experimental RC airplane crash at SCCMAS

[calmatosport]

I'm studying Aeronautical engeneering and am a frequent rc pilot. The mistake that they probably made was the CG way to far back. With the big ones it's better for the wing loading and more efficient, but it makes smaller planes very unstable and thus ,like the F16, some can't even fly without stabilisation systems onboard. This was probably pilot error caused by the design that was not dynamicly stable.

[nibbler125]

too much throw on the elevator. even an experienced flyer would have trouble flying it.

[lisarenee3505]

We see this kind of thing frequently out at the flying field at the University of Oklahoma. The aeronautic engineering kids will come out there with some project they've been designing and building all semester, only to have them crash within seconds of taking off or being launched. The last time it didn't even take that long, the thing fell out of the air as soon as it was hand-launched. I guess you gotta let the kids fail so they will have mistakes to learn from though.

[MrJoggl]

It was the EXPO you should put it a bit negative!!

[718skaterboy]

nose heavy much?

[ussgrisham]

As a grad of the SJSU Aviation Department I know that this was not ours it had to come from the Engineers over on the main campus in that bath tile building.

[dont12die]

Looks to me that the CG was not ok, looks like it was nose heavy.

[wristp1n]

@dont12die hell yeah it was nose heavy! did you see the rear wheels come off the ground first? lol! ugly too

[shagmasterson]

hopefully they don't design real planes there otherwise I am never flying again :P

[nolsmtm]

it amazes me that universities and such go to all that effort to build a plane for a project and then let an incompetent pilot maiden it.

[wcolby]

@nolsmtm

People that fly foam, shouldn't throw stones.

[Imprezaman555]

@wcolby Why does it matter what the plane is made of?

[jungibaaz]

@wcolby people who fly wood shouldnt talk either ;)

[GrigoriZhukov]

@nolsmtm What makes you so expert? The test pilot for the F22 crased it on the FIRST flight due to PIP and he is an expert. IOW he can fly and you just walk...

[DHubert777]

@nolsmtm It was more likely a design error. The stability and control calcs probably are to blame

[7777dmith7777]

A plane with the engine mounted at such a high center of gravity should have small aieleron surface and it has to be set with like 80% up and 20% down, the motor is constantly trying to push the nose down......It is a bad idea...

[1Masterofwar]

Thats not a crash... Thats a rough landing on botched take off... A crash is when you have to get a bucket to bring your plane home in... ;-D

[agentzanzibar]

if anhything the plane was tail heavy, tail hevay planes are unstable and have over responsive elevators. could have also been and inexperienced pilot and very large elevator throws.

[LightningFlyer]

Has too much down thrust... and nose heavy

[k9daniel2rv]

it was the planes CG( center of gravty) it was to far forward.

[toakreon]

That looked to me like a classic lack of static, longitudinal stability. Not enough stability margin - CG not far enough in front of the neutral point. Yes, the pilot might have over-corrected, adding to the problems, but the model looked far too pitch sensitive anyway ... and that's a CG problem.

[ANIKES]

it looks to me having a negative dihedral....

it this the experimental concept about ??

[PLISKEN12]

didnt check th cg

[vansenair]

I`m finish an Osprey 2 amphibian engine pusher, and is very dificult set the balance, cg in static, cg full trottle, set the stab + 2 degrees, the exactly length between main spar of wing and main spar of stab wing. i think will need good lucky. Hey !! you try again fly it ??.

[transdrole]

Notice that even before it takes off, the motor is pitching the nose down as they add throttle.  You can see the gear flexing.

[Sharma17]

Ok, i'm no expert. But at a guess I would have thought they would have measured the C.G, had it all balanced, and this might have instead resulted because of the effects of Torque wanting to PUSH the plane forward. Could just be a simple C.G problem,, who knows.

[jaksel]

They should've checked the center of gravity on that thing first.

[Nowak98765]

cpunge001 is reatrded man u needs to change your trim on ur remote if still nothin then change the serve length on the plane where you attach it to the elevaot that part

[AllenRockwell]

@Nowak98765 you are hilarious.

You call cpunge001 retarded

.... and then you use terms like "serve length", "elevaot" "nothin", "ur", "u", "u needs"...

What is a "serve length" and how do you change it? What is an "elevaot that part"?

You might want to run a spell checker on your posts before calling someone else retarded. Or, even better, just stop calling people retarded.

[cpunge001]

1 noise heavy

2 it may should work if you had take off flaps but i dont know

[skinnywhop87]

lol what on earth would make you think that thing was aerodynamic? Waaaaaaay too much weight and no where near the balance in the front make that thing even worth try........ Next time you should modify the body of that airplane and manage a way to mold that motor into the body, but still it's quite big so that's a project all its own

[TWOLF365]

How do you know it weighs too much? Did you pick it up? And lack of aerodynamics? I have flown a lawnmower and it is less aerodynamic than this thing! How about you modify what you are talking about so you don't sound so dumb!

[toakreon]

Classic over-responsiveness to elevator control. CG too far back resulting in too little static longitudinal stability. Shift the CG forward, possibly with a compensatory touch of up trim.

[NVanWendy]

Since it was made by university students and called "experimental," I wonder if it was supposed to be autonomous. If so, your comment would still apply, and they'd need to put some sort of delay or damper on the elevator control. Probably even trickier than learning how fly regular RC!

[platterhof]

LOL. Perhaps you need to add some flaps, to gain wingspan?. It's like starting a 747 wihout flaps and backwind at same time..

[platterhof]

LOL

[7pcamat]

I wouldn't agree that it's either nose or tail heavy, but the arm (or distance between the TE of the wing and LE on the horizontal stab) were too close together resulting extreme pitching. Meaning harder to control.

[cholubaz]

5* for the effort. Im sure he can get it sorted out and make it fly stable with some more tweaking.

Check out some of my videos and see what were flying over at my filed. I upload new videos of RC planes all the time

[jonobrad100]

listin to dat guys laugh at 0:17 , i think its a dude

[flyboy101100]

it was nose heavy

[BatoLoco97]

funny vid that once happened to me in a simulator in my house

[BreezyHawk]

It was that darned high thrust line me thinks. Happens to people even in flight sims.

[ssgtakeo]

Yeah they have the thrust line set wrong.

[airforce6001]

Being noise heavy what caused the crash.

[cosminx2003]

It is probably too heavy on the tail or nose

[randommagnum]

Pilot error.

[joaodguimaraes]

I'm 100% sure the problem was it being tail heavy... or nose heavy... I think. lol

[pysc1984]

nope, totally pilot error. it took off and "flew" with no problems until pilot pulled on the stick causing it to learch up, pilot was startled and went into up / down.. pilot should have let it get more altitude before he pulled on the stick so he could see how much of a difference it made, and adjusted "trim" as needed

[deathcomesarippin]

@pysc1984

seems like the engine being up top didnt really help either lol

[2042nicky]

@pysc1984 Just because the accident was pilot era doesn't mean the plane didn't suck at flying...

[popcornreviews]

@pysc1984 Yep, that is totaly true, He looked like he had to much throw on the elevator or the plane was to tail heavy

[trondyne]

@joaodguimaraes

Looks tail heavy...

[lin350gg]

@joaodguimaraes NOPE HEAVY MOST LIKELY

[waverly24]

Even without adding or finishing the cockpit it still flies like a front-heavy bitch...

[GreenAce92]

what the hell is it controlled only by a rudder? drooping wings too not good

[pete2778]

Nope, you can clearly see the ailerons on take off, anhedral isn't necessarily always bad, it is often used to increase roll response and it's negative effects are normally quite controllable with moderate anhedral such as this. The pilot didn't get too much chance to try his ailerons OR rudder though, he was too busy fighting the elevator all the way to the ground (Pilot Induced Oscillation, PIO).

[villagepunks]

i had the same problem with v1 fieseler von reichenberg

[duckpk10]

the tail areofoil shud be inverted as the thrust pulls it over

[phippsa3]

Looks like a rearwards c of g to me. Possibly rates to high on the elevator also.

[unclesara]

P.I.O.

[unapro3]

Agreed.

[pete2778]

Definitely too nose heavy, ie too forward c of g exacerbated by a high thrust line. A rearward c of g would have probably resulted in a departure in one direction or the other (stall/spin) and would most likely have been far more damaging. There's an old maxim: "A nose heavy aeroplane flies badly, a tail heavy aeroplane flies once!"

[lrdiscoveryII]

"experimental" ??

[chrispacmen]

yes, HOME MADE!!!!!

[pottoka6419]

ahahahahahahahahah!!! lol lol lol lol lol!!!

mdr! and this plane is very strange!! ohohohohohohihihihihihihahahah­ahaha!!!!

[tjtg]

Correct C of G is a beautiful thing

[Art456654]

again again again one more time please hahhahahah

[33Hz]

None of the above guys. Problem is clearly down to a totally inappropriate thrust line. Look where the fricken motor and prop are vs the rest of the plane...!!!

[airlinerdude12]

agreed, if the motor is too high it will veer downwards due to gravitational forces and the trim of the motor

[pete2778]

I've designed built and flown plenty of models with high thrustlines, normally up-thrust is added to compensate for the nose down pitching moment with a high thrustline. I still think the forward c of g was the deciding factor. The high thrust line creating a nose down pitching moment and a LOT of prop wash over a high tailplane with too much control throw were contributory factors. Glad that it isn't totally destroyed, I suspect that one day it will fly well.

[Inaccount]

too heavy!

[arado240dd]

looks like nose too heavy or too much down elevator trim.

[helipilot27]

C.G. way off

[schymcgee]

Roger that!!

[polokka777]

操作ミスでしょうか？

[polokka777]

原因は何でしょうか？

操作ミス？