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« on: March 09, 2019, 10:53:27 PM »
Ashish848
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My scratch build rc plane after taking off went inverted and crashed what would be the problem???
Is it tail heavy??
And i had checked the CG,it was all right
Anybody help please😥
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« Reply #1 on: March 10, 2019, 08:17:36 AM »
prabal276
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Many possibilities.....
Could be a thrust angle problem, Could be an Elevator design problem, the elevator could be uptrimmed or the linkage may have been loose, or it also could be a wing incidence issue.
Pictures will be helpful. A video will help even more in narrowing down to the root of the problem.
Regards
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« Reply #2 on: March 10, 2019, 09:43:59 PM »
K K Iyer
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My scratch build rc plane after taking off went inverted and crashed what would be the problem???
Is it tail heavy??
And i had checked the CG,it was all right
Anybody help please😥

This is like telling a doctor ďI donít feel wellĒ, and expecting him to diagnose!
Itís possible, but
You need to explain the symptoms.
1.Did it roll right into inverted?
2. Did it roll left into inverted?
3. Did it loop into inverted?
4. Did it bunt into inverted?

We also need to know details of the model
1. Is it a tractor, pusher, motor at nose or above wing etc
2. Wing span, wing loading etc
3. Details of motor, prop etc

Common reasons for going inverted and crashing on takeoff are
1. Tail heavy
2. Applying too much up elevator
3. Tip stall

Assuming the design was ok and the pilot was competent!

Pl post a video if possible.
Else at least post pics of the model, and details of size and electronics.

An initial failure is not the end of the world.
Youíll soon taste success!
Regards

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« Reply #3 on: March 11, 2019, 10:49:46 AM »
pnkyjs
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When i fly my heli, i need to add some initial aileron at take off. Similarly, i suppose you need to counter the rolling moment during take off. And up elevator only after getting some speed. Just my 2 cents. Having flaps also helps . And my scratch built also need some aileron/rudder and elevator inputs during launch
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« Reply #4 on: March 13, 2019, 05:29:59 AM »
Ashish848
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Its wingspan is 1500mm
Chord length is 170mm
It has 1000kv motor with 10◊4.5 inch prop
Weight is about 700 grams

I'm attaching a link with full description to the kit

http://www.vortex-rc.com/product/vt-allrounder-v4/

Link to  crash video

https://drive.google.com/file/d/1-1ZkGicCYJ0MbI3UoZXT46kI_oBsTXHJ/view?usp=drivesdk
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« Reply #5 on: March 13, 2019, 02:58:44 PM »
K K Iyer
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Wings flat! Forgot the polyhedral angle of the wingtips?  Huh?
Hence lack of inherent roll stability.
Also probably tail heavy and/or too much up elevator input.
Hope the tall grass prevented damage.
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« Reply #6 on: March 14, 2019, 08:50:55 PM »
K K Iyer
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@ashish848,
Iíve moved your post and replies to a separate thread with a more appropriate heading...
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« Reply #7 on: March 15, 2019, 09:31:08 PM »
K K Iyer
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@Ashish848,
Guess youíre either too busy, or not really interested.
Discourages attempts to help!
Best of luck anyway...
 
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« Reply #8 on: March 16, 2019, 12:18:24 PM »
prafulla
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u don't know how to fly learn first using simulator  .
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