Crash

[Roadrune]

Put it in today, bad....:thumbdown:

Just put in battery #2 for the day, lift off, go straight in to full forward, and after 100meters or so, i break it straight up, going for a stall turn, just as i vent up, it was a funny sound, still climbing it hits me, i have no motor-power...The belt must have tracked off the pinion (can still hear the motor reving).

So when i realized the problem, the headspeed was really low, i was able to steer it down on the skids, but not brake the speed.

So i landed after pretty much a straight drop from 50 meters or so (it climbed to full height in the stall turn) right on tarmac:Slap

Damage was:

Landing gear (duh)
Frame (both sides, completely shattered)
Tail-case
Pitch slider
Main-blade holder
Tail fin
Canopy post

Not bad, really, the blade holder i believe would have survived if i wasnt going flybarless, i have a long ball on it, so it had to happen....

So my question: anyone else had their belt go off track? i cannot belive how it could happen, really... but it was cold and i didn't check the tension, so could it have been so loose, at the tail, that it skipped a tooth on the main gear making it leave the pinion?

I have heard a sound during hard pitching earlier, i guess i just found out what it was...Always thought it was the "famous" tracking problem, since i decided to keep the old blade holders untill they died.

[NTM]

Probably your pinion slipping or the one way letting go if you were hearing a noise previous to it losing power.

Regards,
Nathan

[Roadrune]

Probably your pinion slipping or the one way letting go if you were hearing a noise previous to it losing power.

Regards,
Nathan

I doubt it, i have heard the same noise before, and it sounds more like the belt slipping, then any metal giving up...

And the belt was wrapped back with the main gear, and i don't see that happen in the crash.

[Jimmy!]

That really sucks, man! but you know what:

:Pics

[Roadrune]

That really sucks, man! but you know what:

:Pics


I know, actually i was just waiting for that one :D

Pics will be up by tomorrow, having a bit of trouble with my other computer with Photoshop, so i'll upload as soon as they are resized...

[NTM]

The belt would have to be extraordinarily loose to track off the main gear, I just tested it with mine by slacking off the belt. Virtually impossible for it to come off the pinion without coming off the main gear first.

The only other thing I could see would be perhaps a loose lower mainshaft retaining bolt. That might allow the main gear/main shaft to move up enough to allow the belt to "derail". It would also explain the noise you were experiencing previously, the main gear rubbing on the frame.

Regards,
Nathan

[Roadrune]

Well, i have been removing the belt a couple of times simply by sliding it off the main gear, no problem to do that....

I think you are correct that it must have come off the mains first, maybe the noise might have been the belt climbing the mains?

[NTM]

Well, i have been removing the belt a couple of times simply by sliding it off the main gear, no problem to do that....

I think you are correct that it must have come off the mains first, maybe the noise might have been the belt climbing the mains?

The belts height on the main gear is purely dictated by the front and rear idler pullies though. I suppose if it was loose enough to skip for an extended period it might kick up or down, the belt would have to be quite loose though I would think.

[EricW]

Sorry for your crash Rune...
That can indeed only happen when it has room to climb that high.
We set it up for smoothness at room temperature, but with very low outside temperatures the tail tube shrinks more than a warmed-up belt, so i set my tension a bit higher in cold weather just to be save.
Maybe makes a Carbon tube more attractive, much lower linear expansion Coefficient .

[Roadrune]

Pics :)

[Big E]

Roadrune,

Time to upgrade to the Carbon Frame, Infinity or MSH, either one of them would be a great investment since you have to rebuild anyway.

I noticed in one of your pics that one of the main blades is on backwards. I assume that you just put them back on for photo purposes but not sure.

The belt coming off is a new one on me. I had a couple of not so minor crashes because my pinion one-way bearing was letting go during hard 3D maneuvers. I thought that I was over-amping the motor but figured out that packing the one-way with grease was the culprit.

[Roadrune]

The blade holder is just flipped 180degrees:D the arm broke in the crash, and it just became that way, you can see the blade is the wrong way aswell:thumbup:

[4cyclic]

Sorry to hear about your crash.
the noise your heard on hard pitch pumping is the slack belt. You need to watch this.
Tighten up the belt if you hear any noise on hard pitch or tic-tocs. I also can't see how the belt can ride up the pinion, with all the belt guides pulleys.

[simmer]

Sorry for the crash. Tarmac is hard stuff. Makes me wonder how forgiving snow is.
can we get a rough price on the damage?

[Roadrune]

Sorry for the crash. Tarmac is hard stuff. Makes me wonder how forgiving snow is.
can we get a rough price on the damage?

No, actually you can get the exact price.

$28,94, cheapest crash i ever had:D

[simmer]

Wow that is sweet! and you landed on asphalt / tar ok crash landed, that is a very reasonable crash price.

I have been looking at my belt and it runs a little on the high side of the main gear. Ill be keeping an eye on that, but the possible culprit for my mis alignment is the idler pulley up front. I stripped a screw there I think and have since ordered and recieved the part, but not put it in yet. I put in a screw that was too long during assembly. Hmm close eye on that, maybe Ill just change it now I think of it.

The other alignment culprit could be the motor shaft (mount, adj screws) not 90 to main gear.

[povern]

Looks like the flybar flew right out of the heli ;)

Sorry to hear about the crash.

I think what caused it was the align Velcro straps.

[Roadrune]

Looks like the flybar flew right out of the heli ;)

Sorry to hear about the crash.

I think what caused it was the align Velcro straps.

Actually the flybar disapeared some time ago, but it flew so well without it, i didn't bother searching for it:D

I too have been worried about those straps, it's probably housing a Poltergeist.

So: HEY CORRADO get us some MSH velcro straps ASAP, before another one crash:YeaBaby::banana

[Thunder Fighter]

Maybe the motor and motor plate moved back towards the main gear. When Kgfly and I were out with his Protos a while ago, it was making a noise under load, when he got home and checked it, the motor plate had moved back, allowing the belt to be too loose. If it did move back in one jump when you went vertical it could have the effect of not driving the main belt while still having the motor spin.

//Dennis.

[simmer]

Yup NICE Dennis This is a good posibility I think. The loads placed would drive the plate that direction, if it slid in flight it could cause a slip.

[Bradley Jones]

ouch!

[Bradley Jones]

No, actually you can get the exact price.

$28,94, cheapest crash i ever had:D

Sweet!!! I crash my blade 400 and it cost me around 15 bucks every time, thats why I like the protos, I researched parts replacement and the cost of parts is fantastic.

[ayash]

What parts are worth having a private stock of? Meaning - which are the most common to break?

[Roadrune]

What parts are worth having a private stock of? Meaning - which are the most common to break?

Main shaft, feathering shaft, tail shaft, boom, tail-blades, main blades, tail case, links, landing gear.

[JMoore12]

What parts are worth having a private stock of? Meaning - which are the most common to break?

All of the shafts, tail boom, upper mixers, seesaw, flybar and tail case comes to mind.