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Boca Bearings . Modefo's RC Helicopters . XHELI.COM

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Scale Model RC Helicopters > KA22 Vintokryl VTOL
 
 
heli_madken
Senior Heliman
Location: Liverpool, England

Hi All, thought now that I have it flying I would share with you my latest project, its a twin rotor / twin propellor semi scale model of an obscure russian VTOL aircraft circa 1959, the Kamov KA-22 Vintokryl. The aircraft was designed as a compromise giving the advantages of a helicopter in vertical take off and landing, plus fast forward flight given by the forward thrust of the propellors. It still holds certain records to date for load and speed categories. The project was abandoned after two crashes, they just didnt have the technology to see it through.



I cant make my mind up which forum this belongs as its definately not a tandem as such but neither is it true scale so apologies if it doesnt quite belong here.

I started out by getting a set of plans off the net, I then did the design work in AutoCAD drawing it up as a 3D model -



The wings and fuselage are made from 1.5mm birch ply formers with aluminum reinforcements using the same sort of techniques you would use to make an RC Aeroplane, covering is Solarfilm -



Next I worked out cyclic controls for the helicopter heads, tail surfaces, flaps and ailerons -



I used JGF 500TH for helicopter rotors and geared JGF 450TH motors for propellors all driven by seperate Pheonix 45 ESC's. Motors are mounted in outboard nacelles made from 1.5mm carbon fibre -



The rotor heads are 450 sized (720mm Rotor Disc) and are my own design 4 blade heads to match the original, shaft size is 6mm with ECO 8 swashplates and my own design swash drivers -



A GY240 gyro controls tail and a G190 controls aileron -



Mixing for the two heads is via a Techmodelproducts TH2-VTOL controller. This applies differentail collective pitch to the heads to control roll and yaw -



The TH2 has an extensive range of settings programmed via a USB link to a PC. I am using a 10 channel RX with all channels occupied!, the heli has 13 servos in total, the flight mode switch controls 3 modes via a range of TX mixes -

Helicopter mode (hovering), only the 6 cyclic servos are active (flaps and ailerons are set in fully down position), only the two 500TH motors are driven

Hybrid mode (transition to forward flight), all servos are active, power is split between the two sets of motors, gain is reduced to helicopter cyclic servos

Aeroplane mode (forward flight) as above but power is reduced further to 500TH helicopter motors, TRex autorotation hubs are fitted to allow autogyro effect

Some of the mixes -



Wiring all this together takes some thought! -



I still have the fuselage to cover which I wont do until all testing is complete -



I am at the stage of testing now, I intially had some problems (and still have) balancing both rotors which I intend to solve using the new eMultiGov governor by Aerospire. I have been able to sustain flight now although in the video I am attaching I had the gain set too high on elevator so it looks a little uncontrolled but thats easily fixed -

First showing rotor balance problem -

http://uk.youtube.com/watch?v=Cv-fou4rxfk

Second showing soem taxi testing -

http://uk.youtube.com/watch?v=MjFM_7l24C8

And sustained flight albeit sensitive on elevator but aileron and rudder are rock solid -

http://uk.youtube.com/watch?v=A6oRSwBZXlA

Next is to sort elevator sensitivity and fix governors then more testing

More pictures in my Gallery
10-01-2007 Over year old.
HOMEPAGE  
 
 
lrogers
Key Veteran
Location: Mobile, Al

VERY impressive! How much R&D time have you got in it?

Larry Rogers - R/C Helicopter Pilot
10-01-2007 Over year old.
HOMEPAGE  
 
 
heli_madken
Senior Heliman
Location: Liverpool, England

Thanks,

I started work on the design last March so relatively speaking it has gone together quite quickly.
10-01-2007 Over year old.
HOMEPAGE  
 
 
bwellmaker
Senior Heliman
Location: Long Island

Unbelievable!!!

I thought my project was complex but this is off the hook.

Keep up the good work, and please, keep us posted on your progress.

Butch
10-01-2007 Over year old.
 
 
rotormast
Heliman
Location: Carrollton, Texas

Looks good

Check out my gallery. Have my V-22 model flying well. Have been in full airplane mode a few times but still have issues to work thru. I also have some youtube shots under user Rotormast. I am using the 500th and the CC45 amp speed control. The mixer is my own design. Are you using a gyro on you for/aft control. I do. Its not a must but make the ship fly much better. If you have any questions or need help drop me a line. Tom
10-01-2007 Over year old.
 
 
heli_madken
Senior Heliman
Location: Liverpool, England

Tom I have seen your videos in the past which gave me some inspiration on this project, in many respects mine is easier as I dont have rotating nacelles to cope with, be interesting to see what happens when I throw the switch to hybrid mode though!

I am just about to put a gyro on elevator as it will be relatively easy to do, I will let you know how I get on
10-01-2007 Over year old.
HOMEPAGE  
 
 
heli_madken
Senior Heliman
Location: Liverpool, England

Link to the real thing for comparison - http://www.youtube.com/watch?v=eK7P6502MYM
10-01-2007 Over year old.
HOMEPAGE  
 
 
THX1138
Elite Veteran
Location: Plainfield, IN

Ok, Seriously...

Dude,

That is one of the single most intense things I have ever seen. Good job brother, good job. I mean seriously that is totally insane and I love every bit of it. I wish you the very best.

Lou

Bowstrings, Banjo's, and Birkenstocks.
10-01-2007 Over year old.
 
 
Super-Hornet
Veteran
Location: Singapore

Cool project!!!!!

It inspire me maybe to build one similar also but maybe V-22 Osprey.

Did u manufacture the 4 bladed head?

The 4th test video indicated that is suffers from the elevator (forward-backward) stability. Is your whole rotor system fixed? or is it adjustable like V-22 Osprey? Is your rotor head rigid or articulated type? I believe if you can make the whole head movable (like Osprey) or if u have some sort of flapping hinges on your rotor head, it might fix your rocking forward-backward problem.

SH
10-02-2007 Over year old.
 
 
seattle_helo
Key Veteran
Location: Washington State, USA

Holy smokes, that is incredible!
10-02-2007 Over year old.
HOMEPAGE  
 
 
heli_madken
Senior Heliman
Location: Liverpool, England

Hi, The elevator problem was mostly down to having too much gain (swash movement for elevator) in the TH2 mixer, I didnt have my laptop with me to trim it down. It was also down to my nerves as I was shaking like a leaf! Off camera I could control it better but it was a tiny movement of right stick that induced the pitching.

I am also going to fit a third gyro as it will help, there is a lot of weight in the fuselage forward and backward of the CoG which doesnt help stability.

The heads are my own design and are rigid, I am using 325mm wooden blades from a TRex, they are very flexible so I dont feel there is any need for the teetering head. The heads dont rotate in any way like the V22, forward propulsion is from the two propellor motors.

Thanks everyone
10-02-2007 Over year old.
HOMEPAGE  
 
 
James
Senior Heliman
Location: california

Ka22 vintokryl VTOL

your a real good craftsman you did a great job in building it vary nice.

cheers - Jim
. US Coast Guard
10-02-2007 Over year old.
HOMEPAGE  
 
 
heli_madken
Senior Heliman
Location: Liverpool, England

Thanks Jim, I dont think its up to the standard of the scale offerings on this page but I am counting this as my first version, I want to use this as a plug to build a G/F version in the future, its mostly just for testing at the moment
10-02-2007 Over year old.
HOMEPAGE  
 
 
Peter Wales
Key Veteran
Location: Orlando Fl

Quote 
I dont think its up to the standard of the scale offerings on this page

Most of the helis on this page are kits, modfied or stock, but someone else did the hard work.

Your model is great, I love it, particularly because you took a fresh idea and did it all yourself from parts available together with a lot of ingenuity. Dont sell youself short, you get lots of kudos in my book. Well done!

Peter Wales
10-02-2007 Over year old.
HOMEPAGE  
 
 
heli_madken
Senior Heliman
Location: Liverpool, England

Thank you Peter, dont know what else to say, your work has inspired me so much thats incredible
10-02-2007 Over year old.
HOMEPAGE  
 
 
heli_madken
Senior Heliman
Location: Liverpool, England

Hi During the winter I have built V2 of my KA22 project the ultimate goal being to cut down weight.

Weather has been awful here very windy but I have had some scary flights (definately a no wind model this one) you can see a video of the second flight here, bit unstable in the wind but getting there -

http://s215.photobucket.com/albums/...nt=SV_A0059.flv

I started with a carbon spar of 1.5mm thick sheet, made from horizontal and vertical components that interlock with each other and glued together with high strength rubberised CA -



I redesigned the side frames to make them smaller and lighter and reinforced with the spar running through them, the whole assembly was significantly lighter than the aluminium spars used previously.

The wing formers where made in 1.5mm birch ply and as light as I could get them, they feed onto the carbon spar and lock into place naturally then glued with CA (the whole thing was like a chinese puzzle to assemble) The top surface was then sheeted with 1.5mm birch play to add strength -



The fuselage was made as before using 1.5mm birch bulkheads but this time much lighter in section. The wing is joined permanently to the fuselage via alloy box section running through the carbon spar. Longerons are 2mm section again lighter than before -



Next came the wiring the big difference here is that I am not using a seperate RX battery this time (weight saving of over 350g) I have used all four CC45 BEC's wired together on a common rail. Works a treat and I have done extensive testing with no problems so far. This gives more than enough power for the 13 servo's 3 gyros, Tandem controller and RX!

The main part of the electronics are on a carbon tray and are easily accessible -



Once complete I could assemble the fuselage on a jig -



Next came sheeting in 1.5mm balsa which I have never done before and enjoyed imensely, once complete and rubbed down I covered in finishing resin and cloth as per model aeroplane construction, makes a very strong but lightweight structure -



The tail was built much simpler than before to save weight in this area with more direct control via servo's the mounts for the servos are incorporated in the birch ply spine of the fuselage -



Last job was to build the seperate cover for access to electronics and battery this is held in place by 6 magnets -



After much preparation and sanding I have now primed the entire fuselage and masked out the cockpit windows -



Next stage in construction is to build nacelle covers which I will model in clay initially then produce in GF. Then panel lines, rivets and final painting

Next stage in flying is more experimentation in tandem mixer settings, I am also going to try a HH gyro on elevator as this is the area that seems to give me most control problems. I will also wait for calmer weather, first flight almost ended in disaster when a gust of wind flipped it over and it landed perfectly upside down on the two rotors and tail thankfully without any damage. probably shot myself in the foot building it so light!
04-02-2008 08:18 AM
HOMEPAGE  
 
 
bwellmaker
Senior Heliman
Location: Long Island

WOW!!!

I do not know what else to say.


Butch
04-02-2008 11:59 AM
 
 
BigguyOz
Key Veteran
Location: Sydney, New South Wales, Australia

I am gobsmacked! That is one awesome piece of craftsmanship. Bravo!

Tony Stott
Scenefromabove.com.au
Trex 450,
8 & 13.3m mast
AP hot air balloon
AP kites
04-02-2008 01:52 PM
HOMEPAGE  
 
 
Pelos
Senior Heliman
Location: Bizkaia (Spain)

Quote 
probably shot myself in the foot building it so light!

It's never too late to add weight

Amazing project, design and implementation. Thanks for sharing it with us.

Is there a life outside the sim?
04-02-2008 03:09 PM
 
 
WIRLYBIRD
Senior Heliman
Location: CAPE TOWN / SOUTH AFRICA.

Heli_Madken , this is a very profesional build , I think very cleverly thought out , and no doubt will end in success.
Best of luck with your project,
Dave.

The fact you got PETER drooling , speeks volumes!!!!

WHAT GOES UP MUST SURELY COME DOWN.
04-02-2008 05:00 PM
 
 
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Scale Model RC Helicopters > KA22 Vintokryl VTOL
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