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HelicopterGasser Model RC HelicoptersOther › Radikal down
01-01-2010 07:19 PM  7 years agoPost 1
rccarguy

rrVeteran

Boston MA

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This wasn't the way I wanted to start out the new year! Weather looked good this morning and I just finished changing the Radikal over to 6.9 gearing, time for a trip to the field.

To make a long story short, I had just fired up the Radikal and was in the process of tweaking the rev limiter settings for the changed gearing. Made some adjustments in the DX7 and lifted off to test it out, about 10 feet in the air just as I started FF I heard a pop like the sound a lightbulb makes when it implodes and before I could even blink the Radikal was on the ground, HARD...

Something broke, no doubt of that, what I haven't fully figured out yet, but I have a hunch. One of the radius arms is missing along with the collective linkage for one of the blades. The other radius arm is still attached to the washout arm and broken off at the swash end. It appears that what happend was it threw the pin holding the radius to the washout arm which then swung outward and took the collective linkage off resulting in full negative pitch on one blade, down it went. Fortunately it wasn't very high up, it slammed down more or less upright so the main blades and head were spared any damage beyond the missing linkages.

Haven't completely assessed the damage, so far things I know of...
landing gear
lower frame/engine mount
left rear main frame
radius arms
linkages
carbon fiber tail blades
dented muffler

Time to start making a list and poking deeper to see if there's any not so obvious damage.

On the plus side I've finally manged to exorcise the gremlins from the Spectra G and it flew the best it has since I got it, did 3 tanks of fuel before packing up and heading home.

XCell Spectra G
Radikal G20
Some obsolete nitro helis too...

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01-01-2010 07:49 PM  7 years agoPost 2
Sean Bosse

rrApprentice

Germantown, MD.

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Sorry to here that. Keep us informed as to what the cause was.

Sean

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01-01-2010 07:59 PM  7 years agoPost 3
rccarguy

rrVeteran

Boston MA

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Sorry to here that. Keep us informed as to what the cause was.
A case of owner/builder brain fart is the cause. At the same time I did the gearing change I swapped the plastic washout assembly for the all alloy one. There are drilled and tapped holes in the washout arms to lock the pins with a set screw, but no set screws were supplied with the arms. I had made a mental note to dig some up and install them but with New Years and other things on my mind, I never did apparently...

Raja called just as I was looking the Radikal over to see what's damaged. During the conversation I noticed the pin for the other arm was sticking out, then I put my glasses on and looked closer and sure enough, no set screw

XCell Spectra G
Radikal G20
Some obsolete nitro helis too...

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01-01-2010 08:44 PM  7 years agoPost 4
Sean Bosse

rrApprentice

Germantown, MD.

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That sucks, well maybe it can be a time for upgrades.
Sean

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01-01-2010 08:52 PM  7 years agoPost 5
marc28

rrVeteran

new york

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I always feel better when I dicover what caused a crash...even when I make a mistake

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01-01-2010 09:37 PM  7 years agoPost 6
Helizrule

rrVeteran

Lake Ariel, PA

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Sorry to hear of your loss. I know how easy it is to get distracted while working on any machine. I keep a scratch pad handy and constantly make notes to myself of ALL the issues that need to be addressed prior to flight. I get to many distractions such as the phone my dog or the wife lol.

One mile of road will take you one mile. One mile of runway will take you anywhere in the world.

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01-02-2010 03:25 AM  7 years agoPost 7
crash n' burn99

rrApprentice

ottawa, canada

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OHHH SH%T i ALMOST DID THE EXACT SAME THING WHEN i WAS PUTTING THE ALUMINUM HEAD ON MINE.

I feel terrible for you, I would gladly help you rebuild if I wasnt so far away.

Hurry up and get that thing back in the air!

Do proctologists chew there finger nails when there nervouse?

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01-02-2010 02:30 PM  7 years agoPost 8
AceBird

rrElite Veteran

Utica, NY USA

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A case of owner/builder brain fart is the cause.
The good side is this will never happen to you again. Anybody can preach "check all the screws" but it really sinks in when you have a loss like this.

Don't look back, look forward to many happy flights.

Ace
What could be more fun?

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01-02-2010 07:23 PM  7 years agoPost 9
rbort

rrProfessor

Franklin, MA - USA

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Sorry to hear that

With the lack of circlips at the ends on the stock parts, it may be a good idea to take them apart and put some CA in the ends so that they won't budge.

The rear A-arm pin came out half way on me and I was luckily I didn't crash. I discovered it back on the bench when I was looking over the model. Its CA'd now.

-=>Raja.

MA 1005 Hanson 280, 4129 flts
Spectra 27 3DMax, 3187 flts
Whiplash V1 Hanson 300, 1425 flts
Whiplash V2 Hanson 300, 185 flts

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01-02-2010 09:36 PM  7 years agoPost 10
smallplanes

rrElite Veteran

S.C. ,SSA

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You might be able to take a sharp point of a tap and put a few dings in the shaft and then put some ca on the shaft and put it in and let it dry. Just and idea. Sorry about that i know how you feel.

Thanks and sorry


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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