Will post the usual opening shot of the parts and inbuilt kit at the beginning later. Bit excited as in finally made some progress in this project. I finally found the correct sized tubes! They're essential for this build! anyway here the first glimpse:
(https://farm8.staticflickr.com/7922/47370435832_644346ab29_c.jpg) (https://flic.kr/p/2faXSdh)IMG_20190319_231722651 (https://flic.kr/p/2faXSdh) by Buddy Holly (https://www.flickr.com/photos/jetsonsspecial/), on Flickr
Anyone recognizes an academy ov-10. The brown blob's are the PT6 engines borrowed from an Twin Otter. :unsure:
Really not sure if it will make the deadline in time but who dares, wins...
David aka 63cpe
Found the starting pictures back again on the phone. So, This is how it started...
(https://farm8.staticflickr.com/7925/46511740855_4d3854b87f_c.jpg) (https://flic.kr/p/2dS5Q7t)IMG_20190320_090658521 (https://flic.kr/p/2dS5Q7t) by Buddy Holly (https://www.flickr.com/photos/jetsonsspecial/), on Flickr
I started early this morning to make good progress. And progress was made!
The aluminum tube was cut in 4 pieces of 10 centimeters, ends were sanded smooth. Boring job was to cut 16 round plates from 0,75 mm styrene sheet. 8 of those are used as end plates of the tubes, the other 8 are cut again. This time a 20mm circle in the middle of the plates were made and presto! The first testfit for the rotors was successful (see left hand side of picture). Also cut out the main carriers for the for and aft set of rotors.
(https://farm8.staticflickr.com/7892/32485005467_7e4ecc0371_c.jpg) (https://flic.kr/p/RuA9na)IMG_20190320_101436195 (https://flic.kr/p/RuA9na) by Buddy Holly (https://www.flickr.com/photos/jetsonsspecial/), on Flickr
All rotors almost finished. Main carriers for the for and aft set of rotors in front:
(https://farm8.staticflickr.com/7823/46511740675_cdf116fa30_c.jpg) (https://flic.kr/p/2dS5Q4n)IMG_20190320_113019451 (https://flic.kr/p/2dS5Q4n) by Buddy Holly (https://www.flickr.com/photos/jetsonsspecial/), on Flickr
all rotors finished and rotors attached to main carriers. Rotors are able to rotate!:
(https://farm8.staticflickr.com/7921/32485005387_b701b8e16a_c.jpg) (https://flic.kr/p/RuA9kM)IMG_20190320_123818278 (https://flic.kr/p/RuA9kM) by Buddy Holly (https://www.flickr.com/photos/jetsonsspecial/), on Flickr
With the Flettner rotors in front of the fuselage it definitely look like a combine!
After some test fitting the pillars on the Bronco's fuselage proved to be to low. Now the front rotors touch the upper canopy. So remove the pillars and made me new ones. The aft set of rotors are going to be put higher than the set in front to make the best use of undisturbed airflow.
Next up are the engines. they are to be put just in front of the forward set of rotors.
For any further reading over Flettner rotors and its use on aircraft: https://en.wikipedia.org/wiki/Flettner_airplane
And a video proving the concept is able to fly! https://www.youtube.com/watch?v=hlmvHfIAszo
David aka 63cpe
WHAAAAATTTTTTTTTT? :o :o :o :o :o :o :o :o
Lovely concept! :thumbsup:
That is so not what I was imaging from your initial post. What a crazy and wonderful idea! :thumbsup:
I thought I had seen some strange flying machines but this takes the cake!!
Definitely a concept I had never seen before! I'll love to see this one come along.
I have heard of the Flettner wing system, but that video of the R/C model is magic. :wub:
This model certainly fits the title of this GB perfectly.
:thumbsup: :thumbsup: :thumbsup: :thumbsup: :thumbsup: :thumbsup: :thumbsup:
Fantastic idea. What a weird concept. :thumbsup:
Flettner wings are possibly a solution in search of a problem. I wonder what effect on the handling the gyro forces from the spinning cylinders would have? Maybe something unexpected a skilled pilot could use in combat?
I like it. Can't wait to see more.
Destroying a twin-boom layout is acute heresy, but here: the result is very nice, all right! :thumbsup:
The Magnus effect. :thumbsup:
Yep, lift is generated by the Magnus effect.
Now the fuselage is ready for the spray booth, let's test fit the contraption:
(https://farm8.staticflickr.com/7848/40477650993_deb1199722_c.jpg) (https://flic.kr/p/24ESxqn)IMG_20190322_195743443 (https://flic.kr/p/24ESxqn) by Buddy Holly (https://www.flickr.com/photos/jetsonsspecial/), on Flickr
(https://farm8.staticflickr.com/7816/46720480044_fb1e7460c6_c.jpg) (https://flic.kr/p/2ebwF11)IMG_20190322_195829641 (https://flic.kr/p/2ebwF11) by Buddy Holly (https://www.flickr.com/photos/jetsonsspecial/), on Flickr
(https://farm8.staticflickr.com/7904/40477651153_041fabb9e1_c.jpg) (https://flic.kr/p/24ESxt8)IMG_20190322_195900925 (https://flic.kr/p/24ESxt8) by Buddy Holly (https://www.flickr.com/photos/jetsonsspecial/), on Flickr
(https://farm8.staticflickr.com/7868/46720479894_f2ec296d5f_c.jpg) (https://flic.kr/p/2ebwEXq)IMG_20190322_195915541 (https://flic.kr/p/2ebwEXq) by Buddy Holly (https://www.flickr.com/photos/jetsonsspecial/), on Flickr
(https://farm8.staticflickr.com/7837/46720479814_4f3a036208_c.jpg) (https://flic.kr/p/2ebwEW3)IMG_20190322_195920234 (https://flic.kr/p/2ebwEW3) by Buddy Holly (https://www.flickr.com/photos/jetsonsspecial/), on Flickr
(https://farm8.staticflickr.com/7864/46720479694_3979c7cf72_c.jpg) (https://flic.kr/p/2ebwETY)IMG_20190322_195936238 (https://flic.kr/p/2ebwETY) by Buddy Holly (https://www.flickr.com/photos/jetsonsspecial/), on Flickr
The protruding beam upfront is the main engine carrier. It'll end in a beam across carrying two PT6 engines from a Twinotter on each side just in front of the frontal rotor.
Hope you like it!
David aka 63cpe
Wow! :wub:
That looks truly awesome. :thumbsup:
Do the multiple 'rotor discs' spread along the 'span' improve the lift?
The Flettner rotors used on ships only seem to have one disc, right at the top of the rotor.
Quote from: PR19_Kit on March 22, 2019, 04:09:50 PM
That looks truly awesome. :thumbsup:
Do the multiple 'rotor discs' spread along the 'span' improve the lift?
The Flettner rotors used on ships only seem to have one disc, right at the top of the rotor.
I'd assume that the disks prevent the air, traveling over the rotors from "spreading" and the direction of lift being lost. Not such a problem on a ship with a vertical rotor but more important on an aircraft.
That's exactly why the discs are there, to prevent air from spreading over the rotor and create lift.
As the engines are to be placed just in front of the inner sections of the front rotors, most lift will probably created there.
By the way the spinning of the rotors control the lift. If rpm is low, less lift is created ergo if rpm is up more lift is created. I figured with four independent rotors and a rudder, one can control the aircraft in all three axis.
David aka 63 cpe
How are you powering your rotors?
Ehm, no...maybe a future version? I'm worried about the weigh. Think the motors plus the rotors will get too heavy and the spindly undercarriage will collapse.
David aka 63 cpe
Quote from: 63cpe on March 23, 2019, 02:48:19 AM
and the spindly undercarriage will collapse.
In the what-if universe, a weak-looking undercarriage may be very strong (titanium matter or other, top secret...) ;D
Sorry Dave, I wasn't clear. I didn't mean are you motorising the model, I meant how would Rockwell power the rotors on the real FAR-X?
Ahw, right! understood....
I was thinking about putting electric engines in the rotors. Electric engines are able to spin really high rpm's, weigh is depending on the type of engine (was thinking about coreless engines for their ability to accelerate rapidly, lighter in weigh and low torque). Electric power will be supplied by an apu just below rotor assembly and control of it all by fly-by wire...
David aka 63cpe
:thumbsup:
That's what I was thinking.
Great minds think alike, isn't it?!
:mellow: :lol:
David aka 63cpe