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HomeAircraftHelicopterHelicopter Main Discussion › What not to do with wood blades..
04-03-2009 04:21 AM  9 years agoPost 1
Briliu

rrApprentice

Rome, NY

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Fly without knowing your head speed

On my 4th flight today (20th since buying my TREX!) I finally got the motor dialed in as good as my inexperienced ear/eye can. I was also playing with my throttle and pitch curves because I was getting some bogging when pulling out of stall turns in normal mode.

Anyway... At the end of my flight I like to just hover and practice orientation for a minute or so. Just as I was settling down to land the engine started to rev up because I was very low on fuel, I got a little jittery and lifted up to approach again under more control. The wind decided to pick up at this moment so I took just a few more seconds to settle down. The engine kept revving higher...

Two feet off the ground I hear a loud *POP* and see the blades fly off to either side of me and the helicopter drop to the ground. I hit throttle hold as fast as I could and then ran over and pinched off the fuel line.

So that was my first crash! haha

Damage list:
Main shaft (Bent just above top bearing, holy crap..)
All main shaft bearings
Clutch bearing (I didnt even think this was in the path of destruction, the main shaft must have REALLY moved to ruin this bearing)
Blades (duh!)
Tail boom
Tail control rod
Tail blades
Flybar

So far, that's all I found! I'm planning on tearing the head apart to check the spindle shaft and to lube it up again.

To prevent this I'm planning on hooking up my Align Governor (I had it off while I was tuning the engine) because I apparently fail at throttle curves :P

I'm also thinking to move to carbon blades? I haven't "regularly" crashed yet, but I'm wary of breaking a set of $90 (?) blades vs my $35 wood ones lol. Any suggestions?

Was a nice evening of flying though!

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04-03-2009 04:30 AM  9 years agoPost 2
TaleGunner

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Deer Park WA

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sounds like if you would have had a set $90 blades you would still be airborne

CRASH! GLUE! REPEAT!
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04-03-2009 04:51 AM  9 years agoPost 3
BJames111

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San Diego, California

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Any suggestions
two actually. 1. Get some cheap carbon blades, they're as low as $55 pm me if you want to know where.
2. get a governor and or a tach.

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04-03-2009 05:01 AM  9 years agoPost 4
RayoVac

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raptor4ever is a THIEF!!!

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I crash my 450 almost every time I fly. I run woodies on it, but on my 600N I sprung for the Radix blades, to avoid they very issue you just experienced.

I can stomach repairs on the 450 due to cheap materials, on the 600N, if it goes into the dirt its gonna be because of my stupid thumbs (or at least as much of it that I have control over).

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04-03-2009 05:03 AM  9 years agoPost 5
Cowjock

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Pa.

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Did you by chance not take the covering off the root of the blades before gluing the blade holders on? It looks like the covering was still on. I flew woodies for a long time on my raptor and never had a set do that. Actually learned loops and rolls with them. You would probably do well with a set of fiber glass ones. Heliproz use to carry them, very good for what you are doing.

Damn that ground is hard! When's the right time to get out of this money sucking hobby?

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04-03-2009 05:06 AM  9 years agoPost 6
captrlp

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Spanish Fork, Utah - USA

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What not to do with wood blades......? The answer is: Fly

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04-03-2009 05:12 AM  9 years agoPost 7
Cowjock

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Pa.

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Oh come on now, a lot of guys learned to fly on woodies.

Damn that ground is hard! When's the right time to get out of this money sucking hobby?

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04-03-2009 05:13 AM  9 years agoPost 8
Briliu

rrApprentice

Rome, NY

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I did take it off, when I did it I think I misunderstood the intent, I left a little under the plastic edge and glued the wood part to the plastic grip. I'll be moving to carbons now though! But I get the idea of gluing the WHOLE plastic piece to the wood so its more than just the 3 holes holding it on!
2. get a governor and or a tach.
Hooking one up before I fly again for sure!

I just ordered two of everything that broke, so I wont be out of the air nearly as long next time :P Yeah.. Im addicted lol

Honestly, it was pretty funny Scary for a few seconds, but I laughed afterwords :P Hope you guys got a kick out of it too!

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04-03-2009 05:22 AM  9 years agoPost 9
oldfart

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Vancouver, Canada

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Just as I was settling down to land the engine started to rev up because I was very low on fuel
and then it revs up even more!!
.....took just a few more seconds to settle down. The engine kept revving higher...
Maybe your woodies would have lasted very well if you had not set your engine so lean, that it started to over rev when unloading at low tank. I would also bet that your hover set-up was set to be too high (hense the sound of bogging under heavier loading) as your motor was maybe trying to keep it at too high a rotor speed to begine with.

If you keep your 600 woodies below 1800, and glue the cuffs to the wood I would bet this would not have happened, even after 500 flights!!

Of course that is assuming the woodies were not flawed or the cuffs designed so that the screws are located the same distance in from the leading edge or along the line in the wood grain or where two of the different density woods are glued together.

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04-03-2009 05:22 AM  9 years agoPost 10
RayoVac

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raptor4ever is a THIEF!!!

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Well I try not to laugh at anothers expense... but since I have your permission!!!

Not as bad, but similar... one of the guys I fly with tried out some heavy fiberglass blades I got on ebay. He is a very good pilot and runs a pretty high head speed on his mini titan (all plastic head).

We were flying in a college gym over the winter, he spooled it up... got it into a hover, switch into idle up... KAAAABOOOOM... the thing just exploded. It was FRICKEN AWESOME!!! The main shaft bent at near a 45 degree angle. It was almost a total loss, servos stripped, shafts, linkages all kinds of stuff, it was an explosion of parts all over the gym.

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04-03-2009 05:26 AM  9 years agoPost 11
Cope

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South Lake Tahoe CA

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The more I look at your pick I believe CowJock is 100% right. You improperly secured the support to the root and at high head speed the grain of the wood simply could not "hold on".

The real question is would this have happened with properly set up blades running at excesive head speed?

There was another case of this recently, In that case the support was not epoxyed to the root and the failure was quite simalar. Folks in that thread responded that they run head speed higher than recomended with no problem.

In your pick I can see lots of plastic under the support. Please describe the method you used to attach the support to the root.

Fear is the little death,The mind killer. I will allow my fear to pass through me.Only I will remain

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04-03-2009 05:49 AM  9 years agoPost 12
fenderstrat

rrProfessor

Aston,Pa

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if the plastic blade roots weren't secured properly wouln't the plastic have come off WITHOUT any wood in it?it looks to me like there is a significant ammount of wood still in the roots.it seems like a case of exceeding the rpm limits of the woodies,

if you look at the root on the right there is a lot of wood still there

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04-03-2009 07:53 AM  9 years agoPost 13
30636086

rrKey Veteran

Tacoma, WA

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That sucks!
Oh come on now, a lot of guys learned to fly on woodies.
Yup; I did, but in a 450!
if the plastic blade roots weren't secured properly wouln't the plastic have come off WITHOUT any wood in it?it looks to me like there is a significant ammount of wood still in the roots.it seems like a case of exceeding the rpm limits of the woodies,

if you look at the root on the right there is a lot of wood still there
+1

I dont suffer from mental iIlness, I actually enjoy mine!

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04-03-2009 11:28 AM  9 years agoPost 14
TOSH

rrElite Veteran

UK.Peterborough

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l`d agree with fenderstrat here, you went way above the safe rpm on those paint stirers.
To prevent this I'm planning on hooking up my Align Governor (I had it off while I was tuning the engine) because I apparently fail at throttle curves :P
You can just as easily tune an engine with a govenor on, l`ve been doing it for years.
but I'm wary of breaking a set of $90 (?) blades vs my $35 wood ones lol.
Looks like your wood blades cost a lot more that $35.00.

$35.00 plus

Main shaft (Bent just above top bearing, holy crap..)
All main shaft bearings
Clutch bearing (I didnt even think this was in the path of destruction, the main shaft must have REALLY moved to ruin this bearing)
Blades (duh!)
Tail boom
Tail control rod
Tail blades
Flybar

and a few hours of down time

Flybars. Who needs `em.

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04-03-2009 11:34 AM  9 years agoPost 15
MartyH

rrProfessor

USA

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Other than my very initial practice on my first 50, I have never liked wood blades. Sure they can work for some but the quality varies so widely and they can be tempermental to humidity and warping plus they require maintenance on the covering. Spring for even sport carbon blades and put all that behind you.

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04-03-2009 11:37 AM  9 years agoPost 16
brgsstm

rrApprentice

Cheshire, U.K.

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I would never run woodies on anything bigger than a 30

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04-03-2009 11:47 AM  9 years agoPost 17
TOSH

rrElite Veteran

UK.Peterborough

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brgsstm
Yup l would run them on a nitro 30 but thats it. Once you`ve seen them leave the heli carbons are a must.

Flybars. Who needs `em.

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04-03-2009 12:00 PM  9 years agoPost 18
bosshoss

rrVeteran

Chicago, IL

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Live and learn, and in this case , thankfully you are not injured or dead, so the lesson might stick.

No problem at all with woodies on a 50 , flown within their envelope. No doubt looping and rolling broke-loosened up the junctions, the severe wind up finished them off.

I still have my original woodies, on a shelf.

Why Hover a Yak, when a Heli does it better?

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04-03-2009 12:13 PM  9 years agoPost 19
TOSH

rrElite Veteran

UK.Peterborough

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bosshoss
No problem at all with woodies on a 50 , flown within their envelope.
Fair enough but when l said l`d fly them on a 30 l ment l fly the the same as carbons. lf we`re talking about detuning a heli to the point where you can`t break a wood blade then yes, use them on your 90 but what would be the point?

Flybars. Who needs `em.

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04-03-2009 01:07 PM  9 years agoPost 20
w.pasman

rrElite Veteran

Netherlands

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Did you GLUE the blade roots to the wood?
Two feet off the ground I hear a loud *POP* and see the blades fly off to either side of me and the helicopter drop to the ground. I hit throttle hold as fast as I could and then ran over and pinched off the fuel line.
Do you realize what would have happened if the blades hit you?

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HomeAircraftHelicopterHelicopter Main Discussion › What not to do with wood blades..
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