Board index Other Hangar talk Real aviation

Interesting Videos

The "real" thing.
Forum rules
Please refrain from discussing politics.

Re: Interesting Videos

Postby Johan G » Wed Jul 08, 2015 5:33 pm

The time to altitude climb records set by the modified McDonnell Douglas F-15A "Streak Eagle".

F 15 Streak Eagle Record Flights (15 min)


A presentation and discussion about the Streak Eagle with some of the people who was involved back then (see also this page).
40th Anniversary: F-15 'Streak Eagle' Flights (37 min. You might want to skip to 11:17 min. There are some issues with the filming).



Then there is also this interesting post by "vessbot" in the Something Awful forums, that explains the seemingly odd and arbitrary maneuvers very well, and another post discussing the modifications to the aircraft.


Some technical references related to flight testing for and developing of optimum climb profiles (sometimes mentioned as "Rutowski climb profiles") for those so inclined:
Low-level flying — It's all fun and games till someone looses an engine. (Paraphrased from a YouTube video)
Improving the Dassault Mirage F1 (Wiki, Forum, GitLab. Work in slow progress)
Johan G
Moderator
 
Posts: 5546
Joined: Fri Aug 06, 2010 5:33 pm
Location: Sweden
Callsign: SE-JG
IRC name: Johan_G
Version: 3.0.0
OS: Windows 7, 32 bit

Re: Interesting Videos

Postby Johan G » Mon Jul 13, 2015 11:08 pm

Moved an amazing landing and take off, and a comment, to the topic Accidents and Incidents / Amazing Landings & Take Offs. :wink:
Low-level flying — It's all fun and games till someone looses an engine. (Paraphrased from a YouTube video)
Improving the Dassault Mirage F1 (Wiki, Forum, GitLab. Work in slow progress)
Johan G
Moderator
 
Posts: 5546
Joined: Fri Aug 06, 2010 5:33 pm
Location: Sweden
Callsign: SE-JG
IRC name: Johan_G
Version: 3.0.0
OS: Windows 7, 32 bit

Re: Interesting Videos

Postby HJ1AN » Tue Jul 14, 2015 4:34 am



Watch air traffic over London!
User avatar
HJ1AN
 
Posts: 377
Joined: Sat Jul 25, 2009 4:45 am
Callsign: HJ888
Version: 3.4
OS: OS X

Re: Interesting Videos

Postby Johan G » Thu Aug 06, 2015 2:46 pm

Density altitude and why it matters.

In short, higher temperatures will cause a higher density altitude, which will make the air behave as if your aircraft was at a (sometimes much) higher pressure altitude. This will degrade the performance in many ways. You will have less lift, less efficient propellers and less efficient combustion and in addition to that you will also have a higher stall speed.

This is dangerous in particular at afternoon take offs on hot days from high elevation airports or if you have to make tight maneuvers in those circumstances.





"With this plane, we can fly anywhere we want to." :roll:
Low-level flying — It's all fun and games till someone looses an engine. (Paraphrased from a YouTube video)
Improving the Dassault Mirage F1 (Wiki, Forum, GitLab. Work in slow progress)
Johan G
Moderator
 
Posts: 5546
Joined: Fri Aug 06, 2010 5:33 pm
Location: Sweden
Callsign: SE-JG
IRC name: Johan_G
Version: 3.0.0
OS: Windows 7, 32 bit

Re: Interesting Videos

Postby HJ1AN » Tue Aug 18, 2015 12:59 am

Crash-testing a 727.



Full documentary:


I found it odd that they mentioned it is the largest radio-controlled airplane ever, and fact checked, when in fact NASA did the same thing with a 707 (which I assume is just as large if not larger than a 727?)
User avatar
HJ1AN
 
Posts: 377
Joined: Sat Jul 25, 2009 4:45 am
Callsign: HJ888
Version: 3.4
OS: OS X

Re: Interesting Videos

Postby legoboyvdlp » Tue Aug 18, 2015 2:47 am

The 727 apparently is just a 707 with 3 engines according to my research essay!
Obviously there were many changes but in essense it shares the cross section and cockpit.
User avatar
legoboyvdlp
 
Posts: 7183
Joined: Sat Jul 26, 2014 1:28 am
Callsign: YV-LEGO
Version: next
OS: Windows 10 HP

Re: Interesting Videos

Postby HJ1AN » Tue Aug 18, 2015 3:08 am

Yes it is. As is with the 737, and the 757 uses the same fuselage cross section. However, the question would be this - is the 707 smaller than the 727? Then if so they mentioned it as the largest radio controlled plane would have some merit.

Let's be specific:

727 wingspan - from wikipedia - 108 ft
707 wingspan - also from wikpedia - 130 to 145ft (depending on model)

727 length - (wiki) 133ft - 153ft
707 length - (wiki) 144ft - 152ft (depending on model)

Seems like the 707 is larger overall even if you consider the oldest models, and I have no idea what this 727 is, but if it's sitting around waiting to rot anyway it's probably one of the earliest ones too. Assuming this, it still makes the NASA 707 the largest remotely controlled plane...
User avatar
HJ1AN
 
Posts: 377
Joined: Sat Jul 25, 2009 4:45 am
Callsign: HJ888
Version: 3.4
OS: OS X

Re: Interesting Videos

Postby HJ1AN » Tue Aug 18, 2015 3:12 am

Oh. the NASA plane is actually a 720.

Still,
Wingspan 130 ft 10 in (39.90 m)
Length 136 ft 2 in (41.25 m)
User avatar
HJ1AN
 
Posts: 377
Joined: Sat Jul 25, 2009 4:45 am
Callsign: HJ888
Version: 3.4
OS: OS X

Re: Interesting Videos

Postby IAHM-COL » Tue Aug 18, 2015 3:32 am

Now that's a livery waiting to be made :D
If we gave everybody in the World free software today, but we failed to teach them about the four freedoms, five years from now, would they still have it? Probably not, because if they don’t recognise their freedoms, they’ll let their freedoms fall
User avatar
IAHM-COL
Retired
 
Posts: 4064
Joined: Wed Aug 08, 2012 5:40 pm
Location: Homey, NV (KXTA) - U.S.A
Callsign: HK-424D or ICAO4243
Version: 3.7-git
OS: Linux

Re: Interesting Videos

Postby pommesschranke » Tue Aug 18, 2015 4:25 pm

only 50m range ?
with the same RC remote I get 500m or more.
pommesschranke
 
Posts: 1104
Joined: Sat Apr 27, 2013 7:58 pm
Location: EDLM & LJCE
Callsign: d-laser
IRC name: laserman
Version: git
OS: Linux Lubuntu 18.04

Re: Interesting Videos

Postby Johan G » Wed Aug 19, 2015 12:06 am

Someone mentioned something I had not heard of before, the falling leaf stall, over here. Below is an illustration of that from a linked blog post. (It is also a good illustration of using rudder for roll control while in high angles of attack.)



Speaking of the falling leaf stall, I guess that is related to the F/A-18 Hornet's "Falling Leaf" -mode


A rather too close call (look at that altitude loss :? )



For something slightly different, I think many of us here already know a pilots job is a lot more than just "kicking the tires and lighting the fires", but just in case. ;)
Low-level flying — It's all fun and games till someone looses an engine. (Paraphrased from a YouTube video)
Improving the Dassault Mirage F1 (Wiki, Forum, GitLab. Work in slow progress)
Johan G
Moderator
 
Posts: 5546
Joined: Fri Aug 06, 2010 5:33 pm
Location: Sweden
Callsign: SE-JG
IRC name: Johan_G
Version: 3.0.0
OS: Windows 7, 32 bit

Re: Interesting Videos

Postby HJ1AN » Wed Aug 19, 2015 12:28 am

I never knew about that of the F-18 hornet. I thought the F-18 hornet simulators were pretty accurate back in the days I played them (stall, stall... "ok.." *recovers*) :roll:


pommesschranke wrote in Tue Aug 18, 2015 4:25 pm:only 50m range ?
with the same RC remote I get 500m or more.


I don't know much about RC remotes, but 500m seems impressive. Also I suspect it may have to do with the receivers being inside of a speeding round tube, and not wanting to hack up said round tube to slot a bigger receiver in order not to distort impact data.... just a guess..

Although, I haven't watch the NASA video, didn't they RC'ed the whole from thing from the ground(and in 1984 some more)? I'll check on that later (currently at work).
User avatar
HJ1AN
 
Posts: 377
Joined: Sat Jul 25, 2009 4:45 am
Callsign: HJ888
Version: 3.4
OS: OS X

Re: Interesting Videos

Postby Johan G » Wed Aug 26, 2015 8:23 am

Something for the ones who likes Italian aircraft: 25 minutes of air show footage. :D

  • FIAT G.91: Group engine start, taxi, take off, formations, landing, taxi and engine stop.
  • Glider: Solo acrobatics
  • AMX International AMX: Solo take off, acrobatics, landing, taxi and engine stop
  • Frecce Tricolori: Group take off, impressive large group formation acrobatics and landing.

Low-level flying — It's all fun and games till someone looses an engine. (Paraphrased from a YouTube video)
Improving the Dassault Mirage F1 (Wiki, Forum, GitLab. Work in slow progress)
Johan G
Moderator
 
Posts: 5546
Joined: Fri Aug 06, 2010 5:33 pm
Location: Sweden
Callsign: SE-JG
IRC name: Johan_G
Version: 3.0.0
OS: Windows 7, 32 bit

Re: Interesting Videos

Postby Martien van der P. » Mon Sep 07, 2015 6:05 pm

Two old promo video's from two amazing aircraft:

The Lockheed L-188 Electra


The MBB BO 105 (vid in german)

(At 1:40 you could see how BO 105 response to the controlls)
User avatar
Martien van der P.
 
Posts: 323
Joined: Fri Dec 14, 2012 4:09 pm
Location: The Netherlands
Callsign: MV-DP
Version: 2018.3.2
OS: Windows 7

Re: Interesting Videos

Postby Johan G » Sat Sep 19, 2015 3:08 pm

Found this gem explaining a lot about the Pratt & Whitney J58 turbo(ram)jet engines of the Lockheed SR-71 Blackbird. I was unaware of most of them.



Only thing that bothers me is that I have not seen normal shockwaves been called normals before. There may be some confusion between normal and oblique shockwaves as well, though my knowledge in that area is rather small.

Anyway, that channel seems worth looking into.

Here is a photo of a bare engine:
Image
Pratt & Whitney J58 (CC BY-SA 2.0), by Greg Goebel, from Wikimedia Commons

Edit:
This video with former SR-71 pilot Richard Graham probably is a good complement to the above video:
Low-level flying — It's all fun and games till someone looses an engine. (Paraphrased from a YouTube video)
Improving the Dassault Mirage F1 (Wiki, Forum, GitLab. Work in slow progress)
Johan G
Moderator
 
Posts: 5546
Joined: Fri Aug 06, 2010 5:33 pm
Location: Sweden
Callsign: SE-JG
IRC name: Johan_G
Version: 3.0.0
OS: Windows 7, 32 bit

PreviousNext

Return to Real aviation

Who is online

Users browsing this forum: No registered users and 0 guests