Comment by Sebastian Gralla on July 12, 2011 at 2:17pm

why would you want 4 motors AND 4 servos?

the only advantage of a variable pitch quad is that you only need one motor

Developer Comment by John Arne Birkeland on July 12, 2011 at 2:21pm

I think that it has the potential to fly well and be very efficient in flight.

But... One of the main reason people started experimenting with quads is that they are mechanical simpler then a helicopter. And much cheaper and easier to build. If you are willing to put up with the complexity and expense of using helicopter parts, then there is no need for a quad. If we are honest a helicopter flies better, has better efficiency, more lift and is more stable then a quad. Especially in bad weather conditions.

Moderator Comment by John Church on July 12, 2011 at 2:51pm

"the only advantage of a variable pitch quad is that you only need one motor"

And instant reaction to control input. Not that a "plain" quad takes long, but there is a difference.

Comment by ionut on July 12, 2011 at 2:59pm

This is not my quad, I just saw it on some rc forum for sale and I've disscused with the owner.I'm not sure if this thing works but I wanted to share with you a simpler method of building such a quad, by using heli parts.I do have some close up pictures but I will not make them public for the moment(I have to ask permission first).I plan to make my own at some point.

Comment by Sebastian Gralla on July 12, 2011 at 3:22pm

"And instant reaction to control input."

i thought that ESCs react faster than standard servos, don't they?

Comment by A. Rafael Ptacnik on July 12, 2011 at 10:06pm

explain this quad in reference to the word "Performance" :-)

Comment by ionut on July 12, 2011 at 10:45pm

Well, one advantage for this particular quad is the monster "performance".It can carry 20kg and can hover for 40 min based on how many batteries you use.Maybe one of the advantages iare his dimensions,by allowing some huge propellers.Those huge propellers are easier to pitch than accelerate.

Comment by fibrewire on July 12, 2011 at 11:57pm

Currently building a variable pitch quad - yes changing pitch is a lot simpler than ramping the speed up and down. If you disagree, then come back to me when you can stay in the air for more than one hour.

Comment by fibrewire on July 13, 2011 at 12:07am

Performance - capable of producing complex aerobatic manuevers beyond even the most skilled Trex helicopter pilot. A properly designed VPQR will be able to do more than what the guys at G.R.A.S.P. can do with their quads.

http://www.youtube.com/watch?v=QDKluaBoXFU

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