Crash & Rebuild Post your crash stories, pictures and if you want to document your rebuild you can do that here too!

Ultra sport 60 no more

Reply
Old 07-05-2009, 05:48 PM
  #1
Krener
Thread Starter
 
Join Date: Nov 2006
Location: AS, AUSTRALIA
Posts: 295
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Ultra sport 60 no more

Well, maidened the US 60 yesterday.
Pics speak for themselves.


She flew beautifully for 7 minutes, then I lost elevator.
Tried to put her in as flat as possible but to no avail.
As can be seen in the post crash pics the elevator push rod broke at the thread behind the clevis. I had changed the push rods from the ones I made to Dave Brown items as mine would resonate & flex too much for my liking & the Dave Brown ones seemed fine.
Essentially all I had managed to achieve was instead of the rod flexing, all the vibration was being absorbed by the other components in the rod assembly, & the weakest link failed.

Kinda spewing, 6 months & quite a few dollars down the dunny, not too mention the fibreglass & paint finish that took forever to get right[&o]
Broke the crankcase on the new 75AX dont know if that is worth replacing.
Only the electrical side survived, & the retracts.
Ah well, such is life.
Attached Thumbnails
Click image for larger version

Name:	Zx72590.jpg
Views:	16
Size:	68.2 KB
ID:	1230283   Click image for larger version

Name:	Sn40960.jpg
Views:	13
Size:	68.2 KB
ID:	1230284   Click image for larger version

Name:	Ej13534.jpg
Views:	13
Size:	62.9 KB
ID:	1230285  
Krener is offline  
Reply With Quote
Old 07-05-2009, 08:35 PM
  #2
mustangman177
 
Join Date: Aug 2002
Location: Cisne, IL
Posts: 732
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Ultra sport 60 no more

Sorry for your lose dude. Can't imagine there being that much vibration at the aft end like that to break a clevis. I use Great Planes threaded pushrods, so far no problem.

Don't let this discourage you...Get another plane back in the air and enjoy flying !!!!!
mustangman177 is offline  
Reply With Quote
Old 07-06-2009, 12:36 AM
  #3
Redback
 
Redback's Avatar
 
Join Date: Aug 2004
Location: GraftonNew South Wales, AUSTRALIA
Posts: 1,289
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Ultra sport 60 no more

When you Territorians crash you sure make a job of it!

Sorry for your loss

Terry
Redback is offline  
Reply With Quote
Old 07-06-2009, 01:33 AM
  #4
multicasting
 
multicasting's Avatar
 
Join Date: Sep 2003
Location: Dallas, TX
Posts: 472
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Ultra sport 60 no more


Quote:
ORIGINAL: Krener

She flew beautifully for 7 minutes, then I lost elevator.
Tried to put her in as flat as possible but to no avail.
Dude! No Way! I have been watching the build thread all this time. I loved your paint job. You had said the rods were giving you trouble. I do feel your pain. Two weeks ago I maidened my Top Flite P-47 (Painted, not covered) to similar effect. My mistake was forgetting to range check. I fought an inconsistan radio all the way to the ground. Mine will fly again since I only went in at about a 20 degree angle at 1/3 throttle.

A few days earlier while practicing for an airshow,I lost my old faithful Ultra Stick in a lake. I retreived all but the nose with the YS engine on it. Also an unknownradio issue (different system.) At least I got 5 good years out of it.

What are your plans now?

Bob
multicasting is offline  
Reply With Quote
Old 07-06-2009, 04:06 AM
  #5
Korps
 
Korps's Avatar
 
Join Date: Oct 2008
Location: Wellington, SOUTH AFRICA
Posts: 438
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Ultra sport 60 no more

Sorry for your loss Krener.

Now get another one and GO GO GO! :P
Korps is offline  
Reply With Quote
Old 07-06-2009, 04:22 AM
  #6
Krener
Thread Starter
 
Join Date: Nov 2006
Location: AS, AUSTRALIA
Posts: 295
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Ultra sport 60 no more


Quote:
ORIGINAL: Redback

When you Territorians crash you sure make a job of it!

Sorry for your loss

Terry
Yeah, I was quite impressed by the carnage.
I mounted the engine with the exhaust down with the logic being, if the retacts folded on a landing the exhaust would save most of the underbelly from severe gravel rash.
Unfortunately when she went in, the exhaust hit hard & ripped itself off the crankcase & wiped out the bottom nose section, but not before snapping the engine mounts.
The firewall was still intact, didn't budge an inch

I could rebuild her, would be some serious weight gain (maybe) but the biggest issue is safety.
Underneath all the fibreglass & paint I have no idea how damaged the rest of the structure might be or if it will hold together through high g turns etc. I'm thankfull it went the way it did & not on approach to landing or else she woulda gone into the pits.

Well, onto the next kit I guess (Top Flite P-47), but I think I will get another US.

For those 7 minutes she really looked like a keeper
Krener is offline  
Reply With Quote
Old 07-06-2009, 09:18 AM
  #7
prgonzalez
 
prgonzalez's Avatar
 
Join Date: Jun 2004
Location: KATY, TX
Posts: 868
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Ultra sport 60 no more

Krener,

Sorry for your loss. She was a real beaty.

Now for lesssons learned. Where you using 2-56 rods?

In two occasions I broke 2-56 pushrods at the thread end when using them to create the thread inside a brand new clevis. Now, I use a tap to create the thread in new clevises. The rod go in as smooth as in a regular nut after that.

Recently, I decided to go with carbon rods with titanium ends.

Attached Thumbnails
Click image for larger version

Name:	Ay74983.jpg
Views:	14
Size:	36.9 KB
ID:	1230658   Click image for larger version

Name:	Id95242.jpg
Views:	13
Size:	50.1 KB
ID:	1230659  
prgonzalez is offline  
Reply With Quote
Old 07-06-2009, 01:06 PM
  #8
WestCoastFlyer
 
Join Date: Apr 2009
Location: No City,
Posts: 521
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Ultra sport 60 no more

Krener, condolences on the loss. Some planes are harder to lose than others, and sometimes there's a sort of grieving process that goes on. Oh well, we have the memories.

Regarding the crash, maybe the clevis pin was tight in the servo arm and it bound up? Was that pushrod flexing at the servo when full up?
WestCoastFlyer is offline  
Reply With Quote
Old 07-06-2009, 07:02 PM
  #9
Krener
Thread Starter
 
Join Date: Nov 2006
Location: AS, AUSTRALIA
Posts: 295
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Ultra sport 60 no more


Quote:
ORIGINAL: WestCoastFlyer

Krener, condolences on the loss. Some planes are harder to lose than others, and sometimes there's a sort of grieving process that goes on. Oh well, we have the memories.

Regarding the crash, maybe the clevis pin was tight in the servo arm and it bound up? Was that pushrod flexing at the servo when full up?
Clevis was loose as a goose (in a good way)

I had placed ball links at the control surface end to remove the chance of binding, and the 2-56 had rolled threads, not cut threads like a die would make.
One thing is for certain, from here on in only 4-40 stuff.
Will have to look into the titanium rod ends also.

Some may say overkill, but until you experiance something like this you just don't know.
Krener is offline  
Reply With Quote
Old 07-06-2009, 07:12 PM
  #10
qldviking
 
qldviking's Avatar
 
Join Date: Sep 2007
Location: proserpineQueensland, AUSTRALIA
Posts: 991
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Ultra sport 60 no more

its always sad to see a plane go in personally I think 2-56 is too light for anything bigger than a 40 size plane. I always step up to 4-40 with 60 and above. I've had similar experiences in the past with 2-56 h'ware breaking on 60 size ands planes and even one of my 40 sized. I thinks that for the sake of a few dollars and grams I'd sooner err on the side of safety. Just a lesson I too learned the hard way
qldviking is offline  
Reply With Quote
Old 07-06-2009, 07:51 PM
  #11
WestCoastFlyer
 
Join Date: Apr 2009
Location: No City,
Posts: 521
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Ultra sport 60 no more

I haven't used the light gauge threaded pushrods (I recall some fully threaded) in anything going back 15 years, but I'd never have guessed the stresses would have snapped it, so this is definitely a word to the wise for people reading this thread. I really like the carbon / titanium combo above. I over-engineer, it's part of the deal, and a huge part of what's great about RC.

It's a pity that happened to such a gorgeous airplane.
WestCoastFlyer is offline  
Reply With Quote
Old 07-06-2009, 08:27 PM
  #12
Alex7403
 
Alex7403's Avatar
 
Join Date: Jun 2004
Location: New york, NY
Posts: 1,594
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Ultra sport 60 no more

Sorry for your loss krener,

It seems strange it broke like this maybe there was a defect there, a crack or something like it from bending it.
Anyway at the end of a thread is a weak point.

I'm sorry to say but if it was because of a crack it can happen in 4-40 rods as well.

You are from the US60 club you will build more of them.

Alex
Alex7403 is offline  
Reply With Quote
Old 07-10-2009, 09:41 AM
  #13
dragonov3
 
Join Date: Mar 2002
Location: Meridian, ID
Posts: 296
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Ultra sport 60 no more

I lost my bridy air cruiser the identical same way. I had the exact same setup on my elevator push rod. I was at the top of a loop , about 200 feet up when mine gave way. She went in like a lawn dart. Hit so hard it compressed the balsa in the wing as well as shattering every rib, squished tank to about 1/2 its length and destroyed the battery pack. The funny thing is the engine survived, all I needed was a new needle valve assembly.
dragonov3 is offline  
Reply With Quote
Old 07-10-2009, 10:14 AM
  #14
vmsguy
 
Join Date: Apr 2007
Location: Woodville, WI
Posts: 1,159
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Ultra sport 60 no more

This has been a tough summer on Ultra Sports... [sm=cry_smile.gif]

Wow.. off the top of my head, RCU members have lost at least four this summer... [:@]

Maybe I should order another kit, before they're out of stock again.... [sm=wink_smile.gif]
vmsguy is offline  
Reply With Quote
Old 07-10-2009, 12:34 PM
  #15
prgonzalez
 
prgonzalez's Avatar
 
Join Date: Jun 2004
Location: KATY, TX
Posts: 868
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Ultra sport 60 no more


Quote:
ORIGINAL: vmsguy

This has been a tough summer on Ultra Sports... [sm=cry_smile.gif]

Wow.. off the top of my head, RCU members have lost at least four this summer... [:@]

Maybe I should order another kit, before they're out of stock again.... [sm=wink_smile.gif]
I am building one from scratch (RCM plans) at this time and have two GP kits in my closet.
prgonzalez is offline  
Reply With Quote
Reply


Thread Tools
Search this Thread
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -8. The time now is 04:58 PM.