[Canberrauav] Tflightech hybrid hex

James Pattison james at auturgy.com.au
Sun May 3 14:05:27 AEST 2015


Or NASA, with this in the works:

http://en.m.wikipedia.org/wiki/NASA_GL-10_Greased_Lightning

Regards,

James

> On 3 May 2015, at 11:29, Peter Morris <peter.morris at greenpeace.org> wrote:
> 
> um, 
> 
> I dunno if you guys have looked at it, but these ex-MIT chaps  claim to have a 1500mm hex with 2 hour endurance carrying a 10kg payload, run by their  4kg  petrol generator putting out 1800 or 5000 watts.
> 
> http://www.tflighttech.com/products.html
> 
> cheers
> 
> p
> 
>> On 2/05/2015 10:08 PM, Jack Pittar wrote:
>> Scaling down to 60 size means the aircraft can barely lift itself. If it was successful, what would this prove?
>> Duplicating the drivetrain? We know an all electric drivetrain will not make the distance. A petrol only drivetrain means helicopter mechanics which is what we already doing, so this is no longer an alternative.
>>  
>>  -----Original Message-----
>> From: James Pattison [mailto:james at auturgy.com.au]
>> Sent: Saturday, 2 May 2015 4:11 PM
>> To: Grant Morphett
>> Cc: Jack Pittar; canberrauav
>> Subject: Re: [Canberrauav] Hybrid Hex cleanup
>> 
>> I think we should start with a smaller proof of concept.
>> I'm not sold on this idea at all, and need some convincing that adding so much dead weight/drag by duplicating the drivetrain has advantages over a tilt rotor or tilt wing.
>> A concept demonstrator may provide some confidence.
>> 
>> Regards,
>> 
>> James
>> 
>> On 2 May 2015, at 12:26, Grant Morphett <grant at gmorph.com> wrote:
>> 
>>> Are we thinking of doing a smaller prototype first with a bixler or something or just jump right into the big one?
>>> 
>>> Thanks, Grant.
>>> 
>>>> On 1 May 2015 at 18:03, Jack Pittar <jpittar at bigpond.net.au> wrote:
>>>> 
>>>> Ah ..yes. I forgot the speed controllers. That makes it $510.
>>>> This pricing is just a quick add up of the basic parts without any close
>>>> study of them.
>>>> Built in spares were not considered, but would be in any purchase because
>>>> you can not always get repeats of the same item a few weeks later.
>>>> The receiver, telemetry, pixhawk, battery, switches, wiring and connectors,
>>>> etc etc are all considered to be part of the plane.
>>>> Also not included are the carbon fibre tubes or hardware to mount the motors
>>>> etc.
>>>> Jack.
>>>> 
>>>> 
>>>> The list:
>>>> 4 off Red Brick speed controllers, OPTO, 125 Amp, 2~7S - $37.48 each.
>>>> 4 24X8" props - $26.59 each.
>>>> 4 off G46-420 motors - $63.56
>>>> 
>>>> -----Original Message-----
>>>> From: James Pattison [mailto:james at auturgy.com.au]
>>>> Sent: Friday, 1 May 2015 12:58 PM
>>>> To: Jack Pittar
>>>> Cc: canberrauav
>>>> Subject: Re: [Canberrauav] Hybrid Hex cleanup
>>>> 
>>>> 
>>>> Are you sure on the costs?
>>>> What motors/esc's have you picked (a giant quad for under $400 would be
>>>> awesome!).
>>>> 
>>>> Regards,
>>>> 
>>>> James
>>>> 
>>>> > On 1 May 2015, at 12:03, Jack Pittar <jpittar at bigpond.net.au> wrote:
>>>> >
>>>> > The following is to clean up the discussions on the Hybrid Hex.
>>>> > Thanks to all for your interesting discussions.
>>>> > After lots of fiddling around with different physical formats, I have
>>>> settled on the following for the prototype:
>>>> > A 2.2 metre wingspan ARF model - the MaxiLift or Porter - will have a fore
>>>> and aft boom fitted to each wing. Each boom will have motor and 25"
>>>> horizontal propeller mounted on each end, making a traditional quad.
>>>> > The horizontal stabilizer will be moved to the top of the vertical
>>>> stabilizer for clearnce of the quad propellers.
>>>> > The motor will be a standard tractor mounted 40cc petrol twin (because I
>>>> already have it).
>>>> > A tricycle undercarriage will be fitted to allow normal aircraft takeoffs
>>>> and landings.
>>>> > The intention for the prototype is to experiment with the aircraft
>>>> handling in vertical and horizontal flight and in transitioning, beginning
>>>> at the minimum weight of 13Kg.
>>>> > The cost and size of the quadcopter parts, to make the aircraft operate as
>>>> calculated for in eCalc, were a significant roadblock. This was cleared when
>>>> Stephen pointed out that the quadcopter components only have to lift and
>>>> maneuver. The Hobby King cost of these parts will be $360 without batteries.
>>>> One 5Ah 6 cell battery ($105,0.85 Kg) is eCalc'd to bring a hovering and
>>>> maneuvering time of 2 minutes or so. 5 batteries, 8 minutes.
>>>> > The requrement to have all propellers stopping will be dealt with later.
>>>> > With thanks particularly to Ben and Daniel, the generator concept sounds
>>>> quite feasible. It would save on making a mechanical clutch mechanism at the
>>>> expense of making a synchronous rectifier and power controller. Depending on
>>>> conversion efficiencies, a bigger engine would probably be required if it is
>>>> to allow for continuous hovering and maneuvering.
>>>> > Rather than a "Hybrid Hex" I suppose it should be described as a
>>>> "Quad-plane Hybrid".
>>>> > A good name for it would be the "Vampire", although that name should be
>>>> reserverd for whichever aicraft we take to the OBC.
>>>> > Jack.
>>>> >
>>> 
>>> 
>>> 
>>> -- 
>>> Thanks
>>> 
>>> Grant
> 
> -- 
> currently in Australia
> phone: +61 (0)401909069
> skype: peter.morris  (GP and MSF)
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