Will this work for an octocopter frame design? - RC Groups
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May 08, 2011, 03:34 PM
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Will this work for an octocopter frame design?


Stupid question, but will a frame like this work for an octocopter? I ask because the arms don't go straight into the center of the frame as is typical. The lines in the picture represent the arms, the circles are the rotor blades movement. I'd be using the Hoverfly Pro board as controller. Thanks!

-Mike
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May 09, 2011, 01:43 AM
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yes it will work, and has been done before
May 09, 2011, 02:31 AM
MultiWiiHead
Centurian's Avatar
just remember that there will be some torque on the long arms... I wouldn't do them in wood, use alum or composite
May 13, 2011, 01:59 PM
Registered User
Yes, of course it will work - but beware of having the blades as close to each other as your diagram represents: the airflows off the tips of adjacent props will interfere with each other and cause potential problems.

A wiser, more experienced builder than me reckons the rule-of-thumb should be to have one propeller diameter of space between adjacent propellers.
May 13, 2011, 02:40 PM
Consistently Inconsistent
Quote:
Originally Posted by jes1111
Yes, of course it will work - but beware of having the blades as close to each other as your diagram represents: the airflows off the tips of adjacent props will interfere with each other and cause potential problems.

A wiser, more experienced builder than me reckons the rule-of-thumb should be to have one propeller diameter of space between adjacent propellers.
I don't think that part highlighted in red is correct.
My MK Okto has less than an inch between blade tips.
For the "diameter" of the blade pattern to a have prop's length between blades, the arms would have to be very long.
May 13, 2011, 03:16 PM
Registered User
Quote:
Originally Posted by kosins
I don't think that part highlighted in red is correct.
My MK Okto has less than an inch between blade tips.
For the "diameter" of the blade pattern to a have prop's length between blades, the arms would have to be very long.
That's why I attributed it to someone else - unfortunately cannot find the reference - he's on of the best acrobatic flyers I've seen . It makes sense to me, though - and just because many craft break the "rule" doesn't make it invalid.
May 13, 2011, 04:44 PM
$#|+
mkmkmk13's Avatar
if you're building an Octo with 12" props and place a foot of space between the 8 props you would have a gigantic Octo
about 5 feet across

from my experience bigger MRs are more stable, but if you go too big you'll lose yaw authority.
i don't have any experience with the Hoverfly board so i can't judge but some boards are just fine with just 1-3 inches between props

Moe


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