Quote from: edkyle99 on 06/27/2014 04:59 pmQuote from: baldusi on 06/27/2014 04:44 pmQuote from: Stan Black on 06/27/2014 04:31 pmQuote from: fregate on 06/27/2014 12:38 amQuote from: asmi on 06/26/2014 09:58 pmQuote from: Stan Black on 06/26/2014 09:15 pmThat single engine also feeds four roll nozzles?Where are those nozzles?There are none - it will employ aerodynamic control surfaces for roll control.aka fins So was it eliminated from the design? And how will Angara-A5 work?AIUI, since the RD-191 has a single nozzle and no other exhaust (it's SC after all), they use the fins to avoid spin. And I believe they have some RCS, too. On the heavier versions, they have multiple cores and thus nozzles that they can TVC to correct any deviation and/or rotation. Thus, fins are unnecessary.Yes, my notes say that roll control is via. thruster once out of the atmosphere. Those fins are only going to work for less than half of the burn time. Also, Angara 5 will burn its boosters out and jettison them before the core (those were the original plans any way), so it too will need roll control. - Ed KyleThat clears a lot up, thanks for the info guys. Do the fins move at all or do they provide passive roll control?
Quote from: baldusi on 06/27/2014 04:44 pmQuote from: Stan Black on 06/27/2014 04:31 pmQuote from: fregate on 06/27/2014 12:38 amQuote from: asmi on 06/26/2014 09:58 pmQuote from: Stan Black on 06/26/2014 09:15 pmThat single engine also feeds four roll nozzles?Where are those nozzles?There are none - it will employ aerodynamic control surfaces for roll control.aka fins So was it eliminated from the design? And how will Angara-A5 work?AIUI, since the RD-191 has a single nozzle and no other exhaust (it's SC after all), they use the fins to avoid spin. And I believe they have some RCS, too. On the heavier versions, they have multiple cores and thus nozzles that they can TVC to correct any deviation and/or rotation. Thus, fins are unnecessary.Yes, my notes say that roll control is via. thruster once out of the atmosphere. Those fins are only going to work for less than half of the burn time. Also, Angara 5 will burn its boosters out and jettison them before the core (those were the original plans any way), so it too will need roll control. - Ed Kyle
Quote from: Stan Black on 06/27/2014 04:31 pmQuote from: fregate on 06/27/2014 12:38 amQuote from: asmi on 06/26/2014 09:58 pmQuote from: Stan Black on 06/26/2014 09:15 pmThat single engine also feeds four roll nozzles?Where are those nozzles?There are none - it will employ aerodynamic control surfaces for roll control.aka fins So was it eliminated from the design? And how will Angara-A5 work?AIUI, since the RD-191 has a single nozzle and no other exhaust (it's SC after all), they use the fins to avoid spin. And I believe they have some RCS, too. On the heavier versions, they have multiple cores and thus nozzles that they can TVC to correct any deviation and/or rotation. Thus, fins are unnecessary.
Quote from: fregate on 06/27/2014 12:38 amQuote from: asmi on 06/26/2014 09:58 pmQuote from: Stan Black on 06/26/2014 09:15 pmThat single engine also feeds four roll nozzles?Where are those nozzles?There are none - it will employ aerodynamic control surfaces for roll control.aka fins So was it eliminated from the design? And how will Angara-A5 work?
Quote from: asmi on 06/26/2014 09:58 pmQuote from: Stan Black on 06/26/2014 09:15 pmThat single engine also feeds four roll nozzles?Where are those nozzles?There are none - it will employ aerodynamic control surfaces for roll control.aka fins
Quote from: Stan Black on 06/26/2014 09:15 pmThat single engine also feeds four roll nozzles?Where are those nozzles?There are none - it will employ aerodynamic control surfaces for roll control.
That single engine also feeds four roll nozzles?Where are those nozzles?
The RD-191 engine:-- Creates control moments in the pitch and yaw axes by gimbaling in two planes, and in the roll axis by utilising the off-axis thrust nozzlesFor the first stage of the Angara 1.1 and Angara 1.2 LVs and the second stage of the Angara A3 and Angara A5 LVs, the engine is equipped with roll control units. The side modules do not have such units.To control the LV with respect to roll, two aerodynamic control surfaces and four nozzles that run on gas drawn from the main propulsion engine are mounted on the outside of the tail section.Angara Launch System Mission Planner’s Guide, LKEB-0206-0732 Revision 0, December 2002
TVC in channels of pitch and jaw is provided by deflections of combustion chamber in a Cardan suspension. Besides this, the engine can feed a generator gas for running of nozzles providing control on a roll channel. This feature of the engine is crucial for control of the first stages of lightweight launch vehicles and of the core boosters of intermediate/heavy launch vehicles. The engine fulfills two additional functions:-• heating of gas (helium) for a pressurisation of propellant tanks and • bleeding of fuel after a pump for running of hydraulic actuators providing deflections of combustion chamber and aerodynamic rudders.“ANGARA” LAUNCH VEHICLE FAMILY CONCEPT, DEVELOPMENT STATUS AND OPERATIONAL PLANSA. Medvedev, A. Kuzin, E. Motorny, Khrunichev Space Center, Russia, B. Katorgin, NPO Energomash, Russia
It could take as long as a week to fix the problem, industry sources said on the Novosti Kosmonavtiki web forum. GKNPTs Khrunichev, the Angara's manufacturer then posted a one-line press-release saying that the date of the next launch attempt would be announced later.According to other sources, a valve on the oxidizer line failed, which could require to return the rocket to the assembly building, to cut out the device and weld in the new valve. Due to a built-in nature of the valve, the return of the rocket to the manufacturing plant in Moscow could also be required, likely postponing the mission for weeks.
http://www.russianspaceweb.com/angara1pp.html#0727QuoteIt could take as long as a week to fix the problem, industry sources said on the Novosti Kosmonavtiki web forum. GKNPTs Khrunichev, the Angara's manufacturer then posted a one-line press-release saying that the date of the next launch attempt would be announced later.According to other sources, a valve on the oxidizer line failed, which could require to return the rocket to the assembly building, to cut out the device and weld in the new valve. Due to a built-in nature of the valve, the return of the rocket to the manufacturing plant in Moscow could also be required, likely postponing the mission for weeks.
Quote from: owais.usmani on 06/27/2014 08:37 pmhttp://www.russianspaceweb.com/angara1pp.html#0727QuoteIt could take as long as a week to fix the problem, industry sources said on the Novosti Kosmonavtiki web forum. GKNPTs Khrunichev, the Angara's manufacturer then posted a one-line press-release saying that the date of the next launch attempt would be announced later.According to other sources, a valve on the oxidizer line failed, which could require to return the rocket to the assembly building, to cut out the device and weld in the new valve. Due to a built-in nature of the valve, the return of the rocket to the manufacturing plant in Moscow could also be required, likely postponing the mission for weeks.That doesn't sound good.
Angara is built to replace the Soyuz,
Even before this news about the valve becomes public, the associated press put out a very harsh story on the angara launch attempt:"MOSCOW – The first launch of Russia's new space rocket after two decades of development has been aborted moments before its blastoff as President Vladimir Putin was watching via live feed.Friday's botched attempt to launch the Angara booster rocket was the latest mishap to dog Russia's troubled space industries, whose Soviet-era glory has faded in a series of launch failures.Angara is built to replace the Soyuz, a workhorse of the Soviet and then Russian space program, designed more than four decades ago.........."This is their story for a 24 hour delay. Imagine if SpaceX, ULA, or orbital got that coverage? I could only imagine what it will be for a return to factory delay. I suspect that the AP author wouldn't know the difference.
Russia is a bad country to most American liberal journalists for several reasons. It doesn't matter what the country does, or what Putin says, it will be generally be covered in a negative fashion. That article reads like something out of the old Pravda or Izvestia, with the names changed.
Quote from: inventodoc on 06/28/2014 12:58 amAngara is built to replace the Soyuz,Really?I thought the plan was to replace Proton with Angara 5, and Rokot/Kosmos with Angara 1.
Angara 3 replaces Soyuz ... somewhat ... roughly depending upon version
What was the last orbital system that started with a sub-orbital test?
