[Canberrauav] Hybrid Hex cleanup

James Pattison james at auturgy.com.au
Sat May 2 16:10:45 AEST 2015


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
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