Having A Blade Break In Flight!
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- เผยแพร่เมื่อ 1 มิ.ย. 2023
- In this video we get the second flight in on the SAB Comet Number two. Unfortunately it didn’t end well. Having the blade crack in flight and luckily I was able to land with Minimal damage. Need blades and a few parts it will be flying again!
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You pushed the blades to the limit. So you were actually extremely lucky today that you ended the flight at the right time and saved the whole machine, I would call this an epic safe Jeff.
Thank you! The Blades and helicopter were use so I really have no idea the life of those blades I should’ve replaced them from the start but I will now! I’m glad it was not worse!
1. You should have bought a lottery ticket on your way home.
2. The sound and speed is awesome.
3. Helicopter and drone pilots should make it self mandated to have a control camera whenever they fly.
4. Good save! My eyes got big when I saw that elevator servo horn.
Lol I should of! I never buy them. Thank you, I record every flight and I don’t always post it but in cases of I have it LOL yes, it twisted that horn like it was nothing.
WOW! Very lucky that it gave out just as you were landing.
My thought on it is the blade cracked in flight. With the centripetal force of the rotor, spinning blade was able to stay straight as I cut the power back and rpm drop. The centripetal force on the blade was no longer there in the full weight of the helicopter as it’s cool down finished breaking it.
SAB should replace any parts or main blades that caused the accident to happen. I would definitely contact them and show the video regarding the main blades breaking in mid flight. Good luck rebuilding the heli.
They don’t do anything. I bought a battery tray from #amainhobbies for my Trex 500. The plastic retaining clip on the tray broke mid air second flight, battery ejected and smacked the tail, trashed the battery, blades, everything. Amain refused to do anything, not even a discount to replace the parts. Align didn’t even respond.
So the helicopter was purchased used so I do not know the history of the blades or the model for that fact, I did go through and redo it, but the blades could have a ton of lights on them and just be overdue. SAB is very good and if it was a brand new helicopter, they would’ve already been sending replacement parts.
Sorry to hear that! I don’t know about Align but SAB is very good about sending replacement parts if it is a product failure. Unfortunately, this model was purchased used so I don’t know the history.
OMG Lucky you know your rc stuff, good call to land it, well done. and thanks for sharing all your knowledge.
Thank you! It is part of the hobby. I share anything and everything with you guys and want you to know that this stuff does happen even to me.
This heli sounds incredible!
It really does!
I have been flying helis since '93 and have never seen anything like that one. I wonder if that is a defect in the blades.... These kids now routinely over-speed the hell out of their blades and have no problems at all. You might want to see what blades Minicopter and Henseleit use on speed machines. Good job on getting it down safe!
You can definitely over speed blades all day long way past 3000 RPM. I purchased a model used. I have no idea the history of the helicopter or the blades. I have a feeling the Heli has been tipped over before as there was a mark on the root of the blades from them hitting the grips. They probably had a micro fracture and it finally just let go. I have X blades coming.
That my friend was an epic save
It was! I don’t know if it was just pure luck or what lol
Man that thing is fast. Too fast for me. Thank God the break didn't happen at high speed....you must be doing something right! 👍🧙♂
It’s moving pretty good! I don’t know if I’m doing something right or just got extremely lucky lol
Gahhhh dang, well I guess I need a heli now! 🤣
you definitely need a Heli!
Amazingly fast helicopter! the stress loads have to be very high and magnified with every movement of the swash. I can only imagine the destruction that would have occurred if the blade separated on one of those high-speed passes.
My thought is this, the blade cracked in flight, but with the centripetal force on the road, or it was able to stay perfectly straight until I lowered the head speed. It could’ve been a lot worse!
Well that was a good call to land when you did,because that could have been a lot worse sir.
It could’ve been catastrophic to the machine. Crash at these speeds is devastating.
I may absolutely and completely wrong. But this is my theory. Your break has like a .01% of happening. So what I think happened is you hit something in flight in the exact spot of the blade where the break happened. Kind of when a windshield is hit by a rock, there is a small crack and then the crack extends to the sides. So my theory is something hit the blade, the crack opened up, this caused the blade to lose strength. But because of the centrifugal force the blade and because the blade has a safety wire, you experienced vibration but the blade remained straight. When you spooled down the blade lost it and that's when it cracked along the blade vertically, and when you paused the video is actually when the blade cracked and bent upwards.
One heck of a theory and (in my opinion) makes perfect sense. How else would a blade withstand these forces and crack upon landing and spool down... Great insight and I think too that this is what must have happened.
That is a great theory! I have a feeling something like that as well but I don’t believe I hit anything. I believe the blade had a micro fracture or something in it and the blade cracked on the last pass because it made a weird sound, which you can’t hear in the video and it pitched down which it never has before. With the blade spinning at 2500 RPM the centripetal force kept the blade perfectly straight and as the RPM dropped right before a touchdown, the full weight of the model was on the blade now and causing it to finish breaking.
Amazing it didn't happen in flight!!!
Very lucky!
Maybe 13 degrees is a little to much for comet? Thats my guess, or maybe just manufacturing defect? At least it made it to the ground safely happy flying man!
Thank you! You as well. SAB recommendation on the comet is 16° of pitch. At 2600 RPM head speed. I am running on this one 13° of pitch at 2500 RPM had to speed my yellow one is at 22° of pitch at 3000 RPM at speed. I believe the blade was stress cracked or fractured prior as this helicopter was purchased used and I have no idea the history of the blades.
Hi! I think that what happened to the helicopter at 6:44 in the video was because of the ground resonance effect. This phenomenon occurs in the life-size helicopters and is caused when the main landing gear is not able to dampen the vibrations of the main rotor.
If that was the case, the blade would’ve had to hit something to break. You can see in the frozen part of the video that the blade was angled up and the massive vibration started prior to the landing. I felt the helicopter do something weird and it made a noise and that was the blade cracking.
Wow that could have been so much worse.
Good instinct to cut flight early 👍🏻
It could’ve been a lot worse! Sometimes when you get that feeling, it’s always good to go with it!
Yup it's a beast
It really is!
wow great save, my friend. very lucky indeed, although you weren't pushing it as hard as you could I do agree with the slight fracture in the carbon, that speed and forces to the blade would be enough to stress it until it broke, agree the CF force would have keept it straightish until the lower headspeed, then boom and bang, just goes to show how everything needs to be perfect, with this speed the forces on the helicopter are emense, great save and again thanks for posting I watching you guys cos I want to see you break the current record, then Im going for it myself!!!!!!!! all the best. kepp em comming
It was definitely a lucky timing and safe and the damage is very minimal and it could’ve been catastrophic. Unfortunately even at 160+ miles per hour if one of these go in there is not much left. The comment that it is going to break the record has just got a new set up ordered a lot more power! Once that gets here with new blades it will be time to test! You should definitely go for it! What model are you thinking to use?
@@westhobbiesrc8051 Hi guys, I was looking at the Diablo speed, but the fuselage is quite expensive, alternatively like yourself a 700 comet, I may well end up creating my own fuselage, and base the mechanics off a TDR 11, I'm still exploring the different possibilities, but I wish you guys all the luck at breaking the current record, you've got my attension anyway. all the best keep em comming.
@@heliman9552 The Diablo speed is very nice but definitely need an expensive kit. I have looked at them myself a few times and still might pick one up in the future. I am going to mold this fuselage and make some changes aerodynamically and get rid of a few things hopefully pick up a few more miles per hour. Thank you!
I've always wondered about how much stress these blades are under and how much there're rated to take. Could've been a defect in manufacturing or just over stressed. This could have been catastrophic in full flight mode. Maybe a reminder to fully inspect our machines prior to flight although I know you can not catch everything. Thanks for the videos!!
Speed helicopters at this RPM are under a tremendous amount of stress. Some speed guys will replace their blades every 50 flights! There could’ve been a micro fracture in the blade that I just did not catch. Unfortunately as much preflight as we do, we can’t catch everything.
holy shit. thank god that wasn't mid flight
It would’ve been catastrophic to the helicopter
That really moves out, fast. Are there stronger blades for the speed?
It moves pretty good! Yes, there is much stronger and better blades. I have some coming.
I’m curious as to whether a the head dampeners had anything to do with it. Maybe softer ones it would let the blades flex farther under load, but I feel like at those speeds you’d want everything as tight as possible
I think the blades were just overflown. Unfortunately, with speed helicopters, the blades are under tremendous stress to the point of replacing them quite often. you want a super rigid head with no play.
Very lucky this did not happen in the air. Hope you get this up soon 🫡
It will be up very soon again! Parts are ordered just have to wait on them LOL it cracked in flight, but the RPM and scientifical force kept the blade straight as the RPM dropped the centrifugal force was not as much allowing the full weight of the helicopter to be on the blade and officially breaking.
😮 way to fast for me!.
Excellent job.
Thank you! It will only get faster!
Wow amazing flying wish you could come set my sab goblin 570 with 600 blades up for me it would give me so much more confidence
Thank you! What setup is on the Goblin 570?
@@westhobbiesrc8051 it’s got the castle 120 phoenix edge esc and a scorpion hklll 4025-650kv motor
Wow that could have been much worse, do you figure there was a factory defect in the blade? How many flights on that machine? Been contemplating buying one of these, found a pretty good deal on one with the retracts. Which model KDE motor is that you are using?
Thanks for all the great videos.
It could’ve been a lot worse! With the RPM of the rotor the centrifugal force kept the blade perfectly straight after it cracked. As the RPM got lower the full weight of the Helicopter was on the blade which fully broke it. I bought the model used so I have no idea history of it. I’ve got another one that is yellow with the retract and everything. It’s the KDE 750 450 KV I believe. Thank you for watching!
Impressive flight as always Jeff! Glad to see it went as well as it did. When do you think you'll have your actual speed record Comet going? You did mention in a different video with the actual Comet that you're planning on breaking the world record for the fastest radio controled helicopter right? Or did I just imagine that?
Yes, I have a completely different comet that is yellow for the speed record. It has been flown a few times already on 14s. Just ordered everything for 16s.
you were lucky what happened on the ground.
if it happened to you in flight you could have thrown the helicopter.
Luckily it went this mode
Very lucky! My theory is this, the blade cracked on that last pass. I noticed something in the air and the main reason I decided to shut it down. As the head speed dropped, the blade was no longer under centrifugal force like it was prior so that allows the full weight of the helicopter to be on the blade and causing it to fully break.
What kinds of speeds is it hitting in this video? Sweet flying!
Thank you! Around 160-170mph. Nothing crazy.
Holy shit - no other way of saying it and SAB blades too! WTF?
So I’m not pointing blame on anybody or any company. Unfortunately the model was purchased used. I don’t know the history of the model or the blades and there might’ve been an incident prior where the helicopter was tipped over or something happened to the blade causing a microfracture stress, crack that I just didn’t notice.
@@westhobbiesrc8051 yes fair comment and fair play - I'm super pleased it happened on the ground where you were able to prevent much more damage but imagine that happening on a speed run, my god..........
quite amazing that it let go after you cut the motor... would have been a lot worse at full power and in flight... did you buy a lotto ticket?
No I did not LOL my theory is this, with the speed of the rotor the centrifugal force kept the blades straight. As the RPM dropped the full weight of the helicopter was on the blade now and that is when it officially let go.
@@westhobbiesrc8051 Do you have a negative pitch on your throttle hold profile? Not that it really matters as those blades would have experienced far more stress in flight than shortly after TH...
@@davids8345 yes, full linear pitch curve on throttle hold but upon landing I probably didn’t even touch 2° of negative pitch. I run the same pitch curve on all my helicopters.
Wow, crazy thing……..but is it really necessary by this kind of crash to change the main shaft…..? Thanks!
Very crazy! So, I replaced my feathering and mainshaft every hundred flights regardless. Anytime there’s any incident regardless if it’s a tip over or hard crash I replace them as well. Micro fractures and micro stressing is a thing on them and can cause a failure and it’s not worth it to me.
Hi Jeff sorry blade snapped flight was amazing , would you mind me asking a question on how tight you run your motor belt because I’ve just set my 580 kraken up and on second battery esc or motor started bleeping lost all power, lucky just taking off it happened again this weekend lost power on second battery lucky auto in , motor gets very hot I’m thinking either overheating or battery not good any thoughts , 👍🏻
I rung them pretty tight, what ESC are you using? That sounds like an Esc problem.
@@westhobbiesrc8051 hobbywing 130 👍🏻
I have a theory on how that main rotor blade broke:
a. It didn't break as a result of fatigue.
b. Ground resonance is the cause.
I slowed the video right the way down to 0.25 times the normal playback speed, & zoomed right in on the helicopter. I noticed that as soon as the helicopter landed, it started to shake quite violently (a few frames before the blade actually broke).
That shaking is called ground resonance, which is caused by the impact shockwaves from landing interacting with the main rotor. It induces a violent shaking & the helicopter will quite literally shake itself apart.
That same shaking is what caused your blade to break.
With that being said, I can rule out blade fatigue, & manufacturing defects. You also stated (in previous videos, as well as in the comments here) that you put this helicopter under close scrutiny _before_ you got her airworthy. Therefore, you already would have picked up on any signs of damage on the main rotor blades & replaced them before your first flight with the helicopter.
That is a theory, but highly unlikely. I fly hundreds of helicopters all the time and never have that issue. Anytime there is a massive vibration. There is a reason for it. I know on full scale they can get vibration but it’s just not the same. if the blade cracked inflate the centripetal force of the rotor at 2500 RPM with keep the blade perfectly straight as the RPM decreased the centrifugal force isn’t as much and allowing the full weight of the Heli to be on the blade. Witch finished the break. You can see I. The video the blade was up a significant angle, and the only reason for that is a break. You can look over them as good as you want but if there is a fracture on the inside of the carbon or just a weak part of the blade, you will never see it. The model was purchased used and there is no telling how many flights are on these blades.
And the Blade would’ve had to hit something to break and it did not hit anything
On what basis are you replacing the fathering shaft?
I replace feathering shafts annd main shafts every hundred flights on my helicopters. Especially when turning 2500/2600 RPM. With the blade breaking in there being massive vibrations it’s time to just pull it completely apart and replace them so I know everything is good.
@@westhobbiesrc8051 Thanks. That makes sense to me. The «crash» itself did not seem hard enough to bend the feathering shaft which made me wonder. Keep on going! 👍
@@pettersollihgda8953 The crash itself is not enough to bend or mess up any shaft but micro fracturing the shaft or stressing it is a thing and can cause premature failure. Thank you!
What do you use for a field charger.
My main charger lol I have a charge case that I built. So I use either my Thunder Tiger 820 (old charger lol) or my ISDT P30s.
@@westhobbiesrc8051 thank you . Did you do a video on your charge case .
@@stevealoia No because it’s a old setup but I’m going to build a new one soon and I’ll do a video on that!
wow I didn't carbon blades broke like that
It’s not common! It’s very rare to have a carbon blade break, but it can happen
I see you have TWO Goblins, one yellow and black. Why did you tell me you had only one. You’re pretty good telling me this.
Because the black one in this video is not mine. mine is the yellow one. I only have one big comment and one small. This one is a good buddy of mine who is letting me keep it for a while to do practice flying on so I don’t put mini flights on my yellow one.
Interesting, I never heard of friends who would let you fly his ship and cracked that up.
Because I am looking for that kit in trade of my Genesis. I’m not joking.
@@kennethkressler8134 I fly people stuff all the time. Friends and random people.
How on earth can it crack when landing and not at the time of the speed runs??? I am lost. Hard to watch these kind of things, hate it when that happens :(
Here is my theory, the blade was stressed/microfracture from previous flights or incidents. I bought the model used so I don’t know the history of the blades ( I know I should of replaced them) the blade cracked on the last speed pass as I heard some thing and the model dove which was very weird. With the head spinning at 2500 RPM the centripetal force on the blade is so strong that it would keep it perfectly straight. As the rpm dropped, the centripetal force isn’t as much allowing the full weights of the heli to be on the blades which allowed it to finish breaking.
That could have been soooo much worse !!!
Yes it could have! Would’ve been a catastrophic losses if it went in.
Yo jeff. So I refunded the vbar and got a raw 580. Would you recommend tge stock pinion for 1600-2000 rpm?
Yes, the stock pulley is fine. I would recommend going with the soft head dampener so you don’t get a head wobble. The 70/90.
Cough…Cough…KBAR…cough..cough
@@RC-Heli-Overdose420 nah I returned to ikon, it’s the way to go
@@Twx97 I was kidding icon is probably the way to go, I fly a kbar becuase I’m cheap ass but if I could afford something better I’d try icon, Vbar looks nice but Vcontrol is so expensive, cheers and happy flying
How many price this helicopter
Around $3500 USD flying
Chinese carbon fiber, crap....
lol SAB is made in Italy…