I don't understand how to calculate the drag coefficient
Physics Forums » Aerospace Engineering
by vinceguar24
3d ago
I'm confused about how to solve for the Cl. I know that the equation for lift is L = Cl * r * .5 * V^2 * A, and you need the Cl to find lift. However the equation for lift coefficient that I found is (2L)/(1/2*p*u^2*S) and you need L which is lift to solve for Cl. So i don't understand how in... Read more ..read more
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Formation of a Starting Vortex for Symmetric Aerofoils (NACA 0015)
Physics Forums » Aerospace Engineering
by JackFyre
2w ago
Greetings! An aerofoil experiences life because the velocity of flow at the top surface of the airfoil is higher, causing a pressure difference. This higher velocity is attained as a consequence of the conservation of angular momentum due to the formation of a starting vortex at the trailing... Read more ..read more
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What are the unique characteristics of a scramjet exhaust plume?
Physics Forums » Aerospace Engineering
by Flyboy
2w ago
Got a bit of a headscratcher for y'all. What would the exhaust plume from a scramjet look like? Using the X-43 as an example because it's a well documented design. I've found some stuff that seems to point towards looking like a mildly underexpanded rocket exhaust, but it's only a few images... Read more ..read more
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What's the Next Step for NASA's Ingenuity Helicopter After Mission Ends on Mars?
Physics Forums » Aerospace Engineering
by berkeman
2w ago
https://www.cnn.com/2024/01/25/world/nasa-mars-ingenuity-helicopter-mission-ends-scn/index.html CNN After completing 72 historic flights on Mars over three years, NASA’s Ingenuity helicopter mission has ended. Originally designed as an experiment... Read more ..read more
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Centrifugal Compressor: Absolute Velocity Calculation
Physics Forums » Aerospace Engineering
by MysticDream
3w ago
How can I calculate the absolute velocity of air at the outlet of a centrifugal compressor if I have: Diameter of impeller RPM Slip factor I've been reading for weeks and cannot seem to find the answer to this question. For anyone who is familiar with the subject, I'm sure you know about the... Read more ..read more
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What was the strange aircraft I heard at the dock?
Physics Forums » Aerospace Engineering
by DaveC426913
1M ago
The other day I was down at the dock and I heard an aircraft coming up from behind. I didn't look up right away but it caught my ear because commercial jets don't fly that way (westward, from the small island airport). I looked up as it passed over, a thousand feet up or so, expecting a 707 or... Read more ..read more
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How Can I Maximize My Radio's Power for Moonbounce Communication?
Physics Forums » Aerospace Engineering
by proteo
1M ago
Hi! I am an amateur radio operator. How many watts should my radio's power be to bounce signals off the Moon ..read more
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Is the Dual-Stage 4 Grid Ion Drive the Key to Faster Space Travel?
Physics Forums » Aerospace Engineering
by darkdave3000
1M ago
My post was removed originally about a designed based on this new engine. I don't know what specific forum rule I broke, I read the entire thing. But I am posting a new threat to ask about the validity of this specific technology. I am asking because there seems to be zero media coverage of it... Read more ..read more
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RIP Ingenuity 2021-2024
Physics Forums » Aerospace Engineering
by berkeman
1M ago
https://www.cnn.com/2024/01/25/world/nasa-mars-ingenuity-helicopter-mission-ends-scn/index.html CNN After completing 72 historic flights on Mars over three years, NASA’s Ingenuity helicopter mission has ended. Originally designed as an experiment... Read more ..read more
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New High Power British LASER
Physics Forums » Aerospace Engineering
by Tom.G
1M ago
New British LASER is one heck of an anti-aircraft gun! LIGHT-SAVER Britain blows up drones with £140m LASER dubbed ‘DragonFire’ in incredible first – with each shot costing just a tenner​The futuristic laser can destroy a target from miles away with pin point accuracy... The highly... Read more ..read more
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