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topspeed

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Viewing 15 posts - 586 through 600 (of 2,657 total)
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  • topspeed
    Participant

    Sorry I still don’t get it.

    Car range can be easily increased by adding battery Kg and the amount of power needed to move the car doesn’t increase very much. It doesn’t work like that with aeroplanes, remember this thing has a max take off weight of 600kg of which 200Kg is passengers.

    Some A level maths , plus a little Google means this thing needs 200kw/hr of battery, which weighs in at 1300Kg (note I’ve not done an iteration with the likely mass increase but it will snowball). Electric motors come in at 2 KW per Kg so 320Kw of motor comes in at 160Kg. The rule of thumb for state of the art power electronics is that it will weigh the same as the motors, so there’s another 160kg.

    This thing range will be limited to the length of its power lead at best.

    I can’t even be bothered to await the roll out with interest.

    I think you didn’t know about E-Genious yet ?

    http://soaringcafe.com/2014/07/klaus-ohlmann-flies-7-world-records-e-genius/

    in reply to: Gripen E unveiled #2164445
    topspeed
    Participant

    You mean it looks like it might be an upgraded 4th generation fighter and not a revolutionary 6th generation super plane?

    This could be the 4.99 generation craft…with alien technology far beyond the eye can see.

    in reply to: General Discussion #282189
    topspeed
    Participant

    Sure, a plane flies thanks to faith, not thanks to the laws of physics.
    A commercial airplane WILL be heavy. It is meant to transport stuff. Either freight of living beings. So your weight will either go to cramming as much cargo as possible in it, or having all necessary life support systems. Including pressurization and providing oxygen.

    A good glide ratio doesn’t cut it. As far as I know, you have to be able to get back to an airport ( with a flight time of n minutes) on one engine, maintaining level flight ! Ever heard of ETOPS (or other such regulations? )

    As for the concept of “pedal of you’re going down” in the case of emergency, I’m sorry but I don’t think any aviation instance would even remotely accept it. Oh, and that also adds weight to your fantasy planes, btw.

    May I also remind you there’s a general discussion forum, and a RC planes forum, as these daydreams would be more at home there.

    Frank we all know that solar powered nor muscle powered flight is fantasy. But you are right that solar powered flight is displaying figures similar to Wright flyer at the moment.

    https://en.wikipedia.org/wiki/Wright_Flyer

    Everything is a fantasy at the beginning.

    in reply to: SAAB Gripen and Gripen NG thread #4 #2166182
    topspeed
    Participant

    I used to know someone who was 2.08 metres tall. He drove a Volvo. Said it was because he fitted in it.

    Mine was before the ownership went to chinese, but the Geely has turned interesting with revamping the SAINT.

    in reply to: The PAK-FA News, Pics & Debate Thread XXV #2166384
    topspeed
    Participant

    No need to post this kind of crap.

    This has the same figures; http://www.defenceaviation.com/2008/01/su-pakfa-a-russian-stealth-fighter.html

    in reply to: SAAB Gripen and Gripen NG thread #4 #2166388
    topspeed
    Participant

    It’s always the same sequence that is pictured. This time we have to see the engine installation and roll out as a supplementary bonus (notice the petal airbrake that are still on).
    Given that the fuselage was left idle on the production line for quite a considerable laps of time (in the film it’s then interrupted by a two day sequence with a lot more of activity around the bird and none in the background), we have the right to be concerned with conformity or problem with the quality of the design.

    And I am still wondering how they plan to remove the wing on the field when they need to move a damaged airframe around. The Grip supposed ability to operate from dispersed airfield doesn’t match with this.

    Is it possible that when they make the plane like that it becomes the only aircraft that in fact can be operated from any one mile long country road which is approximately straight.

    in reply to: SAAB Gripen and Gripen NG thread #4 #2166391
    topspeed
    Participant

    For your concerns, I drove a Saab for nearly 300k km admiring the quality of its manufacturing and clever engineering every single day I owned it, a car built in Gotheborg, a city where stand also one of my former employer with who I shared a great deal of satisfaction over our modest achievement in the auto industry (safety). I don’t care that the bird is Swedish, French or built by chimps or in the US. I have presently no stake at it that will stain the honesty of my comments. I share simply my concerns only given what I see.
    Now, if it happens that intellectual honesty is something that repulse you, you might not want to share with me over a public forum. Thanks in advance.

    And by the way, I know my Swedes.

    I actually drive a Volvo with proven Ford engine technology. I bought the car as it was the only car I was able to fit inside comfortably. I had french car before that and new German car was also limited in cockpit size.

    topspeed
    Participant

    Given most electric cars can barely manage 100miles on a single charge using a battery which alone, weighs approximately the same as the entire empty weight of this aircraft, why is anyone giving this the time of day?

    If these guys have a revolutionary & highly secret battery technology why are they so stupid to try selling it in such a mega high risk venture and not say a car which would dominate the green car market……..or just sell the IP to Musk or BMW. It makes no sense.

    I reckon it’s got confidence trick written all over it;-
    So why is a top European Technology Agency such as ESA backing it?
    Is there another level of fraud going on here with EU money?
    Or are some investors now so technically ignorant, it’s become really easy to extract money.

    I wouldn’t be so direct. The fact that street legal cars cannot do 1000 km does not mean it wouldn’t be possible.
    One engineer ( Andraxxus ) here counted that alone stereos, airconditioning and headlights in a car today consume more electricity than A-model Ford’s engine produced power (3 kw ) some hundred and ten years ago.

    in reply to: General Discussion #282377
    topspeed
    Participant

    Burnelli lifting fuselage would provide lotsa area for solar panels.

    [ATTACH=CONFIG]245896[/ATTACH]

    in reply to: Was P-38 copied from D-2 ? #869358
    topspeed
    Participant

    Here is the Tow Snyder Show proof. Episode 2/26/1979

    http://www.tv.com/shows/the-tomorrow-show-1973/season-6/

    in reply to: General Discussion #282381
    topspeed
    Participant

    Even R/C gliders do 505 mph ( 813 km/t ) easily; https://www.youtube.com/watch?v=hFPJ6DUAY10

    That is not even at high altitude.

    in reply to: General Discussion #282382
    topspeed
    Participant

    It will be interesting to see the regulatory burden on electric aircraft.
    Just as powered airlines must carry extra fuel for diversions, electric a.c. will certainly have to carry spare power with them in case their cells quit functioning.

    Yes, they will need to be pressurized, the added structure will add weight .

    Yes Boyle it would have to be pressurized just like the APOLLO LEM was. I figure you need stronger hull section in the practically flying wing kinda contraption anyway and it could easily thus be made into a pressure vessel. The energy for the pressurisation would come when all on the board would be cycling at 150 watts power constantly it would then yield 200 x 150 watts = 30 kW…which is sufficient I figure.

    Also noteworthy is that the 50/1 glideratio craft can glide 1000 km from an altitude of 20 ( 25 ) km easily. It can do it in the night time too…and below 3000 meters the pedallers could produce the APU power for the controls…above that it needs some battery charge.

    Weight is not your enemy on this lack of faith is definitely ! Gliders weight 70 kg/m2 ( wing loading )….and 747 ( Boeing ) 550 kg/m2 which is overweight for solar aircraft surely.

    I am also convinced that the craft could be moderatly supersonic above 24 km altitude…very fast at any rate..it has to be..it would not stay airborne othervise. Helios flew 7 times faster at 100 000 ft than on sea level.

    in reply to: General Discussion #282486
    topspeed
    Participant

    Finnish company has started to produce nanocoating for solarcell which enable to absorb more sun energy into the cells…making this happen ( solar / battery flight with passengers ).

    in reply to: The PAK-FA News, Pics & Debate Thread XXV #2167110
    topspeed
    Participant

    And what about PAK-FA???

    18 500 kg empty and Mtow 37 000 kg.

    http://www.militaryfactory.com/aircraft/detail.asp?aircraft_id=782

    in reply to: F-35 News and discussion (2016) take III #2167364
    topspeed
    Participant

    i think this takes the cake in presumptions

    I hear d a rumour it has a WARP speed button too. It can out maneuver F-22 and in fact paint it red with clever new afterburners that also spray red paint. What can be fancier than that ? That is way cooler than the ” birdie ” sign when inverted at an enemy.

Viewing 15 posts - 586 through 600 (of 2,657 total)