Great video. A concept that is not clear, at least to me, is what impact does speed brakes have, explained by conservation of energy. I realize it increases drag, but after that please explain if you can. Thanks again for your videos
Excellent question. Speed brakes increase parasite drag, which for all intents and purposes, converts kinetic energy to thermal energy (just like how wheel brakes on a car heat up) and therefore energy is still conserved.
@@freepilotgroundschool2326 Since Kinetic Energy is lost, to pay for the drag, what happens to potential energy in this conservation of energy equation
@@frysimulation Potential energy remains constant if the altitude remains constant. The equation is a bit simplified. The equation should properly include thermal energy and nuclear energy as well, but thermal energy (from increasing drag) is somewhat negligible, and nuclear energy is completely negligible! As an aside, it's interesting to note that speed brakes are more ineffective than they may seem at first. In the jet aircraft that I have flown (CRJ & B737), the flaps and gear provide much more drag and thus higher rates of decent than the speed brakes. The speed brakes are only useful if you are far out and anticipate not needing the extra drag some time before landing.
@@freepilotgroundschool2326 I am trying to learn the 737-800 in XPLANE and when they get high on the profile many use speed brakes, which decreases speed, but if your too high you must reduce potential energy so I assume the computer must adjust something to reduce the height Thanks so much for your time.
@@frysimulation On the -800 if you're too high and you're still far from the airport, the best configuration is speed brakes to Flight detent and increase speed to Vmo/Mmo. Close to airport, slow to 250 KIAS (which you should be anyways below 10,000'), flaps 5, gear down, slow to below 200 KIAS and flaps 15. Descend just below 200 KIAS (the Flap 15 VFe). Once on profile, extend landing flaps (30 or 40). If you're still to high/fast at 1000' AAE, either conduct a Go Around or, if the airport isn't busy and it's VFR, do a visual 360 to lose some excess energy.
Chapter 4 in 20 mins!
The AFH! Haha.
Very good reason ❤
masterpiece mate, congrats
I appreciate this content, thanks.
Fantastic !
Thank you for your content!
ᴘʀᴏᴍᴏsᴍ
Great video. A concept that is not clear, at least to me, is what impact does speed brakes have, explained by conservation of energy. I realize it increases drag, but after that please explain if you can. Thanks again for your videos
Excellent question. Speed brakes increase parasite drag, which for all intents and purposes, converts kinetic energy to thermal energy (just like how wheel brakes on a car heat up) and therefore energy is still conserved.
@@freepilotgroundschool2326 Since Kinetic Energy is lost, to pay for the drag, what happens to potential energy in this conservation of energy equation
@@frysimulation Potential energy remains constant if the altitude remains constant. The equation is a bit simplified. The equation should properly include thermal energy and nuclear energy as well, but thermal energy (from increasing drag) is somewhat negligible, and nuclear energy is completely negligible!
As an aside, it's interesting to note that speed brakes are more ineffective than they may seem at first. In the jet aircraft that I have flown (CRJ & B737), the flaps and gear provide much more drag and thus higher rates of decent than the speed brakes. The speed brakes are only useful if you are far out and anticipate not needing the extra drag some time before landing.
@@freepilotgroundschool2326 I am trying to learn the 737-800 in XPLANE and when they get high on the profile many use speed brakes, which decreases speed, but if your too high you must reduce potential energy so I assume the computer must adjust something to reduce the height
Thanks so much for your time.
@@frysimulation On the -800 if you're too high and you're still far from the airport, the best configuration is speed brakes to Flight detent and increase speed to Vmo/Mmo. Close to airport, slow to 250 KIAS (which you should be anyways below 10,000'), flaps 5, gear down, slow to below 200 KIAS and flaps 15. Descend just below 200 KIAS (the Flap 15 VFe). Once on profile, extend landing flaps (30 or 40). If you're still to high/fast at 1000' AAE, either conduct a Go Around or, if the airport isn't busy and it's VFR, do a visual 360 to lose some excess energy.