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Fly Eagle F-16 1:4.6 Advance, wow

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Fly Eagle F-16 1:4.6 Advance, wow

Old 11-11-2013, 02:36 AM
  #301  
Falcon 64
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Great video, Ali
What engine and position of CG are you using, and what plane is your favourite ?

Last edited by Falcon 64; 11-11-2013 at 03:34 AM.
Old 11-11-2013, 06:04 AM
  #302  
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Originally Posted by Carbon-Customs
ive now made a cut into the wing to have a look.

and its the same build up as the bad "hawk 1:4,5" tail

the tiny screws and the honeycomb plate (even when its made with carbon) cant take the stress.
This is a plane which in normal manoeuvres will pull about 10 g's max, (measured with my 1:5 F16 at 25kg) so if the lift of the wings is about 50% of the plane then its still 75kg of force on each wing!

i put alot of stress on the wings, and head some cracking noises...

well i think a OK fix for this i to fill the space between the rod and the sideplates is to fill it with microballons and epoxy.

i would drill about 5 times 8mm holes under the rod to be able to fill with epoxy, this shouldent weaken the wing.

i will also open the rudder, i guess its made the same way.
You guys are missing the point. The issue here is not the high loading, it's the frequency-loading combination. The test that you did is good for static stress, but the problem is that when you fly the wing tube flexes up and down, and the little screws will eventually eat into the HC spars.......even with carbon reinforcement. Changing the tube will not make things better.

Let me put it in perspective, the HC is like poop.......lets assume it is not there at all. The carbon laminate is just a thin piece of .030" rigid composite, one on each side. A thin piece of super riigid composite will crack easily under vibration, which is what is happening when you fly. How soon will it crack...........I have no idea! Every flight is a flight closer to the limit.

Kasper I see your picture and it only proves that even in the higher end products, these guys still use the methods that have proved to fail. Those two glue spots may help some, but filling the area completely with adhesive will improve things greatly (still sorry you had to cut the wing open though).

Beautiful bird in the air........Hope you guys can make it work. The fix is out there.

David
Old 11-11-2013, 06:11 AM
  #303  
Carbon-Customs
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hey Falcon...

as you see i have filled it with hysol and the amount of carbonfiber used with the honeycomb is quite dense...

so after i now have casted this solid box of hysol (60g total) i feel confident that the wings are very strong...

i have also inspected the glue joints in the wing.. and they are very nice glued together, with a carbon fiber roving together with it.







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Last edited by Carbon-Customs; 11-11-2013 at 06:13 AM.
Old 11-11-2013, 07:29 AM
  #304  
Falcon 64
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Looks good, Kasper!
You are quite effective ...and I know your plans for this one is to take things abit further to say the least...

And David, we understand everything you are talking about here, we just have different "calculations" about the risk involved.
There is (my point of view) several ordinary ways to eliminate the subject here, and as I said, I`ve never seen such a way to ancor one of the many "hearts" in a model..
It`s cheap, it`s fast and it`s far from optimal. FEJ and others really should take action here.
Final thing is up to the builder/owner.
Old 11-11-2013, 07:57 AM
  #305  
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Originally Posted by Ali
Hi Ali
great looking jet. Interestingly I see the elevator and aileron linkages are external. Was this your preferred option?
many thanks, Gregg
Old 11-11-2013, 08:59 AM
  #306  
Ali
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Yes, I flew it some 20-30 times with the factory set up of internal links. It went well, but I wanted to try it the old school way just to see if it is any different. I have noticed that I get a better roll rate and more accurate centring now ( Less re trimming required ) with the external linkage set up.
Old 11-11-2013, 09:03 AM
  #307  
Falcon 64
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We should have a "like" button here...
And the opposite.
Old 11-11-2013, 09:26 AM
  #308  
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Looks good Falcon, you did good!
Old 11-11-2013, 09:27 AM
  #309  
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Ali's F-16 looks like it came out of a Red Flag mission. Looks like ****! Good job!
Old 11-11-2013, 09:53 AM
  #310  
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Double posted

Last edited by Falcon 64; 11-11-2013 at 09:58 AM.
Old 11-11-2013, 09:55 AM
  #311  
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Originally Posted by FalconWings
Looks good Falcon, you did good!
So many ways..
Old 11-15-2013, 05:33 AM
  #312  
Carbon-Customs
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just a FEj 1:4,6 F-16 tact.. the original fiberglass tanks hold 9,18-10,2 liters of fuel!!!!!!!!!!!!!!!!!!!!!!!!!! thats absurd!
Old 11-15-2013, 06:02 AM
  #313  
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Originally Posted by Carbon-Customs
just a FEj 1:4,6 F-16 tact.. the original fiberglass tanks hold 9,18-10,2 liters of fuel!!!!!!!!!!!!!!!!!!!!!!!!!! thats absurd!

That's insane!

But maybe it's to ensure you still have 5-6L once they finished leaking
Old 11-15-2013, 06:11 AM
  #314  
Ali
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Funny that. I have never had a leaking tank on either of my FEJ jets. More than can be said for the various Ultra Flashes that I have played with, Futura's , big hawks and pretty much any air world kit that I have owned.
Old 11-15-2013, 06:15 AM
  #315  
Carbon-Customs
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i agree with Ali..

ive seen 3 ultra flashes with laking neck tanks...

my old FEJ F-16 was leaking from one tank because they got sucked flat when i did sucktion tests for the P300

but theese bare made the same way, i think the 2 small one would crack on the outside when pulling 1000ml/min from them.. even with 6mm fittings..
Old 11-15-2013, 07:07 AM
  #316  
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Originally Posted by Carbon-Customs
i agree with Ali..

ive seen 3 ultra flashes with laking neck tanks...

my old FEJ F-16 was leaking from one tank because they got sucked flat when i did sucktion tests for the P300

but theese bare made the same way, i think the 2 small one would crack on the outside when pulling 1000ml/min from them.. even with 6mm fittings..

Easy fix, use BVM large diameter tank tubing and hardware.
Old 11-15-2013, 07:08 AM
  #317  
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i dont think they are 5mm INSIDE ALL OVER as mine is...

i have never seen anything that large that you could buy.
Old 11-15-2013, 07:12 AM
  #318  
Ali
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JMP did a large large fuel fittings set. They looked like they belonged on a powerboat
Old 11-15-2013, 08:07 AM
  #319  
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Originally Posted by Ali
JMP did a large large fuel fittings set. They looked like they belonged on a powerboat

That's what I'm talking about. Can't have fuel venting large enough!! One you get to the pump inlet you can down size to the correct engine inlet size.
Old 11-16-2013, 01:44 PM
  #320  
Falcon 64
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Fuel venting isn`t the problem, really? Air is 900 times less dense than fuel, right?..
I find it strange to have the vent as large as the fuel-line or bigger, could make it easily yes, but not a need to...
If you ever find a tank imploded, it won`t ever be the first tank..then! we`re into fuel lines..
All lines serving fuel must me scaled to the need, and if you add a wire from the ECU battery from negative to every separate fuel-line, you also eliminate static build-up. Just that easy. The battery absorbs it all, and eliminates it.
No special additives needed any longer..

I have four tanks in my kit, just pressured them slightly to find a leak, two thumbs up here. And since I got mine in glass, I`ll
wrap them in kevlar.
10 litres in those four sounds beyond..but if you say so . Sounds like smoke..

Last edited by Falcon 64; 11-16-2013 at 02:27 PM.
Old 11-16-2013, 04:00 PM
  #321  
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Not sure I unserstand your post Falcon. You are saying venting is or is not a problem?
Old 11-17-2013, 03:27 AM
  #322  
Falcon 64
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It depends on how you do it.
Many tanks in series, narrow tubing, restricted brasstubing (many suppliers have their tubing cut so the ends are in less diameter).
Tanks made of the same layup as smaller tanks are much weaker but can easily be reinforced my a belt of carbonrowings.
Fuelflow, it`s a difference if you use a 10 kg engine compared to a 20.
Going thru the factors that is the cause, very often makes it NOT a problem, yes.
Old 12-13-2013, 04:39 PM
  #323  
Falcon 64
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Have someone here ordered full ordinace and received pictures of it, or I`m the only one?
Old 12-13-2013, 08:22 PM
  #324  
David Jackson
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What is the best center-of-gravity location for the 1/4.6 scale fej F-16? Also, how much movement for the ailerons and elevator?

Last edited by David Jackson; 12-13-2013 at 08:47 PM.
Old 12-14-2013, 07:15 AM
  #325  
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Mine is not flying yet, so I wonder about the same..

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