Hello guys,
I'm self studying some aeronautical concepts and right now I'm struggling to understand some points on longitudinal static stability. In the online lectures I'm taking it is said the the downwash will reduce the angle of attack on the tail (horizontal stabilizer), I didn't quite get it since I thought that the fact the flow was being directed downwards by the main wing would actually increase the angle of attack on the tail. I went on wikipedia and it passes on the same information so I guess I'm missing something here and was hoping any of you could give me a hand.
Thank you in advance for any support.
Let's say I want to divert the flow away (reduce pressure) from something using the minimum frontal area, so no big shields. I think I should look for an airfoil with the biggest downwash possible. What are the characteristics I should look for maximize that effect? Multiple foils, high angle of attack, high lift profile, strong vortexes upstream..Any idea?
Sorry in advance if this is a dumb question, but I haven't seen this covered elsewhere.
I've just started taking glider lessons within the last two months, and have been working on my aerotow takeoffs and landings pretty religiously with Condor 2. Great sim, love it a whole bunch, with one exception:
Glider pilots familiar with aerotows know the focus spent on boxing the wake and otherwise staying out of the significant turbulence that the towing aircraft's prop creates. However, Condor doesn't seem to simulate the prop wake at all. I can fly directly behind the aircraft, a little below, a little above - nothing seems to result in the simulated turbulence and induced airspeed caused by real-life prop wake and downwash. Am I missing something? Or is this a setting I'm missing? Something they're hoping to add later? It seems like a pretty significant part of aerotowing that should be addressed by a simulator specifically for training glider pilots.
I really like the downwash from helicopters in Wildlands. The trees moving apart might have been a little bit overdone (made them look a little rubbery) but it was still cool!
It looks like downwash is gone all together.
This could be an optimisation decision, but I hope we see it back in a future patch.
I am a solar project developer and I've run into something totally out of my wheel-house. I'm designing a system for a hospital where the solar panels are relatively close to an active helipad. Our systems are required to be designed in a way that they can withstand 90 mph winds. I am concerned that air currents and turbulence created by landing helicopters may cause adverse interactions. From what I can tell rotorwash (downwash and outwash) velocities max out around 60mph. Other people use 10 psf as a dynamic load for rotorwash. I found these values in various FAA studies and memos dating back from 1985 to now. My feeling is that if I calculate dynamic load from the wind-speed (~20psf) and add the listed dynamic load (10psf) I should be alright.
I'm wondering
1- if these values are reasonable
2- how to calculate maximum pressure or windspeed that the system may encounter
3- what kind of engineer would sign off on this kind of calculation
My feeling is that if I calculate dynamic load from the wind-speed (~20psf) and add the listed dynamic load (10psf) from FAA I should be alright. That gets me 30psf of wind pressure correlating to approximately 110 mph. This is instead of 90mph+60mph which correlates to a wind pressure of 50psf.
Thanks in Advance
Howdy,
I'm wondering if anyone has or knows where I can find programs for visualizing downwash from a wing? I want to be able to input geometry, airfoil, and relative position to see the effects of downwash from a front wing on to a back wing. I have used STAR-CCM+ to look at the streamlines, but I want more programs to validate this information. I would develop this code myself, but my professor adviced against this since we are on a tight schedule. Does anyone happen to have one or know of any codes that I could use?
Actually I don't think a 2D Euler-steady model code would be what you use for this, but I can't think of any else that isn't CFD.
Also are there any other codes that are easily available to aerospace students and that are useful in design or analysis? I have looked at a list of programs on the Virginia tech website and I found a lot of them useful. I had also seen a program in the flying wing video a while back that chose an ideal geometry for given inputs, I thought this code was amazing and I was wondering if there were any like these available for free or if I would have to create my own.
I have created my own take-off program that determines take-off using calculated lift and drag values from XFLR5 or Star-CCM+, so if I can find a take-off model that can verify these results that would be great too.
Thank you for the help!
