Another Ultra Flash Repair Thread
#1
Thread Starter
My Feedback: (51)
Another Ultra Flash Repair Thread
Hello Guys,
Some of you may remember my former Ultra Flash resurrection thread:
http://www.rcuniverse.com/forum/rc-j...step-step.html
That Ultra Flash was repaired with great success and has been flying great ever since:
https://www.youtube.com/watch?v=nTVLCJ0hdDM Unfortunately, one of my friends lately crashed his UF when he had an engine cut right after an aborted landing / Go Around attempt.
The damage consists of breaking the entire nose section off (some small pieces went missing) in front of the ducts, and cracking several other areas of the fuselage, nose cone completely cracked, horizontal stabilizer survived, but wing suffered damage to both tips, and to the root area skins, one hardwood wing mount displaced, split open leading edge on one side etc etc.
The damage is quite severe.
Looking at a broken jet such as this one, most people would say "BIN IT!" but we have the magician from Kiryat Gat, Mr. David Ifrah.
David is a professional UAV composite builder (as a profession) and fellow modeler and jet enthusiast. He took one look at the broken UF and said "Ill repair it for you, no sweat!".
So I decided to get the broken jet from my friend and let David work his magic on it.
First pictures im posting show the damage to the jet before the repairs.
Check it out.
Some of you may remember my former Ultra Flash resurrection thread:
http://www.rcuniverse.com/forum/rc-j...step-step.html
That Ultra Flash was repaired with great success and has been flying great ever since:
https://www.youtube.com/watch?v=nTVLCJ0hdDM Unfortunately, one of my friends lately crashed his UF when he had an engine cut right after an aborted landing / Go Around attempt.
The damage consists of breaking the entire nose section off (some small pieces went missing) in front of the ducts, and cracking several other areas of the fuselage, nose cone completely cracked, horizontal stabilizer survived, but wing suffered damage to both tips, and to the root area skins, one hardwood wing mount displaced, split open leading edge on one side etc etc.
The damage is quite severe.
Looking at a broken jet such as this one, most people would say "BIN IT!" but we have the magician from Kiryat Gat, Mr. David Ifrah.
David is a professional UAV composite builder (as a profession) and fellow modeler and jet enthusiast. He took one look at the broken UF and said "Ill repair it for you, no sweat!".
So I decided to get the broken jet from my friend and let David work his magic on it.
First pictures im posting show the damage to the jet before the repairs.
Check it out.
Last edited by i3dm; 08-18-2016 at 05:55 AM.
#3
Thread Starter
My Feedback: (51)
At this point the jet was delivered to David (Dudu).
David started by cleaning off all the paint from the inside, cutting off the (damaged) inlet duct in order to repair it outside the fuse, and then applyied carbon ans glass cloth to damaged areas, to set the fuse into place structurally.
slots / cavaties were closed with structural 3M Epoxy + Aero Seal mix.
David started by cleaning off all the paint from the inside, cutting off the (damaged) inlet duct in order to repair it outside the fuse, and then applyied carbon ans glass cloth to damaged areas, to set the fuse into place structurally.
slots / cavaties were closed with structural 3M Epoxy + Aero Seal mix.
Last edited by i3dm; 08-18-2016 at 05:57 AM.
#11
My Feedback: (6)
No disrespect here but plain elbow grease ,
ressurection of high G maneuvering models as such is much of a risk as no one can actually "see" beyond the surface of "non damaged areas " such as remaining wings etc' .
The risk involved might greatly influence everyone as any of the un detected structural damages though not seen can still exists as cracks in the structure ...
Fixing one of these and calling it a sucsses is no more than plainly luck at the best , others would call it lack of fully understanding the nature of physics .. Which might end in a catastrophic failure in flight leading to damage to property or even worse to other bystanders .... So , following those who call out to "Bin it " would actually the right way to go IMHO !
ressurection of high G maneuvering models as such is much of a risk as no one can actually "see" beyond the surface of "non damaged areas " such as remaining wings etc' .
The risk involved might greatly influence everyone as any of the un detected structural damages though not seen can still exists as cracks in the structure ...
Fixing one of these and calling it a sucsses is no more than plainly luck at the best , others would call it lack of fully understanding the nature of physics .. Which might end in a catastrophic failure in flight leading to damage to property or even worse to other bystanders .... So , following those who call out to "Bin it " would actually the right way to go IMHO !
#12
lavi rider ,
I really do not agree with your philosophy ....
The guy (Dudo) facility and rebuilding it, aviation constructor little more than 10 years
Maybe he does not understand the philosophy,But, build and repair aircraft Composite he knows
I trust his work in 100%
I really do not agree with your philosophy ....
The guy (Dudo) facility and rebuilding it, aviation constructor little more than 10 years
Maybe he does not understand the philosophy,But, build and repair aircraft Composite he knows
I trust his work in 100%
#16
My Feedback: (34)
I don't agree with you either. Are you planning on buying this jet?? If not what's the problem? Apperantly this gentleman is a highly skilled composite worker who does this for a living building UAV's and understands the stress these airframes go through. If the company he works for trusts him why can't anyone else?
No disrespect here but plain elbow grease ,
ressurection of high G maneuvering models as such is much of a risk as no one can actually "see" beyond the surface of "non damaged areas " such as remaining wings etc' .
The risk involved might greatly influence everyone as any of the un detected structural damages though not seen can still exists as cracks in the structure ...
Fixing one of these and calling it a sucsses is no more than plainly luck at the best , others would call it lack of fully understanding the nature of physics .. Which might end in a catastrophic failure in flight leading to damage to property or even worse to other bystanders .... So , following those who call out to "Bin it " would actually the right way to go IMHO !
ressurection of high G maneuvering models as such is much of a risk as no one can actually "see" beyond the surface of "non damaged areas " such as remaining wings etc' .
The risk involved might greatly influence everyone as any of the un detected structural damages though not seen can still exists as cracks in the structure ...
Fixing one of these and calling it a sucsses is no more than plainly luck at the best , others would call it lack of fully understanding the nature of physics .. Which might end in a catastrophic failure in flight leading to damage to property or even worse to other bystanders .... So , following those who call out to "Bin it " would actually the right way to go IMHO !
#17
My Feedback: (114)
lavi rider-
I completely agree. Unless he is opening up the wing to check every rib, this is very unsafe. Because it's a one piece wing, it is very very difficult to actually see every rib and make sure they didn't come un-glued. But I don't know, maybe he is able to see all the ribs since the jet sustained quite a bit of damage.
I completely agree. Unless he is opening up the wing to check every rib, this is very unsafe. Because it's a one piece wing, it is very very difficult to actually see every rib and make sure they didn't come un-glued. But I don't know, maybe he is able to see all the ribs since the jet sustained quite a bit of damage.
#19
My Feedback: (6)
From my 30 years plus in composite structures , building , designing , later into composite structure analysis let us say done my share in the field ( working with CARF mainly in the military aspect of drones , CARF models is no more than a hobby and side kick :-) ... ) and my words where in general about high stress maneuvering platform be it CARF products or any other in that matter I'm saying as a fact .... Without complex testing and analysing tooling there's absolutely no way not even an endoscope that can reveal failure in composite structures ... That's why with certain grade of damage its abosulty non recommended to try and fix it ... The risk is extremely high as explained earlier .
#21
Thread Starter
My Feedback: (51)
David is on with his great work - Right side of fuse now completely see through.
we found a bit of spackle here and there under the original paint. thats interesting.
Now he will finish all internal reinforcements, and later it will get a completely new finish...
i will tell you already paint scheme will be special.
we found a bit of spackle here and there under the original paint. thats interesting.
Now he will finish all internal reinforcements, and later it will get a completely new finish...
i will tell you already paint scheme will be special.
Last edited by i3dm; 08-21-2016 at 11:59 AM.