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Jan 17, 2012, 02:38 PM
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VTOLicious's Avatar

gyroscopic effect


Quote:
Originally Posted by Dzl
More images, videos and info on this blog:
http://dzlsevilgeniuslair.blogspot.com/
Hey Dzl! Nice work, nice blog!

Quote:
As expected it has a tendency to wobble. This is caused by the gyroscopic force of the propeller. I have designed the firmware so that i can offset the angle between the IMU thrust vectoring vanes. This should allow me to compensate for these forces
In theory the offset between action an reaction is 90°... whatīs your conclusion?

Iīm playing around with a similar vehicle. I donīt use any offset by now, but considering testing it. Might make life of the flight controller easier
On a earlier, completely manual controlled tailsitter, Iīve used 45° offset - worked well, pic attached.

SDP-VTOL V1.2 - Testflight (0 min 53 sec)


Rgds Michael
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Jan 17, 2012, 05:04 PM
Registered User
Well, actually the 90 degrees thing is not a hard rule. There is a component of the tilting force that gets offset by 90 degrees, and the volume of this component is proportional to the speed and mass of the prop. A very light prop or one that turns slowly won't show as much offset
Feb 06, 2012, 05:59 PM
Dzl
Dzl
Registered User
Well i expected something like 45 degrees as well but ended up with 10. I have my device hovering stabilized by the auto pilot. By changing the angle i can get it to wobble both clockwice and counter clockwice. When the rotation is 10 degrees it's stable. I guess it completely depends on what ratio you have between the forces from the control surfaces and the gyro forces from the propeller.
Anyway really nice construction! And flying without IMU pretty ninja too (know how it is)
Feb 17, 2012, 11:06 AM
Registered User
hi Gary, for your flying ball project--your CC board was set at heli mode or airplane mode? thank you. eric
Feb 17, 2012, 11:12 AM
Emress
im not sure but here : http://dl.dropbox.com/u/2248531/www/...bot/index.html it says: "I am using helicopter style controls so a special mix of
throttle, aileron, rudder and elevator stick is needed for
each control surface.
My EVO-9 transmitter is able to do this mixing internally
so the servos can be directly connected to the receiver.
Later versions of the H-bot will use an onboard micro
controller to do the mixing. Gyros, accelerometers and
other sensory will then be incorperated into the mix as
well."
http://dl.dropbox.com/u/2248531/www/.../hbot/smix.gif
Feb 18, 2012, 07:55 AM
Registered User
Sirbow2,

Many thanks.
Mar 19, 2012, 10:33 AM
Registered User
hello everybody, i am so glad to found this topic because my senior project is doing flying sphere ball . i follow this thread, read and do my sphere.
this is my sphere


and i can figure out sam's wiring configuration to use 6 servos for pitch and roll


but my sphere is not stable when i hover.

i am not good at English, sry for my English skill

Nat
Mar 20, 2012, 06:52 PM
J. Titors gr8 grandson...
Sonofagun's Avatar
Your english is fine...however sometimes a video is worth a thousand words.
Mar 21, 2012, 09:10 AM
Expat
Quote:
Originally Posted by Sonofagun
Your english is fine...however sometimes a video is worth a thousand words.
And your pictures are too small. About 10 words.
Mar 23, 2012, 01:34 PM
Registered User
[I
thank you for your comment, i will post vdo later.
Last edited by natzjiem; Mar 23, 2012 at 01:42 PM.
Mar 28, 2012, 08:51 PM
DotCoDotUk
Innerbreed's Avatar
Hi guys, i will start a thread on this when i get more time but for now i have my sphere to show you. Yes some of you have already seen the Japanese flying Sphere 'well who wouldnt want one. i asked myself that and decided "well i do" so im building one.

Here are the CAD designs still in process, supplied by a good friend DialFonZo.
The Material will be cut from 3mm PVC Foam board, (light but strong), and will be powered using a Thunder Power 2100mAh 3-Cell 11.1V LiPo Battery with a Turnigy Park 300 Brushless Outrunner 1600kv motor.
It will pose x3 HK401 Heading Hold AVCS Gyros, and (at the moment) x6 Hs-65hb servos.

The Sphere will be 12" in diameter.

Jonny Poole
www.innerbreed.co.uk
Mar 28, 2012, 11:29 PM
Registered User
Hi Innerbreed.
This is the best first post ever!
I will follow your design and build. always thinking to build one, but plans were missing.
Takis
Apr 02, 2012, 08:00 AM
Expat
Great idea Jonny. If you get it working, you could sell kits. I think these would sell well. There is nothing this safe and versatile on the market right now. The closest thing is something like a quad with a epp prop guard, still dangerous, and expensive. Shipping would not be bad on a fully assembled model either.
Apr 25, 2012, 08:38 AM
DotCoDotUk
Innerbreed's Avatar
project thread.
https://www.rcgroups.com/forums/show...6#post21430963
Apr 26, 2012, 05:46 AM
Registered User
hi guys , can any1 tell me what is the role of those spoilers ? and also im trying to build this sphere .. can i use this stabilization system http://www.store.revolectrix.com/Pro...-Pilot-II-L-C2 .. or can u suggest something else ?
thank you


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