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HomeAircraftHelicopterHIROBOOther › Main Blade Bolts
10-13-2005 05:48 PM  12 years agoPost 1
KenHeli

rrNovice

Downey, CA.

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Hello all,

My main blade BOLTS keep getting bent.

Do I need stronger set of bolts? Or just order another set?

I noticed this(stock bolts) after a recent crash,
and ordered a set(turned out to be aftermarketish...) from Heli***z.
After some flights I inspected the new bolts and they got bent again.

A good friend tapped them straight on a concrete surface. So I flew
a few more and came home. I found them bent again at home while
cleaning my heli.


Only thing I can think of is that I DO autos...but compared to other
guys of my level, I don't hard-land my heli.
I'm not doing any 3D now since I'm barely started doing some
entry level aerobatics.


Oh what I'm flying:
EVO 50
TT 600mm mains
Appr. 1850rpm at Stunt 1 Flight mode

Any input'd be helpful.

+++Ken KIN Heli+++

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10-13-2005 06:40 PM  12 years agoPost 2
Eury

rrProfessor

Dover NH

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Are you sure you are at 1850? I've always thought that it was high headspeeds that caused blade bolts to bend. I have yet to have a set on my Evo bend, and I'm running the exact same config as you, at 1900RPM headspeed governed.

Nick Crego

Citizen #0168

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10-13-2005 07:12 PM  12 years agoPost 3
Donkey

rrApprentice

Punta Gorda, FL

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For your own safety I would not recommend running bolts that have been straightened. These are hardened bolts and they will let go after being straightened. I think you need to look at your blade grips or blades. I would have to bet you have a hairline fracture on one of your blade grips. I have exceeded 2300 on my evo head and never bent a blade bolt. The evo starts shaking itself to pieces long before the bolt fails (I know I lost a governor sensor)

Donkey you have the right to remain silent what you lack is the capability

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10-13-2005 08:00 PM  12 years agoPost 4
KenHeli

rrNovice

Downey, CA.

My Posts: All  Forum  Topic

Thanks
Great,

Oh, well even though I really never tached my RPM, it
didn't sound like more than 1900. I don't like high RPM and
other guys run at higher RPM with no problem.
This weekend I'll have to ask other friends with tach to help me check
my RPM to make sure.

I forgot to mention I'm running TJ Pro and I think the value
is for around 1800rpm.

And for the grips, I didn't check carefully for any cracks so
I'll do that tonight.
I got new spare grips a long time ago and have been looking
for the right time to use them. Think it's time now for new grips
and bolts.

Thanks for the advice.

+++Ken KIN Heli+++

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10-14-2005 01:34 PM  12 years agoPost 5
929pilot

rrApprentice

Jackson, OH

My Posts: All  Forum  Topic

I had the same problem. Order a set of Freya bolts, they are made of a different alloy and they don't bend!

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10-14-2005 01:56 PM  12 years agoPost 6
Professor Fate

rrKey Veteran

Goose Creek S.C.

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Damn you must have one heck of an ear. You would be suprised at what you'll find with a tach. Even a cheap photocell tech is better then nothing.

Welcome my son, Welcome to the machine

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10-14-2005 04:44 PM  12 years agoPost 7
KenHeli

rrNovice

Downey, CA.

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LOL
Yes, I have one heck of an eye too.
A good friend's just bought a new tach so I can take advantage of it.

Last night inspection didn't find any damage on the grips...
I'll try out the Freya bolts as suggested.

Thanks for the input.

+++Ken KIN Heli+++

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10-15-2005 04:29 AM  12 years agoPost 8
dkshema

rrMaster

Cedar Rapids, IA

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I've flown a lot of different helis in the last 30 years. And among other helis, I currently own an EVO50 and Freya.

Bent blade retaining bolts has never been a problem here, even after some real bad crashes. It's not a common problem.

Dave

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10-15-2005 08:14 AM  12 years agoPost 9
jkelly

rrVeteran

Bedford, PA

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Can we see a picture of these bolts?

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10-15-2005 01:57 PM  12 years agoPost 10
Jeff H

rrKey Veteran

Cincinnati, OH

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Bent blade retaining bolts has never been a problem here, even after some real bad crashes. It's not a common problem.
Sure it is. Its just not a commonly looked at problem.

I'm willing to bet that everyone who has an evo in this thread has bent bolts. Everyone. Take tham out and roll them on a piece of glass...

Its not a real problem and doesn't really affect performance so most people don't even look for them. I flew with a set that was pretty bad before I finally got the Eagle fully shanked bolts.


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10-15-2005 06:02 PM  12 years agoPost 11
dkshema

rrMaster

Cedar Rapids, IA

My Posts: All  Forum  Topic

I'm willing to bet that everyone who has an evo in this thread has bent bolts.
I do.

They aren't.

I think you lost your bet.

Dave

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10-16-2005 02:54 PM  12 years agoPost 12
929pilot

rrApprentice

Jackson, OH

My Posts: All  Forum  Topic

It's not very noticeable like a banana, but they can bend. Just because yours never did or you didn't notice doesn't mean it can't happen. Mine did in fact bend and not because of a crash. Could be some substandard bolts found their way into some kits. Only one of mine was bent, the other was fine, I can't explain that either but it happened.

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10-16-2005 09:40 PM  12 years agoPost 13
Jeff H

rrKey Veteran

Cincinnati, OH

My Posts: All  Forum  Topic

I do.

They aren't.

I think you lost your bet.
take them out, roll them on glass and report back. Unless you're running less than 1800 and just hovering, you've got at least a slight bend in them. I haven't lost the bet yet


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10-17-2005 02:35 AM  12 years agoPost 14
Ace Dude

rrProfessor

USA

My Posts: All  Forum  Topic

take them out, roll them on glass and report back. Unless you're running less than 1800 and just hovering, you've got at least a slight bend in them. I haven't lost the bet yet
Time to pay up, I've never had a set of bent bolts either.

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10-17-2005 12:54 PM  12 years agoPost 15
dkshema

rrMaster

Cedar Rapids, IA

My Posts: All  Forum  Topic

A couple of people have bolt problems, and that is absolute proof that ALL of us have the problem. In spite of us who don't saying so.

Some people just can't accept reality unless it is their version.

Bolts are straight here. Two years old, and I'm turning 1850 RPM consistently.

Dave

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10-17-2005 05:10 PM  12 years agoPost 16
Jeff H

rrKey Veteran

Cincinnati, OH

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Some people just can't accept reality unless it is their version.
Some people never miss the opportunity to insult others.

Whatever,
of the 4 Evos we have had at the field in the last 2 years, every one had bent bolts at some point in its life. We all flew at or above 1900 with fairly agressive manuvers.

Oh, BTW, you never replied that you actually checked the bolts...I never knew mine were bent the first time until I pulled them out to check.


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10-17-2005 05:50 PM  12 years agoPost 17
DS 8717

rrProfessor

Here wishing i was somewhere else

My Posts: All  Forum  Topic

I'm running 1900 and V blades and mine aren't bent yet. They have been through some very hard 3D. I am keeping an eye on them. Mine does have a bent blade axle and hasn't been crashed..yet.

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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10-18-2005 12:13 AM  12 years agoPost 18
KenHeli

rrNovice

Downey, CA.

My Posts: All  Forum  Topic

lol
I ordered a set for Freya as suggested.
2 sets that I have are all bent. I'll try email the picture
for you who asked for a picture post since I'm not allowed
to post pictures.

I just wanted to know if something's wrong or if I'm missing
something that's causing this problem. Dont matter to me
if it's a common thing or not.

Thanks a lot.

+++Ken KIN Heli+++

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10-18-2005 01:17 AM  12 years agoPost 19
dkshema

rrMaster

Cedar Rapids, IA

My Posts: All  Forum  Topic

After having rolled the screws for yet a second time, with an additional two flights in the interim, all I can say is both bolts are still straight. A small bit of rust on them, however. Two years of some serious flying on the same couple of bolts running Mavrikk G4 and G4-Pro CF blades, with headspeed in the neighborhood of 1850-1950 RPM, depending upon who is running the tach at the time.

And not "just hovering", for the record.

These two bolts have also survived two pretty nasty crashes that resulted in the CF blades breaking in multiple places, two bent MR hubs, and two bent spindles.

Apparently a reply simply stating the facts was not acceptable as it didn't fit the premise of the post.

The second post followed, a bit sarcastic, but still stating the facts. This, followed by a post that included the line
...you never replied that you actually checked the bolts
which appears to point out that sarcasm is bad in this thread, but it is totally acceptable to insinuate that people who DON'T share this problem are liars.

Dave

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10-18-2005 01:34 AM  12 years agoPost 20
Ace Dude

rrProfessor

USA

My Posts: All  Forum  Topic

Some people never miss the opportunity to insult others.

Whatever,
of the 4 Evos we have had at the field in the last 2 years, every one had bent bolts at some point in its life. We all flew at or above 1900 with fairly agressive manuvers.
Some people just self inflict their own insults.

Just because 4 Evos at your field have an issue it doesn't mean every heli at every field has the issue.

Are you using the stock bolts? Is everyone else using the stock bolts? What's the length of the shoulder on the bolt? What blades is everyone flying? How much do the blades weigh? Have any of these 4 helis been in a crash?

If you're going to make blanket statements without much data to back it up, you can certainly expect some (well deserved) constructive criticism.

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