@alexicon89 If you only consider skin friction, then you are right because, for a given volume, a sphere has the least surface area.
Unfortunately, when you consider viscous pressure drag, you need to control the wake. The smaller the wake, the better. Hence, the "rain drop" shape a commenter to your post stated.
Viscous pressure drag creates somewhat counter-intuitive approaches to reducing drag,. One example is that a rough surfaced sphere...
@alexicon89 ...actually has less drag than a smooth one at high Reynold's number (i.e. higher speeds, same size and fluid). For more info, read a college fluid mechanics textbook as English Wikipedia is blacked out today in protest to PIPA and SOPA.
always landing in a net ! thats not good it sure can't have a landing gear with the huge down wing, so it's got to have that, is it such a plus to have
@krap101 I'm sure there are some aerodynamic properties associated with the downward swept winglets, but it also looks beneficial for their capture system.
@sanforce There are benefits to the downward winglets. They reduce recirculation of air around the tips of the wings which greatly reduces the vortices that normally form on the tips of wings. This makes the wing more efficient.
@tsb247 Upward winglets does that too, downward winglet makes it statically unstable, which might be intentional or it might just be designed to look unique.
What are the parameters of this launching design? What's the maximum speed at which it launches the airplane? How many G's does this launcher generate on the airplane? How much pressure is required to launch it? How much does this entire assembly weigh, and how long does it take to prepare it for launching?
Looks a bit goofy :s and landing it in a net seems a bit silly, having to erect it just to land the thing. Lol anyone else see the futaba transmitter hanging in the truck? :) Funny to see they are using commercially available equipment :)
I fly heli's and planes remote. I was wondering how they were going to land that thing. I guess that big net is as good as any. Wonder why they didn't have the tail curve up to reduce damages in an emergency landing situation? There must be SOME advantage....
When did Northrop rename the Killerbee?
iewgnem 1 month ago
love the video man
ttwilkable 1 month ago
love the video really good
smuggecko 1 month ago
very interesting thanks
jessyjessy4 1 month ago
AWSOME!!! Target practice!
4E047RHH 1 month ago
Nice:)
projectcyclopsrpv 2 months ago
Damn, still haven't seen a video of a spherical UAV capable of going amazing speeds.
Been looking ever since i saw that oO
alexicon89 6 months ago
@alexicon89 Maybe because the sphere is the second least aerodynamic shape... after a flat plate perpendicular to the flow...
krap101 2 months ago
@krap101 Are you sure? a spherical droplet is the best aerodynamic shape when it comes down to air resistance.
alexicon89 2 months ago
@alexicon89 Close... sort of. A raindrop (airfoil) is the most aerodynamic shape. A sphere is actually one of the worst.
krap101 2 months ago
@alexicon89 If you only consider skin friction, then you are right because, for a given volume, a sphere has the least surface area.
Unfortunately, when you consider viscous pressure drag, you need to control the wake. The smaller the wake, the better. Hence, the "rain drop" shape a commenter to your post stated.
Viscous pressure drag creates somewhat counter-intuitive approaches to reducing drag,. One example is that a rough surfaced sphere...
shaider1982 1 month ago
@alexicon89 ...actually has less drag than a smooth one at high Reynold's number (i.e. higher speeds, same size and fluid). For more info, read a college fluid mechanics textbook as English Wikipedia is blacked out today in protest to PIPA and SOPA.
shaider1982 1 month ago
always landing in a net ! thats not good it sure can't have a landing gear with the huge down wing, so it's got to have that, is it such a plus to have
hotrod4you2 6 months ago
may I ask how does it land
miffymichael8 8 months ago 2
@miffymichael8 UMMM THEY SHOWED IT LAND
moeroe31 7 months ago
@miffymichael8 ohh sorry I only watch a part of the video
miffymichael8 7 months ago
Alomst a Klingon Bird of Prey!!! VERY cool loud-ass engine though.... 2stroke?
Landotter1 8 months ago
I'm interested in knowing why they chose downward swept winglets? Doesn't this make the aircraft more unstable? (I'm thinking pendulum)
krap101 10 months ago
@krap101 I'm sure there are some aerodynamic properties associated with the downward swept winglets, but it also looks beneficial for their capture system.
sanforce 9 months ago
@sanforce There are benefits to the downward winglets. They reduce recirculation of air around the tips of the wings which greatly reduces the vortices that normally form on the tips of wings. This makes the wing more efficient.
tsb247 2 months ago
@tsb247 Upward winglets does that too, downward winglet makes it statically unstable, which might be intentional or it might just be designed to look unique.
iewgnem 1 month ago
engine fuel injection system was developed in australia
cliffy4418 11 months ago
beautiful
witonohalim 1 year ago
nice! rcsuperhero liked the down wingtips.
borntafly 1 year ago
stop comparing any countries with USA
dumpers!!!
donzaliko 1 year ago
What are the parameters of this launching design? What's the maximum speed at which it launches the airplane? How many G's does this launcher generate on the airplane? How much pressure is required to launch it? How much does this entire assembly weigh, and how long does it take to prepare it for launching?
zucchini2007 1 year ago
This has been flagged as spam show
Again ! Stolen from the german luna drone .(Start and landing)
FrancisJoa 1 year ago
@FrancisJoa Well, America invented the drone and GPS so I don't think so...
wtmcgehee 1 year ago
Comment removed
KiloByte69 1 year ago
@FrancisJoa
Even if it was which it is not, we won the war against Germany. To the victor goes the spoils. Go cry about it.
KiloByte69 1 year ago
Comment removed
FrancisJoa 1 year ago
Looks a bit goofy :s and landing it in a net seems a bit silly, having to erect it just to land the thing. Lol anyone else see the futaba transmitter hanging in the truck? :) Funny to see they are using commercially available equipment :)
vanepico 1 year ago
Holly crap that thing looks like the Ark Bird
NightZermeno 2 years ago
What's the altitude ceiling on these birds? Great advert as always Woracle.
mustanglead 2 years ago
I fly heli's and planes remote. I was wondering how they were going to land that thing. I guess that big net is as good as any. Wonder why they didn't have the tail curve up to reduce damages in an emergency landing situation? There must be SOME advantage....
briansmobile1 2 years ago
tits man! its the bat signal
leonscottkennedyre4 2 years ago 2