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Ever Wonder How A A380-900 Would Look Like?  
User currently offlineOldeuropean From Germany, joined May 2005, 2091 posts, RR: 4
Posted (5 years 6 months 1 week 3 days 17 hours ago) and read 15732 times:

Here is a video of a 1:15 scale modell of an A380-900.

http://www.youtube.com/watch?v=ZdEpgtBP9bA

(advice: due to the annoying music, you maybe should turn off the audio Big grin )

Axel


Wer nichts weiss muss alles glauben
25 replies: All unread, showing first 25:
 
User currently offlineOldeuropean From Germany, joined May 2005, 2091 posts, RR: 4
Reply 1, posted (5 years 6 months 1 week 3 days 17 hours ago) and read 15714 times:

Here is another video of that modell

http://www.youtube.com/watch?v=v10g4COS-Xg



Wer nichts weiss muss alles glauben
User currently offlineFCA767 From United Kingdom, joined Nov 2006, 1786 posts, RR: 1
Reply 2, posted (5 years 6 months 1 week 3 days 17 hours ago) and read 15655 times:

ROFL at the Smiley face...At least he put effort into it Big grin That A380 flying like that would make me sick in the real plane...That's the thing with Remote Control planes...they aren't going to fly the same because of their small size compared to the air molecules...

Which has got me thinking about how the real aerodynamic testers test on small scale models for big planes as the plane will react different because it's smaller...


User currently offlineAerdingus From Ireland, joined Dec 2006, 2860 posts, RR: 15
Reply 3, posted (5 years 6 months 1 week 3 days 14 hours ago) and read 15281 times:

Ah it's really small!

Sorry couldnt resist with the stupid jokes, thanks for posting. Its a cool looking model but flies waaaay too fast!



Cabin crew blog http://dolefuldolegirl.blogspot.ie/
User currently offlineOA260 From Ireland, joined Nov 2006, 27308 posts, RR: 60
Reply 4, posted (5 years 6 months 1 week 3 days 13 hours ago) and read 15179 times:

I want one , where do you buy them lol...

User currently offlineThestooges From , joined Dec 1969, posts, RR:
Reply 5, posted (5 years 6 months 1 week 3 days 12 hours ago) and read 15040 times:

By the way how do those things fly anyway, are there little propellers in the engines or are they actually just realy small versions of jets ?!?!? Honestly, I have no idea  confused 

User currently offlineFlyingAY From Finland, joined Jun 2007, 713 posts, RR: 0
Reply 6, posted (5 years 6 months 1 week 3 days 12 hours ago) and read 14963 times:



Quoting Thestooges (Reply 5):
By the way how do those things fly anyway, are there little propellers in the engines or are they actually just realy small versions of jets ?!?!? Honestly, I have no idea confused

Those are actually real small-scale turbines. There are also so-called ducted fans used in RC planes, which are essentially a small propeller powered by a gas or electric motor inside the duct.


User currently offlineSgtusmc96 From United States of America, joined Apr 2007, 47 posts, RR: 0
Reply 7, posted (5 years 6 months 1 week 3 days 12 hours ago) and read 14941 times:

They are actually small turbine engines. There RPM is somewhere in the 150,000 range. They sound just the same also, just higher pitched.

User currently offlineMal787 From Australia, joined Jul 2007, 713 posts, RR: 0
Reply 8, posted (5 years 6 months 1 week 3 days 12 hours ago) and read 14862 times:

Thats the fastest I have ever seen an Airbus climb, maybe they should share the secret.

mal787



BN2 Metro, 402,404, Conquest, king air, 707,727.200, 732,733,734,735,736,738,757,762,763,742,743,744, MD11, DC9,Westwind
User currently offlineMadameConcorde From San Marino, joined Feb 2007, 10930 posts, RR: 37
Reply 9, posted (5 years 6 months 1 week 3 days 11 hours ago) and read 14821 times:



Quoting OA260 (Reply 4):

A wonderful big model!

I want one of these too!  airplane   cheerful 



There was a better way to fly it was called Concorde
User currently offlineLh526 From Germany, joined Aug 2000, 2381 posts, RR: 14
Reply 10, posted (5 years 6 months 1 week 3 days 11 hours ago) and read 14777 times:
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FORUM MODERATOR

1/4 (sic!) scale Embraer 145
http://www.erj145.de/



Trittst im Morgenrot daher, seh ich dich im Strahlenmeer ...
User currently offlineKappel From Suriname, joined Jul 2005, 3533 posts, RR: 17
Reply 11, posted (5 years 6 months 1 week 3 days 9 hours ago) and read 13898 times:

There are a couple of really cool video's about those big RC models. I liked the a380 video, but this one also caught my eye:

http://www.youtube.com/watch?v=KmKdA6L_MWk&NR=1

Miniature Enola Gay



L1011,733,734,73G,738,743,744,752,763,772,77W,DC855,DC863,DC930,DC950,MD11,MD88,306,319,320,321,343,346,ARJ85,CR7,E195
User currently offlineFCA767 From United Kingdom, joined Nov 2006, 1786 posts, RR: 1
Reply 12, posted (5 years 6 months 1 week 3 days 9 hours ago) and read 13727 times:



Quoting Lh526 (Reply 10):
1/4 (sic!) scale Embraer 145

How Much do they sell them for?  Smile


User currently offlineRB211TriStar From United States of America, joined May 2007, 185 posts, RR: 0
Reply 13, posted (5 years 6 months 1 week 3 days 9 hours ago) and read 13575 times:

That is some seriously cool stuff! I can appreciate the time it takes to build and the difficulty of flying such a large model.

I think I saw on the Youtube info window that he spent 22,000 Euro? I don't speak German, so someone should double check.

Imagine if that thing crashed into a crowd!? HOLY CRAP! I dig it though, especially the turbines!


User currently offlineFCA767 From United Kingdom, joined Nov 2006, 1786 posts, RR: 1
Reply 14, posted (5 years 6 months 1 week 3 days 8 hours ago) and read 12872 times:



Quoting RB211TriStar (Reply 13):
That is some seriously cool stuff! I can appreciate the time it takes to build and the difficulty of flying such a large model.

I think I saw on the Youtube info window that he spent 22,000 Euro? I don't speak German, so someone should double check.

Imagine if that thing crashed into a crowd!? HOLY CRAP! I dig it though, especially the turbines!

Woah! 22,000 Euro! I'd Rather get my CPL with that Big grin


User currently offlineLightsaber From United States of America, joined Jan 2005, 13529 posts, RR: 100
Reply 15, posted (5 years 6 months 1 week 3 days 8 hours ago) and read 12622 times:
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1st cool idea! I really would like to fly a model jet.  Wink

Quoting RB211TriStar (Reply 13):
Imagine if that thing crashed into a crowd!? HOLY CRAP! I dig it though, especially the turbines!

I've seen two large models crash (back when I did model airplane flying. It breaks the heart of the builder. You salvage the engine, radio parts, and as much as you can. But the model and so much work is gone. One due to the kit instructions not having the ailerons secured properly to the controls. On its maiden flight both controllers pulled out and with two ailerons suddenly flapping randomly... no more model.

The other one was a model of a Vampire jet (with a jet engine). The conditions for takeoff were not right. The owner did a few high speed taxi tests (That were obviously failing... speed was not being achieved.) He tried to take off using the entire grass runway and ended up in the neighbors field (who tolerated the RC flying club well).

In my opinion the experience was excellent for my career. Nothing like real time "in flight emergencies" to prep for a flight test.  Wink Note: I never progressed beyond my trainer. I realized I was an ok pilot at best. But what it taught me was to tune flight simulators to match aircraft performance (I had a model AC flight simulator to practice on.) Only after putting in *exactly* my aircraft's characteristics did the computer simulation fly like my model (it turns out my switching propeller pitch was an excellent lesson into engineering trade offs in aircraft design).

Quoting FCA767 (Reply 2):
Which has got me thinking about how the real aerodynamic testers test on small scale models for big planes as the plane will react different because it's smaller...

One matches the critical "non-dimensional" numbers. That is usually Mach number. You also try to match Reynolds number, but that's tough with a small model without changing the gas flowing over the aircraft. But that flips at lower air speeds (e.g., takeoff/landing) where matching Reynolds number is more critical. But for certain things you need to match other numbers (e.g., flap vortex shedding is Strouhal number which can make predicting landing noise very tough with models as the wing needs to match Reynolds number... hence the trend to CFD verified with models).

Lightsaber



Societies that achieve a critical mass of ideas achieve self sustaining growth; others stagnate.
User currently offlineBrons2 From United States of America, joined Sep 2001, 3017 posts, RR: 4
Reply 16, posted (5 years 6 months 1 week 3 days 7 hours ago) and read 12154 times:



Quoting Kappel (Reply 11):
There are a couple of really cool video's about those big RC models. I liked the a380 video, but this one also caught my eye:

http://www.youtube.com/watch?v=KmKdA6L_MWk&NR=1

Miniature Enola Gay

Holy cow. That thing is massive! How big can an RC plane get before regulations are required?? Seriously, there are private planes that are not much bigger than that thing. You could kill someone by flying that thing into them.

Although I have to say, that's a fantastic B-29 model, sounds like they are using 2-stroke radials. The idle engine noise at the end sounds fantastic right after they land.

Meanwhile, while I'm on this thread, check out the takeoff method on this one, about 4:20 into the video

http://www.youtube.com/watch?v=dygJbqRVIz8&NR=1

LOL.



Firings, if well done, are good for employee morale.
User currently offlineLightsaber From United States of America, joined Jan 2005, 13529 posts, RR: 100
Reply 17, posted (5 years 6 months 1 week 3 days 7 hours ago) and read 11669 times:
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Very on thread.

Why there was so much testing of the A388's stopping abilities...
The A380 model you were watching did not land well. (its on the related videos)
Or more precisely, nose gear in the grass isn't a good way to stop:
http://www.youtube.com/watch?v=iVnkJtnzBsM&feature=related

Quoting Kappel (Reply 11):
Miniature Enola Gay

MINIATURE?!? Not the word I'd use...

I'm amazed at the landing. I would have done a few tail strikes...

Quoting Brons2 (Reply 16):
check out the takeoff method on this one,

Not thinking we will see that technique even for the next Beechcraft replacement...

Lightsaber



Societies that achieve a critical mass of ideas achieve self sustaining growth; others stagnate.
User currently offlineBrons2 From United States of America, joined Sep 2001, 3017 posts, RR: 4
Reply 18, posted (5 years 6 months 1 week 3 days 6 hours ago) and read 11401 times:



Quoting Lightsaber (Reply 17):
Why there was so much testing of the A388's stopping abilities...
The A380 model you were watching did not land well. (its on the related videos)
Or more precisely, nose gear in the grass isn't a good way to stop:

That's not the same RC plane as in the A380-900 videos.

But anyways. That looks like pilot error to me.

Extremely unstabilized approach.
Poor landing technique.
Late touchdown.
Attempting to turn off runway without sufficient space. He didn't have enough space to do a 180 on the runway.

All of which could have been avoided with more practice. I also think he probably should have gone around for another try after the poor approach.

Yes, the brakes aren't good, in fact they're probably non-existent. But still I blame the pilot for that mishap.



Firings, if well done, are good for employee morale.
User currently offlineFLY2HMO From , joined Dec 1969, posts, RR:
Reply 19, posted (5 years 6 months 1 week 3 days 6 hours ago) and read 11379 times:

I've flown giant scale R/C airplanes but nothing THAT big.

Quoting FCA767 (Reply 2):

Which has got me thinking about how the real aerodynamic testers test on small scale models for big planes as the plane will react different because it's smaller...

Nope. Aerodynamically there is a negligible difference between a full scale model and a smaller one. The reason they seem more unstable is because they are lighter and therefore more susceptible to wind gusts/turbulence. Otherwise the airflow is pretty much exactly the same.

The Reynolds number is used to determine any differences, if any, between a scale model and a full scale version:

http://en.wikipedia.org/wiki/Reynolds_number

Quoting Brons2 (Reply 16):
Although I have to say, that's a fantastic B-29 model, sounds like they are using 2-stroke radials.

You got the two stroke part right, but they're definitely not radial engines. It's using single cylinder gasoline/petrol engines, most likely 50-80cc range. If you notice during the starting for all 4 engines they fire up after the 3rd prop flip. That's a characteristic of those engines with electronic ignition.

Quoting Brons2 (Reply 18):
Yes, the brakes aren't good, in fact they're probably non-existent. But still I blame the pilot for that mishap.

R/C airplanes rarely have brakes. Doesn't look like the A380 models posted here have them.

There's an R/C Concorde video on youtube, that one does have brakes IIRC.

[Edited 2009-06-13 11:43:54]

[Edited 2009-06-13 12:14:00]

User currently offlinePPVRA From Brazil, joined Nov 2004, 8974 posts, RR: 39
Reply 20, posted (5 years 6 months 1 week 3 days 5 hours ago) and read 10576 times:



Quoting Lh526 (Reply 10):
1/4 (sic!) scale Embraer 145
http://www.erj145.de/

Sick indeed, but some work of art and workmanship. . .



"If goods do not cross borders, soldiers will" - Frederic Bastiat
User currently offlineKappel From Suriname, joined Jul 2005, 3533 posts, RR: 17
Reply 21, posted (5 years 6 months 1 week 3 days 5 hours ago) and read 10410 times:



Quoting Lightsaber (Reply 17):
I'm amazed at the landing. I would have done a few tail strikes...

Yeah me too, a truly incredible landing! Must be a great pilot...

Quoting Brons2 (Reply 16):
How big can an RC plane get before regulations are required??

Good question. This one is really massive. I guess as long as they stay within the confines of the test/flight area, it's ok.

Quoting Brons2 (Reply 16):
Although I have to say, that's a fantastic B-29 model

Agreed, the video went straight to my youtube favorites!



L1011,733,734,73G,738,743,744,752,763,772,77W,DC855,DC863,DC930,DC950,MD11,MD88,306,319,320,321,343,346,ARJ85,CR7,E195
User currently offlineJimbo27L From United Kingdom, joined May 2007, 61 posts, RR: 0
Reply 22, posted (5 years 6 months 1 week 3 days 4 hours ago) and read 9523 times:

Slightly OT...but check out the engine noise on this beauty...  crying 

http://www.youtube.com/watch?v=52CVrcCydig&feature=related


User currently offlineLightsaber From United States of America, joined Jan 2005, 13529 posts, RR: 100
Reply 23, posted (5 years 6 months 1 week 2 days 20 hours ago) and read 5357 times:
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Quoting Brons2 (Reply 18):
That's not the same RC plane as in the A380-900 videos.

Ahhh... thanks for the correction.

Quoting Brons2 (Reply 18):
Yes, the brakes aren't good, in fact they're probably non-existent. But still I blame the pilot for that mishap.

The old pilot error, eh?  Wink

It was a bad landing... but no worse than my normal (with RC aircraft).  spin 

Lightsaber



Societies that achieve a critical mass of ideas achieve self sustaining growth; others stagnate.
User currently offlineMCIGuy From United States of America, joined Mar 2006, 1936 posts, RR: 0
Reply 24, posted (5 years 6 months 1 week 2 days 17 hours ago) and read 4074 times:

Very nice!
How about the F-22 model with real turbines and thrust vectoring!



Airliners.net Moderator Team
User currently offlineFCA767 From United Kingdom, joined Nov 2006, 1786 posts, RR: 1
Reply 25, posted (5 years 6 months 1 week 2 days 17 hours ago) and read 3995 times:



Quoting Lightsaber (Reply 15):
One matches the critical "non-dimensional" numbers. That is usually Mach number. You also try to match Reynolds number, but that's tough with a small model without changing the gas flowing over the aircraft. But that flips at lower air speeds (e.g., takeoff/landing) where matching Reynolds number is more critical. But for certain things you need to match other numbers (e.g., flap vortex shedding is Strouhal number which can make predicting landing noise very tough with models as the wing needs to match Reynolds number... hence the trend to CFD verified with models).

Lightsaber

Thanks for clearing it up  Smile

Quoting FLY2HMO (Reply 19):
Nope. Aerodynamically there is a negligible difference between a full scale model and a smaller one. The reason they seem more unstable is because they are lighter and therefore more susceptible to wind gusts/turbulence. Otherwise the airflow is pretty much exactly the same.

The Reynolds number is used to determine any differences, if any, between a scale model and a full scale version:

http://en.wikipedia.org/wiki/Reynold...umber

and the same  Smile


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