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HelicopterHIROBOOther › Sceadu Explosion!
04-28-2004 10:27 PM  13 years agoPost 1
HeliNerd

rrApprentice

Navarre, FL

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Well, what can I say- explosion is the only word to descibe what happened to my poor sceadu today. If you have followed the recent posts I have made, you might note that I have been struggling with the blades going out of track/woofing for awhile. Well, I got that problem fixed and was having a blast getting to know my sceadu again!!
Flew 4 flights yesterday, and 4 today. On the 4th one, halfway through the tank, I half rolled to inverted and pushed the nose up into an outside loop. as soon as the nose went into the wind, the headspeed degraded with the application of collective and FORWARD cyclic--- then BOOOM!! It was all over. Whoof and Poof. Pieces falling all over the place and the majority of them balled up and fell 200 feet to the pavement. I did manage to shut the engine off on it's way down though- so no funky chicken. The sceadu and it's gear are a total loss. RX, GV-1,gy401/9254, 9252, 9202's all destroyed. I might be able to replace some cases/gearsets but I worry about the gyro and 9254. Also, my NIMH battery exploded and leaked acid eveywhere. Believe it or not, the canopy lived....


I will post pics on monday. It's disgusting, and I will not be flying heli's again for a long time. I'm gonna take a long awaited break from speding all this money. I basically converted 1000$$ to a bag of trash plastic. The worst part is that nobody was there to see it.

When and if I get another, IT WILL NOT be a Hirobo or Raptor.
Flutter once, shame on you. Flutter twice, Shame on me.
I learned my lesson and i'm done.
The last good pics of her-- RIP baby.

Later,
Ryan

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04-28-2004 10:30 PM  13 years agoPost 2
Dr Lodge

rrElite Veteran

Guildford, Surrey - UK

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Wow, I really want to know what happened there, I've got a Freya and Sceadu EVO part built...

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04-28-2004 10:34 PM  13 years agoPost 3
Greg McFadden

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Richland, WA

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was that a sceadu or teh sceadu Evo that exploded on you?

The silence often, of pure innocence persuades, when speaking fails

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04-28-2004 10:36 PM  13 years agoPost 4
HeliNerd

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Navarre, FL

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It was basically an evo.. I had everything EVO on there, except the frames. Sucks ass man. I didn't see it coming, and it didn't come apart. It was a true whoof and POOOF!

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04-28-2004 10:49 PM  13 years agoPost 5
Greg McFadden

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Richland, WA

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Drop Jeff a line, maybe he'll be able to help you out.

The silence often, of pure innocence persuades, when speaking fails

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04-28-2004 10:51 PM  13 years agoPost 6
HeliNerd

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Navarre, FL

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Nothing left to help with.. It's gone bro! I'm just gonna lurk from now on.

BTW, I was using MAH blades, and had +11 -11 with 6 deg. of cyclic pitch. The governer was on, so there's no reason my headspeed should of degraded. I do the same maneuver all day long without this result. I know it was a whooof and Pooof by the sound of it.. then the blades hit the tail. I also know that the blades were on the tight side, and they are still nice and tight in their grips as we speak.

Any suggestions, or prior experiences from anybody else??

Ryan

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04-28-2004 10:56 PM  13 years agoPost 7
blakka_1

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London/Enfield

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same thing happened to me.

blades hit boom on my evo. no real explanation of why it happened.

i was running even less pitch then you dude, i was running 10 10 pitch with MAH blades. govenor on. blades were also tight.

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04-28-2004 11:11 PM  13 years agoPost 8
Greg McFadden

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Richland, WA

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I wonder if it was a woof and poof or a "decayed headspeed boom decapitation". if it was the second, that will happen on any helicopter when you try to pull more power out of the engine than it can provide and you are at the same time trying to pull the blades towards the boom.... (the magic word collective management comes in here)
from your prior post (if it was a boom decapitation) it sounds like you tried to suck more power out of the engine than it could provide and no governor in the world can help with this. (I have seen this happen way too many times on many different models, and every so often a boom gets sliced off). What you might try in the future is reducing your top end pitch a bit and running a bit higher headspeed. run say +/-9 or +/-10 and a higher headspeed. I noticed that you are running a MP1, that could also be a problem as if the governor is not perfectly set up the two can fight each other.

blakka_1, this explains what happened to you probably too.

The silence often, of pure innocence persuades, when speaking fails

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04-28-2004 11:16 PM  13 years agoPost 9
blakka_1

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London/Enfield

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i was only using 10 pitch though! im sure the os50 can handle 10 pitch. i think its a combination between blades and the heli, i dont think the two like each over. those mah blades are pretty aggressive. this is the 4th time ive heard of this happening. all 4 times MAH blades were being used.

i was running standard muffler that comes with evo kit, and a head speed of 1900 wen my blades hit boom. ( tail was not chopped off, blades only made dent in boom )

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04-28-2004 11:23 PM  13 years agoPost 10
mrNoodles

rrProfessor

Borlänge, Sweden

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I´ve just ordered MAH600´s for my Sceadu.

Interesting...

/Fredrik
'Hm now I just have to find out where to connect the GV1 sensor to the Jazz80 ESC.

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04-28-2004 11:36 PM  13 years agoPost 11
HeliNerd

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Navarre, FL

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and you are at the same time trying to pull the blades towards the boom.
I was PUSHING the disk forward... and really gentle too. I estimate having less than 6 degrees of pitch at the time, and less than 1/4 forward cyclic. After the heli hit, I ran through what I was doing again, before i got a chance to forget and that's what i remember. It wasn't a violent move like a piro flip or anything, just a simple half roll and pushout to an outside loop. I know i wasn't using anywhere near full collective or cyclic. That's why i'm confused

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04-28-2004 11:43 PM  13 years agoPost 12
Greg McFadden

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Richland, WA

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the problem isn't just the pitch, it is how you use it, remember 10 isn't the max pitch you can get. (example taken off of my SE, +/- 10.5 pitch but the max deflection of the blades is 17 on one of the blades (4 on the other) on the other in hard cyclic) those full deflection hard cyclic manoevers put a hell of a load on the engine, far beyond what it would experience at a normal full throttle full collective climbout.

this is one thing that I have not gotten G2 to do well, on G2 the engine boggs, but I can't seem to program the heli to mid-air boomstrike (iff possible) I am still playing with power and pitch ranges to try to get a sim helicoptet rhat can so this can be practiced.

One thing I am curious is what is the chord of the MAH blades you are running (I've always run SAB's and V-blades, I liked the V-blades for autoing but the sab's seem to load the head less and are more agile)

The silence often, of pure innocence persuades, when speaking fails

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04-28-2004 11:46 PM  13 years agoPost 13
Greg McFadden

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Richland, WA

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helinerd has me confused. very odd thing to have happen... hmmn... hey helinerd, how were the bearings in the mixing arms on the head? when was the last time you replaced the dampners? the reason I say this is that I have been flying a standard scoob for quite a while now and I just replaced the bearings and dampners recently and the new bearings eliminated almost all the slop on the head linkages while the dampeners (which I replace every 50-75 flights, sometimes less, whenever they feel a bit sqishier than usual). any significant slop in those links and in those dampners can just kill you. (I also recommend replacing the dampeners after ANY kind of rotor - ground or rotor - boom interaction)

PS. I am liking these cheap bearings i bougth for ~1.30 each (you need 10 for the head)

The silence often, of pure innocence persuades, when speaking fails

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04-28-2004 11:48 PM  13 years agoPost 14
blakka_1

rrElite Veteran

London/Enfield

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the problem isn't just the pitch, it is how you use it
very true greg

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04-28-2004 11:57 PM  13 years agoPost 15
Jason Cummings

rrVeteran

St. Louis

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I have a stupid question

You didn't forget to switch to idle up did you? It could have stayed on the gov until you started pulling more negative pitch.

Send it to MRC, if there's a problem they would want to know and find a fix for it.

Synergy Field Rep

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04-29-2004 12:02 AM  13 years agoPost 16
HeliNerd

rrApprentice

Navarre, FL

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the whole head was brand new. Thrust bearings, dampners, the regular bearings, grips, washout base and arms, new links and balls. Sorry to confuse you.

I was in idle1.. cause i flipped it to normal in a frenzy to shut the motor off with the trim as it fell to it's death

you're all right on the use of pitch. I wasn't using much, but with the wind at about 5 knots, maybe it just loaded the head down a little too much. Was running 1870 RPM BTW just like always

49 mm chord on the MAH's greg

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04-29-2004 12:08 AM  13 years agoPost 17
Greg McFadden

rrKey Veteran

Richland, WA

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from what you said, this should not have happened.

I wonder if something failed on the head (a ball link or something like that, that would cause a rather rapid death if the wrong one failed)

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04-29-2004 12:15 AM  13 years agoPost 18
HeliNerd

rrApprentice

Navarre, FL

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Yes, It shouldn't have.. but it did. Coulda been a link, a strong gust of wind at the wrong time, bad fuel, I don't know.

If anybody want's pics, email me and i'll send them

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04-29-2004 12:16 AM  13 years agoPost 19
Greg McFadden

rrKey Veteran

Richland, WA

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take some pictures, and write Jeff Green an email about what happened. He will take care of you. I just wish we could figure out what happened....

The silence often, of pure innocence persuades, when speaking fails

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04-29-2004 12:33 AM  13 years agoPost 20
blakka_1

rrElite Veteran

London/Enfield

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the next time this happens, i bet the guy it happens to is using MAH blades.

!!!! im not knocking MAH blades as they rock!!!!

!!! not knocking the evo, cause it rocks too!!!!

just think they arent made for each other

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HelicopterHIROBOOther › Sceadu Explosion!
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