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May 14, 2002, 03:49 PM | #51 |
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I'm going to have to throw in with my fellow teufelhund STRLN here. The point of STOM is to bypass the enemy’s strongpoints (i.e., beach defenses facing out towards the beach). This is a basic principal of maneuver – as opposed to attritional – warfare. Review your FMFM 1-1.
I don’t know enough about the Osprey to know if it will ever be worth a darn, and I've never understood why we couldn’t get some Blackhawks, but that doesn’t mean the Corps shouldn’t try to develop a better mousetrap. They made fun of the Corps when we were developing amphibious warfare in the ‘30s, but it turned out to be visionary. quote: -------------------------------------------------------------------------------- … There was some testing done with MK19 Grenade lauchers mounted in the 53s and 46s a few years back. They just don't have enough range. … The M2 can reach out there effectively. The MK19 can go out to 1000 and beyond easily, but it just isn't as effective from a rapidly moving platform. … -------------------------------------------------------------------------------- I doubt the _range_ is the problem with the Mk19 vs the M2. The Mk19 has a max effective range of 1500m and the Ma Deuce has a max effective range of 1830m, at least when HMMWV- or tripod-mounted, though I don’t know how well that translates to aircraft mounting. The difficulty in using it from moving aircraft, I'd suspect is due to the different time in “flight” of the two rounds: it is _significantly_ longer for the 40 mike-mike vs the .50. Torquemada – I couldn’t disagree with you more. I think the _greatest strength_ of the U.S. military is the division into branches, each with a specific mission. In a decentralized structure like this, each branch can develop doctrines and weapons/transport systems to fit its own particular mission and can learn from the other. If anything, it doesn’t go far enough; each branch should be unlimited (except by its budget) as to which types of gear/vehicles/aircraft it buys. If the Army ever wants to get decent fixed-wing CAS, for example, it needs to get its own fast-movers, because it’s a low priority to the Zoomies. Semper fi, Bruegger out |
May 14, 2002, 04:07 PM | #53 |
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Well, you didn'd read what I said too carefully.
I didn't say its current implementation IS the better mousetrap, but I think the IDEA - a longer-ranging, faster airframe with greater carrying capacity - is. S/F |
May 14, 2002, 04:08 PM | #54 | ||
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Quote:
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Did I mention that it met or exceeded the requirements outlined by the Marine Corps? Dollars to doughnuts, if the 360 was a Bell design, or at least a joint venture with Bell...they'd have been all over it. The DoD has been in bed with Bell since the 60s, and they ain't usin' protection. |
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May 15, 2002, 01:42 AM | #55 | |
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Army: fights on land Navy: fights at sea Marines: original purpose was to repel boarders, no? Air Force: from Army Air Force, which was (at least in function)from Army Signal Corps (balloons n' stuff) Each branch keeps redefining its role until nobody knows what their role is. The example of the RAF in WWII (RAF wanted operational control of ALL aircraft): it didn't work because of interservice rivalry, and sea-going planes were generally piss-poor compared to U.S. and Japan because they were an adaptation of existing land-based planes; the RAF couldn't cooperate intraservice either. In an idealized world, neither the Army nor the Marines would need their own private air forces. They fight for their own specialized fleets because they cannot "depend" on the Navy or Air Force, WHICH IS EXACTLY THE PROBLEM. When a new toy is developed, the other branches take a look to see how they can work it into their plans, and change the plans to get the new toys. If the Marines want a fast transport, other provenalternatives are out there, but it's supposed to fight its way in? Add armament and speed, maneuverability drops; add bigger engines to regain speed and range drops; add bigger gas tanks and transport capability drops. A transport's job is to move tonnage, nothing more or less. A fighter/bomber/CAS/attack helo's job is to throw ordinance. A jack-of-all-trades is the master of none, and a design by committee ultimately satisfies no one.
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May 15, 2002, 10:17 AM | #56 |
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The OSPREY Now
George,
Your misinformed posts pushed me to register and post for the first time, and not even on a gun-related topic! You said: <The Osprey is one of my favorite aircraft designs ever... but I still admit that the thing is a huge failure. It's the new Sgt York.> As the original whistle-blower on the DIVAD Gun/ Sgt. York, and the current guy responsible for oversight of the test program on the V-22, let me relate a couple of points, good and bad. First, the Frogs are getting so old they're falling out of the sky. Second, the V-22 carries 24 Marines at 250 knots and it can maneuver defensively at 3.5g. It can come from a ship over the horizon to any one of a number of LZs 500+ miles from the ship. It can lift over 10,000 lbs externally (HMMMV, howitzer). We're about to re-start a two-year flight test program on a redesigned aircraft (hydraulics and nacelles) that will answer finally the controversial issue of vortex ring state and operational maneuvering. George, you certainly are entitled to your opinion, and you're not alone if you believe the tiltrotor is a flawed concept. But I, for one, believe that the potential of the OSPREY is worth going after. Tom Carter |
May 15, 2002, 10:43 AM | #57 | |
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When you take pilot/maintenance error out of the equation, the old battle phrog suddenly doesn't look so bad. If HMM-264 and HC-3 can do it. So can everyone else. Obviously the H46 does not meet the future needs of the Marine Corps (as the current leadership defines them), but I honestly think the Marine Corps is making a big mistake by eliminating the H46 from the wing outright. As I've said before, the Osprey (or something else as capable) has a place alongside the current medium lift aircraft. Not in place of it. STLRN is right, regardless of how we got here, or whether the doctrine is viable, it is here. No point arguing about OMFTS and STOM. However, I think that totally writing off the Boeing 360 project in favor of the Osprey might have been caused by a case of "tilt rotor tunnel vision" combined with some politically motivated "Bell backscratching". The Osprey is killing Marines. That's understandable. Most new designs do that for a while. It's a shame, but some must be willing to take the risks and make the sacrifice for the good of the Corps. Not all heros die on the battlefield. I'm just afraid that the Osprey will continue to kill Marines in combat and training for a very long time. Back on topic... The issue of defensive capability has not been addressed yet by any proponents of the V22. Would you care to share any information on how this is being addressed, Leatherneck? Last edited by fix; May 15, 2002 at 01:09 PM. |
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May 15, 2002, 11:34 AM | #58 |
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Leatherneck, Welcome to TFL. And thanks for speaking up - seriously.
You are lucky to have insider information that I dont have... so true - I am misinformed... Your right. Please allow me to ask you some questions then, as I would love to become informed. First, why is the military using the 5000PSI hydraulic system that is prone to failures and leaks instead of the proven 3000PSI system? That's not making much sense to me. Second, The location of the engines, gear boxes and rotors at the wing tips causes relatively high roll and yaw inertia... Bad karma for ship based operations. It is reported in official naval reports that this is dangerous to the point of possibilty occluding the V-22 from all ship based operations. What is being done to correct his design flaw issue? Third, If this design is so good... why is the military fronting all the lettuce for development for this when such a thing would have commercial applications. The DOD didn't pay for the Bell 206 or the Boeing 747... In fact, the civililian version of the same tilt rotor system was totally scraped. If the design and concept is so good, where is the Civvy version? Forth, if the Osprey is so good... why wouldn't an AV-22 version be planned... you know, like an AH platform... guns... missles... the usual fireworks. Why do we have to develop from scratch a whole new kind of aircraft using whole new technologies we don't even have yet - just to ESCORT the Osprey? http://nationaldefense.ndia.org/article.cfm?Id=570 I remember that we had the same issue in Nam that was solved easily... do the phrases "Slicks" and "Hogs" mean anything to the military anymore? Sure the Osrey could carry more grunts than a Seahawk... but the Osprey is costing us 118 Million a pop while a Seahawk costs only 17 million. Now, correct me if I'm wrong and uninformed here... but you could carry more troops with 2 Seahawks, than you can with 1 Osrey... and you could save 84 million. Oh, and save 6 or more years of development time and money. 6 years just being a guess as that's the claimed timeline while at the same time you guys are saying there is no timeline... meaning what? Another 10 years or so? Because as it stands right now, Boeing is making more bank developing this thing than they would if they just actually built ones that work. Right, I know they are building them... we have how many in storage? 50? Maybe more? I may be wrong - but my info is based of publicly availabe information (such as official reports and stuff). If I am wrong, then the whole program needs a PR person to sell it better. http://www.setp.org/uniquetiltrotohandlingcharac.htm http://www.g2mil.com/TRAAC_Shipboard_OPS.pdf http://www.g2mil.com/Natops%20Extracts.PDF http://www.g2mil.com/ReporttoCongress04-2002.pdf http://www.navair.navy.mil/v22/future.cfm We don't even need to go into brownouts or other issues... yet. Tell us more about this stuff... I am interested... Seriously. I love the V-22 as its a cool design - I just don't see it actually working as a real tool for the military. I can say that, just like I can say that I like Tie Fighters and the Millenium Falcon too. (that last link to the Naval air website... how come the missions described are not combat missions? I don't see anything about dropping off troops... Air to Airt refueling? I can see that... That's something a COD can't do. At the moment. I think the Navy could fix that if they wanted to.)
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May 15, 2002, 11:41 AM | #59 |
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I am torn between "don't fix what ain't broke" and "we need to explore newer and better".
The old H-25 was sorta usefull for a little cargo, mine sweeping, troop insertion. Twas physically demanding to fly when right and extremely hard to fly without boost. And being a reciprocater, it was short on power and really limp when hot. I think we left most of those burning in rice paddies. The Bell HSL was bought as the first dedicated ASW platform. Bell's only production tandem roter rig. Didn't last long. Then came the HUS/HSS/H-34. Decent load capicity, decent hydraulics and ASE (automatic stabilization equipment) that worked. Real all weather capability. When the ASE failed or the hydraulic boost failed it was a bear to handle but flyable. For a reciprocater it had good power. Then came the turboshaft with it's great power to weight ratio. I have flown twenty plus models of rotary wing aircraft, all of which were controllable even with loss of control boost and/or ASE. We are getting into such a state of sophistication that birds are becoming systems dependant. I do not know, but I fear the Osprey is similar to the F-117 in that the only one who could fly it without ASE would be a test pilot with the strength of a gorilla. Sometimes I wish I were younger, other times I am glad I'm not. But my grandkids gonna be goin in harms way and I do fret about the equipment. Sam |
May 15, 2002, 11:50 AM | #60 |
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What about autorotation?
I've been in 3 situations (as the grunt in the back) when the bird had to autorotate. Different reasons each time and different situations. One resulted in a lot of damage and a couple people hurt. I still think I'm 1/4 inch shorter from one of them. Can the V-22 do that? Surely it could glide somewhat right? Or does it glide the same way bricks don't?
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May 15, 2002, 01:01 PM | #61 |
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Gents,
Thanks for your courteous responses. I'll try to briefly provide a bit more info. The 5000 psi system has been a source of concern to me from the outset. As have the titanium lines. Both, of course are there for weight reduction purposes (a small, high-pressure actuator vs. a bigger, heavier 3000 psi version). The crash of two of my buds at New River in 12/2000 was caused by a chafed titanium line suffering a major blowout at one of the few points in common between the two primary hydraulic systems. The nacelle redesign has increased the 1/2" clearance between lines and anything else previously required, and added dynamic maneuver loads to the conditions under which wire bundles and hydraulic lines can't come in contact. As we get back in the air in the next week or so, rigorous post-flight and periodic inspections will be conducted, but the critical area of the nacelles is a bitch to get into to inspect. re: roll inertia. Seems to me more roll inertia would be good, as we've experienced a little "squirrelyness" in the lateral axis. God knows there's plenty of control power out there! The commercial variant is on hold pending safe return to flight, but the company (Bell only--not Boeing) told me they have about fifty orders for the model 609 already. The AV-22 is a cool idea, but neither the Marines nor SOCOM (Special Forces owners of the CV-22) have adopted it. Seems like it would be a great source of firepower right out there with the guys that need it. OSPREY @$117M and Seahawk @$18M may be apples and oranges to some degree. But no doubt, the V-22 is WAY more 'spensive. re: timelines. I've had to move heaven and earth to get these guys to stay "event-based" and not cut corners. That's one of the hardest things for a program to do, because as soon as you adopt a schedule, Congress, DoD, the media and the warfighters start stopwatches. What they must do in this "one strike and you're out" environment is go slow but steady and never make a misstep. Brownouts--probably will be as bad as a 53E, and will be handled similarly. But the downwash in some quadrants under a heavy OSPREY is truly awe-inspiring! Sam, you mentioned power-to-weight ratio. Man, this thing has that in spades! Pushes you right back in the seat during conversion and suddenly you're accelerating through 180 knots. That, along with your rightly placed concern about systems-dependent aircraft, tells me that at least at first we're going to have to pilot this bird with only experienced pilots. The simulators are great though. There is one pilot now getting ready to resume flying who has over 500 hours in the sim, and 18 in the V-22. So my net assessment at this point is that it's an awful expensive machine with unrivalled performance that will suit itself well to the OMFTS/STOM scenarioes. But it absolutely has to be sterling silver-quality and we have to figure out in the next two years of flight testing if the operational guys can live with vortex ring state and the V-22's unique response to it. S/F Tom |
May 15, 2002, 01:23 PM | #62 |
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For a second there I thought you were spoofing... but your IP address belonging to "PENT.NIPR.MIL" puts you right there. I guess we can safely assume that you Leatherneck, are indeed the Horse's Mouth. Forgive me if I seem to be the other end.
You'll quickly learn and pretty much everyone here will happily verify that I am the most disagreed with character on TFL.
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May 15, 2002, 01:43 PM | #63 |
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Torquemada – the role & mission of the USMC is defined by statute, as is its minimum size of three Divisions and three Air Wings. There is no argument over its role, which hasn’t been primarily to “repel boarders” since the days of wooden ships. Hint: it has to do with providing expeditionary forces.
Your comment about “Heck, another idea that looks good, on paper” is more appropriately applied to your scheme of a single unified “military.” The decentralized multi-branch approach is what we’ve done for 227 years and it’s worked quite well. Maybe “In an idealized world, neither the Army nor the Marines would need their own private air forces,” but this is the real world and real people are in it. The Corps needs its own assets for the same reason the Navy needs its own ships. Centralizing all aircraft with the Air Force and all tanks with the Army is as sensible as prohibiting Police Departments from having cars because the Highway Patrol can patrol all the roads. Semper fi, Bruegger out I said-- I think the _greatest strength_ of the U.S. military is the division into branches, each with a specific mission. In a decentralized structure like this, each branch can develop doctrines and weapons/transport systems to fit its own particular mission and can learn from the other. If anything, it doesn’t go far enough; each branch should be unlimited (except by its budget) as to which types of gear/vehicles/aircraft it buys. If the Army ever wants to get decent fixed-wing CAS, for example, it needs to get its own fast-movers, because it’s a low priority to the Zoomies. quote: Heck, another idea that looks good, on paper. Army: fights on land Navy: fights at sea Marines: original purpose was to repel boarders, no? Air Force: from Army Air Force, which was (at least in function)from Army Signal Corps (balloons n' stuff) Each branch keeps redefining its role until nobody knows what their role is. The example of the RAF in WWII (RAF wanted operational control of ALL aircraft): it didn't work because of interservice rivalry, and sea-going planes were generally piss-poor compared to U.S. and Japan because they were an adaptation of existing land-based planes; the RAF couldn't cooperate intraservice either. In an idealized world, neither the Army nor the Marines would need their own private air forces. They fight for their own specialized fleets because they cannot "depend" on the Navy or Air Force, WHICH IS EXACTLY THE PROBLEM. [snip] |
May 15, 2002, 02:33 PM | #64 |
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Bruegger condensed.
Design something to do all things. And it won't. Sam |
May 15, 2002, 02:37 PM | #65 | |
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May 15, 2002, 02:39 PM | #66 |
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<suction on>
George, I haven't seen anything so disagreeable about your posts that i've read. But thanks for the warning. <suction off> Autorotation--probably a bad idea in the V-22 or any tiltrotor, owing to the relatively low energy storage ability in the rotor system. Based on VERY preliminary tests, getting the rotors down below 30 degreees or so quickly and arresting the sink rate with flare will be more promising. Operational experience with autorotation in medium and heavy helicopters seems to mirror your experience--only about half are successful. In an emgine-out situation in the V-22, probably the best one can hope for is to cushion the impact so the crashworthy structure can do its job and save the occupants. The aircraft will be lost. To date, the V-22 has never lost engine power in flight, except for the 1994 fire at Quantico. And to require autorotation, you'd have to either lose both engines or one engine and the synch shaft. The good news is that time spent in the "dead-man's zone" is brief in the V-22 because of its phenomenal acceleration/deceleration capability. S/F Tom |
May 15, 2002, 02:57 PM | #67 | |
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May 15, 2002, 04:37 PM | #68 |
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Losing the sync shaft probably have same net result as losing the box to box drive shaft on a tandem rotor......like the 46 and 47 etc. Very rare cept for the occupants. Becomes a major part of their lives.
Seems even less likely in an Osprey type set up as the shaft should be rather lightly loaded untill getting into a single engine situation. Stuff happens. But we want the odds in our favor. Sam |
May 15, 2002, 04:50 PM | #69 | |
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May 15, 2002, 08:10 PM | #70 | |
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Marine Aviation in general
http://www.g2mil.com/MarineAir.htm
Here is an interesting take on the subject: Quote:
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May 15, 2002, 08:10 PM | #71 | |
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Continued
Quote:
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May 15, 2002, 10:30 PM | #72 |
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Fix......aside from the likely entanglement of blades, loss of shaft on 46 while rotor discs are loaded tends to induce a nearly instant tumble. Powered end goes up in relation to the limp end.
Quick way to take out one engine and the sync shaft would be gearbox failure. Again, rare...........but it happens. Sam |
May 16, 2002, 12:05 AM | #74 |
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It has been bout 45 years since the Osprey's grandaddy first flew. The Vertol VZ-2. Started flight test in 1957.
Not what one would call overly rapid developement. Tilt wing with two proprotors at the ends of the wing. Transition from forward flight to hover was a bear. Steep descents in the VTOL configuration were hazardous due to thin line between workin blades and stalled blades. Not much seems to have changed re the original problems, just that now we have more sophisticated systems that are plagued with problems. Boeing found a whale of a cow to milk. Sam |
May 16, 2002, 01:33 AM | #75 | |
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Navy guy weighing in.
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