Hi,

C-astral wings (website) are identical to the wing X8 Skywalker (or the opposite!), but the perfomance are very different. What could double performance of the c-astral? The outer covering (composite or carbon)? The motor / prop combination? My goal is to create a similar astral-c wing, long flight endurance, tilt&pan camera or a lightweight sony alpha like a5100, parachute for landing and a Pixhawk (their mission planning software looks suspiciously like Mission planner anyway!)



Thanks everyone

Alex

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Identical....

... really... ;)

Looking at the C-astral wings, they are composite, whereas the Skywalker X8 is EPO foam.

Differences that I can see just from looking at comparative photo's, the wing aerofoils (airfoil for those of you located the wrong side of the Atlantic ;) are total different, the X8 will weigh more, nett result the X8 requires more thrust to stay aloft = less endurance than the C-astral. 

The C4-EYE claims to have 3hr endurance, in optimum conditions with a light payload this is not unbelievable.

An hour for the X8 is probably the most cost effective flight time as it does not make a good glider, hence will have to be under power more often than not. Using an optimised prop/motor and LiPo combination should see 1hr flights easy enough, but the weight of batteries needed to achieve a 3hr flight combined with the APM and ancillary gear could not be carried by the X8!

If you specifically want endurance, consider a Techpod or similar.

With the X8, you certainly get a 'lot' of plane for your £/$, but IMHO ultimately it is a compromised design - and it certainly can't hope to compete with bespoke composite platforms like the C4-EYE.

 

Hi Kev and thanks for the relpy,

You're right, there are not the same, but pretty similar.

I know the "C4-eye" is really impressive, but it is between $ 50k and $ 100k and I do not need all the accessories.
 Knowing that the market is actually at the beginning and that the applications are still nebulous, invest $ 75k would be quite risky.

You say apm is not optimized for long flights, why? Yet C-Astral mission planner looks (very similar;)) like Mission planner / apm planner!


Do you think that building a composite mold for an existing model (X8, FX79) would be a good option (not knowing how much costs a mold!)


Thank you again
I will continue to search the forums.

Alex from Montréal

Hi Alex. 

We have a flying wing that is smaller than the C-Astral but is full composite and suitable for the Pixhawk. It's already setup for parachute installation with a mechanical deployment hatch.

aviounmanned.com

What are you looking to do, create a drone for yourself or build and sell them for others? 


--
Avio Unmanned Team 

Hi to Avio team and thank you for your reply,

wow, it's very similar to the UAV C-Astral, it is impressive.

Is it possible to put a larger battery for more endurance or the space dedicated to the lipo is specially made for a 3S / 3000mah?
I also see your UAV X, very interesting too.


Could you send us a quote to know the prices and options available for your two machines?

You can send it to admaltaisATgmailDOTcom

thank you
Alex

Hi Alex. 

There is nothing stopping you installing a larger battery if you desire, just keep in mind it will effect your payload capabilities as this airframe was not designed for heavy lift applications. 

What are you looking to carry for your missions? 

I'll send you an email with some pricing. 

Can you guys please advise on the sky walker platform . I have two which cannot cope with above 14 mph winds , well when I say can,t cope I mean they have the hadit of spiralling out of control when doing a tight turn which it will not recover

Hola a todos, estamos desarrollando un concepto de seguridad para el skywalker x8 y otros drones de ala fija, que les dan mayor precisión y rendimiento, además de proteger el equipo en el momento del impacto. Este sistema tiene cardán, baterías de alta duración de 120 minutos y paracaídas. ¿Qué piensas de nuestro trabajo? Saludos

Hi Alex,

You can source a composite X8 from Skywalker themselves. They released the composite X8 towards the end of last year, if memory serves. I recall that the wiglets pointed down... You can search the site, I'm sure you'll find the discussion.

My point is that getting a commercially proven air frame like the X8 and matching it with the right battery/motor/prop combo for your payload using a tool like ecalc will remove a lot of the painful trial and error.

Good luck with your mission.

Here is the link to the discussion:

http://diydrones.com/profiles/blogs/skywalker-x8-honeycomb-composit...

I got 2h17m and 114km with a Super Skysurfer with an un-aerodynamic gimbal and a weight of 3KG. I suspect that with the same battery/motor combo an X8 would have easily gone further/longer as flying wings are quite a bit more efficient with lower drag than a conventional layout.

How much further/longer - maybe 2h45m/150km, perhaps even 3hrs? It is possible with the X8 and conventional motors/props/ESC's.

One just has to choose carefully and optimize each component.

At these Re numbers really the only thing that is going to matter is your propulsion system efficiency, and whether or not the airframe can support the load structurally. With the same propulsion system, wingspan and structural capacity the two drones would almost certainly perform within 10% of each other range wise. 

Hi Graham.

I'm building an X8 that requires at least 90min  flight time.

AUW would be around 4.4kg

Battery would be 16000 6C 15

What prop and motor would you recommend.

Using Pixhawk 2.1 cube.

Many help would be muchh appreciated.
 
Graham Dyer said:

I got 2h17m and 114km with a Super Skysurfer with an un-aerodynamic gimbal and a weight of 3KG. I suspect that with the same battery/motor combo an X8 would have easily gone further/longer as flying wings are quite a bit more efficient with lower drag than a conventional layout.

How much further/longer - maybe 2h45m/150km, perhaps even 3hrs? It is possible with the X8 and conventional motors/props/ESC's.

One just has to choose carefully and optimize each component.

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