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05-24-2015, 10:14 AM | #31 |
Hog Driver
Join Date: Aug 2008
Location: Georgia
Posts: 12,219
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While increasing thrust with a third engine does improve the thrust to weight ratio without the need for decreasing weight, it only does so slightly, so the Rattler's t/w would hardly qualify as world class. The purpose of the trijet design was to allow airlines to circumvent an FAA rule that requires twinjets to fly a route within 60 minutes of a suitable airport in case of an engine failure. The main disadvantage is that trijets consume more fuel than twins without necessarily improving performance that much. For example, if a twinjet with an 18,000-lb fuel capacity burns 3000 pph per engine, it has an endurance of 3 hours [18,000 / (3000 + 3000)] but a trijet with the same capacity would have an endurance of only 2 hours [18,000 / (3000 + 3000 + 3000)]. So it loses a third of its endurance, thus reducing its range significantly. Sure but won't it fly faster with a third engine? Actually no. Even though the extra thrust would increase its cruise speed, the increase isn't that great because most aircraft can already cruise near their max speed which is limited by structural design, not available thrust.
Also, while the rotating wing spar would probably decrease the wing's max load factor, a CAS aircraft like the A-10 doesn't need to pull high Gs, so it's not that much of a detriment. It shouldn't affect the payload that much. Last edited by Tanksmasher; 05-24-2015 at 10:23 AM.. |
05-24-2015, 02:13 PM | #32 |
Commando
Join Date: Jan 2013
Location: Britain
Posts: 3,809
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surely most of the extra thrust of the third engine would be negated by the fact that there's a third engine? Engines aren't exactly light...
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05-24-2015, 06:15 PM | #33 |
Crimson Guard
Join Date: Feb 2012
Location: Minnesota
Posts: 1,617
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Quote:
That puts it somewhere substantially above a 1:1 thrust ratio, and then you add that third engine. This easily up there with the Raptors and Typhoons of the world, probably greater. That is definitely a "world class" T/W ratio, I would think. Quote:
The purpose of the trijet design was to allow airlines to circumvent an FAA rule that requires twinjets to fly a route within 60 minutes of a suitable airport in case of an engine failure. The main disadvantage is that trijets consume more fuel than twins without necessarily improving performance that much. For example, if a twinjet with an 18,000-lb fuel capacity burns 3000 pph per engine, it has an endurance of 3 hours [18,000 / (3000 + 3000)] but a trijet with the same capacity would have an endurance of only 2 hours [18,000 / (3000 + 3000 + 3000)]. So it loses a third of its endurance, thus reducing its range significantly.
Quote:
Sure but won't it fly faster with a third engine? Actually no. Even though the extra thrust would increase its cruise speed, the increase isn't that great because most aircraft can already cruise near their max speed which is limited by structural design, not available thrust.
Quote:
Also, while the rotating wing spar would probably decrease the wing's max load factor, a CAS aircraft like the A-10 doesn't need to pull high Gs, so it's not that much of a detriment. It shouldn't affect the payload that much.
Basing a fighter on the A10 was a dumb idea, but it made for a fantastic toy, in concept... Quote:
Im liking this discussion, hopefully im not being too pendantic or argumentative... Apologies if I am!
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05-26-2015, 01:47 AM | #34 |
Always on the rolls...
Join Date: Jun 2008
Location: OG-MS
Posts: 394
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I see it as the following for fixed-wing jet aircraft.
If it's based on actual combat aircraft from the US military inventory then it keeps the same role in my Joeverse. Therefore an XP-14F/Skystriker is an F-14 TOMCAT (air superiority fighter/fleet defense interceptor/tactical aerial reconnaissance). A Cobra Rattler is an A-10/Warthog (close air support). A Rattler CANNOT compete in aerial combat with a Skystriker. Although I love that issue of the comic book, it's not feasible. The fact it has VTOL capability just makes it a better CAS platform. Fantasy-wise it was a good idea to give it such a capability. It's a hybrid of an A-10 & AV-8 Harrier. A Night Raven is an SR-71 Blackbird. It's NOT a fighter jet. A Conquest X-30 is an Grumman X-29 but fits the role as a short-range air-air fighter jet. It would have slightly more capabilities than an F-16 Falcon. When it's a toy that's been designed by Hasbro then there's some leeway for interpretation. Cobra has never had a truly dedicated air-air jet fighter. I don't like the pythonized stuff when they swap vehicles & change the names. The Cobra Hurricane VTOL w/ Vapor figure never struck me as a dedicated attack/fighter. I used it as a personal extraction aircraft for the Cobra Hierarchy, primarily Cobra Commander. The Condor Z25 is a fast bomber like the Rockwell B-1 Lancer. The Phanton X-19 is a multi-role aircraft. It's a hybrid of the following: F/A-18 Super Hornet & Lockheed F-117 Nighthawk. It has fighter capabilities of the Super Hornet, attack capabilities of both the Hornet/Nighthawk & the stealth capabilities of the Nighthawk. It's still probably the baddest aircraft in the Joeverse. The Storm Eagle & Thunderwing are versions 1 & 2 of the F-22 Raptor. Hopefully Habro will make a version of the F-35 Joint Strike Fighter. The Stellar Stilleto was just plain STUPID!!! Should have been billed as a delivery vehicle for Destro's T.A.R.G.A.T.s. The Firebat is used to defend Cobra Island. And IMHO by today's standards of aerial-design & capabilities a 'Mudfighter' would probably be the equivalent to a UAV/Predator/Raptor. It just has that look to me.
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Laissez Les Bon Temps Rouler!!! Former G.I. Joe Battleground Invite ID : LWqJdr Last edited by Ruffian 7-1; 05-26-2015 at 02:14 AM.. |
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