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« on: September 14, 2018, 09:50:17 AM »
sanjayrai55
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I got a canopy for the Sig 4 Star fr om Sig Mfg., USA

The original is a built-up Balsamodel covered with heat-shrink covering

I'm trying to do it with a Balsa-sheeted Foam wing, and a Corro fuse and tail

Also, the original uses a single aileron Standard Servo, I'm going with 2 X 19 gm MG
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« Reply #1 on: September 14, 2018, 09:50:51 AM »
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https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcSHBPaowCHPtqbCkCanwsHBK-bWCXGbjICyqMV17HGGvbd8Xy_JSg
Sig Four Star 40 (modified)
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« Reply #2 on: September 14, 2018, 10:07:43 AM »
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https://s25.postimg.cc/f8qzwdb73/IMG_20180906_091813088.jpg
Sig Four Star 40 (modified)


https://s25.postimg.cc/crf8p46q7/IMG_20180906_091827334.jpg
Sig Four Star 40 (modified)
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« Reply #3 on: September 14, 2018, 11:23:57 AM »
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https://s25.postimg.cc/4yokx58gv/IMG_20180906_164850116_LL.jpg
Sig Four Star 40 (modified)


https://s25.postimg.cc/7awkucv8f/IMG_20180908_112838231.jpg
Sig Four Star 40 (modified)


https://s25.postimg.cc/c9k38wegv/IMG_20180909_055606035.jpg
Sig Four Star 40 (modified)


https://s25.postimg.cc/dbu9re7jz/IMG_20180910_161449944.jpg
Sig Four Star 40 (modified)
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« Reply #4 on: September 14, 2018, 11:25:33 AM »
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https://s25.postimg.cc/mjmi841rj/IMG_20180910_173933863.jpg
Sig Four Star 40 (modified)


https://s25.postimg.cc/ylhw29qfj/IMG_20180910_174303912.jpg
Sig Four Star 40 (modified)


https://s25.postimg.cc/ft60yombj/IMG_20180910_190806471.jpg
Sig Four Star 40 (modified)


https://s25.postimg.cc/68mebshjz/IMG_20180911_071234399.jpg
Sig Four Star 40 (modified)
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« Reply #5 on: September 14, 2018, 11:27:05 AM »
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https://s25.postimg.cc/4tktn3j1r/IMG_20180911_100545332.jpg
Sig Four Star 40 (modified)


https://s25.postimg.cc/tzlrtxzrj/IMG_20180911_100549232.jpg
Sig Four Star 40 (modified)


https://s25.postimg.cc/r5imgsfof/IMG_20180911_100556084.jpg
Sig Four Star 40 (modified)


https://s25.postimg.cc/yy9a8qqsf/IMG_20180911_100609581.jpg
Sig Four Star 40 (modified)
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« Reply #6 on: September 14, 2018, 11:29:30 AM »
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https://s25.postimg.cc/cmbhfbhdr/IMG_20180911_100616161.jpg
Sig Four Star 40 (modified)




https://s25.postimg.cc/6y56ogv1r/IMG_20180911_100829081.jpg
Sig Four Star 40 (modified)


https://s25.postimg.cc/wgxj1i9gv/IMG_20180911_122952525.jpg
Sig Four Star 40 (modified)
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« Reply #7 on: September 14, 2018, 11:30:42 AM »
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https://s25.postimg.cc/dolnxxksf/IMG_20180912_063932165.jpg
Sig Four Star 40 (modified)


https://s25.postimg.cc/nyo2x6idr/IMG_20180912_063941156.jpg
Sig Four Star 40 (modified)


https://s25.postimg.cc/3ran4xq27/IMG_20180914_054828242.jpg
Sig Four Star 40 (modified)
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« Reply #8 on: September 14, 2018, 11:32:02 AM »
sanjayrai55
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https://s25.postimg.cc/nlwor1xjz/IMG_20180914_054835600.jpg
Sig Four Star 40 (modified)


https://s25.postimg.cc/nlwor1xjz/IMG_20180914_054835600.jpg
Sig Four Star 40 (modified)


https://s25.postimg.cc/e2mzx0hlb/IMG_20180914_060743368.jpg
Sig Four Star 40 (modified)
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« Reply #9 on: September 14, 2018, 11:32:56 AM »
sanjayrai55
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https://s25.postimg.cc/es5s9daf3/IMG_20180914_060734912.jpg
Sig Four Star 40 (modified)
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« Reply #10 on: September 14, 2018, 03:38:02 PM »
sanjayrai55
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Specs:

Wingspan   59.75 in   1518 mm
Wing Area   604 sq in   39 dm²
Length   47 in   1194 mm
Flying Weight   4.75 lb   2150 g
Wing Loading   18 oz/sq ft   55 g/dm²
Radio Required   4 Channel, 4 Servos (not included)
Engine Required
2-Stroke .40 - .45 cu in (6.5 - 7.5 cc)
4-Stroke .40 - .50 cu in (6.5 - 8.2 cc)
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« Reply #11 on: September 14, 2018, 03:38:55 PM »
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The weight of 2150 gm is a challenge. Although I'm sure it will fly well even at 2500 gm
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« Reply #12 on: September 14, 2018, 08:26:39 PM »
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@sanjayrai55,
Two strips of double sided sticky tape, and adhesion at LE and TE?

Wish I had thought of that.

Such an elegant solution.

Never got around to building a balsa skin foam core wing, after failed attempts in early 80s.
Good to learn from a real innovator...
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« Reply #13 on: September 14, 2018, 08:36:37 PM »
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@sanjayrai55,
Two strips of double sided sticky tape, and adhesion at LE and TE?

Wish I had thought of that.

Such an elegant solution.

Never got around to building a balsa skin foam core wing, after failed attempts in early 80s.
Good to learn from a real innovator...
Kind words Iyer sir

However, the actual process was:

I first glued a 1.5 mm balsa strip to each face with 5 min epoxy
Then I sanded the faces as carefully as I could to get them square and flat
Next, joined them with regular Araldite
Finally, put a 5" wide "patta" of medium glass fibre, saturated with regular Araldite

Hope it doesn't do namaste while doing a loop or roll Wink

Sent from my Moto G (4) using Tapatalk
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« Reply #14 on: September 15, 2018, 12:59:44 PM »
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I meant gluing the skin to the core.
Not the centre joint   Grin
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« Reply #15 on: September 15, 2018, 01:04:56 PM »
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The balsa skin is glued to the foam core using regular Fevicol. The cut-outs are placed on top, with heavy weights, and allowed to dry for 24 hours

Sent from my Moto G (4) using Tapatalk
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« Reply #16 on: September 15, 2018, 01:05:22 PM »
sanjayrai55
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Gives a very strong and reliable bond

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« Reply #17 on: September 15, 2018, 01:06:37 PM »
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BTW, this is my first time with this kind of build too. 😉

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« Reply #18 on: September 15, 2018, 04:32:14 PM »
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Unsurprisingly, this thread has 186 views, and comment only from one - Iyer sir

My last build thread, Ugly Stik had 286 views and a comment from ....... Iyer Sir!


A year ago, my Fleet Bipe Log had 12300 views and 77 replies, from 18 different people

What has changed?

In fact, I haven't posted the log of my last build, a full sized Das Ugly Stik built in Corro to the original Phil Kraft plans. Just not worth the effort
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« Reply #19 on: September 15, 2018, 07:19:42 PM »
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Thats a clean build, I had seen such balsa wood in RCbazaar. I shall attempt this build technique .

@Sanjay sir, the reason for less traffic may be the Quad effect. More people are getting into quads, with major institutions and manufacturers promoting quad racing events only, and advertising such accessories.

Pure flying is taking a back seat.

In Whatsapp groups people mostly talk Drones , rarely talk planes, and very very rare helis .

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« Reply #20 on: September 15, 2018, 07:22:17 PM »
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I was wondering one thing, does this wing not require any spars ?

If it requires spars , how are you gonna put it in now ?
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« Reply #21 on: September 15, 2018, 07:26:06 PM »
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Dear Sanjay sir,
I do agree to your opinions that having good no. of views and not any comment/appreciation is a little disheartening...Though I personally  being a scratch builder, know the worth of such build logs. I have earlier also seen your build logs in corro and have loved them. My personal comment would be to keep going on with your build logs. I have seen people reacting to build logs on RC universe forum. Its totally different there. Mostly new people are into drones and traditional balsa kit building has been reduced due to foam building...But maybe in coming time the young generation of this forum will also evolve to appreciate such efforts when they understand the difficulties and joy of a balsa scratch building.

Best Regards,
Khushahal
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« Reply #22 on: September 15, 2018, 09:11:47 PM »
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@sanjayrai55,
@glidiator,

Welcome to the club!

Do you remember how you scolded me for putting up my Indore Bipe for sale due to frustration at lack of response?

Remember. You and flyingboxcar are the only ones getting responses from abroad.

How did I feel at the poor response to the 1 min /30 sec challenge, despite prize money offer?
How did Glidiator feel when he doubled the prize, and still no entries?
How did he feel when no entries for his rubber power workshop?

Your build logs need to be on RCGROUPS
You won’t believe the international response you’ll get.
From real experts and world champions.
I know because I’ve been there.
Time you did!
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« Reply #23 on: September 16, 2018, 10:42:58 AM »
sanjayrai55
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I was wondering one thing, does this wing not require any spars ?

If it requires spars , how are you gonna put it in now ?

No spars. Actually if you observe, we have a 1.5 mm X 450 mm cross-section of balsa doing the job of the spar!

Similarly, no dihedral brace
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« Reply #24 on: September 16, 2018, 10:49:13 AM »
sanjayrai55
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Pnkyjs, Khushahal, Iyer sir: very thought provoking comments

But, the reason I post my builds on RCI is with the intention of other aeromodellers getting encouraged to build. And corro is a wonderful material to build with, very economical and durable. With a bit of effort, Corro models don't have to be either ugly nor heavy

I'm not getting any younger, and guess I have only a few years more of building. So, I will continue to build and post on RCI. If a few get encouraged to try, my day will be made

If people participate and make the thread more interactive, it encourages others to read, and also participate; this then is a knowledge exchange
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« Reply #25 on: September 16, 2018, 05:36:17 PM »
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After some long months, today got the opportunity to visit my RCI in relax.
And what i see, one more detailed, beautiful build from Sanjay Rai sir.

Sir keep your good work.

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« Reply #26 on: September 16, 2018, 05:46:20 PM »
sanjayrai55
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Thanks Manoj!  Grin
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« Reply #27 on: September 16, 2018, 07:49:04 PM »
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@sanjayrai55,

Sirji, a small suggestion.
Don’t post the pics of the entire build in one post.
Post the pics one at a time, as the build progresses.
Giving viewers a chance to respond at the intermediate stages...
Regards
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« Reply #28 on: September 16, 2018, 08:23:21 PM »
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Such builds are treat to eyes..... and tonns of ideas  & motivation to make models.

Nicely built too many techniques used... Hot wiring, balsa sheeting, Wing joining without spar to name a few.
I am one of the prevailed ones to see it in reality.

regds
Saurabh

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« Reply #29 on: September 17, 2018, 05:16:31 PM »
sanjayrai55
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@sanjayrai55,

Sirji, a small suggestion.
Don’t post the pics of the entire build in one post.
Post the pics one at a time, as the build progresses.
Giving viewers a chance to respond at the intermediate stages...
Regards

Noted, sir.But needs more time Wink
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« Reply #30 on: September 17, 2018, 05:17:40 PM »
sanjayrai55
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Such builds are treat to eyes..... and tonns of ideas  & motivation to make models.

Nicely built too many techniques used... Hot wiring, balsa sheeting, Wing joining without spar to name a few.
I am one of the prevailed ones to see it in reality.

regds
Saurabh



Thanks Saurabh. Now you have no excuse not to build a scale corro model, especially as you are flying a 1/6 scale Corro Piper Cub
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« Reply #31 on: September 17, 2018, 05:55:30 PM »
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Rai sir after long time very excellent build by you specially balsa,coro and foam Clap Clap Clap


Regards
Gaurang
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« Reply #32 on: September 17, 2018, 05:57:17 PM »
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Thank you Gaurang-bhai  Grin
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« Reply #33 on: September 17, 2018, 06:46:21 PM »
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I made a servo tray. Normally I just glue 2 rails and screw the servos down on them. But this time I decided to go with the tray, so I could slide it forward and aft to set the CG

https://i.postimg.cc/7P5S8dXM/IMG_20180915_062801669.jpg
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The white servo (19 gm MG) is for throttle, others are rudder/tail wheel and elevator
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« Reply #34 on: September 17, 2018, 06:47:20 PM »
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Assembling the fuse in the Jig

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« Reply #35 on: September 17, 2018, 06:49:32 PM »
sanjayrai55
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Cut out slots and matching plugs to locate the tail parts accurately

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« Reply #36 on: September 17, 2018, 07:21:31 PM »
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« Reply #37 on: September 17, 2018, 10:20:33 PM »
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Love your jig.
If I had one, my fuselages would be square too
Instead of like Bananas  Grin
Regards
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« Reply #38 on: September 20, 2018, 05:38:26 PM »
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Iyer sir, make a Jig. It's easy  Grin
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« Reply #39 on: September 20, 2018, 05:39:30 PM »
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Push rods and formers

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« Reply #40 on: September 20, 2018, 05:41:16 PM »
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Turtle deck from 1.5 mm balsa and some 3 mm formers and longerons

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« Reply #41 on: September 24, 2018, 05:13:36 PM »
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Test fit

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« Reply #42 on: September 24, 2018, 05:14:31 PM »
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« Reply #43 on: September 24, 2018, 05:15:19 PM »
sanjayrai55
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« Reply #44 on: September 24, 2018, 08:58:42 PM »
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DIYer



Lovely build! And the pilot has a moustache!
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« Reply #45 on: September 25, 2018, 05:48:15 AM »
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 Grin Hi Girish
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« Reply #46 on: September 25, 2018, 05:52:48 AM »
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Covering of wing started

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« Reply #47 on: September 25, 2018, 03:16:20 PM »
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Сумасшедший об авиации



Beautiful build sir!  Smiley
Following the thread actively!  Wink
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« Reply #48 on: September 25, 2018, 06:01:01 PM »
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Thanks Prabal
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« Reply #49 on: September 25, 2018, 06:01:42 PM »
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« Reply #50 on: September 25, 2018, 06:02:16 PM »
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« Reply #51 on: September 25, 2018, 06:17:34 PM »
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Assembling the fuse in the Jig

https://i.postimg.cc/6Ts9DycS/IMG_20180917_174030559.jpg
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Jig idea is awesom. Will use in another way for my composite models. Thanks for sharing
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« Reply #52 on: September 25, 2018, 06:27:09 PM »
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You are welcome

Sent from my Moto G (4) using Tapatalk
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« Reply #53 on: September 25, 2018, 06:48:32 PM »
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When is it supposed to be in the air sir??
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« Reply #54 on: September 26, 2018, 04:47:11 AM »
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When is it supposed to be in the air sir??


Soon Wink  I'm in no hurry
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« Reply #55 on: September 26, 2018, 05:56:47 AM »
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« Reply #56 on: September 26, 2018, 05:59:41 AM »
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« Reply #57 on: September 26, 2018, 11:48:37 AM »
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Sir, is the tailplane stiff enough by itself?
Or have you inserted a skewer/ CF rod in the flute?
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« Reply #58 on: September 26, 2018, 12:04:42 PM »
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Pertinent point, Iyer sir

I have had flutter issues before too

What I do ( where feasible) is use 3 mm corro doubled, two sheets glued together with cyano

This renders it stiff enough, but finally will only know in the air. Worked OK on 40 size models till now

The 3 mm corro (actually 2.5 mm) flutes don't have enough room to insert a skewer or sizable CF Rod/tube. The maximum diameter admitted will be < 2 mm
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« Reply #59 on: September 26, 2018, 08:42:31 PM »
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Sir, is the tailplane stiff enough by itself?
Or have you inserted a skewer/ CF rod in the flute?


Dear KK Iyer ji,

I used 10mmx5mm thick wooden reaper instead of balsa wood running from nose to tail end in fuselage. It works good.
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« Reply #60 on: September 26, 2018, 08:48:37 PM »
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Dear Sanjayrai ji,

How do you fix the front wheel axle? In the first set of wooden supports or with the engine mount?
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« Reply #61 on: September 27, 2018, 04:34:58 AM »
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I'm not too sure what your question means, but will try anyway:

The engine mount/firewall will only be used for a nose wheel, with a tricycle landing gear

This is a taildragger. The main LG is bolted onto a 8 mm ply plate, which abuts the front former, and is glued to the former and the sides. Further reinforcement is given by two 10 mm pieces of balsa
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« Reply #62 on: September 27, 2018, 07:15:26 AM »
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« Reply #63 on: September 27, 2018, 07:16:03 AM »
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Just a little cramped, but everything did fit OK

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« Reply #64 on: September 27, 2018, 11:17:47 AM »
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Complete

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« Reply #65 on: September 27, 2018, 11:18:29 AM »
sanjayrai55
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https://i.postimg.cc/mhfQfyk7/IMG_20180927_105630725.jpg
Sig Four Star 40 (modified)
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« Reply #66 on: September 27, 2018, 11:47:23 AM »
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Very fine! All the best for the maiden
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gs
 

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« Reply #67 on: September 27, 2018, 04:08:33 PM »
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Thanks Girish Salute
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« Reply #68 on: September 27, 2018, 06:24:13 PM »
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wow.. simply elegant,,
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even crashing requires a flight......
 

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« Reply #69 on: September 27, 2018, 06:25:55 PM »
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wow.. simply elegant,,
Thank you. Hope it flies well

Sent from my Moto G (4) using Tapatalk
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« Reply #70 on: September 30, 2018, 05:03:46 PM »
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Had a very successful maiden

The model flew straight off the runway, with NO trims required!

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Sanjay - Gravity is my enemy
 

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« Reply #71 on: September 30, 2018, 05:05:48 PM »
sanjayrai55
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 The 4 star turned out really fantastic. Needed no trims at all.

Flies absolutely true, smooth and stable. Highly responsive to the controls

Probably one of the best Flying models I've ever built

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« Reply #72 on: September 30, 2018, 05:07:22 PM »
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Did stretch it's legs a fair bit

Loops, rolls, inverted, spin, horizontal loops - the works  Grin
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« Reply #73 on: September 30, 2018, 07:19:01 PM »
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Sir ,
looks factory made. Absolute craftsmanship.
flies great too.
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Russ-40 Trainer, Mr.moss, Pushler, Skysurfer, Mugi , F-22, Red swan, Xtra-300
 

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« Reply #74 on: September 30, 2018, 07:21:14 PM »
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Thanks Manoj. It was really a pleasure​ to fly

Sent from my Moto G (4) using Tapatalk
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« Reply #75 on: September 30, 2018, 07:21:42 PM »
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Beautiful build Sanjayji.....how is the Jig made are the stoppers pinned down .
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« Reply #76 on: September 30, 2018, 08:25:00 PM »
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Beautiful build Sanjayji.....how is the Jig made are the stoppers pinned down .
Thanks buddy. The jig uses thumb screws to hold down in place

Sent from my Moto G (4) using Tapatalk
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« Reply #77 on: October 03, 2018, 11:15:11 PM »
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Lovely Sir,  The model flies very well.... and guess you indeed took it to the limits....... The expression on the face of the pilot says a lot about it.... Drool Drool Drool Drool Drool
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Well I been into aeromodelling since I was in School....  had won the "WINGS Open" at "Bombay" (as it was known then) in 1985 for control line aerobatics (was doing my graduation at that time) and had received a big gold trophy....  Mr Bhivandiwala organised it and gave good awards.
Our team had won the following medals:-
1.   Gold for Control Line Aerobatics
2.   Silver and Bronze for Control line speed
3.   Bronze for Free Flight Glider
Sharma Models helped us train to win the medals
 

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« Reply #78 on: October 03, 2018, 11:53:17 PM »
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Don’t know how I missed seeing the videos for 3 entire days.

But I remember you started this thread with “I got a canopy...”

What a difference the canopy and pilot make, even to an otherwise professionally finished model.

All I can say is “Sirji, abhi aap me kafi dum baki hai”

An inspiration for many (including me) to talk less and build more!

Regards
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« Reply #79 on: October 04, 2018, 04:24:43 AM »
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Lovely Sir,  The model flies very well.... and guess you indeed took it to the limits....... The expression on the face of the pilot says a lot about it.... Drool Drool Drool Drool Drool
Hah ha! Thanks so much Shobhit!
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« Reply #80 on: October 04, 2018, 04:29:56 AM »
sanjayrai55
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Don’t know how I missed seeing the videos for 3 entire days.

But I remember you started this thread with “I got a canopy...”

What a difference the canopy and pilot make, even to an otherwise professionally finished model.

All I can say is “Sirji, abhi aap me kafi dum baki hai”

An inspiration for many (including me) to talk less and build more!

Regards


Thanks so much Iyer sir

The Canopy was affordable ( about $ 6~7) so I got it and the printed plans (about $ 5) shipped to my sister-in-law's residence in USA, and my wife had gone there and carried for me

Since even the local shipping is expensive ( when you convert to IRS Wink ) I ordered more stuff - the turtle deck, cowl and canopy of the Sig Kougar! That's going to be my next build, and the first I will be attempting without plans! (no plans available for the Kougar)
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« Reply #81 on: October 04, 2018, 04:35:46 AM »
sanjayrai55
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Sig Kougar

https://i.postimg.cc/mZCTXBV5/Ki20745.jpg
Sig Four Star 40 (modified)


https://i.postimg.cc/qMr4WS5M/kougarbluewhitered.jpg
Sig Four Star 40 (modified)
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Sanjay - Gravity is my enemy
 

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« Reply #82 on: October 04, 2018, 04:36:35 AM »
sanjayrai55
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https://i.postimg.cc/0j0R85B5/SIGRC35_2.jpg
Sig Four Star 40 (modified)


https://i.postimg.cc/QC3ZGKSn/yy1_SIGRC35_New.jpg
Sig Four Star 40 (modified)
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« Reply #83 on: October 04, 2018, 12:34:54 PM »
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Something like this?

97919437-969C-49F7-9D5A-B246E5A979A7.jpg
Re: Sig Four Star 40 (modified)
* 97919437-969C-49F7-9D5A-B246E5A979A7.jpg (69.32 KB, 800x600 - viewed 106 times.)
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« Reply #84 on: October 04, 2018, 01:05:20 PM »
sanjayrai55
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 Cheesy

Now where did that come from?
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« Reply #85 on: October 04, 2018, 01:06:01 PM »
sanjayrai55
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Do you have any of the cutouts from the printed balsa/ply sheets?
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