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12-14-2008 06:06 PM  8 years agoPost 1
Choppershots2

rrNovice

In the air I hope!

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Looking in to ap with one of these machines. I have found several on Youtube flying but they don't look very stable.

Are any of you flying any of these copters doing AP? If so any idea where to find a very stable machine at a price that won't break the bank. My funds are under $7000 for a copter that really works.

Thanks for the help. Have looked every where I could think of with not much luck.

It's not I'm against helicopters just want to go in a different direction.

Ron

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12-14-2008 06:24 PM  8 years agoPost 2
daytonabeach

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Oslo, Norway

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I havent, but i find them very limited in use, and expensive, it cant usually lift more than 500gr, and its not very resistant to low temps, at least not the expensive ones, dont remember the most known supplier there at the moment, but i was disappointed over the usage it had compared to the awfully high price..

Never argue with an idiot, he'll drag you down to his level and beat you with experience...

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12-14-2008 07:55 PM  8 years agoPost 3
UHC - PORTUGAL

rrApprentice

LISBOA

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Contact Volovisione. They are selling one of the Quadrotors.

They have also a lot of experience flying these systems as professional AP/AV tools.

Whatch them!!

http://www.volovisione.com

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12-14-2008 08:06 PM  8 years agoPost 4
Choppershots2

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In the air I hope!

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Thanks for the info. Was hoping for a bigger unit but it's a start.
Emailed them to find out a price.

I found one on Youtube once I can't seem to find again that was lifting 6 pounds of payload. Hoping to buy that type of system.

Ron

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12-15-2008 12:33 AM  8 years agoPost 5
wxyz

rrApprentice

calif*, U know where

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Most of the quad rotors R still being scratch built. The technology exists to mass produce a very stable quad rotor for less than the cost of a unirotor but no-one is. It only costs $1000 to build a fully autonomous quad rotor. Increasing the payload is a matter of finding a more powerful motor & propeller combination.

Main quad rotor suppliers.

http://www.mikrokopter.de/ucwiki/
http://microdrones.com/
draganfly.com

You can see the current level of stability from this video. They can be more stable than a T-Rex 450. They're stable enough to take off & land autonomously. The flight time is slightly shorter than unirotors. They don't have tail rotor weather vaning in high wind. They're super quiet.

Watch at YouTube

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12-15-2008 04:19 PM  8 years agoPost 6
daytonabeach

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Oslo, Norway

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They seams almost impossible to hold still..

Never argue with an idiot, he'll drag you down to his level and beat you with experience...

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12-15-2008 04:55 PM  8 years agoPost 7
UHC - PORTUGAL

rrApprentice

LISBOA

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I saw one flying when i was in Milan with Volovisione team, and i was impressed with the capability of the Quadcopter´s.

They have takeoff from the ware house (very tight space) they have mantained a very stable indoor hoovering, then moved to outside were a light wind is present and remained a very stable and precise hover outside,..

Then they start flying/ climbing high realy high,..

I was impressed with the stability and also with the power and energy in vertical climbs and also with the speed that the quad copter can travel.

Sorry daytona but i have a diferent opinion, the quadcopter that i have saw is very stable and impressive in speed and energy when necessary,....

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12-16-2008 06:33 AM  8 years agoPost 8
BarryB

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UK + Asia

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I agree with Daytona : those things are great where their small size and safety are an issue - but every video I've seen of one holding position outdoors in any wind is all over the place (especially in altitude).

The fixed-pitch propeller control system can never match a collective pitch helicopter design for stability when the wind is blowing.

I wonder how well the design can be scaled up to a larger machine. I think the added mass (and hence inertia) of the bigger motor on each arm will not help. Once they get dangerous, their big advantage is gone IMHO.

Barry.

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12-16-2008 10:33 AM  8 years agoPost 9
Flyby123

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Indonesia

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http://www.luftbilder.net/mkwind.html

So some assumptions you guys made are not really correct here....

Jimmy

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12-16-2008 11:51 AM  8 years agoPost 10
BarryB

rrApprentice

UK + Asia

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I saw that video a long time ago : like I said, all over the place. I would have been impressed if he took it up to 100 feet and held a reasonably stable hover.

Not in the same league as a regular heli but very impressive for what it is.

Barry.

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12-16-2008 12:03 PM  8 years agoPost 11
Flyby123

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Indonesia

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So regular Heli stays perfectly still in that kind of weather?
Please tell me which one that is.
I will buy it immediately...

I think comparing it to Trex600/ MJ2 with this... is not really fair.
Best comparison would be Trex 450...does that fly more stable especially in that wind?

Jimmy

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12-16-2008 01:51 PM  8 years agoPost 12
catfight

rrKey Veteran

USA

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My question has been what happens with single hardware failure- engine, prop, controller - which are high failure devices. I don't see how you could autorotate to safety from any altitude with low mass propellers. Also, there has to be complex motion with so many unphased devices. I have never flown one but minimal parts count usually means lower failure rate.

What goes up must come around

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12-16-2008 02:08 PM  8 years agoPost 13
Choppershots2

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In the air I hope!

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I had really hoped to get input on a manufacturer that produces a collective pitch model with the ability to auto if needed. Wouldn't consider fixed pitch. I havebeen contacted by a company building snd testing one right now. Will let you know what I find out.

Wasn't trying to start a if the heli is better or worse. I fly helis now just know there has to be a better mouse trap?

Thanks for all the help.

Ron

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12-16-2008 06:20 PM  8 years agoPost 14
fotoman

rrNovice

Washington State

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quad

Hi Ron, you may want to check out this forum as well..lots of smart guys over there.
http://www.rcgroups.com/forums/showthread.php?t=768115

I am building a quad based on that setup, will be testing it later this week and let you know.It cant carry anymore than a small point and shoot but think its going to be fun to learn on. John

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12-16-2008 06:26 PM  8 years agoPost 15
aercam

rrNovice

West Tennessee

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Hey Choppershots2

"I had really hoped to get input on a manufacturer that produces a collective pitch model with the ability to auto if needed. Wouldn't consider fixed pitch."

I think variable pitch rotors are the next evolution in multi-rotor heli's. Funny you should mention a company has contacted you on this. That is good to hear.

I am working on a design right now that uses three rotors. They are all collective and uses gyros and accelerometers for the Stability Augmentation System. Yaw is accomplished using cyclic inputs to the tail. The rotors are all driven by a single motor connected to them using belts or shaft drive and also with a one-way bearing at the motor end so it will have some auto capability.

I am still a bit away from releasing photos of the machine that are worth displaying but will do so when I am farther along.
Jim

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12-16-2008 07:22 PM  8 years agoPost 16
jascamera

rrVeteran

san francisco, ca

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I would love to get one down the line, very versatile. But then so does my 450, very small and compact. And got very good photos and Videos from it too.

But I guess, 450 doesn't have position hold and auto take off.

Jason

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12-17-2008 05:24 PM  8 years agoPost 17
Helicek

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istanbul - turkey

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microdrones is another one to check. (once again)
Ahmet

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12-17-2008 05:37 PM  8 years agoPost 18
theslayer

rrApprentice

Munich-Germany

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Photoship One was planning on designing one, at least there was a big thread by DJ on HF...

Wanted to use t-rex 450 blades and of course collective pitch...

Daniel

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