6th Sweepstakes - Rogallo wing Microlite plane

Started by ashok baijal, July 02, 2015, 01:29:23 PM

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ashok baijal

While the Airboat build is progressing albet slowly, I am now attempting to build a Rogallo wing based microlite plane. I have some ripstop nylon lying with me, so would be using that.
The carbon fire rods lying with me are 4mm dia and 75cm long. So the dimensions of the wing are dictated by the rod length.
The build begins with the wing.

ashok baijal

Started by creating the top brace. Cut out a piece of ply and stiched the three carbon fibre rods as shown below

ashok baijal

Next step was attaching the cross brace wich is another 4mm carbon fibre rod of 75cm length. Prepared two ply triangular supports and stiched one ply piece on each of the two outer rods. The cross piece was stiched to these two pieces. After ensuring that the two sides were symetrical, applied cyno to the joints. The wing frame stands completed.

ashok baijal

Cut out the covering, but decided to wait till later before fixing it to the frame. So next would be building the fuselage.

K K Iyer

Quote from: ashok baijal on July 02, 2015, 09:59:15 PM
So next would be building the fuselage.

Ie, the pilot. Because the pilot is the fuselage ;D

rastsaurabh


K K Iyer

@rastsaurabh,
Y ???. You mean Why?

Its not.
The covering will be pulled in towards the outer arms of the frame.
Allowing it to balloon between the centre and side arms.
See pic in my prev post..

sanjayrai55

This is very different, very interesting. I'm captivated  ;)

ashok baijal

Quite a challenge as I am building from my imagination. Started work on the trike, took a lot of thinking for desigining the two axis movement for the wing.

@Iyer - I am not going with the hang glider version as this would require building all the servos and electronics inside the doll pilot. So building a powered trike microlite.

Will update today's build by tonight or tomorrow night depending on the progress.

vishalrao


ashok baijal

Took some curtain railing and after drilling lightning holes, made a basic structure of the trike as shown below. Steering and elevator servo holes were cut off and two 9gm servos installed. Now it is time to design the control mechanism for elevator and aileron functions. Lets pray that I succeed in making one.

wingmanbunty

EAT ,SLEEP , FLY

ashok baijal

Update: The trike frame was joined using epoxy. However, the joints were not strong enough and opened under pressure. So rebuilt the trike but this time used rivets/screws at the joints.
Made a small plywood box for fixing the aileron servo. Attached two aileron cranks that I had which would serve as a bushing for attaching the servo box to the pillars. This servo box has to move in conjuction with the elevator servo attached to one of the pillars.

ashok baijal

More pictures of the aileron servo box

ashok baijal

Next step was to build the arm which would move in tandem with the aileron servo. Cut out a T shaped piece from lite ply and after drilling a hole inserted a small piece of brass tubing to serve as a bushing.

ashok baijal

Since the Rogallo wing will rest on this pivot attached support arms for the two axis. One arm was inclined at around 15degrees to give the initial incidence to the wing. I have attached this part using hot glue so that in case of need the incidence angle can be changed depending on the flight performance.

docnayeem

Great going sir , Are the frame joineries riveted ?
Can you please post a pic of the rivets used and the tool . would be a great help
Regards

ashok baijal

The wing support brace was attached to the top of the servo box using a thin bolt. The brass bushing already inserted into the T shaped support allows this piece to rotate around this bolt. The aileron servo was attached to this arm.

ashok baijal

#18
I then did a trial mount of the wing frame on the central pivot. Attached a receiver and tested out the concept. A youtube video is attached. I fell the servos need to be upgraded to more powerful servos. Maybe in the next version of the trike.


ashok baijal

@docnayeem. A photo of the rivets and tool attached.

topalle

Nice build sir... I have one question.Where did you source the nylon from?
Amateur photographer ... DIY enthusiast ... Scratch Builder... Student-Innovator

aniket210696

wow this is fascinating! :O
just a thought, what if you used 3 servos in a 120 deg configuration? like a helis swash? that should give you a little more strength too...
.

bmblb

#22
 Superb, Ashok Sir !

.....here's a pic of the rogallo kit I put together sometime back......fits together quite well.
the main joint is aluminium and two extreme ones are teflon, center nylon....and the mid-strut clamps are 1.5 Almn.....

....hope to finish after yours.

"The Flight Of The Bumblebee"

bmblb

#23
.....deleted :)
"The Flight Of The Bumblebee"

bmblb

Quote from: rastsaurabh on July 02, 2015, 11:05:11 PM
Y is covering  bit smaller than frame?

.......an umbrella when opened is taut vis-a-vis its frame.....in a rogallo wing, it needs to BALLOON....so, the fabric is a bit larger than the frame.....
"The Flight Of The Bumblebee"