Replies to This Discussion

ModeratorPermalink Reply by John Church on September 10, 2010 at 8:23am

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!

• ▶ Reply

Permalink Reply by Alan Schimmel on October 15, 2010 at 10:42am

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

• ▶ Reply

Permalink Reply by John Ryan on October 15, 2010 at 4:38pm

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:-

http://www.martinjetpack.com/

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 = )

• ▶ Reply

Permalink Reply by Sebastian Gralla on October 16, 2010 at 1:55am

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 ;)

• ▶ Reply

Permalink Reply by John Ryan on October 16, 2010 at 4:00am

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 = )

• ▶ Reply

Permalink Reply by Sebastian Gralla on October 16, 2010 at 4:48am

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

• ▶ Reply

Permalink Reply by Magnus on October 16, 2010 at 7:04am

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...


Magnus

• ▶ Reply

Permalink Reply by Sebastian Gralla on October 16, 2010 at 7:31am

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

• ▶ Reply

Permalink Reply by John Ryan on October 16, 2010 at 11:57am

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.

Permalink Reply by Magnus on October 19, 2010 at 5:07am

Well, As i said it requires variable pitch. If one motor stops the opposite motor will only be used for balancing by changing pitch.

the two remaining motors must be able to lift the entire weight.

/Magnus

Permalink Reply by Sebastian Gralla on October 16, 2010 at 1:44pm

no it will spin on the X-Axis -> it flips upsite down -> it will crash into the ground, not falling, crashing!

• ▶ Reply

Permalink Reply by John Ryan on October 16, 2010 at 6:21pm

An off-the-shelf Quad might spin on its X-Axis, but a "custom" Quad built to behave like a tricopter wouldn't.

• ▶ Reply

• ‹ Previous
• 1
• 2
• Next ›
• Page