RC India

Hi everyone,
Many members seem to have caught the 5th Anniversary Sweepstakes fever.
Seniors as well as newcomers.
Occasionally when i post some videos of the Bipe, i get requests for details.

Starting this thread in the hope that it may be of some help to young members looking for an inexpensive, easy to build model that is safe and easy to fly.

You may have seen this 5sec clip.
www.youtube.com/watch?v=VUJHQWrxIlQ (http://)

Wing size and dihedral

Fuselage, stabilizer and fin/rudder size.

Wing location.
Using 1/8"x3/4" balsa.
Top wing staggered 1" ahead of bottom wing.
Angle of incidence - LE of wing is 1/4" or 6mm higher than TE (compared with zero/zero in tailplane and thrust line)

Fuselage bottom view

Motor mounting. Couldn't be simpler.

Model doesn't weigh much. But flown regularly in wind exceeding 10-15km. Indore is windy!

Other data:

Material - 6mm biofoam. One sheet more than enough!
Spars - 2mm od CF tube.
Dihedral braces. Two 3" pieces of cycle spoke, bent in the middle.
Spar location 2" from LE
CG on top wing spar.
Power - Donkey ST2204 1700kv and 10A ESC combo from HK
1300 mah 2s lipo
8x4 prop
1" lightweight wheels. Undercarriage legs thin spring steel wire. Let it flex, don't make strong/heavy.

Let me know if i've missed any detail.

Edit:
KITNA DETI HAI?
Flies on under 25watts, or 3amps. 10 minutes on half battery consumption.

You can even fly it in the rain!
www.youtube.com/watch?v=VJURc6hV_LQ&app=desktop (http://)
Even rcpilotacro enjoyed flying the INDORE BIPE outdoors in the wind!

Happy Landings.
www.youtube.com/watch?feature=youtube_gdata_player&v=_xRtOL_G6Gk&app=desktop (http://)
Goodbye. Thanks for watching.

very good design  {:)} {:)}
 

sir where you got the plans or you design it yourself   :headscratch:

very good job sir  :thumbsup: :thumbsup: :thumbsup: :thumbsup: :thumbsup: :thumbsup:
 :thumbsup: :thumbsup: :thumbsup: :thumbsup: :thumbsup: :thumbsup: :thumbsup:

Excellent!!

Great job sir  {:)}

it was one of the superb bipe i have flown, no aileron, only rudder and elevator, keep flying on and on

Great job there sir

Net connection is pathetic today - struggling to view the video. However, as opined by the experts, she must be a beauty. Congrats Sir!

Plans please?

Endorsements, endorsements, endorsements!
Many thanks for the kind words.
Who could ask for anything more
(Especially when i'm 64!)

@VC sir,
Pics have dimensions. No need for a drawing!

Rcpilotacro is a Magician,
Got a pm that he is sending me something i needed.
No clue how he came to know!

Good job Iyer.
Before going to Knp in November I had built a Hawker Hurricane though I never got time to fly it. Maybe one of these days I will try it out. Attaching a few photos.

More photos

One more

..and the last one

...and yes. All in weight of 264 gms except receiver which I have to locate in the stuff lying in the mini-workshop. Wingspan 31 inches. Control surface - ailerons and elevator. No rudder!!!!

@ashok baijal
Looks better than my much used Spitfire!

Edit: 2nd pic is rcpilotacro flying the spitfire inverted.

Hi everyone,
This Mr Ashok Baijal has come out of hiding.
He started aeromodelling in 1982, after seeing me, his neighbour.
(Before that he was an amateur radio HAM operator)
Now retired and has all the time in the world. So watch out for him.
Please welcome Mr Baijal to RC India.

Wonder if kudos kill off a thread.
No response from any of those who were asking for a simple model to start with.

Hi everyone,
728 views so far, but responses stopped.

Am now putting up INDORE BIPE for sale, rx ready.

Hence closing this thread and shifting to Sales board.

Goodbye.

Why this petulance? What do you expect or aspire for?

The thread started like this: "Starting this thread in the hope that it may be of some help to young members looking for an inexpensive, easy to build model that is safe and easy to fly."

And now you end it like this: "728 views so far, but responses stopped.

Am now putting up INDORE BIPE for sale, rx ready.

Hence closing this thread and shifting to Sales board.

Goodbye"

Today at the field got lot of kicks from fellow members.
Came back and saw your post.
Need to get my head examined.
Have two days left to do so in this financial year.
Will do innext two days.
Thanks for your concern.
Awaiting a few (well deserved) kicks from someother seniors too.

Bumping this thread in view of recent requests from members wanting to build their first RC model.
Enough dimensions/details on pics, so no need for a plan!
(BTW, the model has since been gifted to an old friend)

ha ha,first I didn't get it from your PM, thanks, Iyer sir.

Must have posted this clip of the first flight (1/10/13), but can't remember where.
So here it is again...

www.youtube.com/watch?v=I7TyW3_lHNg (http://)

Sure seems a friendly model

REFERENCE UR MODEL

IT IS GOOD

I WANT ABOUT MATERIAL THAT U HAVE USED

FURTHER ITS THICKNESS

SO I CAN MAKE MY

KP

@KAMALSAHAI,
PLEASE SEE REPLY NUMBER 6 FOR THE DATA.
REGARDS.
(Typing in capitals on the net is considered as SHOUTING. Has this not been mentioned before?)

Built this as first flyable coro trainer( built 5 more crashed within 15 sec)

 :headscratch:  A model for newcomers :headscratch: :headscratch:...?.............bipeplane.... :-\ i wouldnt mange it.........

@romanxdsouza,
Many opinions on trainers for newbies, all correct in different perspectives.
One view, esp in the US, is that a 40 size glow trainer is best.
RC Aunt says my 40 powered SoloStar is smoother than all my electrics.

But there is the issue of affordability too.
This bipe can be made with a single sheet of depron.
Say 100 bucks.
Add 1200 for Donkey combo (motor+esc) from Hobbysea.
Add 500 for two servos.
Add 100 for CF tube.
Add 50 for props.
All told under 2000.

From design point of view, the objective was low wing loading without increasing size.
If you see the video in the first post and I think the 29 th, you'll see how easy it is to fly.

sir any addresses where 6mm styrofoam svailable

Not styrofoam (thermocol). Its depron (biofoam). Even 5mm will do.
Sources
Vortex-rc in Allahabad
Bandi Traders, Rajwada in Indore
Stationery shop (forgot name), A.B.Chowk in Pune
No idea about Ahmedabad, sorry.

I think the cheapest is a dealer in Crawford Market in Mumbai. A year or two ago someone had posted the name, address and phone number in this forum, but i forget who and which thread...
Happy hunting!

thanks iyer sir

Single sheet of depron 100 bucks?? No way.
Also beginner may mean different things to different people...but that biplane I think I little too fast...beginners won't get time to think and respond...
Flies nice tho...

Time for me to build one. Thanks Iyer sir for the specs.

@SI74
Good to hear that you plan to build the Indore Bipe.
Pics on page 1 of this thread show a scale/ruler alongside each part.
You have flown a lot of models in your front yard landing on badminton court.
So you'll be able to respond to Imperial Fire's fear that it will be 'too fast'

Btw, since it needs only some 25watts for its sub 300gm weight, a small motor, a 6 or 10 amp Esc, and a 500mah 2s lipo are enough. The power train I used is an overkill - enough for continuous consecutive loops  ;D

I look forward to a video of a flight in your front yard, landing on the badminton court!
Best wishes.

Okay . Sure sir.Work started :)

Maybe she's fast, maybe she's slow.
Maybe I never posted this before.
My friend Ahmed flying, me catching!

https://m.youtube.com/watch?v=LW8flAh5WpI

And mine is ready...Yes!, superb test flights! . It is my first ever biplane.Happy with the results. Was little apprehensive when I first saw this model , but yes ,it's a simple build and great results! . Took time (1-2 hrs ;D) for drawing a plan. Build is easy.

Wow! Looks better than mine!

Only two days to complete from scratch and test fly!

Pl post details of power train, all up weight etc

And badminton court landing  ;D

 ;D Yes sir, here it is! Landing safely on my badminton court  ;)
Used 3mm depron,1600 KV Avionics motor, Wolfpack 300 Mah 2S lipo, 12 amp ZTW Esc, 8*6 SF prop ( will try 8*4 next time) AUW-225 gms

http://youtu.be/dS8ozIlI-Lo

http://youtu.be/FPih5eMFiPY

Update: flies well and slow with 8*4 EP prop.

 {:)} {:)} {:)}

Very nice  :thumbsup:

Thanks Sanjay sir, modified a little bit , added a canopy ( made with styrofoam ) , reduced height of balsa, used 8*4 EP prop, 500 Mah Haiyin Lipo.

https://youtu.be/K_7HR-aMk8I

@SI74
 {:)}
Excellent demo of the type of flying the Bipe was intended for!

Thank you sir for the encouraging words. Feels proud that I made you happy .

such an amazing build, an great flying , just lucky to see this thread today

Thanks for bumping this thread.
With the proposed regulations, this may be the only type of RC airplane that we can fly in cricket fields!

I am interested in making this plane as my 2nd plane.
So, this provide plans. K K Iyer sir said "there is no need of plans" but i am new & build only one plane which never fly. So, please provide plans.
@SI74  you said 1600kv motor but not more size. Tell me motor size.

@taksh
If you look at all the pics, you will find that a ruler was placed alongside.
So the measurements of the wingspan, wing chord, dihedral, tail span &chord, fuselage length/width, angle of incidence of the wings are easily visible.
To say that it can’t be built as there are no plans, is a lame excuse.
There is enough data in the thread to build this model.
But only if you have obtained one sheet of depron. Don’t build it with thermocol!
Just look at the pics carefully. You’ll find everything you need.

@ KK Iyer sir, your in box is  full. Not able to message/ communicate to you.

I apologise for that. It is because of me :)

Not at all.
Just exchanged half a dozen msgs with docsree, anew contact.

My inbox is sometimes full because I delete only 1-2 msgs out of 1000!
BTW, did you see the Indore Bipe thread, revived after nearly a year?
You may find it of interest...

Edit
Oops. It is this very thread!

Oh yes.
I have half a board of depron too. My Hand itches to start building one but I am controlling.
I Need to master chucks before RC.

If your depron is 3mm or more, please build this bipe at once.
Don’t worry if you don’t have the carbon tube spars.
I’ll tell you arecanut alternatives  ;D

then plz tell me Alternatives for balsa? i think icecream sticks will work.

@taksh,
Yes, good idea.

@taksh,
@ajay sarwan,
Please take a look at M2024 1600kv from RC Bazaar.
This is the cheapest suitable one I can find ~Rs600, in stock.
As per the data table, with a 7x3.5 prop, a 2s 500mah lipo should easily give you 6+ minutes.

http://rcbazaar.com/product.aspx?productid=4091

@K K Iyer
I have 500mah 3s lipo. I need motor for 3s.
Please suggest motor for 3s.

@taksh
Go the link and read the load test report on the page.
3s is 11.1 voltage.

I built the Indore bipe with recycled coroplast.
It's AUW is 360 grams, 80 grams heavier than depron bipe built by KK Iyer.
I tried drilling holes in fuselage to reduce some weight. But it did not help much.
(https://i.imgur.com/XQpmnwa.jpg)
(https://i.imgur.com/6FQs5Qd.jpg)
(https://i.imgur.com/LHVV0CJ.jpg)

Now I have some issues with motor.

Motor specification:
Motor: Avionic M2226/25 KV1800 MICRO brushless motor
KV (rpm/v): 1800
Power: 69W
Winds: 25
Resistance: 657 mOhm
Idle current: 0.5 A
Weight: 21gms

Combination of usage:
PROP - 6x4 E
● Get  200  gms Thrust
Lipo - 2 cell 7.4V
ESC - 20 amp

PROP - 7x3.5 SF
● Get  300 gms Thrust
Lipo - 2 cell 7.4V
ESC - 20 amp

PROP -  8x3.8 SF
● Get  500 gms Thrust
Lipo - 2 cell 7.4V
ESC - 20 amp

I have both 6x4 and 8x3.8 props.
And I use 30 Amp ESC, and 2 cell lipo 1500mah 25C.

I feel 6x4 does not produce enough thrust,
and when I put 8x3.8 prop, the motor jitters and does not spin.
At full throttle, the servos also jitters.
Is it because of faulty receiver or loose connections?

Colourful interpretation of the original!
See post 46&48 for equipment used by SI74 (an expert in flying in a really small area!)

This bipe is not designed to glide, as you found in your test glides!

Now an 1800kv motor (or 30rps per volt) is 240 rps on 8v.
Or 80fps on a 4” pitch prop.
Or about twice twice as fast as required, hence inefficient.

Your query was whether to try to fly it with the 6x4, despite apparently inadequate thrust.

My recommendation:
Go ahead with your 69w motor, 6x4 prop, 2s lipo
1500mah lipo and 30a ESC are far too much, but doesn’t matter.

The trick is to hand launch (level) as if you were test gliding, with the throttle about 50%.
This allows you to cut power if you see any problem.
And allows you to increase power and climb if all seems well...

thank you sir.
I checked the electronics now, and the servos go crazy at the top of throttle.
I will make a video and upload it tomorrow.
It will be easy to diagnose the problem.

sir have you designed anything similar in the recent years?

Yes. But that’s another story.

Saw from your post in the Sales thread that this Indore Bipe may interest you.
The original was taken away by an old friend, but I can easily make a copy.

If necessary, I can send everything needed to fly except for 30 minutes charging (though sending Lipos is not possible via Post Office)

But you may not need everything ready to fly, as you may already have some stuff (or most of it)

If you wish, you can say what you have (pl include specs) and what you need.

Regards

i really like your design sir and cannot express how happy i am to see this reply
and yes sir i do have some of the things

I have pm'ed you sir
please reply whenever possible
 
Regards
Nitya

Hi everyone,

Hard to believe it’s almost 10 years since I built this bipe, flew it, and gave it away.

Last fortnight I got a call from a member who had met me years ago, asking about depron for a trainer. I referred him to this thread, and offered to send him a kit, using the last of my 6mm sheet.

It took me a few days, as nowadays I work really slowly, and only as and when the mood strikes me.
Since the sheet was 26” wide, I made the top wing 26” span and the bottom one 22” (instead of 24” each).
Then made semi span spars out of coffee stirrers instead of CF tube.
And dihedral braces out of 1mm fibreglass sheet instead of cycle spokes.
Checked out a small motor lying unused for 17 years (!). Gave over 150 gms thrust with a 6x4 prop at 4amps/45watts. Enough for a sub 300 gm trainer. Though an 8x4 on 2s would have been more efficient.

Put it all in a box (that took me a long time to make!) and sent it away.

The next night I received a nice pic of the completed model.

Wonderful  :thumbsup: {:)}

so wonderful, there is so much hope

Great job sir  Clap

No response from any of those who were asking for a simple model to start with.

SPAMMER!
Sentence lifted from my own post #22 in this thread.