SCIENTIFIC USES FOR HELIKITE AEROSTATS

Deployable within seconds and capable of long-duration, all-weather flight to thousands of feet. They are lightweight to transport, easy to understand and fly. They are very steady platforms in foul weather, have a tiny footprint and only ever need one or two people in any weather. They are able to raise scientific measurement equipment to great heights.

Helikites are used by thousands of customers worldwide for varied applications including: Aerial Photograpy, Ad Hoc Radio, Weather Research, Lifting Equipment, Surveillance, Amateur Radio, Agriculture. Helikites can get larger payloads flying higher, faster, easier.

• Designed to lift considerable payloads to higher altitudes than is possible with any other similar sized aerostats. Skyhook Helikites are classified according to how many cubic metres(cu m) of helium they hold. As a general rule, at standard, temperature and pressure, a Skyhook Helikite can carry about a kilo of payload for ever two cubic metres of helium capacity. Obviously, the weight of the required length of line must be taken into account.

ADVANTAGES OF HELIKITE AEROSTATS

1. HELIKITE SIZE & DESIGN

   Helikites are semi-rigid and exploit powerful wind lift as well as helium, so a Helikites of only 11 cubic metres can fly thousands of feet high in no wind, or in in gale force winds,  and can stay at high altitude unattended for weeks. Helikites are blown up by the wind. They have an excellent helium volume/lift ratio due to their rounded shape combined with powerful aerodynamic uplift for extra performance. Numerous attachment points are available to attach diverse payloads.

2. PERSONNEL REQUIREMENT
   

   Ground handling normal large blimps can be a nightmare in winds over 30 mph.  Helikites are different. Even tiny Helikites can fly in higher winds and to higher altitudes than normal blimps, so Helikites do not need to be large to be all-weather. Therefore as payloads become smaller and lighter due to advances in technology, it makes sense to use Helikites to lift them. 
   
   Ground handling Helikites is very easy. Helikites under 20 cubic metres can easily be man-handled by one or two people in high or low winds. Helikites of 20 cubic metres upwards are used with an inflatable Helibase which enables their inflation, deflation, launch, flight, and recovery to happen in almost any weather conditions, by only one trained operator - although two is slightly quicker. 
   
   Helikites can even be launched and recovered remotely - with no people present at all. They are simply winched off or onto the Helibase. This is possible because Helikites derive much of their stability from gravity which is always constant even when the Helikite is in difficult ground winds. As the Helikite approaches the ground, the bouyant balloon at the front of the Helikite and the aerodynamic lift caused by the speed of winching, keeps the front up - thus keeping it out of danger. The back end of the spar is the only thing that may touch the ground and it is protected for this purpose. All the recovery is done via remotely operated winches. Nobody need to go near the Helikite until it is safely pulled firmly onto the Helibase.

3. SPEED OF DEPLOYMENT
   
   Instant deployment is the ideal. This can never be achieved by a normal blimp aerostat that needs to be inflated prior to use. It always takes a few minutes to inflate a blimp and often some hours for the larger ones. The size of normal blimps precludes them being transported fully inflated. A blimp small enough to fit inflated in a road trailer is not generally able to cope with more than light winds. 
   
   However, unlike normal blimps, Skyhook Helikites of 5 cubic metres or less are small enough to allow them to be kept fully inflated in a small road trailer allowing instant deployment (See products section). These small Helikites are able to fly steadily to altitudes of thousands of feet in winds up to 45 mph.
   
   Larger Helikites cannot fit in a road trailer when inflated, but they are still have a far smaller footprint than an equivalently performing blimp and are much faster to deploy. The Helikite can be safely deployed within 20 minutes, by two people, from the top of a road trailer capable of being pulled by a SUV. It is designed to provide mobile emergency communication relay. 
   
   The new Cased Helikite Aerostat Maintainable Platform (CHAMP) (see products section) allows the deployment of a 10 cubic metre Skyhook Helikite within 30 minutes. The unique part of the CHAMP is that it also includes an excellent Helibase with top cover thus also creating a permanent, safe base for the Helikite - not just a minimal launch platform.
   
   
4. WEATHER DEPENDENCY
   
   

   Normal blimp aerostats are not good in high winds at altitude but they are even worse near the ground. So their practical wind limits are often far lower than is apparent from reading their technical specifications.  As a precaution they normally are intentionally grounded when the wind speed approaches the ground-handling speed, as opposed to the much higher flying speed as a precaution.

   Helikites are designed for foul weather deployment and foul weather flight. Even the largest Skyhook Helikites can be launched and retrieved in all the winds that they can fly in. So deployment and flight can occur safely in winds up to 50 or 60 mph.
   
   
5. GROUND FOOTPRINT
   
   

   This means the equipment needed, and the space on the ground, to transport, inflate, launch, recover, deflate and store the aerostat. Large aerostats need large footprints - especially long, thin blimp aerostats. This is because their large surface area to volume ratio, and their need to be big to cope with wind, means they need far more helium than Helikites per kilo of payload. Helium is very heavy to transport because is does not compress to a liquid at room temperature, but only to a compressed gas in relatively heavy high pressure cylinders. So compressed helium cylinders are very large per cubic metre of useable gas compared to cylinders of carbon-dioxide or oxygen that can be compressed to a small volume of liquid.
   
   The ground footprint of an all-weather Helikite is minimal. The C.H.A.M.P. is a self-contained tactical aerostat system with a 10 cubic metre, Skyhook Helikite, Helibase, hand-winch and enough helium cylinders to give months of flying all contained within one 4ft x 4ft x 4ft palleted container weighing only 190 Kg. One person can easily set it up. The heaviest piece of equipment within the container only weighs 15Kg so the load can easily be split up and back-packed.  The resting Helikite is not effected by the wind and so does not need to rotate and thus needs minimal space. The 10 cubic metre Skyhook Helikite is a superb aerostat, able to fly to thousands of feet in winds up to 50 mph lifting a payload of 5kg. It will cope with far higher winds than blimps many times its size and yet is small enough to be quickly winched in or out with a simple, lightweight, robust hand winch - that requires no heavy engine, flammable fuel or expertise.

6. MOUNTAIN USE
   
   

   Aerostats are often required to be used in mountainous areas where the starting altitude is 5000ft or higher. Air is thinner at high altitudes and so helium lift is reduced and cannot support such payloads for a given volume. This affects all aerostats but the problem is far less with Helikites because Helikites are rounded compared to normal long-thin blimps and so Helikites have a better surface area / volume ratio. Also the wind lift that Helikites can exploit is vital to cope with catabatic winds, thermals and other difficult airs around mountains. Helikites perform far better than normal blimps at high altitude.