LOHAN must suck juice while mounted on rigid rod - but HOW?

Possible hot coupling for Vulture 2

  • alert
  • submit to reddit

Remote control for virtualized desktops

Over the past couple of weeks, the Low Orbit Helium Assisted Navigator (LOHAN) team has been chewing the fat with readers over just how to hook up the Vulture 2 spaceplane's rocket motor heater.

Click here for a bigger version of the LOHAN graphic

There's more on the current state of play with the heater right here, and a roundup here of your suggestions for connecting the thing to its 12V battery in a way that isn't going to impede our aircraft's launch.

We've got plenty of options on the table, and the jury's still out on a final decision. My personal preference is for a magnetic solution, although plenty of you favour mechanical coupling, such as sprung metal strips.

While we mull, we're still considering new proposals, and this one from StampedChipmunk caught our eye:

I may be missing something but why not use the blast plate for the power transfer?

Instead of it being one piece of aluminium, why not have it split electrically in two (perhaps a chunky circuit board with two big pads) and then have two spring loaded copper pads (use biro springs) in the rear of LOHAN that then transfer the power to the heater (with the whole thing being held in the rear of the plane, which makes for easier wiring).

So long as Lohan remains in contact with the blast plate, the power should be transferred. The only difficulty I can see is if Lohan slides away from the blast plate during her ascent, but this would also affect the performance of the rocket motor so may have already been solved... In fact the contact pads may actually help protect Lohan from any lateral buffeting she may receive during the ascent...

Stoneshop responded:

I was just thinking along the same lines. As Lohan's guide rod is supposedly pointing heavenwards, the craft itself will 'lean back' against the launch plate. With a pair of springs mounted there pushing against contact pads on Lohan's posterior, you should get good enough contact to run the 0.2A the heater requires.

Well, it's an ingenious idea, but sadly it doesn't have legs. Since the elite Southampton Uni Vulture 2 design team offered a first peek of the spaceplane's design, we've been able to update our launch system concept graphic and LOHAN mission summary to better reflect how the thing will actually work:

Revised graphic of our Vulture 2 launch system

To summarise for LOHAN newbies, the Vulture 2 "hangs" on a titanium launch rod which passes through two aluminium plates attached to the carbon fibre fantastical flying truss.

This allows the aircraft to rock slightly on the ascent, preventing it freezing to the rod. Teflon strips (most likely backed by foam, not shown) run longitudinally along the underside of the truss, preventing the wings hitting the truss during ascent and launch. Note that while the rough planform of the Vulture 2 seen above doesn't show wingtip rudders, rest assured the finished article will indeed boast these vital stabilisers.

Our improved graphic shows how the titanium rod and the Vulture 2 sit as close to the underside of the truss as possible; we've lowered the Teflon strips to minimise the gap between them and the wings.

The above pic is not to scale, and how it finally goes together depends on the finished spaceplane. We do, though, have the basic truss assembled from a 12.5mm carbon-fibre rod, held together with off-the-shelf fittings and mighty Scotch-Weld 2216 Epoxy.

Here's a photograph of the constructed carbon-fibre flying truss, with a close-up of the joints inset:

Our carbon fibre flying truss constructed

One critical component of the launch rig is the rubber pad that stops the Vulture 2 doing itself some damage against the fore aluminium plate. Here's a rough diagram of how that will work:

Diagram of the Teflon insert in relation to the Vulture 2 fuselage, and titanium rod, with rubber pad and aluminium plate shown

There's a Teflon insert in the plane's upper fuselage, through which the titanium rod passes. The conical shape is to make sure the forward motion of the aircraft doesn't rip the insert out. The 1mm gap ensures the plane doesn't jam on the rod*.

The aircraft isn't, therefore, in contact with the aluminium plate. Although we could use the plate to conduct 'leccy from the battery to the heater, that would require a hookup from the plate to the aircraft, and that offers no advantage over using a couple of wires.

So, we'll continue to explore workable heater hookup options, and let you know how we get on. In the meantime, your input is, as always, warmly welcomed. ®


* In case you're concerned that ice may build up in the gap between the insert and rod, tests have shown that a liberal application of Molykote 33 low-temperature grease addresses that problem. Even with a test steel rod and insert half encased in ice, the grease prevented the formation of large water crystals.

Further LOHAN resources:

  • New to LOHAN? Try this mission summary for enlightenment.
  • You can find full LOHAN coverage right here.
  • Join the expert LOHAN debate down at Reg forums.
  • All the LOHAN and Paper Aircraft Released Into Space (PARIS) vids live on YouTube.
  • For our SPB photo archive, proceed directly to Flickr.
  • We sometimes indulge in light consensual tweeting, as you can see here.

LOHAN - A Special Projects Bureau production in association with...

  • 3T RPD logo
  • University of Southampton logo
  • Applied Vacuum Engineering logo
  • Escher Technologies
  • Flashpoint Fireworks logo
  • HAB Supplies logo
  • Rock 7 logo

Paper Aircraft Released Into Space

Beginner's guide to SSL certificates

More from The Register

next story
Rosetta probot drilling DENIED: Philae has its 'LEG in the AIR'
NOT best position for scientific fulfillment
'Yes, yes... YES!' Philae lands on COMET 67P
Plucky probot aces landing on high-speed space rock - emotional scenes in Darmstadt
HUMAN DNA 'will be FOUND ON MOON' – rocking boffin Brian Cox
Crowdfund plan to stimulate Blighty's space programme
THERE it is! Philae comet lander FOUND in EXISTING Rosetta PICS
Crumb? Pixel? ALIEN? Better, it's a comet-catcher!
SEX BEAST SEALS may be egging each other on to ATTACK PENGUINS
Boffin: 'I think the behaviour is increasing in frequency'
Post-pub nosh neckfiller: The MIGHTY Scotch egg
Off to the boozer? This delicacy might help mitigate the effects
I'M SO SORRY, sobs Rosetta Brit boffin in 'sexist' sexy shirt storm
'He is just being himself' says proud mum of larger-than-life physicist
NASA launches new climate model at SC14
75 days of supercomputing later ...
prev story


Choosing cloud Backup services
Demystify how you can address your data protection needs in your small- to medium-sized business and select the best online backup service to meet your needs.
Getting started with customer-focused identity management
Learn why identity is a fundamental requirement to digital growth, and how without it there is no way to identify and engage customers in a meaningful way.
High Performance for All
While HPC is not new, it has traditionally been seen as a specialist area – is it now geared up to meet more mainstream requirements?
The Heartbleed Bug: how to protect your business with Symantec
What happens when the next Heartbleed (or worse) comes along, and what can you do to weather another chapter in an all-too-familiar string of debilitating attacks?
Storage capacity and performance optimization at Mizuno USA
Mizuno USA turn to Tegile storage technology to solve both their SAN and backup issues.