I would like to hear people's thoughts on the size range of these vehicles, and if anyone here is testing larger or smaller craft than what is typically seen here.

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There's a variable pitch model using 450 sized parts and 2x600 motors around here somewhere. It's pretty large and impressive! There's also a blog post on a 1:1 quad if you go a few pages back. And, of course you've seen the smaller-than palm-sized models some of the universities have "on hand". The range is quite diverse, I think!
I've been playing around with the idea of 3 meter by 3 meter quad using 2 ft tail rotor blades a custom head assembly with variable pitch and variable conning angle shaft driven with clutches and an 80 hp motorcycle powerplant... Awww nothing like a quad that conceptually u could fly in if u were crazy enough lmao it would be a 200lber without payload
I had wondered why someone hadn't already scaled up the technology and build a version to carry a human payload.

If the quad could also fly as a tri copter then that would offer better redundancy than something like this:-


The fact that there are people willing to buy these "fan packs", could mean there's a market for something a bit safer, like a big Quad = )
a quad is not safer than this "jetpack"
in fact the jetpack is safer
if one motor fails on a quad it crashes, no possibility to fly as tricopter

you can build a hexa ;)
An off-the-shelf quad doesn't fly as a tri copter, but I bet 3 motors can stay in in flight a lot longer than none, or one - whatever the "fan jet" redundancy includes.

I think a hexa is getting a little bit cluttered, but it would be a safer option that the "fan jet" and hence there could be a market interested in buying them.

The Martin fan jet generated a lot of interest, publicity, and investment, which goes to show that people can be inspired by a new coat of paint on a not so new concept = )
show me a quad which stays in the air with only 3 motors running!
it just flips over if one motor stops spinning, nothing else
It will not necessaryly flip over if has variable pitch and enough power to stay airborne with two motors. I am not saying it is easy, but maybe not impossible...

show me^^
it _will_ definetly flip over because it's center of gravity is on the axis of 2 motor but one other motor is pushing up next to this axis -> it will turn this axis
So it'll spin slowly to the ground rather than crashing down like a rock.

An "off-the-shelf Quad" can't fly like a tri copter, but I bet its possible to make a custom Quad that can.
no it will spin on the X-Axis -> it flips upsite down -> it will crash into the ground, not falling, crashing!
An off-the-shelf Quad might spin on its X-Axis, but a "custom" Quad built to behave like a tricopter wouldn't.
One large prop is more efficient than n smaller props; The advantages of a quad are the simplicity and efficiency of direct drive motors juxtaposed against the complexity of a cyclical etc. These advantages are presumably lost as the cost and size of the vehicle goes up. Your fixed pitch quad rotor of any size will crash, and with it whatever you carry; an adj. pitch rotor on the other hand allows for a dead stick landing, so your odds go up.

I suspect someone will build an n rotor with sufficient props to lift a human (~50-70)? and such may be safely redundant, but arguably a heli would be more effecient. (however, might it be oddly quiet - having a high frequency and lacking the main source of whoop-whoop (the tail crossing)?

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