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Old Mar 19, 2013, 09:47 PM
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United States, CO, Parker
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Help!
plane crash cause

Just wondering what could of caused this crash and why the plane was out of controll winds wer calm. thank you

Rc Plane crash (1 min 6 sec)
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Old Mar 19, 2013, 09:51 PM
Carthage, TX
United States, TX, Tenaha
Joined Mar 2012
556 Posts
The link didn't work for me???
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Old Mar 19, 2013, 09:53 PM
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If link doesnt work im mrcoloradorcflyer on youtube. Rc plane crash video
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Old Mar 19, 2013, 10:03 PM
Carthage, TX
United States, TX, Tenaha
Joined Mar 2012
556 Posts
Well for some reason the link works now. Loose motor mounts would cause a problem. It is hard to see in the view mounted on the plane. Maybe you didn't have enough air speed for the control surfaces to recover from a stall. It looks like you took off with about 2 feet of runway. What is the plane and power system?
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Old Mar 19, 2013, 10:11 PM
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Its a hobbytown gamma 370 I have had no problem with this plane before. I have had the cam mounted and got to about 2-300 feet no problem. It has a 370 bell brushless 1250kv and Im running a 3s 1300mah lipo. Like I said there has never been a problem like this. I usally take off pretty fast it doesnt need much. Im thinking the Taxi nose dive my have loosend the motor mount. But can just a little loose cause this much out oc controll. Its a 3 channel and you can see how it fliped upsidedown at the end.
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Old Mar 19, 2013, 10:19 PM
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Looks tail heavy, the way it goes nose up right after takeoff and then maneuvers wildly in all directions. Any chance the battery was loose after the noseovers, and moved aft during the high-angle climb after takeoff?

Or, the pull-up to a high angle right after takeoff may just have caused the airspeed to be too low & the plane was stalling, as Colbyntx says.
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Old Mar 19, 2013, 10:19 PM
In thrust we trust
phoam's Avatar
Aguanga, Ca
Joined Mar 2010
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Did you recently re-bind the plane, and forget to remove the bind plug?

I had an episode with a plane of mine that played out just like yours - nosed down into the ground accelaerating on take off a couple times which was really unusual, then when I finally got it to take to the air I had no control of the plane which ended with a wicked lawn dart.

Then I realized I'd left the bind plug in the receiver.

Now that I think back on it, I perceive that the noseovers on takeoff were hints the ESC was throwing at me as if to say "Hey, there's a bind plug stuck in me!" A noteworthy forewarning I reckon, if you know to recognize it.
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Old Mar 19, 2013, 10:28 PM
rrg
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Did you look at the motor mount??
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Old Mar 19, 2013, 10:30 PM
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Tail heavy is what i would think but its not at all cg it good a tad nose heavy. I did pull back on the elivator pretty good though. But why would I not be able to controll it even if I pulled back to hard. lots of power cant think that it was stalling, plenty of thrust. Lipo has no room to move.
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Old Mar 19, 2013, 10:32 PM
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Quote:
Originally Posted by rrg View Post
Did you look at the motor mount??
yeah its just mounted on the firewall from balsa wood and the bell mount was off but i think from the crash.
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Old Mar 20, 2013, 01:00 AM
Y=C+I+G
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United States, CA, Rosemead
Joined Jan 2012
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when i had a cub i had changed the motor several times and done other minor mods. at one point it had seemed that cg was right when measured on the ground but it would behave tail heavy. i added more nose weight and then it behaved.
i have also flown with a slightly loose motor mount and it flew. i would be surprised if its the motor mount causing that behavior.
i agree with the prior posters that it seems that it may be tail heavy (tom1968) but it also seems like you didn't have enough airspeed (Colbyntx). did you change your prop or using the same one? i once put on a wrong prop on my spit and it did something like what your plane shows - fighting a stall.
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Old Mar 20, 2013, 01:13 AM
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Its a 8x6 slow flyer. I have flown this plane a number of times with same setup cant be tail heavy or I would have had this issue a long time ago. Ill try to put some weight up front and see what it does. Thanks for the help guys!!
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Old Mar 20, 2013, 01:58 AM
Grumpy old git.. Who me?
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Aberdeen
Joined Mar 2006
11,980 Posts
From the vid it looked like you pulled it off the ground too soon without adequate airspeed. the plane then stalls, drops a wing, you over compensate and probably apply up elevator, it stalls and snaps the other way and this continues getting worse each time until it crashes. I didn't see anything suggesting it to be tail heavy, nor is it likely to be if the model has flown before and nothing has changed. A loose motor mount wouldnt explain it.

So in a nut shell... Pilot error; you took off too soon without letting the plane build up enough speed. Then when you were in the air you probably held in up elevator meaning the plane kept on stalling and snapping one way, then the other.

How long have you been flying?
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Old Mar 20, 2013, 02:16 AM
I think I forgot how to fly RC
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United States, WA, Woodinville
Joined Mar 2007
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looks like a classic example of over control by the pilot.

Pulling back hard on the elevator is just going to lead to a nasty stall condition, to which the pilot then panics a bit and starts yanking on the sticks even harder, exacerbating the issue further.

Next time this happens to you, first of all, try to get some altitude smoothly first, then practice your stall recoveries. Meaning, go very easy on the sticks when you feel she is going out of control somewhat.
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Old Mar 20, 2013, 05:07 AM
Low'n Slow is safest, right?
KaiWE's Avatar
Norge, Østfold, Fredrikstad
Joined Jun 2011
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Quote:
Originally Posted by cessna20122013 View Post
... But why would I not be able to controll it even if I pulled back to hard. lots of power cant think that it was stalling, plenty of thrust. ...
Because it's not all about thrust - lift from the wings is a major part in the equation of flying


I agree with cryhavoc and JetPlaneFlyer on what caused this...
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