RC India

Matsumoto, my favourite designer, again :D

Span: 1330 mm
Length: 995 mm
Weight: 1600-1750 g (I've modified, and targeting 1400 g)
Wing Area: 27 dm2
Power: To be decided. Originally was a 25 Nitro. Will go with a 3536-1250 probably with a 10*7 eProp

(http://s25.postimg.org/jw9lyi7r3/20141128_183858.jpg)

(http://[url=http://postimg.org/image/aohdht0or/%5D%5Bimg%5Dhttp://s25.postimg.org/aohdht0or/20141128_183858.jpg)[/url]

(http://s25.postimg.org/9xonc0ybf/20141129_114903.jpg) (http://postimg.org/image/9xonc0ybf/)

(http://s25.postimg.org/axactzo3f/20141129_114925.jpg) (http://postimg.org/image/axactzo3f/)

(http://s25.postimg.org/p8ygcmvnf/20141129_115650.jpg) (http://postimg.org/image/p8ygcmvnf/)

(http://s25.postimg.org/8tzxmboaj/20141129_115702.jpg) (http://postimg.org/image/8tzxmboaj/)

(http://s25.postimg.org/n5o14yvuj/20141129_120001.jpg) (http://postimg.org/image/n5o14yvuj/)

(http://s25.postimg.org/5uxmcy46z/20141129_134133.jpg) (http://postimg.org/image/5uxmcy46z/)

(http://s25.postimg.org/tzybunohn/20141129_134144.jpg) (http://postimg.org/image/tzybunohn/)

(http://s25.postimg.org/fw2gm9ha3/20141129_193713.jpg) (http://postimg.org/image/fw2gm9ha3/)

(http://s25.postimg.org/s9fat66yj/20141129_193725.jpg) (http://postimg.org/image/s9fat66yj/)

(http://s25.postimg.org/41upomj0b/20141129_201132.jpg) (http://postimg.org/image/41upomj0b/)

(http://s25.postimg.org/dss1elhh7/20141129_201429.jpg) (http://postimg.org/image/dss1elhh7/)

(http://s25.postimg.org/vwzncz4jf/20141129_204916.jpg) (http://postimg.org/image/vwzncz4jf/)

(http://s25.postimg.org/kzybo7hrv/20141130_140710.jpg) (http://postimg.org/image/kzybo7hrv/)

(http://s25.postimg.org/hvnnrf0zf/20141130_140719.jpg) (http://postimg.org/image/hvnnrf0zf/)

(http://s25.postimg.org/kyodusfy3/20141130_191505.jpg) (http://postimg.org/image/kyodusfy3/)

(http://s25.postimg.org/l189hmjln/20141130_200729.jpg) (http://postimg.org/image/l189hmjln/)

(http://s25.postimg.org/one2u9pyz/20141130_200737.jpg) (http://postimg.org/image/one2u9pyz/)

(http://s25.postimg.org/obwmhi9iz/20141130_203252.jpg) (http://postimg.org/image/obwmhi9iz/)[/img]

I used 2 mm lite-ply for doublers.

The main landing gear bock- I have tried to design this so the impact of landing is transmitted over the largest possible area on the fuse

The ply doublers are glued with SR 998

The butt and fillet joints are glued with hot glue

Fuse & tail feathers 4 mm

Did not have yellow 4 mm corro for tail feathers so covered with thin vinyl (it comes in different varieties)

I'm waiting on wood for spars, and some other hardware. Hopefully it will come sometime this week

We are also waiting to see it on air. {:)} :bow: Go ahead master builder.

Well Sir I am Waiting for the complete love your speed I very much get inspired from you we really wanna thank you for making these models its an education towards R/C and help for Beginners.
Thank you So much Once Again :hatsoff: To YOU !!! :):)

Shijin and Aman   :thanks: :thanks:

Oh and if you want to see a larger hi-res pic, click on the pic and it should pop up, or right click on the pic and select open in new tab

Sure Sir I will Surely Love To See THE HD pics :D LOVE YOU !!!!!!!!!!!!!!!!!

Checking the weight at this stage

(http://s25.postimg.org/s93v0crzz/20141202_092517.jpg)

Put the stripes on the rudder using vinyl

(http://s25.postimg.org/bmmar9z27/20141202_092532.jpg)

Making the battery hatch cover

(http://s25.postimg.org/t8u5w275r/20141202_125509.jpg)

(http://s25.postimg.org/kf39eyk73/20141202_131829.jpg)

(http://s25.postimg.org/bdtbf3bnj/20141202_190646.jpg)

(http://s25.postimg.org/aydg8c0cf/20141202_190652.jpg)

Looking Nice!

Wow I love that that. !! :D

This build is going painfully slow  ??? :( :'( :'( :'(

Too much detail work on the topsides  :violent:

Hatch Cover done

(http://s25.postimg.org/u5jl833y7/20141202_210356.jpg)

Made some stickers on my home ink-jet printer using sticker photo-paper

(http://s25.postimg.org/3zsc5jni7/20141202_211641.jpg)

Formers for balance topsides - Cockpit and Turtle Deck

(http://s25.postimg.org/assp1tebj/20141203_112414.jpg)

The difficult part about adapting in corro from a balsa kit is you have to re-invent continuously. It's easy-ish on a normal build, the moment all the topsides, detail come in .......

(http://s25.postimg.org/do5s8oibj/20141203_162007.jpg)

Cockpit

(http://s25.postimg.org/oc9j7isan/20141203_171358.jpg)

(http://s25.postimg.org/4ixfetewv/20141203_171441.jpg)

I see you're doing the word "scale" justice. Very nice details!

 :thumbsup:

:thumbsup:

:thumbsup:

Thanks Maahin. Not too much justice, I'm essentially an outlaw  :rofl:

Ashok-ji  :thanks:

@sanjayrai55,
Sir,
You have now set a new standard for coro builds  :salute:

Iyer sir: Coming from you that really means a lot!

Thank you sir  :salute: :salute: :thanks:

So much dedication to this hobby.....

Thanks Kapil. Dedication is a big word - I'm just a 59 year old schoolboy making up for wasted time  ;) ;)

Cockpit & windshield

(http://s25.postimg.org/bmey5ag1r/20141204_094357.jpg)

(http://s25.postimg.org/meh3y4kvz/20141204_124448.jpg)

Like an open jeep has a rollover bar, this has a Rollover Pylon! Funda is if it rolls over on landing, the pilots don't break their necks  >:D

From Wikipedia:

"The PT-19 series was developed from the Fairchild M-62 when the USAAC first ordered the aircraft in 1940 as part of its expansion program. The cantilever low-wing monoplane with fixed landing gear and tailwheel design was based on a two-place, tandem-seat, open cockpit arrangement. The simple but rugged construction included a fabric-covered welded steel tube fuselage. The remainder of the aircraft used plywood construction, with a plywood-sheathed center section, outer wing panels and tail assembly. The use of an inline engine allowed for a narrow frontal area which was ideal for visibility while the widely set-apart fixed landing gear allowed for solid and stable ground handling."

"......was gentle and forgiving. It did have a temper,
however, and if you stepped on the brakes too hard, she'd nose over.
there is a "roll over" pylon between cockpits to counter this
effect."

(http://s25.postimg.org/duxq0dcjj/20141204_124501.jpg)

(http://s25.postimg.org/a8nb9zgsf/20141204_124509.jpg)

(http://s25.postimg.org/mxhltnmwv/20141204_124553.jpg)

Next up, the main Landing Gear

(http://s25.postimg.org/fy3juamyn/20141204_161343.jpg)

59 year old school boy. :giggle: :giggle: :bow: :bow:.sir one doubt are you addicted  to coro :headscratch:.

I have built as many Balsa models too; earlier Nitro and recently (in the last 1 1/2 years after returning to the Hobby) Electric.
I have also built 4 FT Depron models.

But yes: all factors considered, strength, weight ease of building I feel Corro (in a composite material build) is the most economical and rugged - for models 800 grams to 3 Kg and power 250 Watt and above

Sire, once you have finished playing with this beauty, could you please keep her for me? :hatsoff:

Sir I  think in our forum you are the one who teach wide possibilities of coro. :salute:

Quote from: VC on December 04, 2014, 07:29:07 PM
Sire, once you have finished playing with this beauty, could you please keep her for me? :hatsoff:

VC boss! You come to Gurgaon and stay and fly with me and it is yours :D

Pre order from vc sir. :giggle:

Quote from: shijin ps on December 04, 2014, 07:29:49 PM
Sir I  think in our forum you are the one who teach wide possibilities of coro. :salute:

Sam (samlikesspad) Sandeep Bajare and a Doctor in Indore - all make really good Corro models. I have however enjoyed some success with adapting mid-sized Balsa/Nitro to Corro/Electric

Oh Sam sir from Kerala am I right?. you peoples are the coro specialists.

Quote from: sanjayrai55 on December 04, 2014, 07:32:05 PM

Quote from: VC on December 04, 2014, 07:29:07 PM
Sire, once you have finished playing with this beauty, could you please keep her for me? :hatsoff:

VC boss! You come to Gurgaon and stay and fly with me and it is yours :D

Adopting me Sire? (:|~

Arise, Sir VC  ;)

Sam (samlikesspad) Sandeep Bajare and a Doctor in Indore - all make really good Corro models. I have however enjoyed some success with adapting mid-sized Balsa/Nitro to Corro/Electric


Have to show Flying Doc this!
He's been off the forum for quite a while. But was flying this Sunday.
I think his last coro was called Ultra Ugly.
Or at least should have been!

Aah, yes of course. You must be flying with him. He doesn't seem to visit the forum much nowadays

I just fished out my pt19. Its a small plastic model from Cox with a nitro engine. I hope Iyer remembers it as he was the one who flew it at Parade Ground, Secunderabad most probably in 1992 when we were both posted in Hyderabad.

Someday will convert it to electric rc.

@Sanjay Sir. The fuselage is already a beauty with perfect curves.

@Baijal Sir. Let it be with cox only please do not covert to electric.

In fact, the first ever engine model I owned was the Cox PT 19!!! Was in Class 7 then. Before that had built the usual Gnomes and Magpies, Yellow Birds and Bobnis  ;D :D

Sandy sir,  :thanks:

The fuse lower part also is supposed to be curved, but I'm not doing that. Too much work, and don't want to increase weight

Nice awesome build sir. I question: what's is the tail made of is that a depron sandwiched between Coro .?

Can u explain wing construction .?

I have not started the wing yet, but it will be a part of this log. I have posted many corro models and their wings - have a look at those

In any case, the adaptation of balsa plans to corro wing is too difficult to document; many things are done on TLAR basis

Quote from: radiocraft on December 05, 2014, 09:08:11 AM
Nice awesome build sir. I question: what's is the tail made of is that a depron sandwiched between Coro .?

The tail is made of corro, simply. 4 mm. I have covered with Vinyl as written clearly in the log

Read this radiocraft:

Quote from: sanjayrai55 on December 01, 2014, 07:07:01 AM
I used 2 mm lite-ply for doublers.

The main landing gear bock- I have tried to design this so the impact of landing is transmitted over the largest possible area on the fuse

The ply doublers are glued with SR 998

The butt and fillet joints are glued with hot glue

Fuse & tail feathers 4 mm

Did not have yellow 4 mm corro for tail feathers so covered with thin vinyl (it comes in different varieties)

Main LG installed with 3 mm Allen Bolts

(http://s25.postimg.org/9etaoorlr/20141205_091658.jpg)

Wheels fitted with 4 mm axles & wheel collars

(http://s25.postimg.org/r7euwk8u7/20141205_091711.jpg)

Pilot thrown in for luck  :giggle: :giggle:

(http://s25.postimg.org/q6em7frun/20141205_091643.jpg)

I used 2 3/4" (70 mm) main wheels, and will use a 30 mm Tail Wheel

Wing mark-out started

In this build, adapting from a balsa design to corro, the rough break-up of time spent:

Conceptualization, calculation, planning: 40 %
Marking:                                           20 %
Building:                                           40 %

(http://s25.postimg.org/pr3cef5xb/20141205_114626.jpg)

This is going to be a beautiful bird. Very detailed build log {:)} {:)}

Thanks Maahin :D

Beauty as they say lies in the eyes of the beholder  ;) ;)

As for me - I just hope it flies  ??? ??? :-[ :-[

Have to say sanjay sir your a master in building planes no matter what you can create any plane !!! :D
:salute::salute::salute::salute:.
Regards,
Aman. :hatsoff:

Thank you Aman  :thanks:

The dihedral for the wing is not specified  ??? ???

So, I found the dihedral brace in the drawing, and by extending the arms found the angle was 15 degrees, which translates to approx. 3.3" per side  8-) 8-) :o :o :o

I decided to go with 2" per side. More dihedral makes the model easier to flt - the ''bell'' effect - but less nimble and aerobatic. Seeing it's a scale model of a trainer (although a low-winger) decided to settle midway  ;D

(http://s25.postimg.org/ibd9k3wzj/20141205_203638.jpg)

The wing is:

Swept back at the LE
Swept forward at the TE
Tapered

Made the spar first. Used 9 mm balsa (because I had it  ;) ;) :rofl:)

(http://s25.postimg.org/cbpiggc73/20141206_135659.jpg)

A fair bit of geometry to get the loci of the wing boundaries

(http://s25.postimg.org/mhy3zfwlb/20141206_135815.jpg)

(http://s25.postimg.org/m6gnmog5b/20141206_185633.jpg)

I leave the wingtips open, or make a tip block in thermocole for most of my corro builds. This guy demanded a built up tapered wingtip. So, here goes; let's try and explore what happens  ???

(http://s25.postimg.org/n1378pnzz/20141206_185639.jpg)

(http://s25.postimg.org/sb860088v/20141206_185735.jpg)

(http://s25.postimg.org/6eq8ddkfz/20141206_190056.jpg)

(http://s25.postimg.org/srxz06ldr/20141206_190102.jpg)

The aileron is made from 2 pieces of 3 mm corro glued together. Then one side flute top and bottom is cut away to make the hinge. I would have preferred just a single 4 mm, but did not have it in yellow  >:(

The wing itself is 3 mm Corro (actually 2.6 mm as measured)

(http://s25.postimg.org/pmdd9z2rj/20141206_190117.jpg)

By when do you plan to maiden this? Hopefully, I'll be around when you do  8-)

Sanjay sir  how much she weights now? Power plant confirmed (Will go with a 3536-1250 probably with a 10*7 eProp) or not?

Maahin: It should be ready for the next weekend of 13/14th Dec. However I am travelling on the 11th evening (the day you reach) and back on the 14th morning

Shijin: Until the wing is ready, I won't really know

But these are my rough estimates:

Fuse with tail: <600 gm
Wing: < 400 gm
Power Pack: ~450 gm

Total: 1350-1450 gm

If it's below 1400, the 3536-1250 (about 20 size) is OK, else I might go with a 3542-1250 (about 25 size.)

(http://s25.postimg.org/vd3jnparj/20141206_203656.jpg)

(http://s25.postimg.org/vd3jnparj/20141206_203656.jpg)

(http://s25.postimg.org/kozsov0sf/20141206_205235.jpg)

So, are you flying on 14th? Or the Wednesday after?

Not sure. But will inform you

coming up very well chief

Thanks Girish. We should be flying it soon. Hope it flies :D

Cut-outs for wing servos. Used 10 g MG TGY

(http://s25.postimg.org/kf1xgdhvj/20141207_062348.jpg)

Wing halves folded over and glued

(http://s25.postimg.org/71ysdrd1b/20141207_101352.jpg)

Wing completed

(http://s25.postimg.org/5ln9vma4f/20141207_192124.jpg)

Wing weight: 372 gms.

(http://s25.postimg.org/prqrui5rz/20141207_192142.jpg)

Looking good! The wingtips also look nice!

A well crafted wing. {:)} :bow: :hatsoff:

Well i love you sir and your plane.
Regards,
Aman.

 :thanks: friends

Yeah, really nice wing. For equally nice fuselage (and instrument panel).
Was wondering why bootlegger is prop hanging, before realising the pic is sideways!  ;D

 :rofl: :rofl: :rofl:

Iyer sir - Bootlegger full of moonshine  :rofl:

The model is complete  ;D

I'm having some problems with my Imaging Software - postimage.org. Hopefully it should be sorted out soon  >:(

Congrats on that hope to see the pics soon.

your making gave me so much insight and confidence to build. most doubts get cleared easily

+1 iwincar sir.Sanjay sir's build log can guide a lot of beginners in Coro building (I am also a beginner).we must honor his effort (it's so difficult taking pic while building and uploading with details) for making build logs which includes every fine details of the model he always give the link to plans that's great.i think Sanjay sir can publish a book about possibilities and techniques of  Coro building.eagerly waiting for his new maiden video. :salute: You sir. :hatsoff:

Thanks guys :D

Fitting control rods, servos, horns etc.

(http://s25.postimg.org/yvts8owqn/20141208_102735.jpg)

(http://s25.postimg.org/7z9t0ddxb/20141208_102713.jpg)

(http://s25.postimg.org/ky2vva0u7/20141208_102720.jpg)

(http://s25.postimg.org/t4uvmuqwv/20141208_123554.jpg)

(http://s25.postimg.org/72zzz2h1b/20141208_102728.jpg)

Closed up

(http://s25.postimg.org/5j7zmivun/20141208_112938.jpg)

(http://s25.postimg.org/hh0tsb1rz/20141208_194522.jpg)

(http://s25.postimg.org/dlxfpqim7/20141208_194450.jpg)

The AUW with a 3300 mAh LiPo is 1.57 Kg. I'm going to use a 3542-1250 KV motor

(http://s25.postimg.org/tlg39aenz/20141208_194458.jpg)

oh I love this plane and your sir !! :D

OMG....... That's perfect and beautiful. .  (:|~ (:|~

nicely finished  {:)} waiting for flight video  :) and add a engine sound generator

 :thanks: Aman, Kapil, Sahil

Very nice build Sir. Looks great. Waiting for the video.

Asupan

Thanks Asupan

The hatch has been built very thoughtfully I must admit Sanj... Attention paid to every minute detail... The Lipo is definitely not going anywhere this time..

Nice one.. each build gets better..

Quote from: sanjayrai55 on December 04, 2014, 08:10:58 AM
This build is going painfully slow  ??? :( :'( :'( :'(

Too much detail work on the topsides  :violent:

Too much detail work everywhere Sanj.... leave alone just at the top..   You are becoming a "Corro" perfectionist..  Will be flying a life size soon at this rate! :)

Just having fun playing in my sandbox :D

:)  Keep on Sanding..:)

Finally after a week or so the fog lifted enough to maiden! There was a stiff icy wind - between sorties you just keep your hands in your pockets to get your fingers moving again  ;)

http://www.youtube.com/watch?v=6aRrGk2yV1c#ws (http://www.youtube.com/watch?v=6aRrGk2yV1c#ws)

The model climbs on throttle. I'm putting some downthrust - hope it improves else would have to decrease wing incidence

Else the flying is good, fun. The Aileron, rudder and elevator throws were all too high.

Hopefully if the weather holds will fly it tomorrow again after adjustments

Would you guys be meeting tomorrow at IFFCO grounds? I missed today... (lazy me) :(

Yes

Super...what time do you start? I'll take an extra hour to reach since I'll be coming from Paschim Vihar!

If there is no fog then 8 - 8:30 am. Please don't post these questions on this thread, they should be on the RC Bolt thread

Before Maiden:
(http://i1259.photobucket.com/albums/ii555/maahin_beri/IMG_20141220_093350_zps86066754.jpg)

After Maiden:
(http://i1259.photobucket.com/albums/ii555/maahin_beri/IMG_20141220_093811_zps4958944e.jpg)


Smile says it All!! 

A "Happy Pilot"..:)

Deepak sir,
That smile is because he saved it despite too much throw.
Sanjay sets an example that is difficult for ordinary folks to follow.
And then he raises the standard...
Henceforth we will never be able to post pics of a model that doesn't have a full cockpit interior...

Sanjay sir, unbelievable .... Very inspirational 👌👌👌

Iyer Sahib,
Sanjay's standards are higher than mine.... I just love to fly anything that can fly regardless of a "Cockpit" leave alone its interior...... Just an "ARC" with a thick black marker pen does the job on my Depron models.... as long as they fly..

Thanks Dee, Iyer sir and Mohan. Iyer sir, don't put me up on that Chhanna ka ped!  :giggle: :giggle:

Done the adjustments - let's see how she flies today - if the fog lifts

Flew super! Lots of pics and vids to follow  ;D

Sanj Sir waiting.

Been following the build from the beginning.
The amount of detail given is just unbelievable.
My plane is built with no perfection, My father pointed out so many mistakes although he is not a modeller LOL. You are great sir.

Thank you Nitesh. Please don't get disheartened. I have spent over 30 years in Engineering Manufacturing: you have a gloriously long and happy road ahead of you. When you get time and have built some 10-12 models you will be even better!

(http://s25.postimg.org/djq09jgsf/P1030466.jpg)

(http://s25.postimg.org/kbgfce5rz/P1030527.jpg)

(http://s25.postimg.org/i4c6oh0hr/P1030520.jpg)

(http://s25.postimg.org/f1bgl3lj3/P1030519.jpg)

(http://s25.postimg.org/6mvtx0khr/P1030652.jpg)

(http://s25.postimg.org/m5t9u4ssf/P1030654.jpg)

(http://s25.postimg.org/ispml5olb/P1030673.jpg)

(http://s25.postimg.org/tpmcw6lz3/P1030677.jpg)

(http://s25.postimg.org/z4zoaw2wv/P1030621.jpg)

It's a wonderful plane. No bad characteristics at all. Flies as stable as a trainer, but pretty aerobatic as well.
Nice build sir  :thumbsup:

 :thanks:  Maahin!

Here's the video. It was cold, the maximum temperature yesterday was 15 deg. C, at that time about 7 deg. Girish flew half, while I warmed my fingers; I flew the other half while he warmed his  :rofl: :D :D


http://www.youtube.com/watch?v=Lip-fC62pEI#ws (http://www.youtube.com/watch?v=Lip-fC62pEI#ws)

@sanjayrai55
Sir, kindly post youtube link.
For some reason i'm unable to see embedded videos on my iPad, getting only sound.
Eg, "Flying so much better. Put some down trim..."
Regards

https://www.youtube.com/watch?feature=player_embedded&v=Lip-fC62pEI (https://www.youtube.com/watch?feature=player_embedded&v=Lip-fC62pEI)

If you right click on the video, you will see options

Iyer sir: are you able to see the flight photos?

Thanks.
Lovely. Smoothness noticeably improved.
Surprised at the duration. Obviously using quite low power.
Kitna deti hai?
Kaafi!
(Photos visible. Problem only with videos)

Thanks Iyer sir  :thanks:

I use a 3000 mah 11.1 V LiPo, 20 C. This gives 8-9 minutes of normal flying, which is at about half throttle, or about 200 W. This model weighs about 1.6 Kg (3.5 lbs) I've used a 3536-1250 KV  with a 10*7 prop

 :goodjob:
Saw video today. Just beautiful.  :thumbsup:

 :thanks: Ashok-ji

What a build Sanjay sir !!!!!  :bow: :bow: :bow:
very steady and gentle and nice flying too!!!!!

can anybody please tell me where to fly rc planes in delhi

Thank you Praveen :D

Sir, I am not disheartened at all actually encouraged.

Quote from: rcrcnitesh on December 22, 2014, 12:59:45 PM
Sir, I am not disheartened at all actually encouraged.

Good man Nitesh!  :thumbsup: :thumbsup: :thumbsup:

Nitesh, if you build a balsa model or two you will improve your building skills and understanding of model aircraft design and construction factors tremendously

Thanks sir, will ask my pa for a guillows kit.

Besides Guillows there are many options. If yo want to make a RC model, RCB has several Laser Cut Kits too

If I crash a balsa plane it would be a waste i should learn to fly first.

if u have drawing kindly supply the same to me

kp

You must make an attempt to search.
Here are 10 plans from 21" to 72" span
http://www.outerzone.co.uk/search/results.asp?keyword=Pt-19&Submit=Search (http://www.outerzone.co.uk/search/results.asp?keyword=Pt-19&Submit=Search)

she is a beauty :hatsoff:

Thank you Rohit!

Fellow Rcers, Rohit is my first cousin, lives in Mumbai. We started RC together. Although I was in Delhi and he in Mumbai, we still managed to build a lot and fly a lot together  ;D ;D

Thankyou Sanjay 4 such inspiration .. a 19 that's cool - happy

That is kind of you GB  :thanks: :thanks:

But nonetheless, India will not lose this time to Oz in the current (Boxing Day) Cricket Test Match  :giggle: :giggle: ;) ;) ;)

Link to gallery

https://postimg.cc/gallery/q5r3s030/