RC India
Welcome Guest, please login or register.
 
Pages: [1]   Go Down
0 Members and 1 Guest are viewing this topic. Topic Tools Topic Tools 
Read
« on: July 22, 2009, 03:58:59 PM »
anwar
Administrator
Forum Hero

*****

Reputation Power: 141 
anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!
Offline Offline

City: Doha (Qatar) & Thrissur
State: Kerala
RC Skills: Advanced
Posts: 11619
Join Date: Mar, 2009

RC India - Flying and racing with open minds !




So you have just had the worst luck, and the model is lying in pieces.  What do you look for in trying to figure out what went wrong ? 

How is the investigation different for electric versus nitro ?

BTW, there is no point in investigating when you know YOU caused the crash (by getting disoriented etc).  What we are looking for is the case when you THINK it is NOT your fault (yeah right !  how many times have we heard that one before !??!?!)
« Last Edit: July 22, 2009, 05:37:16 PM by anwar » Logged

Hangar : Please see my introduction.
RC India forum and me : About this forum.
 

Read
« Reply #1 on: July 22, 2009, 05:45:27 PM »
anwar
Administrator
Forum Hero

*****

Reputation Power: 141 
anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!
Offline Offline

City: Doha (Qatar) & Thrissur
State: Kerala
RC Skills: Advanced
Posts: 11619
Join Date: Mar, 2009

RC India - Flying and racing with open minds !



Step 1 :

I guess we should start with the split second when you sense something is wrong (which is even before the model has crashed).

The first thing is safety, trying to guage the amount of control, and directing the aircraft away from people and property (like cars).  If you are too close to the ground already, try to cut throttle (or hit "throttle hold", if you are flying a heli).  A spinning prop hitting the ground is much worse than an "unpowered" one doing it.

You have to verify what controls are still active, before crashing if possible.  The crash itself may cause additional parts failures, so having an understanding of what was working and what is not working greatly helps.  But we all know that this kind of "quick investigation" may not be possible in those critical moments, as we are already beginning to panic.
Logged

Hangar : Please see my introduction.
RC India forum and me : About this forum.
 

Read
« Reply #2 on: July 23, 2009, 05:55:32 PM »
anwar
Administrator
Forum Hero

*****

Reputation Power: 141 
anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!
Offline Offline

City: Doha (Qatar) & Thrissur
State: Kerala
RC Skills: Advanced
Posts: 11619
Join Date: Mar, 2009

RC India - Flying and racing with open minds !



Pitch in folks ! What should you look for after the model is lying in front of you in pieces ?
Logged

Hangar : Please see my introduction.
RC India forum and me : About this forum.
 

Read
« Reply #3 on: July 23, 2009, 06:10:33 PM »
rcforall
Plane Lover
Forum Hero

*****

Reputation Power: 22 
rcforall barely matters.rcforall barely matters.
Offline Offline

City: Chennai
State: Tamil Nadu
RC Skills: Beginner
Posts: 1663
Join Date: Mar, 2009



The Money that just went pooof  Grin Cheesy helping to reach 5 K
Logged

www.zuppa.io : vehicle telematics, ADAS, IoT , Drones
 

Read
« Reply #4 on: July 23, 2009, 06:17:34 PM »
tg
Plane Lover
Forum Hero
*****

Reputation Power: 1 
tg has no influence.
Offline Offline

City: Bangalore
State: Karnataka
RC Skills: Beginner
Posts: 553
Join Date: Oct, 2009



Pitch in folks ! What should you look for after the model is lying in front of you in pieces ?

Glue would be a good thing if not too many pieces or a bag if too many pieces. Grin
Logged
 

Read
« Reply #5 on: July 23, 2009, 06:20:43 PM »
rcforall
Plane Lover
Forum Hero

*****

Reputation Power: 22 
rcforall barely matters.rcforall barely matters.
Offline Offline

City: Chennai
State: Tamil Nadu
RC Skills: Beginner
Posts: 1663
Join Date: Mar, 2009



Getting serious ok :

In majority of the case it is normally pilot error .

The other major contributor to this is the lack or interference in communication between the receiver and transmitter ,

If it is a control system failure I would basically look  at the linkage connections , have had incidents of  connectors coming off in air  if they  are fine then the next step is possible  loose connection at the receiver end of the servos .
If all that is fine  and there has been  a control surface malfunction  the I would investigate the BEC/ESC.

Checking the LIPO battery voltage will also be a practice to rule out battery failure.

Sai

Logged

www.zuppa.io : vehicle telematics, ADAS, IoT , Drones
 

Read
« Reply #6 on: July 23, 2009, 06:29:11 PM »
rcforall
Plane Lover
Forum Hero

*****

Reputation Power: 22 
rcforall barely matters.rcforall barely matters.
Offline Offline

City: Chennai
State: Tamil Nadu
RC Skills: Beginner
Posts: 1663
Join Date: Mar, 2009



Pitch in folks ! What should you look for after the model is lying in front of you in pieces ?

As TG says a bag is the first thing to look for  Wink Grin Grin
Logged

www.zuppa.io : vehicle telematics, ADAS, IoT , Drones
 

Read
« Reply #7 on: July 23, 2009, 06:54:12 PM »
anwar
Administrator
Forum Hero

*****

Reputation Power: 141 
anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!
Offline Offline

City: Doha (Qatar) & Thrissur
State: Kerala
RC Skills: Advanced
Posts: 11619
Join Date: Mar, 2009

RC India - Flying and racing with open minds !




Hate people with an "inverted" sense of humor Grin  Will not talk to you guys for many months  Lips Sealed  Lips Sealed  Unless of course, you say anything bad about Futaba, in which case I will speak again with lots of vengeance  Angry  Angry

Back to the list mode (I love putting things in lists, easy to refer to later on, and also for adding new stuff), and summarizing Sai's post :

1. Check if there is still movement in all the control surfaces.  This also validates if your radio link is still active.  Of course, assuming the main items are still connected to each other (receiver battery, receiver, ESC in the case of electrics etc).

2. Check which of the controls is not responding.  If any one is not responding, check if there was a loose connection.  Check for broken or "popped-out" servo arms, broken linkage rods etc.

3. Check if any electronic device is abnormally hot/melted etc.

4. If there are light indicators, note their statuses.

5. If you have a voltmeter, check voltages of the batteries involved.

6. Check if you were flying the right model, and if you had your antenna extended etc (for non 2.4).

7. For non-2.4, check if anyone just turned on their radio, or was setting up a new model (for synthesized sets).

8. Check if you had any control surfaces reversed (should have caught this in preflight checking).

Logged

Hangar : Please see my introduction.
RC India forum and me : About this forum.
 

Read
« Reply #8 on: July 24, 2009, 08:37:34 AM »
mpsaju
Plane Lover
Senior Member

***

Reputation Power: 2 
mpsaju has no influence.
Offline Offline

City: Chennai
State: Tamil Nadu
RC Skills: Intermediate
Posts: 114
Join Date: Mar, 2009



How about:
a. Smell... tell tale sign of your motor winding/esc cooked
b. Lipo having taken a serious hit and some of the innards spilt... Alternately, the lipo could also be heating up on the verge of instability... not the time to be around !! Lithium catches fire when exposed directly to atmosphere!!
c. Motor mount... Nose hits with motor mounted on the nose ... watch out for breakage/weakening of the motor mount, shaft of the motor, circlip of the motor shaft, collar on the motor shaft, sand in between the rotor and the stator, loose magnet, loose motor mount fasteners. In case of clamped on motor mount, change of position or loss of downthrust and side thrust, loss of continuity of the windings, soldering broken etc.
d. Prop... if not broken, check for proper tracking. Improper tracking (both blades move in different paths) indicates a crack in the process... dangerous to use such a prop... could break in the middle of rotation at high speed and penetrate anything in its path like a missle.
e. Under-carriage... A tipping over tendency indicates that the under carriage is bent beyond the cg position
Logged

Happy Flying


Saju
 

Read
« Reply #9 on: February 18, 2011, 08:57:54 AM »
Ajay JM
Heli Lover
Senior Member
***

Reputation Power: 2 
Ajay JM has no influence.
Offline Offline

City: Plano, US; Pala, Kottayam
State: Kerala
RC Skills: Intermediate
Posts: 149
Join Date: Dec, 2010



My half cent..this helps salvage parts but may not help find the cause of crash.

Don't pick or move your heli from the location where it kissed the ground before you analyse all damages.

It's a natural tendency to pick up the heli, 'cos you are already heart broken.

There could be parts lying nearby which you could salvage.

When I had my belt CP crash last(pilot error) on green grass, I didn't observe a lost linkage push rod, though I identified all other broken parts. It should've been a popped off link that lay somewhere near on the grass. I realised the linkage is missing only when I reached home. I had stored all spares except the linkages(I thought I had but I didn't).

Wish I had taken some patience and inspected thoroughly before leaving the crash site.
Logged

Awaiting the next tornado to fly my kites..
 

Read
« Reply #10 on: February 19, 2011, 01:56:17 PM »
AEROVISHWA
Its Your LIFE... Make it LARGE.....
Plane Lover
Forum Hero

*****

Reputation Power: 16 
AEROVISHWA has no influence.
Offline Offline

City: belgaum
State: Karnataka
RC Skills: Intermediate
Posts: 1320
Join Date: Feb, 2011

IN THRUST WE TRUST.....!!



don't check the link (push-rod to horn on control surface) they often come out on impact.......

they will lead you on a wrong path..... Bang Head
Logged

Aerodynamics are for people who can't build engines.
-Enzo Ferrari

https://sites.google.com/site/vishveshkakkeri93/
HAPPY LANDINGS
 

Read
« Reply #11 on: June 30, 2011, 01:33:01 AM »
anwar
Administrator
Forum Hero

*****

Reputation Power: 141 
anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!
Offline Offline

City: Doha (Qatar) & Thrissur
State: Kerala
RC Skills: Advanced
Posts: 11619
Join Date: Mar, 2009

RC India - Flying and racing with open minds !



What happened here ? Head Scratching

Logged

Hangar : Please see my introduction.
RC India forum and me : About this forum.
 

Read
« Reply #12 on: June 30, 2011, 04:15:51 AM »
globalmilind
Milind
Plane Lover
Senior Member

***

Reputation Power: 2 
globalmilind has no influence.
Offline Offline

State: Uttar Pradesh
RC Skills: Expert
Posts: 182
Join Date: Mar, 2011

Indian Revolution - 100% Pure 100% Hygienic



"Wooaahh.... Unbelievable crash.. Unbelievable crash.."
Probably some 'invisible' wall!!  Grin
Logged

Milind Raj

India, I pledge to serve you, to protect you and make you shine above all.....
....and when all the wars are over, a butterfly will still be beautiful.
 

Read
« Reply #13 on: June 30, 2011, 08:43:44 AM »
warriornair
Plane Lover
Forum Veteran

****

Reputation Power: 4 
warriornair has no influence.
Offline Offline

City: Alappuzha
State: Kerala
RC Skills: Beginner
Posts: 271
Join Date: Feb, 2011



in my case, i would only look wether any parts can be reused............
Logged
 

Read
« Reply #14 on: June 30, 2011, 08:56:42 AM »
flatspin_king
Plane Lover
Senior Member

***

Reputation Power: 3 
flatspin_king has no influence.
Offline Offline

City: New Delhi
State: Delhi
RC Skills: Intermediate
Posts: 175
Join Date: Feb, 2010



wow, in the video the plane comes apart just from the aerodynamic stresses on the airframe - as the pilot pulls up too fast from a very high speed low pass. As gm said it sure lookes like it hit an invisible wall!
 reversed control surfaces, especially ailerons, is a common mistake.
Also in gassers vibration can easily  loosen bolts etc that are not locktited. 

Logged
 

Pages: [1]   Go Up
Jump to:  

Related Topics
Subject Started by Replies Views Last post
Cheetah chopper crash
Chatter Zone
vezoto 0 1855 Last post February 03, 2015, 09:26:19 PM
by vezoto
very lucky FPV quadcopter. CRASH ...
Chatter Zone
MKARTIKGANDHI 12 5673 Last post August 15, 2015, 11:56:27 PM
by meet2ami
Firebird Jet Crash
Gas/Glow/Nitro Planes
DominicM 0 2818 Last post February 24, 2017, 09:08:34 PM
by DominicM
JU-88 crash
Electric Planes
DominicM 0 2037 Last post April 12, 2017, 02:46:56 PM
by DominicM
Cause of crash? Flying through an big explosion fireball!
Gas/Glow/Nitro Planes
DominicM 0 1276 Last post September 10, 2017, 05:53:58 PM
by DominicM