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Propulsion / Re: DB021 turboprop
« Last post by maxmwill on Today at 05:21:59 am »
Welp, decide on the scale(I think Igor discontinued one of the scales), the order the relevant DB-021, and play with the silly thing. And, as the kit has 2 021s, you can use it in that Bf-109, or even an He-100. And, as the scales are 1/72, 1/48, and 1/32, any of the twin engine bombers might be fun to play with(a DB-021 powered Do-217W, the float version of the 217 that was proposed early in its development).

Now, about the Unicraft kit, there are a few things to address(I think that  to some here, I might be preaching to the choir), such as the intake bullets. Those are not round, but rather flattened on both sides. While you could build them up with putty and spin on a Dremel, I found that the spinner from a 190(doesn't matter what scale, just one that fits) looks pretty good(the proper term being TLAR, or that looks about right, a term used a lot by the government), with minimal work being needed to make it look right, and then there are the fan blades in the intake, the ones in the kit looking like fat ovals, and nothing even remotely aerodynamic, so I prefer card stock. Looks better, and gives a better feel as to what the full size version might've looked like.

I've heard a lot of completes about Unicraft kits, and I agree, they really are terrible kits, and if you look at them with that in mind, you'll get the disappointment you're expecting. However, if you "hold your nose", and look at the kits as wonderful subjects that just need a bit more(sometimes a lot) of extra work(I love how there are all kinds of accessories "out there", resin, pe, that sort of thing, and there are a lot of modellers who seem to know nothing else when it comes to building a better scale model. But, when I was growing up, there were no such critters. You want a nice scale model, you started with the kit, then used your wits, imagination, talent, and skills to add whatever "bells and whistles" you could scrounge to your heart's content. Such as cylinder jugs. It's amazing what you can do with some thread on a piece of rod stock, It looks a lot like cylinder fins. And I'm getting to the point where I don't use a lot of pe supplied with a kit, because ignition wires are not flat, nor are push rods. And loops that seat belts are attached to are not flat, but a tiny wire half loop works better(especially on something like the Bf-108, where the seat belt attachments are so prominent). Sometimes the more modren stuff just won't cut it.

And now for a private gripe. Given that pe and resin are so readily available, why can't we get wind screen wipers? They are available for the model car fanatics, but you want wipers on that 1/48 Jet Ranger, you ass out unless you make them. Pe would be good for that, although resin might be better(lot of metal folding if pe). And louvers. Yeah, I get it, they are too small to worry about. But louvers would set a model off, such as a Couzinet Arc En Ciel airliner, which has louvers all over the nacelles(I am kicking around an idea for a 1/48 or 1/32 Couzinet. There is an old Heller kit, 1/72, I think, that is quite rare). Everyone seems to think that Connie is the most beautiful airliner ever built, but I would beg to differ, as the Couzinet airliners look like really classy French Ladies of the Evening, and down right sexy. ;)
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Space Projects / Re: Manned "Cloudbase" in Venus Atmosphere
« Last post by Archibald on Today at 05:00:15 am »
Now that's interesting. Well I suppose the main drawback is Venus gravity pull, which is as bad as Earth, since they are the same size and mass. The huge issue would be to get the processed phosphorus out of Venus gravity well.  It is a giant PITA on Earth for any SSTO, and it must be the exact, same giant PITA on Venus.

Going from a Venus floating cloudbase station to Venus orbit or escape is very similar to air-launching a planetary probe on Earth. Balloons or aircraft substract less than 1 km/s of delta-v, but escaping from the planet takes 11 km/s, plus that's logarithm, not decimal, so far worse than "11 times", closer from 15 or 20 times the energy.

It essentially boils down to
7.7 km/s from Earth surface to Earth orbit, minus drag and gravity losses (balloons change nothing compared to surface), so +1.5 km/s, total 9.2 km/s. Then that's Earth orbit, Earth escape is 11.2 km/s, so that's +2 km/s.
Venus has the exact same issue - the delta-v must be extremely similar since, while Venus is a little smaller than Earth, its atmosphere is thick chicken soup so drag losses must be worse than Earth.

As much as I like HAVOC sheer coolness factor, the huge issue would be for the crew capsule to lift-off from the zeppelin and to accelerate to Venus escape velocity - 11 km/s or bust ! A manned capsule is one hell of a heavy thing (20 000 to 50 000 pounds) and the rocket to launch it to 11 km/s is pretty huge, and the whole thing hangs on a Zeppelin ? Really ?
Admittedly, airships have far more lift on Venus than Earth because the atmosphere is extremely dense. But if one compare with Stratolaunch, then you need some kind of "Stratolaunch Zeppelin" to launch a 250 mt ton rocket, Delta II size, with a 12 000 pound capsule (and 12 000 pounds is a Soyuz-size capsule, very very small). And then, not even sure it can even reach Venus orbit, minus escape velocity.
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Aerospace / Re: Chengdu J-10 Topic
« Last post by Deino on Today at 04:43:52 am »
Purported to be J-10 crash in Zhanjiang, Guangdong province on October 18.

https://twitter.com/alert5/status/1053032479781642240

Yes, allegedly too close to populated area and the pilot decided to stay ... R.I.P.  :(

Otherwise here an image of a J-10C assigned to the 131st Brigade
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Aerospace / Re: Chengdu J-10 Topic
« Last post by seruriermarshal on Today at 03:53:51 am »
Purported to be J-10 crash in Zhanjiang, Guangdong province on October 18.

https://twitter.com/alert5/status/1053032479781642240
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Naval Projects / Re: III Reich Aircraft Carrier Projects
« Last post by Hood on Today at 03:35:07 am »
As far as I know the second Graf Zeppelin class carrier would have been identical to the first ship, probably including the 1942 modifications made to Graf Zeppelin (Atlantic bow, revised 2.4m wide bulges above roll keel).
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ProjectTech Profiles / Re: The Admiralty and the Helicopter
« Last post by Arjen on Today at 03:31:44 am »
I received my copy yesterday. Excellent job, Mr Jackson!
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ProjectTech Profiles / Re: The Admiralty and the Helicopter
« Last post by Hood on Today at 02:57:11 am »
I am really happy that you are all enjoying the book, your kind words of congratulations are very encouraging.
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Actually, the B-47 diagrams have all been scanned. But given that it's 3:39 in the morning...
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Aerospace / Re: AVIC TA-600 or AG600 Flying Boat
« Last post by Deino on Today at 01:34:45 am »
The AG600 made its successful maiden flight on water today

https://www.youtube.com/watch?v=BKM0zlcXwvs&feature=youtu.be&t=360

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Aerospace / Re: Chinese Stealth bomber program - XAC H-X (H-20)
« Last post by antigravite on Yesterday at 11:23:47 pm »
Hi,

I'm not quite sure this is related to this thread but it may fit in. Found a Chinese stealth UAV patent issued in March of 2018.

Patent number: CN207141406.
Title: Stealthy unmanned aerial vehicle driving system of all-wing aircraft overall arrangement
Applicant(s): XIAN UAVTOP AVIATION TECH CO LTD +
Inventor: 不公告发明人
Abstract:
The utility model relates to an unmanned air vehicle technique field, the utility model discloses an overcoming the not enough of current unmanned aerial vehicle driving system stealth effect difference, and providing a stealthy unmanned aerial vehicle driving system of all-wing aircraft overall arrangement, it includes intake duct, turbine jet engine and the jet pipe of following aircraft nose to tail and connecting gradually, the inlet set of above -mentioned intake duct is square at quick-witted back, its cross-section, the lower limb and the coincidence of unmanned aerial vehicle leading edge of above -mentioned air inlet, above -mentioned inlet set has the radar shielding net of being made by conducting material, and above -mentioned radar shielding netlist face and stealthy unmanned aerial vehicle surface keep camber continuous to lead to with stealthy unmanned aerial vehicle surface conductance.

A.
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