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Aug 30, 2020, 11:48 AM
Registered User
cbalgra's Avatar
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Discussion

Magnus Effect Twin Rotorcraft


Here's my Twin Rotor, Magnus effect craft that I finished a while back, but was a bit nervous giving it a heave. It is based on the twin rotor that I saw on YouTube, and used still shots to scale it to its' current state. I gotta say, this thing is strange, but so easy to fly. Throttle and rudder. That's it! Needs a bit of left thrust to get it flying straight, without holding rudder input, but overall a hoot to see orbiting around. Got a few strange looks at the park this morning too.

24" rotor span, 5" diameter
24'" tall (center to center of rotors)
weight- ?
2208-17 1000kv
8 X 3.8 prop
20amp esc
3s, 1000 mah lipo

RC Magnus Effect Twin Rotorcraft (5 min 25 sec)
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Aug 30, 2020, 06:06 PM
Retired CAD guy
birdofplay's Avatar
Gavin has had you cooped up WAY TOO LONG ! ! !

You have gone from traditional and Cute planes to
Calirad left turn only planes ! :>}

Nice effort though !
I'll bet it kept you out of the bars !

There have been others did you search for magnus in this forum...

This one really interests me ...
FanWing OHS Twin-Tail, June 2011 (5 min 32 sec)


And another
https://www.rcgroups.com/forums/show...10&postcount=7



Magnus efeect plane ? マグナス効果のようなもの?RC ROTORWING (2 min 10 sec)
Last edited by birdofplay; Aug 30, 2020 at 06:19 PM.
Aug 30, 2020, 06:30 PM
Retired CAD guy
birdofplay's Avatar
This page show more versions
http://www.fanwing.com/uav.htm

Have they thought about using two motors so the two side could be
used differentially for roll control ?

Something without those huge floppy and easily compromised surfaces.

Or maybe put a slight screw effect into each side to slightly blow air out to the tips
and direct that for yaw control.

OR BOTH !

Hey I'm just Spit Ballin here ;.}
Aug 30, 2020, 08:43 PM
Indoor FF is pretty neat
funwithplanes's Avatar
Okay thats pretty rad. I've been playing with some more conventional magnus effect airplanes, but I guess I better try something like this out sometime. Its much more visually interesting than a conventional layout. Like magic.
Here are my two. The champ was the prototype, and the big one was the next logical step.
Tumblewing Aerobatics and Autorotation with Ross Clements (5 min 29 sec)

Very large Magnus Effect R/C Plane (1 min 31 sec)
Aug 30, 2020, 09:03 PM
Registered User
cbalgra's Avatar
Thread OP
Fortunately Bob, I have been working the whole time during Covid and I have also been working on a few new "toonish" planes as well.

I have seen most of the Magnus machines here on RCG and on YouTube, and I thought this one was the most intriguing to me. I liked the way it "stood up" as it moved through the air. And didn't have anything that looked like airplane parts hanging from it, like many of the others do.
And for just using a few screen shots, from the vid below, and approximating size , based on the size of the persons' hand, I thought it came out pretty decent!

The rotor shafts are 3mm carbon rods, running through 7mm sealed bearings, to allow the rotors to spin very freely.

Here's the vid that got me motivated:
RC TWIN ROTOR WING Magnus Effect Plane? (4 min 7 sec)
Aug 30, 2020, 09:05 PM
Registered User
cbalgra's Avatar
Thread OP
fwp, That large one flies real nice!
Aug 31, 2020, 12:08 PM
Retired CAD guy
birdofplay's Avatar
YOU WIN , Brad !

That is the strangest of the bunch that I have seen as well.

I may , some day, do one of the more airplane like versions
out of Foam .

It appears that several other guys had overbuilt theirs and could not
muster enough power to get airborne. some even destroyed themselves.

Wouldn't you know that as soon as something interesting comes along
I get a couple of orders for existing designs.

Looks like low weight & good bearings are going to be key to this design.
Must decide on which method to embrace.
Motor driven rotors or free wheeling rotors.

The motor driven rotors look like they would be heavier

This might interest you as well ...
Last edited by birdofplay; Aug 31, 2020 at 12:17 PM.
Aug 31, 2020, 04:23 PM
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cbalgra's Avatar
Thread OP
Thanks Bob! You are too generous.

I held off doing the maiden on this thing for over a month, because I had this feeling it was going to be completely uncontrollable. But wow, was I excited when it basically flew itself, with just minor directional and power corrections. I was planning on catching it by hand in the video, but it was too far away when the battery gave up the ghost. I think it was at storage level when the flight began, and still got over 5 minutes cruising around at about 2/3 throttle.

I think your right about weight. I've been thinking all day, (at work, shhh) on how I could build a lighter, more rigid version. Have a few ideas I would like try sometime. And yes, good bearing are a must! Have also been thinking about that specific detail on the rotorcraft(?) A nice 3D printed piece would be ideal to house the bearings and be a mount for the vertical sheet of foam. Several images are in my head at the moment. And then what about a carbon fiber tube for the vertical section. Super strong, rigid and light. I may have to send you some sketches of what I'm thinking, in regards to the 3d printed parts.

I do have a smalll drawing of the "thing" I used to help me build it. I try to post it. ( I think i can find it ?) I can't wait to fly this thing again!
Aug 31, 2020, 04:32 PM
Registered User
cbalgra's Avatar
Thread OP
Bob, That Slat Wing aircraft brings to mind the Lanier Vacuplane XL-4. (Which happened to be designed at my wife's, college, alma mater.)

https://www.homemadetools.net/forum/...e-photos-78935


http://fajnysprzetbiodra.pl/lanier-vacuplane/ (right click to translate into English)
Aug 31, 2020, 07:31 PM
Retired CAD guy
birdofplay's Avatar
I have looked for Odd planes b4 but I never found that one.

Just curious ... ( right click did not work for me )
What was the purpose for that grill work on the top of the wing ?

For other pix is looks like the opposite of a UC wing section. Under Cambered

This is waaay too much to read or even process ... check it out ;>}
http://www.rexresearch.com/lanier/lanier.htm

AND I Still don't "Get it" !
Last edited by birdofplay; Aug 31, 2020 at 07:42 PM.
Aug 31, 2020, 07:37 PM
Registered User
cbalgra's Avatar
Thread OP
I would imagine so.

Here is the crude drawing I made to build the craft. ( i don't know what to actually call this thing)
Aug 31, 2020, 09:04 PM
Retired CAD guy
birdofplay's Avatar
Nice work.

Still need a front view tho.

But the pic's work for imagining whatever else is necessary.

Thanx

Bob
Aug 31, 2020, 10:21 PM
Sokol
JureZ's Avatar
nice job !


no problem to define the CG here ( grin)
Latest blog entry: Ahi, by Dream-Flight
Sep 01, 2020, 07:51 AM
Retired CAD guy
birdofplay's Avatar
OK here is a preliminary CAD drawing.

Feel free to make corrections or additions notes whatever.

A thought occurred to me about some other details, like ...

Are the Vanes offset on either side of the spar/axis/CF tube ?

What direction are these supposed to rotate ?

Are your bearings supported by some pocketed Ply or plastic part ?

You mention $tree board, so ... Paper ON/OFF ?
Last edited by birdofplay; Sep 02, 2020 at 07:42 PM.
Sep 01, 2020, 07:57 AM
Retired CAD guy
birdofplay's Avatar
I know it's not part of THIS design, but ...

Do you know which way the rotors turn on the Winged demo birds
in the EU pages and videos ?


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