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Title: Went inverted on launch. Help. Post by: Ashish848 on March 09, 2019, 10:53:27 PM 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😥 Title: Re: Went inverted on launch. Help. Post by: prabal276 on March 10, 2019, 08:17:36 AM 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 Title: Re: Went inverted on launch. Help. Post by: K K Iyer on March 10, 2019, 09:43:59 PM 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 “I don’t feel well”, and expecting him to diagnose! It’s 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. You’ll soon taste success! Regards Title: Re: Went inverted on launch. Help. Post by: pnkyjs on March 11, 2019, 10:49:46 AM 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
Title: Re: Went inverted on launch. Help. Post by: Ashish848 on March 13, 2019, 05:29:59 AM 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 Title: Re: Went inverted on launch. Help. Post by: K K Iyer on March 13, 2019, 02:58:44 PM Wings flat! Forgot the polyhedral angle of the wingtips? ???
Hence lack of inherent roll stability. Also probably tail heavy and/or too much up elevator input. Hope the tall grass prevented damage. Title: Re: Went inverted on launch. Help. Post by: K K Iyer on March 14, 2019, 08:50:55 PM @ashish848,
I’ve moved your post and replies to a separate thread with a more appropriate heading... Title: Re: Went inverted on launch. Help. Post by: K K Iyer on March 15, 2019, 09:31:08 PM @Ashish848,
Guess you’re either too busy, or not really interested. Discourages attempts to help! Best of luck anyway... Title: Re: Went inverted on launch. Help. Post by: prafulla on March 16, 2019, 12:18:24 PM u don't know how to fly learn first using simulator .
Title: Re: Went inverted on launch. Help. Post by: hangingtough on April 20, 2019, 01:50:47 PM it seems you are on 3S and very large prop.
Try to either use small prop or go to 2S. There is a lot of tall grass, try to throw and trim. because you plan climbed too much and went to right, It should fly straight. |