before i begin this aircraft was first designed by Mr. Patrick Peebles and all the info about fanwing experimental aircraft can be found at


i had been researching this topic for the past few weeks and thought that the time to start the build had come. so today morning i finished up my calculations for the dimensions of the wing - blades , outer edges and the rotating mechanism.  here are some of the calculations

Cross flow Fan outer Diameter = 10cm

outer edge circular blade holders thickness - 4mm balsa

Wingspan = 100cm --> Built of two sections of crossflow fans with opposite blade declinations as shown here (each section futher sub divided into 2 more sections)


blade thickness - 2mm balsa

no of blades - 24 at every 15degrees on the blade holder

distance between blades -          angular  - 15 degrees
                                     circumferential - 1.308cm

Blade width  - 1.5cm

carbon fibre central fan spar diameter and length - 2 spars of outer diameter 1cm and length 50cm

motor - turborix 2836 222w 1000kv

gearing and belt system  - hobbyking gokart belt system

esc - 30A

Battery  - 11.1V 2200mah 20c

Radio - RDS8000

Contruction - wing - balsa
                   fuselage - balsa and depron
                   tail feathers - depron and cf rods

I began today by cutting balsa for the first half of the crossflow fan, i finished outer and inner blade holders and sanded them and one blade 23 more to go

Subbu

some more pictures

Subbu

Subbu, a thousand years ago, when I was a child, my Dad had bought me a toy from Germany,  that had rotating wings. It looked like a plane (fuselage) but the wings were designed to rotate horizontally about an axis. It was essentially a kite for gusting winds and designed for the sea beach.

I held on to one end of a string roll and the other end was attached to the model / kite. As the wind picked up, the wings started to spin about their axis, causing it to lift. I remember that it was great fun.

This seems to be the same principle. Must try and build that toy again............ Coroplast should make my  job easy! Thanks for taking me back to my childhood.

Same found in juhu beach and one is with me.
But it needs Airflow velocity > 20KMPH (Appx) which can found only in sea beach.

It's 17" wingspan with two rotor wing of 8" x 2".



Related Links :
http://www.ict.griffith.edu.au/anthony/kites/rotor/

great...even i bought it for Rs.20 from juhu beach long back......
Sandeep

Oh my God! That's the one! I would love to have one again. Requesting people who have access to it to please send me 5 pcs.I will pay for all expenses.

waiting

Quote from: VC on June 04, 2012, 12:54:32 AM
Thanks for taking me back to my childhood.

you are welcome vc bhaiya

as for progress i have finished making slots in 2 of the three outer blade holders and cut out a few more blades total blades  - 4 will post some pictures in the evening

Subbu

here is the gearing and power system i shall use for the crossflow fan

Subbu

where did u get these from...?? any links  please...!

sure why not i got them from hobbyking here are the links if you wish to buy them i have them posted on the hobbyking buddycodes page too
buddy codes are valid till 7th june

Belt - Go-Kart - http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=15342
Buddy Code - http://www.hobbyking.com/buddy.asp?code=5DFC140F-1883-429F-8475-ECD5725D96D8

Pinion - Go-Kart - http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=15363
Buddy Code - http://www.hobbyking.com/buddy.asp?code=EDC15E95-07FC-4673-838B-BF9234CC8537

Spur Gear Assembly Set - Go-Kart  - http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=15343
Buddy Code - http://www.hobbyking.com/buddy.asp?code=BB8A2655-3573-49FC-91ED-28352B9A99D7

Drive Gear - Go-Kart - http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=15341
Buddy Code - http://www.hobbyking.com/buddy.asp?code=1EE2E3E6-C267-4FAB-B7C5-D28F85640F69

i got the motor from sai uncle but i dont think you were looking for the link to the motor anyway sai uncle does not seem to have this motor in his catalogue on the website anymore but you might still try calling him

Subbu

  now this is jara hatke...  

good purchase...!

  waiting to see this in action

btw what is advantage of this over normal prop.?

hi karan
conventional propellers propel the aircraft henceforth creating airflow over the wing thus generating lift whereas the cross flow fan on the fanwing itself establishes airflow over the wing of the aircraft essentially making the wing generate lift. a few other advantages are that it has very little to none stall tendencies, higher lift compared to normal propeller and STOL (Short Take Off and Landing) ability.

so after an all nighter tonight i finished with the blade holders. i still have to sand them.
i still have a lot of blades to cut and install the carbon fibre central spar. anyway i have attached the pictures of progress below


Subbu

and another picture

Subbu

what are the gear ratios (ie. input : output) also pinion and gear dia and shaft sizes....

Wow............
Really Innovative...
Subscribed!!!

Quote from: AEROVISHWA on June 08, 2012, 01:53:45 AM
what are the gear ratios (ie. input : output) also pinion and gear dia and shaft sizes....

hi aerovishwa here are the details that you requested with reference to the pictures

pinion diameter             - 15 mm
input gear diameter       - 50 mm
output gear diameter     - 30 mm
pinion shaft diameter     - 3mm

I --- if i use the given setup the gear ratio comes out to be  --->  2:1   (input : output)
(which should step up my wing rpm from the motor rpm of 10000 to 5000 for the wing)

II --- if i mount the motor on the input gear (somehow) and make it one huge pinion i get the ratio --->  3:5 (input : output)
(which should step up my wing rpm from the motor rpm of 10000 to 16666.6 for the wing)

i plan to use the first (I) setup which is also depicted in the photo below but if the lift is too less i shall go to setup II

were you looking for any other dimensions when you mentioned shaft sizes other than pinion motor shaft diameter if any please mention.

thank you sumeet

Subbu

thanks a lot that helped...!!

how do u plan to check the vibrations in the fan wing...? it  will play an important factor  in  such a huge fan...!

also dont u have to  channelize  the thrust in  one direction... or does it work  on some other  principle I am  unaware of...! JUST EGER TO LEARN... 

Subbu, this is getting complex and interesting. Keep it up. Unless I missed it, what is your plan for the fuselage?

Btw, can NO One get me a Juhu Beach flyer @ Rs.20/- + inflation? I've had no offers so far............

thanks for having brought that up because the biggest challenge in this aircraft is to reduce VIBRATIONS whenever and wherever possible. a few of the methods observations and plans i shall use
1 - using ballbearings on the CF spars where they attach to the frame and assemble the gearing system on the CF spar end. this shall very nearly kill the main source of vibration that is mis-allignment.
(will get some 3d renderings up soon)

2 - to get each blade precisely cut is not a feat i shall be able to manage since i don't have access to a cnc facility (but a lot of members here do so if my handywork does not work then i shall have to give them to be cnc cut (IT WILL SAVE YOU A LOT OF TIME))

3 - due to me using 2mm blades there is a huge chance for the blade to flutter adding to more vibration henceforth i am attaching a third blade retainer in the center of the wing (refer the photograph), after the initial proof of thrust generating capability of the fan i am thinking of covering the blades with fibre tape to increase rigidity.

4 - finally i will try my best to level out the wing on both sides before first spin to reduce any contributing vibrations there.

these were the ones i could come up with yet if you have any specific issue in mind kindly mention it, it might  help me spot the flaw

regarding channelizing the thrust the crossflow fan takes care of it the angled blades in each half help accelerate the air over the airfoil to generate lift. in this process a lot of air is pushed back and down and this give the aircraft the minimal thrust it needs to move ahead (much like that of an EDF fan). please also refer to the attached picture 1.

this down draft of air prohibits the placement of tail feathers behind the wing and therefore that has to be elevated as shown in picture 2.

hope these answers help you

Subbu

u said u would need a 15degree  blade  angle... but looking from  the pic i suppose that every   bladeis in straight line  with the center....!!(pic)

also since the angle with the center is zero it will possibly blowout air from all  sides...!
OR AM I MISSING SOME THING

please post  from where are u are referring the  design or is it ur own..!

here on the right side there is a GIF u can see there that u  need 15 degree with the dia line...!

http://www.fanwing.com/desc.htm

a closer look here will also reveal the same....

http://www.fanwing.com/news.htm

Quote from: VC on June 09, 2012, 12:00:24 AM
Subbu, this is getting complex and interesting. Keep it up. Unless I missed it, what is your plan for the fuselage?

Btw, can NO One get me a Juhu Beach flyer @ Rs.20/- + inflation? I've had no offers so far............

hi VC bhaiya i have planned to use 6mm balsa bulkheads with balsa strips to create the skeleton of the fuselage and then use depron for the outer covering. the crucial part is where the wing joins the fuselage i plan to make that completely out of balsa. the plane needs to be light too so i am thinking of swaying from the fuselage mentioned in the original fanwing build but instead go with simpler stick like or a flate plate like fuselage as i have no previous experience in building complete fuselage out of balsa bulkheads and strips but i have made the fuse out of depron for my 747 build http://www.rcindia.org/electric-planes/61-inch-boeing-747-300-electric-ducted-edition-build-log/ and i can replicate that technique here.

would you have any suggestion in this matter. the mention of my 747 makes me want to have another go at it as i have another complete month free to build it but testing it would be difficult as rain gods have started showering their blessings here in mumbai

as for the Juhu Beach Flyer i am going to sushil uncle's shop in the next week for a soldering tutorial he has agreed to conduct for me so i should be able to visit the beach and scounder for the aircraft at least worth a shot.

Subbu