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Thunder Power RC . Mikado Modellhubschrauber . GrandRC

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e-Thunder Tiger Raptor E Series > E325 Explodes in Mid Air
 
 
msinawsk
Heliman
Location: PA

lucky me....my mini did this trick again...
mid air..nothing around...poof....
exploded again.. second time. thinking back i had an issue with my raptor 30 with the woof and poofs..wondering if the mini titan is having the same issue? any clues?
11-03-2008 02:26 AM
 
 
helicraze
Key Veteran
Location: Victoria - Australia

Links or high headspeed

Logo 700 X 2
11-03-2008 02:31 AM
 
 
Vincenso31
New Heliman
Location: Indiana

same here

Glad to know mines not the only one. It exploded the 2nd time I ever flew it! Headspeed is about 3k. I have know idea whats going on. Its happened to me 4 times now with all new parts each time. I have trex balls and links throughout. It seems to happen when I apply full collective. At first it would happen on spool up at about 0 pitch, so theres no rhyme or reason. Is the main shaft too soft?? This is ridiculous! I really dont want to visit the ER because my model helicopter exploded on me!
11-07-2008 02:19 AM
 
 
msinawsk
Heliman
Location: PA

i absolutely agree, have a full g force metal head, metal bearing blocks, new shaft, and she still does it... not a clue...am disappointed
11-07-2008 02:24 AM
 
 
Gam
Senior Heliman
Location: Australia

I've had no problems since replacing the frame, but I'm 99% sure that is what caused mine.Since then 30+ flights an no problems.

I have no idea why a brand new chopped would explode in mid air
11-08-2008 05:43 AM
 
 
what_the_helli
Veteran
Location: cookeville, tn USA

I exploded my trex450 INSIDE my LHS. I had just rebuilt it from a minor crash and was just going to spool it up a little. Just as it got light on the skids BAM! we tracked it down to a cracked blade grip I missed. That crash was MUCH worse and took 3x as long to rebuild!

I almost had to buy a trex500 in less than new condition that day a rouge main blade missed it by inches. My buddy tried in vain to pull off a matrix move only to be hit by the other main some 20' away, luckily he was not hurt.

Needless to say I no longer spool my 450's up inside and I show them a lot more respect!!

Proud member of
KBDD Int'l & Compass Models Team
Team RcHeliWorkz.com
11-08-2008 06:15 AM
 
 
fenderstrat
Elite Veteran
Location: Aston,Pa

I have THOUSANDS of flights on my MT,of the guys that are having problems,how many are using align balls/links??

mine are stock,but people that have switched,is there a possibilty the new holes were not drilled/tapped correct?

are you guys using a reamer on the links??I have also never done this,as I dont think its necessary,but are people making the links too loose??

also are the people with problems using the hs65's?did you have to weaken the frame at all??I use the 56's so I never had to do any mods and I'm just asking out of curiosity

PerformancePlusRC field rep
COMPASS helis field rep
Mini Titan/SE
HBK2
Futaba FASST
11-08-2008 08:25 PM
 
 
Gam
Senior Heliman
Location: Australia

Probably not the best person to answer, as I'm sure my cause was the frame (after seven crashes, some of which were at high speed and impressive to watch ) - however:

ACE Balls and Links - never had a problem there.
Don't use a reamer.
I do use HS-65MGs, and have enlarged the servo mounts, but they are rock solid, and I've never had any issues with them or their mounts. You don't need to remove much to fit them, and if you use a Dremel then it's a neat easy fit. Where my frame broke was at the engine mount.
11-08-2008 09:31 PM
 
 
fenderstrat
Elite Veteran
Location: Aston,Pa

this whole thing is just weird,there are lots of guys flying these helis,I'm really curious about this.

I wish all people having this problem could post their exact model ,any mods/upgrades and complete set ups

especailly headspeeds as I see guys running some CRAZY headspeeds now a days

there was a thread a while back about the turnigy green motor and I think one guys set up came out to close to 4000rpm

guys flying the SE should be ok,but I wouldn't want to be flying near the guy with a plastic head and a 4000rpm headspeed

PerformancePlusRC field rep
COMPASS helis field rep
Mini Titan/SE
HBK2
Futaba FASST
11-09-2008 05:27 AM
 
 
ECOHELI
Veteran
Location: new york

has this happened to anyone using the kasama head? i had it happen to me a while back when using my g-force metal head with stock plastic grips and align balls/links. it just exploded in mid air and thought it was something i did. i have on hand a full kasama head and just wondered if i use it will i have the same problem?
11-09-2008 06:07 PM
 
 
Vincenso31
New Heliman
Location: Indiana

blade dampening

Ok, after much trial and error, I have found that you MUST have very stiff dampening in the head. I have found that the stiffer the dampening, the less high speed vibration the head gets which causes the explosions. trust me, I have tried every combination of stock vs. metal parts, new parts ect.......the one thing that fixed it was stiffening the damening considerably. I hope this helps. Mine has exploded 5 times and this is what I found.
11-12-2008 04:59 AM
 
 
fenderstrat
Elite Veteran
Location: Aston,Pa

soft dampers will allow boom strikes,especially when running a lot of cyclic throw,and lots of collective

PerformancePlusRC field rep
COMPASS helis field rep
Mini Titan/SE
HBK2
Futaba FASST
11-12-2008 05:41 AM
 
 
helicraze
Key Veteran
Location: Victoria - Australia

Mine exploded while descending in hover

Logo 700 X 2
11-12-2008 08:30 PM
 
 
Gam
Senior Heliman
Location: Australia

Happened again!!!!!!!!!!!!!

Occured again today. Not very happy about it.

Setup:
Mini Titan - Stock.
Sonix head
Ace links / balls - not reamed!
MT SE Motor with 13T pinion
Ace Hardened Shaft (two flights old!)
Approx 3000 rpm
SE Paddles and Flybar

As you can see from the attached pictures, the shaft broke apart in mid flight. I was watching it, in a stable hover, and the head just let go. Blades and head went one way, the heli went straight down. No boom strike or anything, head just flew off in a straight hover.



This is unacceptable, dangerous, and beyond a joke. I'm done $#%*ing around this this heli! Time to buy something that works 'out of the box', as advertised. I especially feel sorry for you guys who have had this occur with a brand new MT SE. Mine is a mix of other brand parts - well actually only the Sonix head, so one could 'blame' it on that, although the head seems to be the only consistant part that survives and is always balanced.

ACES needs to do somehting about this. I for one am absolutely disgusted and moving on. I salute your tenacity Vinceso31 for trying this FIVE times before finding a 'fix'.
11-28-2008 09:32 PM
 
 
TMoore
rrProfessor
Location: Cookeville, TN

I've never had an MT explode and have hundreds of flights on them but I don't use the hardened shafts.

TM

Buying tools is half of the equation, knowing how to use them is the other. - T Moore
11-28-2008 10:24 PM
HOMEPAGE  
 
 
fenderstrat
Elite Veteran
Location: Aston,Pa

thats whats weird, I have around 1800 flights on mine,and it still flies awesome

what shafts are you using?maybe there is a bad batch going around

PerformancePlusRC field rep
COMPASS helis field rep
Mini Titan/SE
HBK2
Futaba FASST
11-28-2008 11:58 PM
 
 
Leavin
Heliman
Location: Australia

Vince after reading your post I considered your Stiff damping statement. (Totally agree with)
Then while building the heli with a new SE Round machined head, I found a very simple "Issue" the std soft rubber dampers fit into the headblock very loose! new dampers and new feathering shaft, Hmmm then went through the spares box, then I found some new urethane harder dampers I am sure these are TT dampers. (bigger OD than the std soft rubber ones)
So I fitted these new dampers and fitted two shims to the head.
Nice now.

The only other things I have found are
1: Me being lazy fitting paddles to the flybar then centering the paddles to the cage. NOW I fit the flybar, equalize lengths, then fit the paddles and set paddles same distance to the cage.
2.The cheap blades ($20 AUD)dont seem to track that well (uneven link lengths)then when flying at different head speeds you get the shakes...
These points are where most of the problem to the bent shafts, exploding heads... Esp at close to 0deg pitch as some of the guys are experiencing. (Me incluided)

Cheers
Gavin
11-30-2008 01:07 PM
 
 
Gam
Senior Heliman
Location: Australia

Gavin,
what part number / where did you get the dampers that you used?

I have been using the Sonix head, with the dampers that came with it (black ones). The spindle shaft slides through very easily when you put it together, but the sampers are actually quite hard.

I'm currently in the process of putting my old plastic head back on, with its original dampers (PV0706), but using the CNC upper micing arms of the Sonix head for tracking.

What part # does the SE use for the dampers??

I wish I had used cheap blades on my last flight. Instead I had a brand new set of Curtis Youngblood CF on it - two flights old, and now in many bits
11-30-2008 08:07 PM
 
 
Leavin
Heliman
Location: Australia

Yer, Gam the part number is the same as the original MT. PV0706, I have also just purchased a new MT SE head and it came with the softer rubber dampers... Bugger me.. fit in the hub loose as. OK so you will need to fit some shims in the head. to stiffen the damping..

I get most my parts from Brian at Perth RC. I have also got the Sonix head assy and metal Tail from Toby @ TOAL.

Cheers
Gavin
12-01-2008 10:49 AM
 
 
Gam
Senior Heliman
Location: Australia

Back in the Air..........

Well it flies again.

I've put the original head back on with CNC upper mixing arms. First flights this morning, and all seems well. I've got a few hundred flights on this head, so I know it works!

Sorted out tracking etc this morning, so now its time to enjoy some hovering! Tail is working well - so now just wait and see if problems are gone.
12-05-2008 08:45 PM
 
 
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e-Thunder Tiger Raptor E Series > E325 Explodes in Mid Air
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