etdhlrlv - addendum

8/9/2019 Etdhlrlv - Addendum

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Wings Deployed

Wings Retracted

ELEMENT DETAILS

Empty Mass: 50 metric tonsPropellant Mass: 730 metric tonsEngine Thrust: 1,000 metric tons force

MainEngine Hardware: RS-68 pumps (3 sets)Throttle: 40% to 105%

Thrust: 1,000 metric tonsEngine Nozzle: AerospikeIsp: 468 sec

TouchdownEngine Hardware: RL-10 pumps (10 sets)Throttle: 30% to 105%Thrust: 100 metric tonsIsp: 435 sec

Cost: $100 million each


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Third Stage

Second Stage

Aerial Recovery


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First Stage Separation

First Stage


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External Tank Derived Heavy Lift Reusable Launch Vehicle

First Stage:

Element 1 and 3 feeds Element 5Element 2 and 4 feeds Element 6Element 5 and 6 feeds Element 7

7,000 metric tons of thrust

Second Stage:

Element 5 and 6 feeds Element 7


Third Stage:

Element 7 feeds Element 7


Payload:

680 metric tons stored in a stretched Element 7in the Inter-tank Region Between Oxidizer and Fuel

12 6

4

35

7


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1

2

3

4

After the ET reaches subsonicterminal velocity following re-entry,the fold-away wings and empennageare released from their shroudedfolded position and the ET pitchesdown to reduce aerodynamic forceson these systems during deployment.(1) The systems are hinged andshaped to use aerodynamic forces ofthe slip-stream to assist in the wing

and tail deployment. (2 and 3) TheET then pitches up to maximize itsrange as a glider and guides itselftoward a dedicated recovery planewhich picks it up mid-air, down-range. All systems fold-away duringlaunch beneath shrouds placed alongthe length of the ET. This minimizesthe forces the wing and tail must takethrough Max-Q and so minimizes

weight of the system.

5

Preliminary weight estimates weretaken from a careful analysis of a727-100 aircraft. This aircraft has amaximum take off weight of 76.8metric tons. The empty ET/glider hasa weight of 49.6 metric tons. The727 wing and tail sections were sizedfor a 55.0 metric ton weight assumingno lift contribution from the ET itself.So, further weight reductions are

possible. A preliminary weightstatement for these changes is givenbelow;

5.26 Wing 1.23 Tail 0.84 Flight Control 0.21 Instrumentation 0.31 Hydraulic/Pneumatic 0.89 Electrical 0.55 Avionics

Wing & Tail Deployment


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Innovation in ground handling and vehicle processing is also vitally important in lowering launch costs by reducing thenumber of people needed to ready the vehicle for flight. Seven elements require 150 people to ready launcher for flight.


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Seven Element Three Stage - 632 metric tons to Shuttle Orbit

Three Element Two Stage - 252 metric tons to Shuttle Orbit

Stage 1

Stage 2

Exhaust V Payload Weight Stage Weight Propellant W Propellant f Ideal Stage Ideal Total

4,358 252 2589 1,460 56.39% 3,617 3,617

4,541 252 1031 730 70.81% 5,591 9,208

Two Element Two Stage - 161 metric tons to Shuttle Orbit

Stage 1

Stage 2


4,358 161 1719 730 42.47% 2,409 2,409

4,541 161 940 730 77.66% 6,807 9,216

One Element One Stage - 61.7 metric tons to Shuttle Orbit

Stage 1


4,541 61.7 840.7 730 86.83% 9,207 9,207

Eight Elements Four Stages - 1,000 metric tons to Escape Trajectory

Stage 1

Stage 2

Stage 3

Stage 4


4,358 1000 7302 2,920 39.99% 2,225 2,225

4,496 1000 4186 1,460 34.88% 1,928 4,154

4,541 1000 2628 730 27.78% 1,478 5,631

4,587 1000 1129 800 70.86% 5,656 11,288

Stage 1

Stage 2

Stage 3


4,358 632 6085 2,920 47.99% 2,849 2,849

4,496 632 2969 1,460 49.17% 3,043 5,8914,541 632 1411 730 51.74% 3,308 9,200

Element Configurations

St

andard

Non-Standard

Non-Standard

Standa

rd

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