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HelicopterBeginners Corner › First crash advice
05-04-2017 07:57 AM  6 months agoPost 1
joshreynolds777

rrApprentice

Willis, Tx

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Was practicing inverted hovering and on the last pack after several models. Went down in the goblin 770. And I know what your thinking. Why the frac was I trying new moves on the big expensive one. I get it. It was Dumb.
In any case. I don't know if my brain went to a didferent time continuum and back or what. But I put it in a couple
Feet of grass from 15 feet up or so. Don't know what happened. I can't seem to duplicate it on the sim. Just went the opposite way on the collective I think.
Anyway. It looks to be a pretty lucky crash. The boom broke away as intended. Blades,
and tail belt trashed. Canopy repairable. The motor slid backwards saving who knows what all parts. Broke the nylon boom bolts obviously. And one ball link.
Everything else seems to be ok.
Everyone is saying go ahead and replace the main shaft. I actually have one already. But while Turing it it's not showing any slight wag at all, is it safe to go ahead and spool
Up and check ?
If it's not bent I'm not sure why I'd replace it.
The tail shaft and feathering shafts "seem" ok too. I don't have a glass table to roll them across. Do these shafts get bent just too slightly to be able to tell ?
The servos feel fine so far although I still need to in link them and power the bird up and see if they are still holding fine.
All the electronics seem fine. Lipos are fine.
I had a spare set of mains already. And the tails were not damaged.
Could I really be lucky enough to have only bought a $38 belt, and some nylon bolts to get this thing flying again ?
Does this kind of thing happen ?
I though going down was gonna cost me big time!
What all should I check and how ?

Thanks guys.

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05-04-2017 12:13 PM  6 months agoPost 2
Dan Minick

rrKey Veteran

Columbus, WI

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Do you have access to a dial indicator? That is the best way to check shafts as many times you will not be able to see a wobble, especially on the tail and feathering shafts.

I would find a way to load test all the servo's. With that big of blade I have a hard time believing it didn't at least strip a gear. I usually remove the links one by one and hold pressure against the servo and see if it will drive and hold where it should.

Team Synergy, Team FBL Rotors-------if its not broke...it will be!

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05-04-2017 12:42 PM  6 months agoPost 3
joshreynolds777

rrApprentice

Willis, Tx

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roger that, I'll be doing a load test on the servos for sure.

as far as the dial indicator, Ive never even heard of one of those.

No clue

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05-04-2017 02:01 PM  6 months agoPost 4
crflyer

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Maine

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Spin the shafts in a drill , you will see very quickly if they are bent. This has worked well for me over the years.

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05-04-2017 08:06 PM  6 months agoPost 5
Pistol Pete

rrProfessor

Seffner, FL

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Or...

Remove head-grips and same for tail hub-grips.

With only the bare shafts left, you can spool it up.

Check to see if it wabbles and also feel for vibrations.

You can also place "lightly" against spinning shaft another metal object such as a long screwdriver perpendiculary and check for a bent shaft. If it's bent, the metal will starts to bounce off it.

Next, lift heli by swash and pitch-pump. This put load on servos. Dont pinch your fingers

~~Enjoying the hobby one flight at a time~~

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05-04-2017 09:35 PM  6 months agoPost 6
joshreynolds777

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Willis, Tx

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Nice ideas guys !!!
That's exactly what I was looking for !!!!

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05-05-2017 12:04 AM  6 months agoPost 7
Dan Minick

rrKey Veteran

Columbus, WI

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Watch this video. If you really want to know if your shafts are bent buy one and forget all the "eyeball" suggestions above. You dont need a milling machine

You dont have to spend a fortune either.
https://www.harborfreight.com/1-inc...icator-623.html

Watch at YouTube

Team Synergy, Team FBL Rotors-------if its not broke...it will be!

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05-05-2017 01:01 AM  6 months agoPost 8
Pistol Pete

rrProfessor

Seffner, FL

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Definitely a nice tool to have and thanks for video.
forget all the "eyeball" suggestions above
Interestingly the lad in video at 4:16 says...you can "see" its bent.

The dial indicator was to let him know how bent it was.

Exactly what he did with "special" tool is what you can do with a small screwdriver you already own.

Same thing he did with a mill, you can do with shafts still mounted to heli and a 3S battery is all you need to power ESC-Motor.

Another "tool-less" option is what he did rolling on a glass table but instead do on a mirror. Shine a light opposite from where you are viewing and let it roll slowly. If bent, light will reflect under.

Also you can hear if bent as the rolling sound is not continuos but interrupted wabble.

~~Enjoying the hobby one flight at a time~~

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05-05-2017 03:32 AM  6 months agoPost 9
Heli Fanatix

rrVeteran

Fountain Valley, CA

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If your blades comes in contact with anything ... CHANGE IT.

If you are the type that likes to hear good news about their bad habits
- keep it and live with uncertainty
- If you want peace of mind, change it and be done with it

- Scott

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05-05-2017 03:37 AM  6 months agoPost 10
ant_mb

rrElite Veteran

United States

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9 years in helis and your first crash? I'd say your were more than due!

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05-05-2017 03:38 AM  6 months agoPost 11
Santiago P

rrProfessor

South West, Ohio

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First crash advice

Don't have one.
Skip to the 3rd or fourth crash, they are usually more fun to talk about.

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05-05-2017 06:42 AM  6 months agoPost 12
joshreynolds777

rrApprentice

Willis, Tx

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well... almost ten years in the hobby, But took about a nine year hiatus lol. First forward flight was just this last February.

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05-05-2017 05:20 PM  6 months agoPost 13
ICUR1-2

rrElite Veteran

Ottawa, Ontario

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this is where buying that second frame comes in handy if you could afford it.

I never had any luck repairing a crashed heli there is always a vibration somewhere or a bearing that got overlooked. I started just replacing the kit once and using the first model for spares.
After the next crash I replace all the bearings and anything that spins
as for testing servos if they're damaged they're gone
nothing worse than crashing because you "took a chance"

My biggest pet peeve in this hobby is crashing due to mechanical or electronic failure. It is such a waste of time and resources..

spending time, paying attention

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05-05-2017 08:09 PM  6 months agoPost 14
Gearhead

rrMaster

Vt

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Was practicing inverted hovering and on the last pack after several models. Went down in the goblin 770
well... almost ten years in the hobby, But took about a nine year hiatus lol. First forward flight was just this last February
well you posted it, and I have seen it a few times, you are pushing yourself too fast, stop the inverted for now and have fun for a while, stick to loops and rolls till you get a good feel of the stick of your Chopper,

one guy (2007), didn't even know how to tune his Idle correctly, didn't even think about his OS91 sounding "Naa naa naa naa naa" at idle,, too-too lean, and would not listen to me, yet I learned back in 1979 what a lean 2St Idle sounded like,, he was out doing ""juddery !!"" flips 5ft of the ground, drove-it head fist right into the dirt,, he couldn't even flip smoothly 30Ft up but here he was 5Ft off the ground,, heard him say "I didn't do that",,,, sure he did, he was the pilot...

for $6 I always replaced my Tail Output Shaft once in a crash

Jim
Buzz Buzz Buzz

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05-05-2017 08:21 PM  6 months agoPost 15
joshreynolds777

rrApprentice

Willis, Tx

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Jim

I've been wondering about that !
I'm glad you said something.
That's been a big question of mine too.
I see these insane advanced pilots and I wonder how fast they had to advance to get to that level and just assumed it would have to be at an amazing pace. So I've been pushing myself pretty hard. That's really nice to hear tho. I believe I'll take
You up on that.
And yep in the tail shaft, I don't think it's bent. But something doesn't quite sound right right it. I bet you guys are right and a bearing got damaged.

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05-06-2017 11:47 PM  6 months agoPost 16
flycatch

rrApprentice

Barstow, California

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You're flying a 770e and this is your first crash? Either you're an exception to the rule or a gifted pilot. That said, repair if possible or buy your self another

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05-07-2017 11:19 AM  6 months agoPost 17
joshreynolds777

rrApprentice

Willis, Tx

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Need some help with this repair fellas.

Flycatch

Thanks for the nice words.
That was a great compliment!
I kinda started off with bigger models.

In any case I do have some others. Of all sizes.

Trying to get this repair done.
Got everything in I thought I needed to order.

Suppose I should have done some more testing a couple days ago.

But was waiting on ball links.

I spooled up before putting the tail on. And everything seemed ok. I tested the shafts for tweaks. And everything checked out.

Once I installed the boom, the motor wouldn't drive the head.

I don't k ow if the one way bearing is out in the pinion gear or what.

Pretty lost.
I guess I'll take it out and have a look.

Your advice is much appreciated.

What should I be looking for. ?

There is also a little upward play when picking up on the head now I've noticed. I dunno if it's always been there or not. But the goblin 700 does not have this play (although it's new)

Thanks.

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05-07-2017 11:59 AM  6 months agoPost 18
joshreynolds777

rrApprentice

Willis, Tx

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Pulley assembly

It appears the 60T pulley assembly (HO104-S)
Isn't turning the Secondary Shaft (H0022-S)

So I guess the one way bearing ?

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05-07-2017 12:25 PM  6 months agoPost 19
Dan Minick

rrKey Veteran

Columbus, WI

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Start at the motor and work your way through the drive line making sure each pinion and pulley are catching on the shaft that they are meant to. The goblin drive has many moving parts and lots of small bolts to break. I dont think I personally have ever had a one way all of a sudden stop working in a crash but I suppose if the motor was driving for a few seconds while it was laying on the ground it could happen.

As for the head play, check the aluminum plates all the gears run on to make sure they are not bent. Many times in a crash the head is driven down and bends the plates.

Team Synergy, Team FBL Rotors-------if its not broke...it will be!

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05-08-2017 05:21 AM  6 months agoPost 20
joshreynolds777

rrApprentice

Willis, Tx

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Got the play out of the main shaft easily. We just loosened the mast collar and snugged it back down and no more play. The crash must have caused it to slip down slightly.

As for the one way bearing in the pulley. The 60T gear.
That thing litterslly reversed itself.
The craziest thing. No, I didn't install it wrong. I never touched it.
I also have a Goblin700 to compare it to.
Even my guru was pretty baffled. He hasn't seen one do that before.
I simply ordered the new part. And should be flying again when that comes in.
Pretty sure I got very lucky.
A $28 pulley/gear
$38 tail belt.
$7 nylon bolts.
$12 for a bunch of ball links.
Already had a spare set of mains.
Repaired my canopy. Repaired the boom.
All the electronics are fine. The shafts are all straight.
Lucked out I think for sure.
I think this gear assembly comes in and I'll be flying again.

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