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Curare 20
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«
on:
January 26, 2019, 04:32:49 AM »
sanjayrai55
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Curare 20
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Thanks to a gentleman in Bangalore, Mr. Lingaraj, I have got hold of an incomplete MK Models ( Kato) kit of Hanno Prettner's legendary Curare, in a 20 size
It's a very old kit, and a fair number of parts are missing - fortunately mostly balsa/ply which can be replicated
About Prettner -
http://www.rcindia.org/rc-general-topics/hanno-prettner-living-legend-of-rc/msg297475/#new
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Reply #1 on:
January 26, 2019, 05:16:59 AM »
sanjayrai55
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Re: Curare 20
Curare 20
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Reply #2 on:
January 26, 2019, 05:18:47 AM »
sanjayrai55
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Re: Curare 20
Plans from Outer Zone
Curare 20
Curare 20
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Reply #3 on:
January 26, 2019, 05:20:07 AM »
sanjayrai55
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Re: Curare 20
Will be using an ASP 25 Glow Engine
Curare 20
Curare 20
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Reply #4 on:
January 26, 2019, 05:23:34 AM »
sanjayrai55
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Re: Curare 20
The plans only have the right wing, so, after 44 years I did some GT (Glass Tracing). Last done to copy Engineering Drawing Assignments in 1974-5
Curare 20
Curare 20
Now I've traced and pencilled a left wing on the reverse side of the plans ( a mirror image, so to speak)
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February 01, 2019, 05:53:37 PM »
sanjayrai55
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Re: Curare 20
Curare 20
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February 01, 2019, 05:54:14 PM »
sanjayrai55
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Re: Curare 20
Curare 20
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February 01, 2019, 05:54:58 PM »
sanjayrai55
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Re: Curare 20
Curare 20
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February 01, 2019, 06:38:29 PM »
K K Iyer
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Re: Curare 20
@sanjayrai55,
Sir,
Guess the dark wood is from the kit and the whiter pieces are new, right?
Is the original material balsa?
Regards
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February 01, 2019, 07:13:15 PM »
sanjayrai55
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Re: Curare 20
Quote from: K K Iyer on February 01, 2019, 06:38:29 PM
@sanjayrai55,
Sir,
Guess the dark wood is from the kit and the whiter pieces are new, right?
Is the original material balsa?
Regards
Correct on both counts sir
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February 02, 2019, 04:50:51 AM »
sanjayrai55
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Re: Curare 20
I have had very limited exposure to quality kits. In the late 80's, I had 2 OK Model (Pilot) kits, and a few years ago a Great Planes kit. This is my first MK Kato kit
I must say the balsa quality is exceptional! I have encountered 4 different grades of balsa, selected for the application. Even the ply, while being light, is extraordinarily hard. Brilliant kit maker, Kato
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February 02, 2019, 07:08:50 PM »
sanjayrai55
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Re: Curare 20
Curare 20
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February 02, 2019, 07:09:39 PM »
sanjayrai55
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Re: Curare 20
Curare 20
Curare 20
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February 05, 2019, 11:00:12 AM »
sanjayrai55
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Re: Curare 20
Wing ready for covering
Curare 20
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February 05, 2019, 11:01:46 AM »
sanjayrai55
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Re: Curare 20
Since I didn't have 15 mm thick balsa, made the wingtips from 3 different sheets glued together
Curare 20
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February 07, 2019, 04:35:42 PM »
sanjayrai55
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Re: Curare 20
The horizontal stab has an anhedral!
Curare 20
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Reply #16 on:
February 07, 2019, 04:36:43 PM »
sanjayrai55
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Re: Curare 20
Started the fuselage
Curare 20
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February 07, 2019, 06:29:12 PM »
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Re: Curare 20
just another awesome build by Sanjay sir!!
By the way how would anhedral stab affect how the plane flies??
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February 07, 2019, 07:18:54 PM »
sanjayrai55
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Re: Curare 20
I myself am not too sure
Looks cool, and Hanno Prettner said to use it
The most logical explanation I found was in RC Universe:
RE: anhedral on horizontal stab
An engineer once told me that the anhedral on the F-4 tail was to help with low-speed yaw stability. The tail of the F-4, like most airplanes, generates negative lift, so anhedral on the horizontal tail would actually work like dihedral for a wing (it's stabilizing). This seems to imply there is a tradeoff with yaw stability while inverted, which of course wouldn't be a problem for the F-4.
As for RC aerobatic airplanes, especially so-called 3D, I doubt it has any benefit. The anhedral adds effective side area to the tail, which is the same as adding more fin area. It does add it down low, however, which might help knife-edge tracking if it is done properly, but that's only theory, and I believe that was the thinking behind the Curare tail. I remember some discussion about it in the '70s (or was it the '80s?). It seemed to work, but then so do many other designs without anhedral. You would probably have to be an aerodynamicist or an avid experimenter to design it so there is any discernible benefit.
If you think it looks cool, a little bit probably will not hurt. Or if you think you need to redistribute the vertical stabilization area lower, it might help.
As for adding maximim side lift capbility, there would be no benefit at all, since adding tail area is stabilizing. Good knife-edge lift has a lot to do with the proper balance between area ahead of the CG and area behind the CG. All else equal, adding effective fin area, without changing anything else, will make it harder for the rudder to yaw the airplane and generate side-lift. Also, the length of each horizontal stabilizer/elevator would have to be multiplied by the secant of the anhedral angle to keep the same pitch effectiveness, which would of course increase weight slightly.
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February 07, 2019, 07:19:47 PM »
sanjayrai55
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Re: Curare 20
However for my (very limited) flying skills, I don't think I'll be testing, or valuating it's use
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February 07, 2019, 08:55:52 PM »
K K Iyer
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Re: Curare 20
Quote from: sanjayrai55 on February 07, 2019, 04:35:42 PM
The horizontal stab has an anhedral!
Curare 20
Sir that anhedral stab is the
signature
of the Curare.
With a flat stab it’d no longer be a Curare!
I’m glad you had one of the other unique elements - the thick fin leading edge.
Hope you have the chin block too...
Regards
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February 07, 2019, 09:31:13 PM »
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Re: Curare 20
great going sanjay sir.
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February 08, 2019, 04:28:50 AM »
sanjayrai55
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Re: Curare 20
Thanks Iyer sir; yes, the chin block and thick fin LE will soon make their appearance
Thanks Manoj. You are always encouraging
Right now I'm in an intense struggle: the design called for an oval fuel tank of 150 cc capacity, with the larger axis horizontal. Can get no such tank, nearest is a rectangular 180 cc. To fit that, there is fouling with the wooden engine bearers. So I've decided to use a Glass Filled Nylon mount. Which brings it's own complications in installing - tight space. I also want to use a steerable nose wheel against the fixed one supplied
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February 08, 2019, 08:15:47 PM »
K K Iyer
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Re: Curare 20
Sir,
A few suggestions
1. If you think 90cc will suffice, check out MD rum ka bachcha. I’ve been considering one for a 10 size model. It’s quite oval.
2. If you omit EM1 and EM2, there should be enough space for a round or square section tank. Without printing the plan, I’m not able to estimate the available space. Pl let me know. Then I’ll see if I have something suitable.
3. If possible, skip the steerable nosewheel. On such a small streamlined model it’s not worth the effort
4. If going radial, please finalise the holes in the firewall and mount the flanged nuts before starting the fuselage. The nose is complete on mine, and the flanged nuts epoxied to the back of the firewall. No way to make matching holes in the radial mount. I’m not able to bring myself to cut the cowl free! See pic.
5. If you don’t have 4 flanged nuts and matching bolts, let me know. I think I got some in 2006!
Re: Curare 20
F4E0F5EC-9CC5-4B7E-95FB-163ED520E403.jpg
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February 08, 2019, 08:23:50 PM »
sanjayrai55
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Re: Re: Curare 20
Quote from: sanjayrai55 on February 07, 2019, 04:36:43 PM
Started the fuselage
Curare 20
Iyer sir, the picture doesn't tell the whole story, but the FW is already glued in place, with blind nuts fitted. The Engine mount is also fitted, and the Sullivan flex 180 cc tank fits fine. 90 cc is too small for a 25 Engine. Just that everything is very cramped.
The cowl blocks will need multiple holes for tightening the Engine and mount bolts, and the exhaust bolts. Also, I'll be keeping the Engine upright, not at 90 degrees.
Regarding the nose gear, I'm still deciding.
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February 09, 2019, 04:43:59 AM »
sanjayrai55
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Re: Curare 20
Engine ( ASP 25) mounted with GFN mount: the wooden engine bearers are not used to accommodate the tank
Curare 20
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February 09, 2019, 04:45:00 AM »
sanjayrai55
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Re: Curare 20
Tank position
Curare 20
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February 09, 2019, 04:46:14 AM »
sanjayrai55
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Re: Curare 20
Firewall with blind nuts. I will be putting some triangular stock to reinforce
Curare 20
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February 09, 2019, 07:16:40 AM »
sanjayrai55
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Re: Curare 20
Tank fitment, 16 mm hole in firewall
Curare 20
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February 09, 2019, 06:38:44 PM »
sanjayrai55
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Re: Curare 20
Pressure test the tank for leaks
Curare 20
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February 09, 2019, 07:52:48 PM »
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Re: Curare 20
Sirji,
I see that you’re doing this test in your kitchen (Don’t think you have a microwave in the workshop)
Hence this tip.
“Do not try to warm epoxy in a microwave after it is mixed.”
But its ok to warm them in separate cupsbefore mixing
Regards
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February 09, 2019, 10:05:37 PM »
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Re: Curare 20
Quote from: K K Iyer on February 09, 2019, 07:52:48 PM
Sirji,
I see that you’re doing this test in your kitchen (Don’t think you have a microwave in the workshop)
Hence this tip.
“Do not try to warm epoxy in a microwave after it is mixed.”
But its ok to warm them in separate cupsbefore mixing
Regards
Sir pardon my ignorance on this but what is heated epoxy used for
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February 09, 2019, 10:52:54 PM »
K K Iyer
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Re: Curare 20
Quote from: Rooster on February 09, 2019, 10:05:37 PM
Sir pardon my ignorance on this but what is heated epoxy used for
There may be occasions when 5 minute epoxy is too quick and regular Araldite is too thick/ too slow.
And you don’t have the thin Bob Smith 20 min Finish Cure epoxy.
That’s when you have to put some Araldite epoxy in a small plastic cup, and hardener in another small plastic cup, and give them a little time in the microwave (like 10 seconds, not more)
Result - a thinner and quicker setting epoxy.
If you microwave it after mixing, it’ll become a lump before you can use it.
Hope this helps...
Regards
Edit
Rai saheb,
Hope you don’t mind this slight diversion from the main topic...
Regards
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February 10, 2019, 04:24:51 AM »
sanjayrai55
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Re: Curare 20
Not at all Iyer sir. Gyan is always good
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February 10, 2019, 10:32:16 PM »
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Re: Curare 20
Thank you Sir for this insight. Never tried this before. Will try this method on next build
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February 14, 2019, 08:45:55 AM »
sanjayrai55
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Re: Curare 20
Fuse
Curare 20
Curare 20
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February 14, 2019, 08:46:35 AM »
sanjayrai55
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Re: Curare 20
Stab
Curare 20
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February 14, 2019, 11:35:24 AM »
sanjayrai55
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Re: Curare 20
Stab done
Curare 20
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February 14, 2019, 12:34:04 PM »
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Re: Curare 20
Rai sir another good build from you i always like balsa and play construction
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February 14, 2019, 12:45:25 PM »
sanjayrai55
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Re: Curare 20
Thanks Gaurang
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Reply #40 on:
February 17, 2019, 07:05:22 PM »
sanjayrai55
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Re: Curare 20
Some progress: the tail
Curare 20
Curare 20
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Sanjay - Gravity is my enemy
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Reply #41 on:
February 17, 2019, 07:08:33 PM »
sanjayrai55
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Re: Curare 20
Landing Gear installed
Wing mounting arrangement done. Could not use the original because the fuel tank fouls. In fact, because of the tank, I had to change the engine mounting from wooden bearers to a GFN mount, and this had a cascading effect in changes really extending this build
Curare 20
Curare 20
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Sanjay - Gravity is my enemy
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Reply #42 on:
February 17, 2019, 07:20:49 PM »
sanjayrai55
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Re: Curare 20
The original tank is 190 cc, oval, with the larger axis horizontal
Curare 20
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Reply #43 on:
February 17, 2019, 09:27:25 PM »
K K Iyer
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Re: Curare 20
@sanjayrai55
Sir, I rememberreading somewhere in Hanno Prettner’s writing that even that thick fin leading edge has an experimentally found aerodynamic reason, like in the case of the anhedral stab...
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February 18, 2019, 10:07:04 AM »
sanjayrai55
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Re: Curare 20
Quote from: K K Iyer on February 17, 2019, 09:27:25 PM
@sanjayrai55
Sir, I rememberreading somewhere in Hanno Prettner’s writing that even that thick fin leading edge has an experimentally found aerodynamic reason, like in the case of the anhedral stab...
No idea really. Just a very complicated build
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Sanjay - Gravity is my enemy
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Reply #45 on:
February 20, 2019, 04:43:23 AM »
sanjayrai55
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Re: Curare 20
Fitted in the Servos and pushrods
Curare 20
Curare 20
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Sanjay - Gravity is my enemy
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Reply #46 on:
February 20, 2019, 04:45:16 AM »
sanjayrai55
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Re: Curare 20
There are twin elevators, so 2 pushrods into one servo. Bound with copper wire and soldered
Curare 20
Curare 20
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Sanjay - Gravity is my enemy
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Reply #47 on:
February 21, 2019, 07:36:42 AM »
sanjayrai55
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Re: Curare 20
Made the wing fillets
Curare 20
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Reply #48 on:
February 21, 2019, 07:38:47 AM »
sanjayrai55
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Re: Curare 20
Test fit of the control surfaces
Curare 20
Curare 20
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Reply #49 on:
February 21, 2019, 06:09:03 PM »
sanjayrai55
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Re: Curare 20
Turtle Deck fitted
Curare 20
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Reply #50 on:
February 21, 2019, 06:55:41 PM »
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Re: Curare 20
Sir your craftsmanship is extraordinary.
. I think you have a full fledged workshop around.
Regards!!!
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Reply #51 on:
February 21, 2019, 06:57:48 PM »
sanjayrai55
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Re: Curare 20
Quote from: unidrakeshrc on February 21, 2019, 06:55:41 PM
Sir your craftsmanship is extraordinary.
. I think you have a full fledged workshop around.
Regards!!!
Thank you, You are kind, I'm not that good
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Sanjay - Gravity is my enemy
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Reply #52 on:
July 28, 2019, 05:13:31 AM »
sanjayrai55
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Re: Curare 20
No, the project was not abandoned! My house is being redeveloped, so I have temporarily shifted to a rented accommodation. What with the vicissitudes of shifting, and lots of other work, I had to temporarily put the build on hold, but have now restarted
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Sanjay - Gravity is my enemy
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Reply #53 on:
July 28, 2019, 05:48:49 AM »
sanjayrai55
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Re: Curare 20
New workshop till about 2020 Diwali
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Sanjay - Gravity is my enemy
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Reply #54 on:
July 28, 2019, 05:59:09 AM »
sanjayrai55
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Re: Curare 20
Started covering
Curare 20
Curare 20
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Sanjay - Gravity is my enemy
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Reply #55 on:
July 28, 2019, 05:59:52 AM »
sanjayrai55
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Re: Curare 20
Complicated covering - too many compound curves
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Sanjay - Gravity is my enemy
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Reply #56 on:
July 28, 2019, 06:08:33 AM »
sanjayrai55
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Re: Curare 20
Curare 20
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Reply #57 on:
July 28, 2019, 01:40:35 PM »
sanjayrai55
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Re: Curare 20
Curare 20
Curare 20
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Reply #58 on:
July 28, 2019, 01:41:09 PM »
sanjayrai55
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Re: Curare 20
Curare 20
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Reply #59 on:
July 31, 2019, 09:41:17 AM »
sanjayrai55
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Re: Curare 20
Started on the wing
Curare 20
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Sanjay - Gravity is my enemy
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Reply #60 on:
August 01, 2019, 08:29:17 PM »
sanjayrai55
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Re: Curare 20
Airframe nearing completion
Curare 20
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Sanjay - Gravity is my enemy
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Reply #61 on:
August 01, 2019, 08:30:06 PM »
sanjayrai55
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Re: Curare 20
.
Curare 20
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Sanjay - Gravity is my enemy
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Reply #62 on:
August 02, 2019, 10:04:50 AM »
manu
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Re: Curare 20
wonderful sir.
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even crashing requires a flight......
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Reply #63 on:
August 02, 2019, 10:52:31 AM »
sanjayrai55
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Re: Curare 20
Thanks Manu
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Sanjay - Gravity is my enemy
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Reply #64 on:
August 03, 2019, 10:08:45 PM »
prabal276
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Re: Curare 20
It's a hottie sir!
😋😋😋
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Reply #65 on:
August 04, 2019, 04:35:49 PM »
sanjayrai55
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Re: Curare 20
Thanks Prabal
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Sanjay - Gravity is my enemy
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Reply #66 on:
August 06, 2019, 11:10:51 AM »
sanjayrai55
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Re: Curare 20
Construction complete
Curare 20
Curare 20
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Reply #67 on:
August 06, 2019, 04:05:51 PM »
sanjayrai55
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Re: Curare 20
Some details
Curare 20
Curare 20
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Sanjay - Gravity is my enemy
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Reply #68 on:
August 06, 2019, 04:09:20 PM »
sanjayrai55
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Re: Curare 20
Curare 20
Curare 20
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Sanjay - Gravity is my enemy
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Reply #69 on:
August 06, 2019, 04:14:38 PM »
sanjayrai55
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Re: Curare 20
Curare 20
Curare 20
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Sanjay - Gravity is my enemy
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Reply #70 on:
August 06, 2019, 04:18:36 PM »
sanjayrai55
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Re: Curare 20
Curare 20
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Sanjay - Gravity is my enemy
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Reply #71 on:
August 07, 2019, 01:31:07 PM »
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Re: Curare 20
Superb build ! Excellent finish....
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Reply #72 on:
August 07, 2019, 04:31:10 PM »
sanjayrai55
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Re: Curare 20
Quote from: Aeroresurrect on August 07, 2019, 01:31:07 PM
Superb build ! Excellent finish....
Thanks
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Sanjay - Gravity is my enemy
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Reply #73 on:
August 07, 2019, 06:14:42 PM »
manojswizera
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Re: Curare 20
Sanjay sir, the final product looks superb
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Russ-40 Trainer, Mr.moss, Pushler, Skysurfer, Mugi , F-22, Red swan, Xtra-300, redfury, flying mantaray.
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Reply #74 on:
August 07, 2019, 06:31:06 PM »
sanjayrai55
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Re: Curare 20
Thanks Manoj! Hope she flies well
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Sanjay - Gravity is my enemy
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Reply #75 on:
August 08, 2019, 05:47:01 AM »
R C
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Re: Curare 20
Sir,
Awesome build and very neat covering.
Colour scheme makes it look like an ARF
She will definitely fly well Sir.
All the best for the Maiden flight Sir.
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--o-o-Ộ-o-o-- --o-o-Ộ-o-o-- --o-o-Ộ-o-o--
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Reply #76 on:
August 08, 2019, 06:03:01 AM »
sanjayrai55
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Re: Curare 20
Thanks R C
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Sanjay - Gravity is my enemy
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Reply #77 on:
August 08, 2019, 10:25:23 AM »
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Re: Curare 20
Awesome build Sanjayji. As always it is perfect build.
Awaiting the maiden video.
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Reply #78 on:
August 08, 2019, 11:19:26 AM »
sanjayrai55
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Re: Curare 20
Quote from: Rooster on August 08, 2019, 10:25:23 AM
Awesome build Sanjayji. As always it is perfect build.
Awaiting the maiden video.
Thank so much
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