While SkyWalker is out-of stock in almost everywhere, new big size foam models are popping out in many places out there. I just can't stop looking at this one... looks so nice!
The question here is, are those beautiful models really useful for FPV or being our Drones? I would be afraid of breaking such a beautiful thing... and the 2360mm wing doesn't looks that strong.
Those fins underneath the V tail... it looks pretty weak to touch the ground a second time.
Space would not be a problem, for sure.
Here is the link for detailed infos: RQ-4B Global Hawk
Comments
Try the Xplane version of the full size predator. It really does not like slowing down much and tries to high speed stall during turns. Very much less than fun to fly.
i like this airframe more
sandstorm airframe
Weight is the enemy of all of us, both around the waist and on our airframes. If you can find a free flight meeting, however dull you might think it will be take some time to go watch them fly. If your in the UK you won't beat the upcoming meet at Shuttleworth.
Once you see those ladies and gents putting their delicate machines through their paces you will appreciate a little more just how crude our attempts can be.
@Chris: You should remove the Raven from your list of poor fliers. The Raven model you posted a couple years back might be different than the Pro Jet version but it flies like a real gem. The only time I've had a tip stall is literally when I had zero forward movement. Every time I caused it to happen was while trying to see how slow I could get it to fly, fortunately the behavior is predictable, stalls, rolls over, falls straight down gaining speed, pull up nice and easy for resumed flight.
I'm not intending to hijack this discussion just want to defend a real nice flying platform. The Raven model is not in the same category as the other's you've listed. As pointed out, the others are large-scale planes shrunk to fit for RC. The Raven is a 1:1 model of the real Raven, it flies the way it's supposed to, but I will concede that the model is made of very light-weight fiberglass and is prone to easy cracking or breakage. I like mine so much I've pulled a mold and I am in the process of making a new fuse out of Kevlar.
With a chord of less than 4" (from my calcs - 7ft wingspan, AR = 25 or so), this puts it in a Reynolds number area of somewhere between 50k and 100k at a reasonable stall speed, which is a bit of a disaster area in terms of both lift and drag. No wonder they fall out of the sky so easily.
@Robert: It is odd, since the NASA version is the RQ-4A Global Hawk.
As Chris mentioned, scale models or the Predator / Global Hawk type or UAV airframes typically does not fly well. The problem is that the original design is for a 166 ft wingspan high altitude (relatively high speed) drone. There is no way you can just scale that down to 7 ft and expect to get a well behaved UAV with predictable stall and low speed performance. Just like there are R/C design that fly great, but would never work well in full scale. Look at the swept wings of the ScanEagle for pointers on how to make it more stable at R/C sizes.
(very) small detail but although the colors are similar to the two Dryden Block 10 Global Hawks the shape of the nose is from a Block 20 (and on) that are used only by USAF
flight video looks smooth. Little modifying and it would be great to pair with this. Been wanting to try one of these little units out.
Those wings also look to be very brittle. Won't take much of a hard landing to break one.
I do like the fact that this one is modelled with the NASA theme rather than military.
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