International Astronautical Congress 2010

28 04 2010

I will be presenting a paper at the International Astronautical Congress in Prague, September 2010.

Project Icarus: Mechanisms for Enhancing the Stability of Gravitationally Lensed Interstellar Communications

It is theoretically possible for a craft to use the Sun as a gravitational lens to increase receiver gain along the line joining the craft and the center of the Sun out to infinity. This could be used to assist in the reception of signals from a probe at another star. However, it is necessary to hold the receiver craft in line with an extremely high degree of accuracy. We consider various mechanisms for assisting the receiver craft to maintain a tight lock on the signal, including the use of multiple antennas on the distant probe and the receiving craft. We suggest an interstellar precursor mission that would enable these mechanisms to be tested.





Solar Sail Technology for the Icarus Interstellar Mission

20 07 2010

The proceedings for the International Symposium on Solar Sailing 2010 are now available for download.

My paper starts on page 69, but you can also download just my paper here:

Solar Sail Technology for the Icarus Interstellar Mission [PDF]





Stellar Distributions: A Rule of Thumb

2 05 2010

When designing starship concepts, it’s very useful to have a rough idea of how many stars are reachable within a particular radius of Sol. I’m a huge fan of back-of-envelope calculations (and the related field of Fermi problems), so I’m always keen to generate simple rules-of-thumb that can be deployed when sketching out designs, without having to refer to complex messy real-world data. (Of course, it is still necessary to check against the real data later, once the concept has been sketched.) Read the rest of this entry »





Common Hope: naming symmetries for charity

15 04 2010

Marcus du Sautoy, professor of mathematics at Oxford University, is raising money to improve educational opportunities for impoverished Guatemalan children.

In return for a donation of at least £10, Marcus will name a hyperspace symmetry object after you (or someone else). He’ll even weave four numbers of your choice (for example, a birth date, or another date of significance) into the symmetry object!

Donation Page

Marcus du Sautoy’s Finding Moonshine blog





International Symposium on Solar Sailing 2010

4 04 2010

I will be presenting a paper at the International Symposium on Solar Sailing in New York City, 16:15EDT 22 July 2010.

Project Icarus: Solar Sail Technology for the Icarus Interstellar Mission

Project Icarus is an in-depth theoretical engineering design study of a mission to another star, following on from the historically successful Project Daedalus. While the terms of reference for the project specify that the spacecraft propulsion system will be mainly fusion-based, aspects of the mission and overall architecture could be implemented or assisted by the use of solar sails. This discussion paper gives a brief overview of the aims of Project Icarus, and examines the potential application of solar sails in several areas of the mission. This includes: assisted boosting of the Icarus probe out of our solar system; deploying sub-probes in the target solar system for exploring local planets and other objects of interest; deploying a relay station at the Sun’s gravitational focus to receive transmissions from the distant Icarus craft. This paper discusses some of the engineering requirements for these potential roles as well as any potential performance enhancements to the mission.





Portable Tools for the Starship Engineer

2 04 2010

I quite often find myself doing a bit of work on Project Icarus while travelling. There are several iPhone apps that I find invaluable because they enable me to get on with some useful work without requiring access to a desktop or notebook computer.

Read the rest of this entry »





Eilene Galloway

24 03 2010

In support of Ada Lovelace Day (2010-03-24), I am writing about Eilene Galloway, an amazing woman who was instrumental in the creation of NASA. Read the rest of this entry »





Using the Sun’s Gravitational Lens for Interstellar Communications

22 03 2010

My new blog article has been uploaded to the Icarus Interstellar site:

Using the Sun’s Gravitational Lens for Interstellar Communications





Of Icarus and Caution

20 02 2010

Whenever I mention to someone that I’m working on Project Icarus, a multi-year endeavor to design a starship that improves upon the original Daedalus concept of the 1970s, the almost-inevitable response is along the lines of “Oh, you don’t want to call it that! Icarus fell into the sea!”

That’s quite true, but Kelvin Long, the project lead on Icarus, has highlighted a wonderful quote from Arthur Eddington’s 1927 book Stars and Atoms which nicely sums up my feelings on the matter too.

In ancient days two aviators procured to themselves wings. Daedalus flew safely through the middle air and was duly honoured on his landing. Icarus soared upwards to the sun till the wax melted which bound his wings and his flight ended in fiasco. In weighing their achievements, there is something to be said for Icarus. The classical authorities tell us that he was only “doing a stunt”, but I prefer to think of him as the man who brought to light a serious constructional defect in the flying-machines of his day. So, too, in Science. Cautious Daedalus will apply his theories where he feels confident they will safely go; but by his excess of caution their hidden weaknesses remain undiscovered. Icarus will strain his theories to the breaking-point till the weak joints gape. For the mere adventure? Perhaps partly; this is human nature. But if he is destined not yet to reach the sun and solve finally the riddle of its constitution, we may at least hope to learn from his journey some hints to build a better machine.





Making Marmalade

27 01 2010

A lesson in marmalade making will come as a boon…
First slice the orange over a bowl with a spoon.
Collect the juice! but leave the pith behind.
Put flesh, the juice and pips in a mixer and grind;
When smooth, then push the purée through sieve into pan.
Now scoop the pith from the shells as much as you can.
Then slice the rind to strips as thin as a match,
And add them to sieved flesh (mix all into one big mishmash).
Add lemon and water, and simmer until the rind’s soft;
It takes an hour or two, as often as not.
On low heat, add sugar and stir ’til the sugar’s dissolved,
And bring to the boil, skimming the froth to a bowl.
Take samples to fridge; when jellied, the conserve’s at par!
Then extract, and pour into clean and cool jars.

Rabbit Hole Day