Wattflyer RC Network: RC Universe :: RCU Magazine :: RCU Forums :: RCU Classifieds :: RCU User Reviews :: RCU YouTube
Home Who's Online Calendar Today's Posts RealTime Post Spy Mark Forums Read
Go Back   WattFlyer RC Electric Flight Forums - Discuss radio control eflight > Electric R/C Airplanes > Foamies
Register Members List Wattflyer Extras Articles Search Today's Posts Mark Forums Read Social Groups

Foamies Talk about building, power setups and anything having to do with e-powered foamy planes!

Thank you for your support (hide ads)
Reply
 
Thread Tools Display Modes
Old 07-23-2014, 12:00 AM   #1
abborgogna
Member
 
Join Date: Nov 2013
Posts: 87
Thanked 3 Times in 3 Posts
iTrader: (0)
Friends: (1)
Default Who checks their planes for cracks?

I have a couple of flat depron foamies that I fly a lot. One is a fast pusher jet and the other is an aerobatic sport plane.

A while back I started checking them over for cracks in the foam, most of the time everything is fine. Today was a different story, both planes has minor stress cracks that looking at them on the ground I did not see. In fact the cracks on the sport plane were underneath the fuselage and not visible at all from above. The pusher jet had a minor stress crack in the forward part of the fuselage. The crack was only visible when looked at up close. A small amount of foam safe CA quickly repaired both planes and both are safe to fly.

The reason I bring this up is because both planes could have been lost to structural failure during flight brought on by the stress cracks. I was just wonder who else does these post flying checks of their planes and how often do you find cracks?
Andy
abborgogna is offline  
  Reply With Quote
Old 07-23-2014, 12:53 AM   #2
rcers
Community Moderator
 
rcers's Avatar
 
Join Date: Jul 2005
Location: Trophy Club TX
Posts: 6,241
View rcers's Gallery57
Thanked 507 Times in 497 Posts
Awards Showcase

WAA-08 Pilot 
iTrader: (4)
Friends: (9)
Default

Nope and never lost one to structural failure in flight. But your point is good. I think much more likely is servo arms, horns and clevises.
rcers is online now  
  Reply With Quote
Old 07-23-2014, 02:02 AM   #3
fhhuber
Super Contributor
 
fhhuber's Avatar
 
Join Date: Mar 2013
Posts: 2,318
Thanked 232 Times in 223 Posts
iTrader: (0)
Friends: (1)
Default

Years ago I had the GP Fokker Dr1 60 inch size... I flew it aggressively and it was so reliable (and was transported with wings on) so it didn't get a wings off inspection often.

One day it started acting really strange in flight so I landed. Took the top wing off, then the bottom and the middle wing just flopped. it was a essentially a bag of toothpicks in there.
The airplane wasn't worth repairs needed to make it airworthy again... ALL of the structure had severe cracks.

That taught me to do regular inspections.
fhhuber is offline  
  Reply With Quote
Old 07-23-2014, 04:51 AM   #4
abborgogna
Member
 
Join Date: Nov 2013
Posts: 87
Thanked 3 Times in 3 Posts
iTrader: (0)
Friends: (1)
Default

What struck me about depron is it hides fine cracks very well. I don't check after every session, and maybe I should, but after this past flying session I plan to do a once over when I am done flying. You almost have to move the planes major section around to view the cracks. In the case of the jet I actually cut out a small wedge that covered the crack and then glued in a new piece of depron.
Andy
abborgogna is offline  
  Reply With Quote
Old 07-23-2014, 05:28 AM   #5
mclarkson
Super Contributor
 
mclarkson's Avatar
 
Join Date: May 2010
Location: Wichita, KS
Posts: 3,027
View mclarkson's Gallery4
Thanked 182 Times in 180 Posts
Awards Showcase

AV Contest  Scratchbuilders Award  Outstanding Contributor Award 
iTrader: (0)
Friends: (7)
Default

I don't check 'em as often as I ought. I usually find cracks by accident during pre-flight.

mclarkson is offline  
  Reply With Quote
Old 07-23-2014, 01:10 PM   #6
CHELLIE
Super Contributor
 
CHELLIE's Avatar
 
Join Date: Oct 2006
Location: Hesperia, So. Calif
Posts: 18,732
View CHELLIE's Gallery13
Thanked 2,190 Times in 2,096 Posts
Club: Chino Renegades RC Flying Club
Awards Showcase

Scratchbuilders Award  Scratchbuilders Award  Ambassador Award  100mph Speed Demon 
iTrader: (4)
Friends: (317)
Default

Yes, Depron is Brittle and stiff, thats why its a Great foam to build with, other foams twist and bend and cause a aircraft to not fly right with out a lot of Bracing, I always check the glue points, because thats where the Depron will start to crack at, I have some depron planes here that are 4 to 5 years old, and have a few cracks that needed attention from Vibration , OK OK OK From Hard landings too always a good idea to check all planes for cracks, balsa, foam + plastic, you just never know take care and have fun, Chellie

I may be getting Older, But I Refuse to grow Up I am Having to much Fun to Grow Up LOL
CHELLIE is offline  
  Reply With Quote
Old 07-24-2014, 03:42 PM   #7
solentlife
Super Contributor
 
solentlife's Avatar
 
Join Date: Oct 2010
Location: Ex UK Brit now in Latvia west coast - Ventspils
Posts: 6,422
View solentlife's Gallery47
Thanked 277 Times in 274 Posts
Club: Founder Member Ventspils RC Club. Ex Waltham Chase and Meon Valley Soaring.
Awards Showcase

Scratchbuilders Award  Scratchbuilders Award  Outstanding Contributor Award  125mph Speed Demon 
iTrader: (0)
Friends: (15)
Default

mmmm

I actually give a light twist test to wings .. tail feathers often as I fly a lot at rough sites ... the landings are always a bit rough on the models. It's common for my fin to be cracked at base ... or a stab to be half broke at fuselage.

About Depron ... I find Depron to be far more forgiving than any other sheet foam I can get in Latvia ... I can bend Depron round a tube - but floor sheet as I use often snaps as soon as you try bending it.

But I must admit - I have flown a model at times without knowing it's cracked !

Nigel

222kph PKJ,EDF Concorde, Mini4,Mig3,T45,PKJ twin,ME109,Edge540,Cessna182,Skymaster Biplane,F15,F16,Badius,Ultimate,SE5,Qbee10,450 Heli,V911,J3 Cub Founder 9x forum: http://groups.yahoo.com/group/Flysky_RC_radio/
- Subscribe my Youtube: "solentlifeuk"
solentlife is offline  
  Reply With Quote
Old 07-24-2014, 10:10 PM   #8
mclarkson
Super Contributor
 
mclarkson's Avatar
 
Join Date: May 2010
Location: Wichita, KS
Posts: 3,027
View mclarkson's Gallery4
Thanked 182 Times in 180 Posts
Awards Showcase

AV Contest  Scratchbuilders Award  Outstanding Contributor Award 
iTrader: (0)
Friends: (7)
Default

I flew a biplane once without realizing the bottom port wing was snapped completely in half.

mclarkson is offline  
  Reply With Quote
Old 08-02-2014, 03:54 PM   #9
solentlife
Super Contributor
 
solentlife's Avatar
 
Join Date: Oct 2010
Location: Ex UK Brit now in Latvia west coast - Ventspils
Posts: 6,422
View solentlife's Gallery47
Thanked 277 Times in 274 Posts
Club: Founder Member Ventspils RC Club. Ex Waltham Chase and Meon Valley Soaring.
Awards Showcase

Scratchbuilders Award  Scratchbuilders Award  Outstanding Contributor Award  125mph Speed Demon 
iTrader: (0)
Friends: (15)
Default

Originally Posted by mclarkson View Post
I flew a biplane once without realizing the bottom port wing was snapped completely in half.
My Bosak Mig 15 back in the 80's cracked it's main spar in the wing and in fact it flew better !!
The model had sweepback to give the rudder authority instead of dihedral, it was 3ch only ... on a 20 IC glow.
Turn control was always there but needed a wide area to sweep round in ... but after the main spar cracked - she turned much better ! The wing was flexing in flight and introducing dihedral when rudder moved ...

Of course I repaired her and did not fly her like that more than once ... but it was so marked a difference I can still remember it ...

Nigel

222kph PKJ,EDF Concorde, Mini4,Mig3,T45,PKJ twin,ME109,Edge540,Cessna182,Skymaster Biplane,F15,F16,Badius,Ultimate,SE5,Qbee10,450 Heli,V911,J3 Cub Founder 9x forum: http://groups.yahoo.com/group/Flysky_RC_radio/
- Subscribe my Youtube: "solentlifeuk"
solentlife is offline  
  Reply With Quote
Old 08-02-2014, 08:13 PM   #10
tobydogs
love to build!
 
tobydogs's Avatar
 
Join Date: Jan 2010
Location: nj usa
Posts: 3,031
Thanked 202 Times in 199 Posts
Club: rcrcc rockland county,ny
Awards Showcase

Outstanding Contributor Award 
iTrader: (0)
Friends: (17)
Default

I give the superfly delta a slight twist and bend all over to see if any old repairs are still holding or if I need to make new ones. otherwise I mostly fly balsa and don't check for cracks except in the spring tuneup I do on all planes before the season starts and check all moving parts and servos to make sure all ok to fly.

narrow is the place to land...wide is the space to crash....choose the narrow way!
tobydogs is offline  
  Reply With Quote
Old 08-02-2014, 11:43 PM   #11
gramps2361
Community Moderator
 
gramps2361's Avatar
 
Join Date: Dec 2008
Location: oxford, MA
Posts: 6,745
View gramps2361's Gallery9
Thanked 605 Times in 600 Posts
Club: Rocky Hill Flying Circus
iTrader: (3)
Friends: (21)
Default

Normally I don't check for cracks, but I do check the connectors and servos arms for problems.
I had my Telelink crack at the wing root once couldn't figure out why it was handling so bad. Landed and checked it out that's when I found the crack in the foam. This week I was throwing it around the sky and noticed it was acting funny again. Landed and I cracked the wing on the opposite side. All fixed, but it is getting a make over to a night flyer. I've beat the snorts out of this plane learning 3D time to retire her to some easy night fun.


Attached Thumbnails
Click image for larger version

Name:	DSCN0736.jpg
Views:	31
Size:	57.2 KB
ID:	176845  
gramps2361 is offline  
  Reply With Quote
Old 08-22-2014, 11:24 PM   #12
Dimeflyer
Member
 
Join Date: Apr 2010
Location: Southweastern Pa.
Posts: 767
Thanked 57 Times in 55 Posts
Club: haven't picked one yet ?
iTrader: (0)
Friends: (2)
Default

I check every thing like we are supposed to Gramps 2361 before and after every flight ! I have had every thing go wrong that can't go wrong with my planes !!
I just lost the Rascal I spent all winter building because the rear former at the tail end
broke in flight and the cable that came with the kit kinked the guide and slammed it down on its tail and wing and tore it apart with just enough left to show me where the problem was !
George
Dimeflyer is offline  
  Reply With Quote
Old 08-23-2014, 01:59 PM   #13
carpetbagger
Member
 
Join Date: Dec 2013
Location: East BugSplat, NC
Posts: 229
Thanked 16 Times in 16 Posts
iTrader: (0)
Friends: (1)
Default

Absolutely, and since my flying skills are questionable I am rarely disappointed - almost always find cracks.
carpetbagger is online now  
  Reply With Quote
Old 08-25-2014, 09:15 PM   #14
Dimeflyer
Member
 
Join Date: Apr 2010
Location: Southweastern Pa.
Posts: 767
Thanked 57 Times in 55 Posts
Club: haven't picked one yet ?
iTrader: (0)
Friends: (2)
Default cracks

Ah men to finding them !
George
Dimeflyer is offline  
  Reply With Quote
Old 08-25-2014, 11:08 PM   #15
abborgogna
Member
 
Join Date: Nov 2013
Posts: 87
Thanked 3 Times in 3 Posts
iTrader: (0)
Friends: (1)
Default

I am glad I am not the only person looking for cracks in foam airplanes. I have come to the conclusion that foam planes have a finite life time and are basically a throw away item. I do not mean this in a bad way, they are cheap to build, easy to build, and a lot of fun to fly. When they reach end of life, toss them and build another one. That's what I do. I bought a package of depron and build my own.
Andy
abborgogna is offline  
  Reply With Quote
Reply

  WattFlyer RC Electric Flight Forums - Discuss radio control eflight > Electric R/C Airplanes > Foamies

« Previous Thread | Next Thread »

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
For Sale Aluminum Motor Mounts for Multiplex, Parkzone, and Flyzone Super Cub Planes terrynshed Motors and Speed Controllers for sale & WTB 4 09-24-2012 06:33 PM
Details Of The Extreme Fight EXP Doc Austin 3D Flying 0 03-11-2012 07:31 PM
Hobbico has a new line of TX ready planes and the AnyLink Module AEAJR Beginners 22 03-06-2012 10:34 PM
Ultra Micro planes gear in the 250 size planes wattman WWI Era 4 03-31-2011 05:12 PM


All times are GMT +1. The time now is 02:02 PM.


Powered by: vBulletin
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright 2005 WattfFlyer.com
RCU Eflight HQ

Charities we support Select: Yorkie Rescue  ::  Crohn's & Colitis Foundation



Page generated in 0.29297 seconds with 52 queries