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HelicopterAerial Photography and Video › Crassssshhhhhed
11-13-2005 01:18 AM  12 years agoPost 1
tech1

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Mississauga

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You always hope it won't happen.

After my last teardown the Raptor has been flying great. Everything has been nice and stable in flight. I even went out for photo's on a windy day and the heli did not disappoint.

I was taking shots of a mall from an empty field across the street. Lots of room but I never figured I would need it.

Half way through the flight something broke and the heli began to pirouette. It was only about 50 feet up and fighting to keep level but resisting to hit the throttle hold because there was no head speed.
Finally I hit the switch but the heli was still rotating as it touched down.


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11-13-2005 01:29 AM  12 years agoPost 2
xcellgasman101

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WOODWARD, OKLA....

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OUCH.... did the camera survive?? Sorry about your loss..
If it didn't stop rotating, then something with the tail must have keep'ed pitch in the blades, thus causing it to keep piroetting,,,
You did give it neg pitch after hitting throttle hold?? XGM

John Crotts
www.soonerhelicamproductions.com

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11-13-2005 01:29 AM  12 years agoPost 3
Naomi

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Ontario, Canada

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Bummer.. hate to see when that happened.. How's the camera and the mount? Hope they're alright. What caused the loss of tail ? servo?

Naomi

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11-13-2005 02:25 AM  12 years agoPost 4
tech1

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Mississauga

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Thanks, I know I will be replaying this one for days trying to figure out how I could have saved it.

The Airfoil mount is one tough cookie. One of the lower skids is bent but the rest looks OK. The heli skids snapped off when they seperated from the mount.
The camera is fine. Thank goodness because the hooby shop doesn't carry camera parts.


Found the culprit. The rudder pushrod snapped at the threads....again.

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11-13-2005 02:28 AM  12 years agoPost 5
mwp

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Chatham, Ontario, Canada

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Oh No!

Sorry to see you went down tech1.

Mark

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11-13-2005 02:58 AM  12 years agoPost 6
ReadyHeli

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Jupiter, FL

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err. that stinks. sorry for your temporary loss.

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11-13-2005 04:08 AM  12 years agoPost 7
fitenfyr

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Port Orchard, Washington

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Probably not much....

Thanks, I know I will be replaying this one for days trying to figure out how I could have saved it.
Hey don't feel bad. There was probably nothing you could have done to prevent the boom strike.
The weight and the high CG spell disaster for an auto with these things.
I have had to auto 3 times now with my camera ships.
Twice with my Fury after flameouts and then once with the Ion.
2 out of 3 looked just like yours.

The last auto was from the 50' or so range and it was much worse than yours and I DIDN'T loose the tail.

There is just too much weight under your average AP ship IMO to manage a decent auto without sliding it in or only being a few feet off the deck when you hit the switch.

The important part is that you were able to guide it away from anything before the abrupt landing.
That to me is the most important part. The gear can be fixed.

Jason Stiffey
Fly Fast....Live Slow...

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11-14-2005 05:55 PM  12 years agoPost 8
tech1

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Mississauga

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Looks like this has been a busy weekend for mishaps.

I will be ready to fly again for next weekend, but the tail pushrod issue is really getting under my skin. I have cracked 2 types of pushrods in the same place. I am thinking of going back to the stock setup.

You can see from my second posted photo where the pushrod from the rudder servo is broken.

The camera survived. Thats what counts.

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11-14-2005 06:42 PM  12 years agoPost 9
aambrose

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Pana, IL

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Maybe I missed something in the thread, but how can you tell the TR pushrod failed prior to the crash and not because of the crash? I know you said the heli began to pirouette but couldnt that have been caused by something else besides a broken TR pushrod?

I had the TR slider bearing/bushing fail on my Raptor 50 which caused a loss of tail control (luckily at about 10 feet). .....and this was the Mavrikk upgrade. I guess if the slider assembly was intact and the bearing OK, you can rule it out. FYI - went back to the stock assembly.

Just a thought.


Tony

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11-14-2005 11:46 PM  12 years agoPost 10
tech1

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Mississauga

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Good question,

I have had the TR pushrod snap 2 other times in the same area. One of those times was exactly in the same place (the threads) but it resulted in a botched auto where the back end of the rod was never found. The other time I auto'd with no damage to the heli. When I landed I found...........a broken rod.

It has been a few months and I thought the new rod had solved the problem.

I have thought about my gyro settings or the gyro itself as being the problem. Something I am doing or using is creating some nasty gremlins.

Any suggestions will be appreciated.

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11-15-2005 12:30 AM  12 years agoPost 11
aambrose

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Pana, IL

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Are you using any exhaust diverters/extensions to get the exhaust away from your camera gear?


Tony

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11-15-2005 12:31 PM  12 years agoPost 12
tech1

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Mississauga

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Up until this weekend I was just using a stock airplane diverter and plastic film wrap over the camera and gear to protect everything from the oil. I was still spending a lot of time on cleanup after flying.

I just started using a tube to extend the exhaust down to the bottom of the camera mount. This was working very well. No noticeable loss of power. The mount and camera were cleaner after each flight.

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11-15-2005 02:38 PM  12 years agoPost 13
aambrose

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Pana, IL

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Any metal-to-metal contact involved in your extension? This created breif lockouts for me on my Raptor 50. I removed the extension and it has never done it again.


Tony

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11-16-2005 12:03 AM  12 years agoPost 14
tech1

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Mississauga

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The solicone diverter sits in between the muffler and extension. No chance for metal to metal.

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11-16-2005 02:08 PM  12 years agoPost 15
aambrose

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Pana, IL

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OK.
I had a silicone diverter between mine too but the metals touched inside the coupler and caused nasty problems.


Tony

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11-17-2005 02:47 AM  12 years agoPost 16
groundeffect

rrKey Veteran

Canada

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Hey Eric, sorry to hear about the crash, glad nobody was hurt!


Cheers,
Dean

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11-17-2005 01:02 PM  12 years agoPost 17
tech1

rrVeteran

Mississauga

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Thanks Dean,

It was just my feelings!


Hi Tony,

The pipes don't overlap in my case. There is about 2 inches from the end of the muffler to the aluminum extensoin pipe. The extension is also isolated at each joint by rubber pads.

I think my gyro/servo setup has too much travel. It must be stressing the rod. Over time it breaks at the weakest point.... the threads.

Both other crashes were during aerobatics. This one was with the camera but in fairly strong crosswinds.
At some points my rudder input and the heading hold correction added together the tail must have been maxing out............. Is this possible?? If the servo keeps pushing then the system loads up.

Any suggestions would be welcome.

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