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Robert Hilton

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Viewing 15 posts - 556 through 570 (of 673 total)
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  • in reply to: XM173 Lightning up for disposal by DSA #1272297
    Robert Hilton
    Participant

    Assuming that XM173 arrived at Bently Proiry by road it must have been taken to pieces, does anybody know when and how she was transported ? I think that comon practice today is to cut the wings off and splice them back on. I guess that this is easier than taking the aircraft apart at a manufacturing joint, indeed was the lightning wing made in one piece without ‘bolted’ connections ? Lets hope a good home can be found for her.

    This one was transported by the RAF in ’77, I can’t remember them chopping the wings. We did gut the airframe before it was moved. Not everything was done iaw AP’s.

    in reply to: BBMF Flypast over Buckingham Palace #1272541
    Robert Hilton
    Participant

    Forgive my ignorance. but I don’t see a Harrier listed anyware? I know the sea Harrier was retired a while ago but don’t the RAF still fly a version of them?? and jo puplic aint gonna tell the difference, as for the one engine thing, is a 60 year old V12 petrol engine really more reliable than a Pegasus..well allright maybe it is, you cant beat points, condenser and a carburettor, as opposed to a thousand bits and pieces whirling round at a million miles a hour, I have no idea how that keeps going.
    Dezz 🙂

    Actually a gas turbine engine far more reliable than a piston engine, it requires very little maintenance by comparison. One down side, it is somewhat more sensitive to bird strikes.

    in reply to: why no follow up after Vulcan? #2546085
    Robert Hilton
    Participant

    Obviously that nice fantasy land where the RAF strike force in the 1960/70s would consist of supersonic Harriers (P1154) for tactical missions, TSR2’s for theatre missions and Avro-730’s for strategic missions is a nice place to imagine.;)

    True, it’s a pity that a little thing like money got in the way of the idea.

    in reply to: Vulcan RATOG use ? #1272595
    Robert Hilton
    Participant

    You may have read it, but as one of the groundcrew who saw the aircraft off on BB sorties, I would take it with a pinch of salt, there were no signs of lack of power on the ground. The Victors managed, they just had a lower rate of climb after take-off 🙂 .

    That was probably because the Victors were limited to 109,000lb fuel loads at the time due to fatigue problems, but were carrying full loads. I would ease out on the climb as well under the same circumstances.

    in reply to: "An SR-72? Lockheed Martin’s New Mach-6 Spy Plane " #2506037
    Robert Hilton
    Participant

    I take it you did not know that the A-12 (also YF-12 and SR-71) hydraulic fluid had to to heated so it will flow. I could see a broken line, happen often, but heat was the hydraulic fluids friend. Even the ground service cart were called “hot carts” because they had a heater system on them.

    Yes I do know that, still, too much heat is nobody’s friend.

    in reply to: Halifax Starter Trolley? #1274435
    Robert Hilton
    Participant

    I think Dutch based Rob Hilton used to have one.

    Rob, where are you?

    Cees

    Sorry Cees, I do have one but without the top cover, not sure if anyone would be interested now.

    in reply to: Duxford Victor – where's it gone? #1274545
    Robert Hilton
    Participant

    google maps shows a victor sat next to a vulcan at cosford, i haven’t been there in an age but is it still there, or was this the B1 that was scrapped?

    http://maps.google.com/maps?f=q&hl=en&q=Cosford,+Shifnal,+Shropshire+TF11,+United+Kingdom&sll=52.644222,-2.31679&sspn=0.002383,0.005021&ie=UTF8&ll=52.642959,-2.314317&spn=0.004765,0.010042&t=k&z=17&om=1

    It seems to be a very old photograph, because forgive me if im wrong, but it looks like there are 3 Jet Provost’s sat on the ramp outside the farthest hangar to the right, and the airliner collection is still intact, can anyone shed some light on this? 🙂

    It’s a K2, only the mk2’s had the Whitcomb pods on the trailing edge of the mainplane.

    in reply to: "An SR-72? Lockheed Martin’s New Mach-6 Spy Plane " #2506457
    Robert Hilton
    Participant

    Where did you hear that? I know it hit Mach 3.29 during a test flight, but I’ve never heard of it being badly damaged. The first jet was pretty screwed up after the maiden flight, but that’s because a lot of the inserts in the chines decided to no longer be a part of the program 😀

    I read it to be precise. It was the first sustained Mn 3 run made by the A12. The frictional heating was much higher than had been predicted and some wiring had been damaged. Also the a/c had lost most if it’s hydraulic oil due to the heat. The pilot later claimed that he had lost so much fluid that if he had continued flying for about 15 seconds more, he would have been walking.
    Now that would have been abit of a shock for him.

    in reply to: "An SR-72? Lockheed Martin’s New Mach-6 Spy Plane " #2506529
    Robert Hilton
    Participant

    Strangely, for the Blackbird, nobody ever asked if it made sense after all, while you can have a lively discussion when you ask if the Blackbird made M3.4 or M3.5.

    Many misunderstandings come from the disability of some media (and euphoric people) to separate between a low-scale study and a full rate production or at least test program. I would only start talking of an aircraft if the approved budget is at least 8-digit (in 2007 USD), if the term “supersonic” appears somewhere add a digit.

    Actually the only time that the A12 approachd Mn 3.3, it was so badly damaged it took eight weeks to get it airworthy.

    in reply to: Question re Wing location? #2506807
    Robert Hilton
    Participant

    Superior Distiller says no to one, yes to two (but not airliners).

    If you’d build for pure structural/aerodynamic efficiency (non BWB, that is) you’d go for a high wing with short B-47 style landing gear.
    For a modern commercial airliner it’s of course a question of packaging. You don’t want the landing gear in the belly (takes cargo space) or in the nacelles (no space there), so the wing is the location. And the rest of the story is history and airliner business conservatism.

    Low belly in military planes preferable for loading via ramp, w/o additional GSE.

    Superior Distiller out.

    Sounds about right. While you can split an airliners cargo hold with a spar box, military freighters are better with an uncluttered cargo space. As you rightly point out, low belly means quicker and easier off loading.

    in reply to: Question re Wing location? #2507072
    Robert Hilton
    Participant

    I didn’t write it and actually I think it is not entirely correct. What exactly do you want to tell me?

    My mistake, #4.

    in reply to: Question re Wing location? #2507265
    Robert Hilton
    Participant

    I thought hard but couldn’t think of any major aerodynamic advantages. Can you tell me?

    Would you then please explain post #5.

    in reply to: why no follow up after Vulcan? #2508094
    Robert Hilton
    Participant

    It is not a matter of preference, but of offloading speed. The boom was designed to offload large quantities of fuel in the shortest amount of time possible. SAC (then the owner of virtually all tanker aircraft) operated the big ones, such as strategic bombers and cargo aircraft. KC-135s have 5 different speeds to offload their cargo, with (IIRC) speed #5 for bombers and C-5s (and since its introduction the E-3) and speed #2 for fighters such as F-16s (and if fitted with a dogue USN aircraft). If you would offload the fuel to a Sentry with a drogue it would take forever, as the speed would be equal to the settings used for fighters: drogues cannot offload any faster than that.
    (this according to a boom-operator of the Hawaii ANG I flew with out of Geilenkirchen years ago)

    It is correct, the boom can off-load substantially more fuel than the probe and drogue. The mk17b HDU (centre-line fitted to Victor and VC10) can has a flow-rate of something in the region of 4,000lbs/min. The boom can be much higher. The trouble with getting the HDU to flow as much as a boom lies in the diameter of the hose. If it gets any bigger, you have more aerodynamic stabillity problems. Although the boom gives a higher flow rate, the three point tanker gives you more flexibility. It’s horses for courses.

    in reply to: why no follow up after Vulcan? #2508328
    Robert Hilton
    Participant

    Why replace the receptical system with a boom system, Why not have both, or is that verging on being sensible?.

    I think that is like saying “why don’t Airbus build one of those nice Boeings?”:diablo:

    in reply to: why no follow up after Vulcan? #2508410
    Robert Hilton
    Participant

    Yes, but 1) I thought we were discussing the feasibility of a quick fix that’d “do a trip”, & 2) if something more was wanted (i.e. we wanted to make our C-17s capable of regular air-air refuelling), the time constraint no longer applies, & a full replacement of the receptacle by a probe could be done. Not a technically challenging job, I reckon. It’s not as if one would have to worry about supersonic speeds, or radar signature. A simple fixed boom would do.

    The technicallities are not the problem with a probe, validation and certification are. That’s what eats into the budget and that is the biggest stumbling block.

Viewing 15 posts - 556 through 570 (of 673 total)