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« on: May 08, 2014, 06:46:40 PM »
sanjayrai55
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FT have plans for a park sized F22 Raptor. As I only get foamboard (too heavy) and biofoam (too weak) here, I have tried to make this from Corro - ergo, the Corraptor Cheesy

20140506_130630.jpg
Corraptor - 6th Entry for 2014 Sweepstakes
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« Reply #1 on: May 08, 2014, 07:02:23 PM »
sanjayrai55
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Printed the plans on A4 sheets and taped together. Fair bit of arithmetic to adjust the dimensions due to the difference in thicknesses. Also, no tabs for location

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« Reply #2 on: May 08, 2014, 07:06:33 PM »
sanjayrai55
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Used hot glue

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« Reply #3 on: May 08, 2014, 07:17:16 PM »
sanjayrai55
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Motor: 2826-1400 KV. Prop: 9*47 SF. Span: 660 mm. Expected weight without battery: 300-325 gms.

20140507_173615.jpg
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« Reply #4 on: May 08, 2014, 07:22:41 PM »
sanjayrai55
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Weight with Zippy 1300 mAh is 425 grams.

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« Reply #5 on: May 08, 2014, 07:28:26 PM »
sanjayrai55
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Time for the coloured tape  Grin Wink

http://s25.postimg.org/g97udl5xb/20140508_170612.jpg
Corraptor - 6th Entry for 2014 Sweepstakes


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Corraptor - 6th Entry for 2014 Sweepstakes
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« Reply #6 on: May 08, 2014, 07:30:00 PM »
sanjayrai55
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http://s25.postimg.org/do29q2gjj/20140508_132358.jpg
Corraptor - 6th Entry for 2014 Sweepstakes


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Corraptor - 6th Entry for 2014 Sweepstakes
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« Reply #7 on: May 08, 2014, 07:31:21 PM »
sanjayrai55
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Maiden this weekend. Hope she flies  Huh? Huh?

http://s25.postimg.org/ndpnmmd6n/20140508_132408.jpg
Corraptor - 6th Entry for 2014 Sweepstakes
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« Reply #8 on: May 08, 2014, 07:36:42 PM »
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Aaa haaa! The Sahib is getting colourful.
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« Reply #9 on: May 08, 2014, 08:34:25 PM »
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GRAND CLEARANCE SALE!
Brand New Models being given away!

(Hope to see such a post from Sanjay Rai sir on 16th May)
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« Reply #10 on: May 08, 2014, 08:44:50 PM »
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Sir
We want photos of ALL your models in one place.
Please start a new thread under RC People.
Suggested topic name: 'Asli Aeromodeller'
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« Reply #11 on: May 08, 2014, 09:09:03 PM »
sanjayrai55
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Re:

Iyer sir...I have already given away quite a few models. Space shortage, plus there were others whose need of the moment was greater than mine Smiley
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« Reply #12 on: May 08, 2014, 09:09:57 PM »
sanjayrai55
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Re:

I could post pics of all the models in one of your posts sir Wink Cheesy
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« Reply #13 on: May 09, 2014, 12:15:52 AM »
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Sahib, I can't get over that book rack in the background. What treasures does it hold?
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« Reply #14 on: May 09, 2014, 06:55:23 AM »
sanjayrai55
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VC, that is one of the book racks, This contains fiction, and a few reference books. Then in the next room, is a larger rack, with religion, philosophy and reference. Then under the stairs is another rack, only fiction. In my bedroom, there are some more on religion. In my younger son's room is the good stuff; comics, graphic novels, Archie, Tinkle, ACK, Star Wars, Lucky Like, full Tintin and Asterix etc. In my elder son's room are mostly management and technical stuff.

The library actually needs a proper place, and cataloging. Also some books need repair/binding. Have to do all this sometime  Head Scratching Head Scratching

Hoping one of my sahibzadas gets married, and I'll bribe my daughter-in-law to do it  Wink Giggle. Needs a woman's touch  ROFL

There's also the matter of several hundred DVDs and Music CDs
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« Reply #15 on: May 09, 2014, 09:27:21 AM »
sanjayrai55
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A member asked me how I stick corro. I'm replying here, in the hope it might be of use to others too.

1. Surface Preparation: Scuff up a little with Sandpaper. Then rub with NC thinner with a rag cloth. Corro when manufactured has a thin layer of Silicon Oil (mould release compound) on it

2.Adhesive - (a) Pidilite's SR 998 works very well. Apply a thin layer on each side, and let dry till it is tacky, nearly dry. Press the two sides together, and hammer lightly with your hand. Advantage here is you don't have to clamp. Especially useful for the long seam in the wings. The joint is also openable, with a very hard pull, but never has opened yet in service (with me)
                  (b) Cyano: Use thin Cyano. I find a product by Pidilite (again, and no, my uncle does not own the co.!) called Flex Bond works well. Put dots of glue about 1/2" apart; the low viscosity and wicking action ensures it spreads. Bonding is super-fast, and permanent. If you have to open the joint, it's likely the corro will tear.

For corro to wood, both work well.
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« Reply #16 on: May 09, 2014, 09:36:42 AM »
sanjayrai55
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Hot glue makes an excellent joint between Corro-Corro and on Depron too (if you are using a composite material build)

Clean as usual, then apply on one surface. The glue should be really hot : use a higher wattage gun. I use a 40 W Stanley, works good. It can (and should) melt the corro very very slightly, thus ensuring a weld-like bond. Flipside is it's heavy  Angry

But there are some places it's indispensable really. eg, bonding a turtledeck to the fuse sides. Conventional glues will have a poor bond because this is a butt joint, with one member having the flute edge being glued, presenting very little surface area.

I generally use a combination of all these methods depending on the location of the joint to be bonded
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« Reply #17 on: May 09, 2014, 09:56:54 AM »
sanjayrai55
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Another gentleman has asked me:

"Was wondering if you can help me with the source of coro in Delhi/NCR ?
I did get thin yellow 2mm sheets but they arent usable. I guess we need 3-4 mm with some more density ( GSM ) to it."

Any sign board maker can assist you with Corro supplies. But the wholesale market is in Paharganj, with m/s Pearl Plastics being one of the well known retailers.

When selecting Corro sheet (fat chance you will have this choice though, it's a take-it-or-leave-it attitude there) the sheet should be crisp and shiny, not spongy, nor brittle. Thickness is not all, there are at least two types of flute spacing, one close-spaced and one more distance-spaced. Obviously the close spaced one is heavier, but stronger.

Why do you feel 2 mm are not usable? Which model are you building? 2 mm is pretty good on wings up to 54" (my experience) and for fuselages with doubling on strategic stressed locations. Control Surfaces like Rudder, Elevator Aileron by their very nature need to be rigid; use 4 mm normal spaced or 3.5 mm close-fluted for this.

Good luck, and let us know your progress Cheesy
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« Reply #18 on: May 09, 2014, 11:16:25 AM »
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bootyfull Wink
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« Reply #19 on: May 09, 2014, 06:22:40 PM »
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Great build Sir. Nice and colourful! Grin
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Seagull Arising Star, Seagull Low Wing 40, AviSport (SPAD), Phoenix Scanner, VortexRC Speedster, Martian 220 Racing Quadcopter.
 

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« Reply #20 on: May 09, 2014, 06:32:24 PM »
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Now sir, please make a composite BAE Hawk (coro + thermocol) .... Mine will follow have been waiting to see someone build that...let it be your first edf... ( good news... electronics budget sanctioned... bad news... i wont make it in this sweepstakes...)
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« Reply #21 on: May 09, 2014, 06:40:32 PM »
sanjayrai55
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Thanks Girish. Maahin, I hope you don't have your eyes on this too  ROFL
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« Reply #22 on: May 09, 2014, 06:41:26 PM »
sanjayrai55
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Thanks Topalle. No more jet-type models for me for some time now Wink
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« Reply #23 on: May 09, 2014, 06:53:47 PM »
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I was not asking for a a jet-type but  a real jet. Ok, perhaps someone else will make it.
I haven't seen a single scratchbuilt EDF Hawk here...
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« Reply #24 on: May 09, 2014, 07:04:03 PM »
sanjayrai55
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I'm not really into jets, speed, that stuff
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