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Old 02-19-2012, 08:57 PM   #21 (permalink)
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That sucks so bad.. I just watched the video of yesterday's x7 flight on the who flew this weekend thread..
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Old 02-19-2012, 09:01 PM   #22 (permalink)
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Default metal horns

I don't Like metal horns there has to be a breaking point somewhere And I don't want to trash my servos
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Old 02-19-2012, 09:20 PM   #23 (permalink)
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You don't like anything do you Frito....

If you hit the ground something is going to break. Metal horns, plastic horns, you will have more worries then that. I have seen servos trashed with plastic and metal horns. It hard to tell what caused what.
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Old 02-19-2012, 10:12 PM   #24 (permalink)
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i have a set of metal horns on all of my helis, and set has never cost me servo gears in a crash
and i crash alot.
plus the way i see it id like to do everything i can to ensure control all of the way "in". but i crash cheaper servos and helis than frito (in his defense). im just happy to see the really expensive stuff has faired well. makes me feel better about buying one of these. my most expensive heli ive ever crashed was a maxi joker and 2nd most was a 600efl, assuming rob had an "average" crash cost thats almost as cheap as a fusion 50.
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Old 02-19-2012, 10:50 PM   #25 (permalink)
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F50 is WAY cheaper to crash considering the parts from the pictures.



So at 100 mph the frame survived???
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Old 02-19-2012, 11:08 PM   #26 (permalink)
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Not a scratch on the frame, just dirt. Every piece of carbon fiber, bolt, and aluminum is perfect! I wouldn't have believed it myself after seeing a 12mm hardened carbon steel main shaft shearing in half.



I will do metal arms for sure! Because I'd rather chance damaging a servo AFTER a crash, than have an arm break in flight, CAUSING a crash. HAHA.

Just added up parts, we're looking at $415 from what I can see.
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Old 02-20-2012, 12:33 AM   #27 (permalink)
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Quote:
Originally Posted by irishmatt18 View Post
I love the inside hole....
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Old 02-20-2012, 12:35 AM   #28 (permalink)
 

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Quote:
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Not a scratch on the frame, just dirt. Every piece of carbon fiber, bolt, and aluminum is perfect! I wouldn't have believed it myself after seeing a 12mm hardened carbon steel main shaft shearing in half.



I will do metal arms for sure! Because I'd rather chance damaging a servo AFTER a crash, than have an arm break in flight, CAUSING a crash. HAHA.

Just added up parts, we're looking at $415 from what I can see.
Can you list the parts, Rob.

Thank You.
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Old 02-20-2012, 07:06 AM   #29 (permalink)
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ouch Rob very ouch And i thought yesterday's pics were bad. Looks like you saved the best one for the 7

Vas
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Old 02-20-2012, 07:30 AM   #30 (permalink)
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Quote:
Originally Posted by Rob Cherry View Post
Not a scratch on the frame, just dirt. Every piece of carbon fiber, bolt, and aluminum is perfect! I wouldn't have believed it myself after seeing a 12mm hardened carbon steel main shaft shearing in half.



I will do metal arms for sure! Because I'd rather chance damaging a servo AFTER a crash, than have an arm break in flight, CAUSING a crash. HAHA.

Just added up parts, we're looking at $415 from what I can see.
I feel for ya man!

You are running the same servos I am, can you link the metal arms you ordered? I think I am going to swap mine out. I didn't like how much I had to trim off the plastic horns to clear the frames.




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Old 02-20-2012, 10:29 AM   #31 (permalink)
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Quote:
Originally Posted by torana74 View Post
ouch Rob very ouch And i thought yesterday's pics were bad. Looks like you saved the best one for the 7

Vas
I know huh!

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Can you list the parts, Rob.

Thank You.
Will do.

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I feel for ya man!

You are running the same servos I am, can you link the metal arms you ordered? I think I am going to swap mine out. I didn't like how much I had to trim off the plastic horns to clear the frames.
Dave has them, the Futaba/Align servo arms, the blue ones.

I went out to the field today, searched a 300x300ft area. I found more plastic skid parts, a few zip straps, some velcro, some more pieces of the carbon boom supports and the missing servo linkage, fully intact. Still missing the other main pushrod. Oh well.

I walked it off, the main frame landed 140 feet from the impact point, the rest of the parts were within a 200x200 foot area, scattered everywhere.

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Old 02-20-2012, 12:02 PM   #32 (permalink)
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Sweet thanks, putting together an order now.

I will say this, I think we can put the argument of frame CF quality to bed... That bird went in hard!
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Old 02-20-2012, 12:50 PM   #33 (permalink)
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Default 140feet

140 feet any video that had to be spectacular.
Have you figured out what happened? Was it a servo horn i'd rather not use metal but if it may help avoid $400+ worth of damage.
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Old 02-20-2012, 03:53 PM   #34 (permalink)
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I have some thoughts on this. I think the weak link in the head may be the links between the swash and the main grips. Yes, they are 3mm, but look at how they are machined. It's a sharp cut from the shaft OD down to 3mm threads. Really, this should taper a bit to reduce the stress concentration. Because of this I suspect that the rods supplied with the kit are actually weaker than straight 3mm rod.

Take a look at how these are machined:

http://pics.towerhobbies.com/imagel/l/llnsc1564.jpg

Notice the taper before the threads?

I've thought about chucking up my links in my lathe and cutting a fillet in them to re-leave the stress zone, as long as I'm doing that, I might as well make new links, just need to get a 3mm lr and rh die since I'm not set up to cut threads that small.

Also, I think that the 2mm rod between the servos and swash are a little light. I plan to replace mine with quickuk rod ends and these:

http://www3.towerhobbies.com/cgi-bin...?&I=LXNTZ8&P=7

They are a little longer, but I will cut them down a little bit to make them fit. They are light weight (ti) and are WAY stronger than what is shipped with the kit. They are 4-40 which is about 2.8mm which is much stronger than the 2mm stock rods.

schu
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Old 02-20-2012, 04:12 PM   #35 (permalink)
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I doubt that, the one pushrod I have recovered, is actually bent. the stress was so great, it didn't break the linkage or the pushrod, but bent the threads on the pushrod.

Remember, JC has been pounding the snot out of this thing for a year. The only thing missing from his tests were the the extreme cold temps.

Seriously, I wouldn't start changing things on this heli based on opinion. For me, this crash was 100% caused by the cold temps. Whether a linkage or servo arm broke, one of them broke from the temp. Could have happened to any heli. DONE.

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Old 02-20-2012, 05:08 PM   #36 (permalink)
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So the only thing missing that may have failed is the pitch link?
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Old 02-20-2012, 05:22 PM   #37 (permalink)
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How cold was it? I live in Alaska, so mine will be flown in the cold, so I would like to replace whatever failed. After seeing that picture I suspect it was the servo arms. You can't cut them down without some sharp edges unless you used a grinder.

I'll get some metal arms coming. Any suggestions on which to get?
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Old 02-20-2012, 05:44 PM   #38 (permalink)
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Get the Align/JR ones. The blue ones are in stock at anythingheli.com
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Old 02-20-2012, 06:23 PM   #39 (permalink)
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hey rob, did the bend happen at the swash side or the grip side? also jc told me that hes run his at 2700 hs for a bit and nothing let go "it flew like a 3s x2 but louder". good enough for me. jeeze im happy at 2300.
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Old 02-20-2012, 06:57 PM   #40 (permalink)
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The bend is on the upper side, at the grips. I put the hole in the pushrods at the top on both pushrods.

It was 40 degrees F. I'm not going to run 2450 anymore, I fly it like a 450, so I'm going back down to 2300.
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