Fly Eagle F-16 1:4.6 Advance, wow
#302
My Feedback: (57)
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.
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.
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
#303
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.
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.
Last edited by Carbon-Customs; 11-11-2013 at 06:13 AM.
#304
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.
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.
#305
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#306
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Join Date: Apr 2002
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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.
#314
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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.
#315
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..
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..
#316
My Feedback: (57)
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..
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.
#320
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..
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.
#322
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.
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.