RC India

This is a design of Matsumoto, Pilot's famous designer

Originally meant for 3 Channel control (Throttle, Rudder, Elevator) and Balsa with a 10-15 Nitro Engine, with 1.3-1.4 Kg weight, it has been adapted in Corro, with a 2836-1500 KV Brushless Motor, and a 9*6 e-Prop; I have added Ailerons as a 4th Channel (reducing the dihedral)

The wing is 44" span and 8" chord

(http://s25.postimg.org/793f3mzpb/IMG_20160123_064807_HDR_1.jpg)

True Flat-bottomed wings in Corro are not easy to get, and not always desirable too from the build viewpoint. I normally keep TE-Spar flat, and let Spar-LE form its natural curvature

(http://s25.postimg.org/ngeaxfw3j/IMG_20160120_063219_HDR_2.jpg)

And now, this raises an interesting question on wing incidence and AoA

The designer (the great Matsumoto) intended the wing to lie flat, and the wing bottom to be parallel to the Horizontal Stab.

But now the wing centre line is not parallel, although 2/3rds of the wing ie from Spar -> TE is!

(http://s25.postimg.org/ambnqcta7/IMG_20160120_061026_HDR_1.jpg)

(http://s25.postimg.org/59mtc85dr/IMG_20160120_061011_HDR_1.jpg)

(http://s25.postimg.org/3tbau32gv/IMG_20160120_061017_HDR_1.jpg)

So my question, dear reader, is do I try to keep the wing C/L parallel or leave the flat part parallel? Waiting to hear the views of experts and non-experts alike  ;)

Tried a new Wing Tip construction

(http://s25.postimg.org/xqc4ixwlb/IMG_20160114_200058_HDR_1.jpg)

(http://s25.postimg.org/yepkfmkov/IMG_20160114_200158_HDR_1.jpg)

Flat on top, tapered on the bottom

(http://s25.postimg.org/gebrxi33z/IMG_20160123_071118_HDR_1.jpg)

(http://s25.postimg.org/ro4hsg85b/IMG_20160114_195948_HDR_1.jpg)

Weight without LiPo and vinyl trim, aileron pushrods & servos etc.

The AUW is 1020 grams

(http://s25.postimg.org/w3mwxpkjj/IMG_20160123_064757_HDR_1.jpg)

(http://s25.postimg.org/cj8duxjy7/IMG_20160123_064820_HDR_1.jpg)

(http://s25.postimg.org/793f3mzpb/IMG_20160123_064807_HDR_1.jpg)

As usual beautiful Rai saheb.. some day I will visit your place.. :)

Excellent build sanjay rai sir  {:)}  {:)}

That such a simple model can look so pretty is a tribute to the designer and the builder.

Superb model sir !!
And the decals look great ,

Sir,
Excellent build!
maiden this coming saturday??

wow.. Sanjay Sir... as usual superb build... can you pls send some more pics of these to my email as would like to post this our facebook page..

regards
sujju

Thank you, and lloking forward to that Johnny. Come soon :D

Thanks Gaurang

Thanks Iyer sir. Surprised you did not comment on Reply #4 above

Thank you Prabal. Too much fog, and heightened security, let's see

Sure Sujju. The plans are on outerzone.co.uk, and I've PM'd you a link to the pictures

Repeating the question posed in Reply #4 above:

So my question, dear reader, is do I try to keep the wing C/L parallel or leave the flat part parallel? Waiting to hear the views of experts and non-experts alike  Wink

Thanks so much. Is your Wai the same one if one is going from Pune to Satara?

One more Masterpiece from the Coro King .... Excellent build sir ... Awaiting maiden video.

Thanks Doc  ;D

Doc Nayeem: you've been making out with plenty of hot models yourself  ;)

so the new wing chord looks like a inverted simplex airfoil  :headscratch: wait you said the wing bottom part should be parallel to horizontal stab.

Sanjay sir, no words! Your building skills are unparalleled ! This one is a chic ! Love it!💖💕💘💘💘💘

Didn't respond, as with your experience you know what will happen in either case.

Instead I'll tell you what I did with my Sunbird, which, with a flat bottom airfoil, was loopy under power.

Since I didn't want to add nose weight, or reduce the decalage, I mixed 10% down elevator with throttle.
Works fine!

Thanks Sanjay Sir .... Inspired by you ... But the beauty, accuracy and speed of your builds are hard to match ..

Thank you S174! I hope it flies too ;)

<sub>[/quote]

Didn't respond, as with your experience you know what will happen in either case.

Instead I'll tell you what I did with my Sunbird, which, with a flat bottom airfoil, was loopy under power.

Since I didn't want to add nose weight, or reduce the decalage, I mixed 10% down elevator with throttle.
Works fine!

[/quote]</sub>

Interesting. But I think I will first try as it is (likely to climb) and then add packing under TE if climbing is excessive. Let's see

I guess it's difficult to predict the exact change in behavior - the slightly semi-symmetrical wing will reduce lift compared to the flat-bottom, and the increased AoA should compensate??

Hey Doc! Thanks!

Sahilkit, keep  :headscratch: :headscratch: away  ;D

That's probably the most likely scenario!

BTW, sir, every time you produce a new model, I get encouraged to shake off laziness and build a new one too. Must be having the same effect on many forum members.  :hatsoff:

Waiting for your builds Iyer sir  ;D

 :P i think either wing setups should work provided the angle to attack is adjusted.

Edit: Sanjay the smallest rc plane you built in coro?

Sahil

This a message to sanjay sir: (really guilty)
To sir,
i gave up on spads after crashing the avi the 6Th time. ;D  ;D  ;D
Thank you.

P.S-I think my avispad ( air alaska N7572) has been petrified by the ghost of the spads.

@sanjayrai55 sir,

Thanks for the encouragement.

This is what I managed tonight.
If I do build it in the next two days, will post a separate build log.

Not bad for a sketch, eh? Even looks recognizable (I hope) ;D

Sahil, the smallest I've built is the QB 10, 39", and highly aerobatic: everyone's favourite on our field. In fact, I've built two of them  ;D. Uses the same power system as the Junior 100

(http://s25.postimg.org/r251by8cf/P1030263.jpg)

(http://s25.postimg.org/71vof2rlr/P1030985.jpg)

Iyer sir: that model has no business on the drawing board! Put 'er in the air  >:D (:|~ (:|~

Prabal, these things are normal, and not anything to get worried about

I suggest you build another one; just stick to the plans, and make an extra effort to build it true and square  :thumbsup:

allright sir!
making a piper cub now!

Don't

Make an Avispad, and make it well

As usual...Maestro at work..Another masterpiece in creation.. Nice Sanj! :)

Thanks Dee

Just remembered there was no video in this log  ;D

https://youtu.be/VTrGWuTZ76o (https://youtu.be/VTrGWuTZ76o)

Rai Saheb ..  :thumbsup:

Not a good landing though  >:(

supreb sir !

 :thanks:

Nice flying there Sanj... It seems like a fine flyer..Loops etc all good.. I am sure you are are landing it better.. Quick touch down without flairing always happens when filming..:)

Thanks Deepak

Awesome decals.  Beautiful plane.  I think wing loading is also high. About 14-15?

Can I use these decals on my plane with your permission sir?

I have that plane now.
Still flying.
Wing loading is not that high.
Will calculate and get back.
Regards

Oh.  Ok.  Thanks.

Please do :)
These are just sign vinyl, cut to size

And yes, Prabal took the model from me many months ago, and is happily flying it :D :D

Wing Area =   
22
dm²       
Weight =   
1100
g       
 Calculate

Wing Area =   
341
sq. in.      
Weight =   
38.8
oz.      
Wing Loading =   
16.4
oz. / sq. ft.


50
g/dm2
Wing Cube Loading =   
10.6

Too low a wing loading means the model will fly like a floater, and not at all scale-like. That is good for a rank beginner, but these models'response is sluggish, and they aren't much fun to fly

The Junior can do most things - loops, rolls, inverted, vertical charlies etc. Speeds are very  scale-like

Link to pictures

https://postimg.cc/gallery/1ml9vhcyk/