS pointer to make sure it doesn't bend past the red bits.
Originally Posted by Clinton McKenzie
I'll be starting another BAK thread on altitudes and area forecast margins of error and instrument margins of error and...
Originally Posted by Clinton McKenzie
You obviously haven't been prosecuted for exceeding the VNE of an aircraft you've flown, Cedrik, on the basis of 'evidence' comprising the forecast winds and the aircraft's ground speed. This will all make sense, eventually...
made on 1st of April. It wasnt…obviously:
Use the E6B or similar to calculate TAS from
your values. The OAT has a very big impact on the TAS from the OAS readout.
There is some online calcs, but before you use them to defend yourself you should check thet they do the math correct.
Jere is one example:
TAS Calculator
It is obvious that someone that use a GS readout to prosecute people for VNE/VMO/MMO violations do not understand aviation at all.
The OP's first post asks why didn't the wings break off at a ground speed of 239 kts. The only thing affecting a light aircraft structure is the IAS. The groundspeed is the speed of your aircraft flying along plus whatever speed the airmass is moving at, referenced to a fixed point on the ground, it is not the speed of the air passing over your wings ! Only the IAS shows your actual speed through the air molecules, and that is all the aircraft structure can 'feel'.
As long as your max allowable IAS was not exceeded, you have no case to answer. I have a photo from an A321 with a TAS of 465 kts and a ground speed of 600 kts giving a tailwind of 135 kts - it is in the wrong format to post here. Admittedly, that was a jet stream up at FL380 or so, but tail winds of more than 72 or 43 kts are not uncommon.
You cannot work out what an aircraft's IAS was from a groundspeed readout after the event, because you need to know the aircraft's TAS, so need to know the air density and temperature up there where the aircraft was at the time, as well as an accurate windspeed of the airmass you were in. None of this can be known from the ground.
As long as your max allowable IAS was not exceeded, you have no case to answer. I have a photo from an A321 with a TAS of 465 kts and a ground speed of 600 kts giving a tailwind of 135 kts - it is in the wrong format to post here. Admittedly, that was a jet stream up at FL380 or so, but tail winds of more than 72 or 43 kts are not uncommon.
You cannot work out what an aircraft's IAS was from a groundspeed readout after the event, because you need to know the aircraft's TAS, so need to know the air density and temperature up there where the aircraft was at the time, as well as an accurate windspeed of the airmass you were in. None of this can be known from the ground.
Could you be persuaded not to? At the very least, it comes across as very imperious to say the least, rather too 'know it all'
OP, you keep going on about BAK as if your questions are a regular problem that those sitting the RPL exams have to solve. Have you actually read the BAK syllabus in Part 61 MOS?
What's the point of this thread? Serious question, not having a go!
What's the point of this thread? Serious question, not having a go!
Originally Posted by Uplinker
You cannot work out what an aircraft's IAS was from a groundspeed readout after the event, because you need to know the aircraft's TAS, so need to know the air density and temperature up there where the aircraft was at the time, as well as an accurate windspeed of the airmass you were in. None of this can be known from the ground.
Only suggesting it might because FlightRadar24 has a field for IAS but I'm too poor to afford gold membership and see it unlocked!
Thread Starter
Originally Posted by clark y
Clinton,
Would I be correct to assume that this thread has to be read in conjunction with your other thread?
Would I be correct to assume that this thread has to be read in conjunction with your other thread?
ipvapproach: 1986, and have walked away from every landing since.
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VNE has nothing to do with GS.
If you descend at a constant IAS, in ISA atmosphere, your TAS (equal to GS without wind) will gradually decrease.
Up or down 600ft is approximately 1% supplementary difference between IAS and TAS. 9000ft will be about 15%, so VNE at FL90 will be about 225 kt, and I don't know your cruising speed but a very low tailwind would be enough to get this GS.
Very nice airplane the Bonanza !
If you descend at a constant IAS, in ISA atmosphere, your TAS (equal to GS without wind) will gradually decrease.
Up or down 600ft is approximately 1% supplementary difference between IAS and TAS. 9000ft will be about 15%, so VNE at FL90 will be about 225 kt, and I don't know your cruising speed but a very low tailwind would be enough to get this GS.
Very nice airplane the Bonanza !
Thread Starter
Originally Posted by mikewil
Does ADSB not provide IAS?
Only suggesting it might because FlightRadar24 has a field for IAS but I'm too poor to afford gold membership and see it unlocked!
Only suggesting it might because FlightRadar24 has a field for IAS but I'm too poor to afford gold membership and see it unlocked!
For aircraft fitted with a 'steam driven' i.e. purely mechanical ASI, there's no source of digitised ASI data. More 'modern' ASIs and EFIS systems? Yes.
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Escape velocity. I don't get it.
Why do you need to travel at 10,000 mph to "break" the tie with Earth's gravity?
If there was a ladder that extended 100 miles would you have to climb it at 10000mph?
Isn't it just the distance from Earth that matters, Earth's gravity fades, why do we need to cover the distance at speed?
An aircraft can pull itself away from earth surface ( where gravity is strongest) with compatibly little energy, it can almost fly straight up, so, if there was an atmosphere could it potter along at 1000ft a minute into space?
Mjb
Why do you need to travel at 10,000 mph to "break" the tie with Earth's gravity?
If there was a ladder that extended 100 miles would you have to climb it at 10000mph?
Isn't it just the distance from Earth that matters, Earth's gravity fades, why do we need to cover the distance at speed?
An aircraft can pull itself away from earth surface ( where gravity is strongest) with compatibly little energy, it can almost fly straight up, so, if there was an atmosphere could it potter along at 1000ft a minute into space?
Mjb
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It's the speed required for an unpropelled object, e.g. launched from the ground without additional thrust after launch. Step off your ladder at height and you'll soon find yourself rapidly descending, not ascending or hovering.
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Originally Posted by Clinton McKenzie
The point will eventually become clear (though I'm sure that many have already worked it out). I'm not testing my BAK.
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We are busy out here flying the line etc. Everyone is well over these old codgers splitting hairs to make themselves feel important.
