Category Archives: Rocket Design Theory

Boomerang Air-Launched TSTO RLV Concept Part III: Carrier Plane Support Subsystems

Before getting into my thoughts on potential options for the carrier plane itself, I wanted to mention a few nice-to-have options for the carrier plane itself. I don’t know that any of these is strictly required, but all potentially help: … Continue reading

Posted in Boomerang TSTO RLV, Commercial Space, Launch Vehicles, Orbital Access Methodologies, Rocket Design Theory | 3 Comments

Boomerang Air-Launched TSTO RLV Concept Part II: Carrier Plane Gamma Maneuver Safety Considerations

In this post I would like to discuss some of the key considerations and options governing the carrier plane for my Boomerang TSTO RLV concept. Specifically I’ll be covering considerations relating to safely supporting the Gamma Maneuver, and useful support … Continue reading

Posted in Boomerang TSTO RLV, Commercial Space, Launch Vehicles, Orbital Access Methodologies, Rocket Design Theory | 3 Comments

Boomerang Air-Launched TSTO RLV Concept (Part I)

Back when I left Masten to start Altius, I originally thought I was starting a launch vehicle company focused on reusable nanosat launchers. While we pivoted away from that to focus on space robotics, I’ve continued to dabble with a … Continue reading

Posted in Boomerang TSTO RLV, Commercial Space, Launch Vehicles, Orbital Access Methodologies, Rocket Design Theory | 20 Comments

Random Thought: “Sufficiently Advanced” Propulsion Technology

In many discussions of rocket technology, a skeptic will often make some comment about how things would be so much better if we had Warp Drive. But the reality is that we don’t really need Warp Drive for things to … Continue reading

Posted in Rocket Design Theory, Technology | 14 Comments

SSTO is a bad idea, but NTR SSTO is worse

A few months ago, I spent some time describing some calculations of payload fraction that I derived to assist in the design of rocket vehicles. My motivation for getting into this type of work came about from my work on … Continue reading

Posted in Rocket Design Theory | 36 Comments

Payload Fraction Calculation for Reusable Vehicles

When I was learning how to use mass-estimating relationships (MERs) at Georgia Tech, our focus was on reusable launch vehicles, and most of our MERs came from NASA Langley, where my professor had once worked. When it came to much … Continue reading

Posted in Rocket Design Theory | 7 Comments

Payload Fraction Example Proof

Continuing with our story from last time… The next day, your boss pokes his head in your office and asks: “How’s those forty trans-Mars injection stages going?” He notices that you’re checking out scuba-dive sites in the Caribbean for your … Continue reading

Posted in Rocket Design Theory | 62 Comments

Using Payload Fraction Expressions in an Example

Now that I’ve gotten the math and derivations out of the way, let’s us the payload fraction expressions in a real-world example. Let’s say you work for the chief technologist of NASA, and he’s thinking about sending humans to Mars. … Continue reading

Posted in Rocket Design Theory | 47 Comments

Calculating Gross-Mass-Sensitive Term

In the last post, I attempted to calculate a basic expression for the propellant-mass-sensitive term (lambda) and in this one I will attempt to do the same thing for the gross-mass-sensitive term (phi). In so doing, I will hopefully be … Continue reading

Posted in Rocket Design Theory | 3 Comments

Calculating Propellant-Mass-Sensitive Term

In my last two posts I’ve been talking about calculating payload fraction of a rocket using the mass ratio from the rocket equation and some vehicle parameters that have been sensitive to propellant mass and gross mass. To use these … Continue reading

Posted in Rocket Design Theory | 4 Comments