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RE: Maj. Woody's Fei Bao L-39 - 4/9/2012 12:18 PM   
ausfester


 

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From: Victoria, AUSTRALIA
Status: offline 		Jack,

That's an amazing idea, I've done it quickly and I think its going to work a treat.
1. If the pipe moves it will ensure all thrust still goes out the pipe
2. It will ensure that the pipe won't collapse

Anyone know the melting point of carbon fibre?? Jack is your l39 flying yet or still being built.
Would love to know if you've had any issues, post a pic if you can too.

My bellmouth is about 1-2inches long, I'm considering cutting it down more

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RE: Maj. Woody's Fei Bao L-39 - 4/9/2012 2:34 PM   
frizlot


 

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From: JHB, SOUTH AFRICA
Status: offline 		I would recommend running a fillet of good epoxy around all the gear wood work, I have heard of them all coming loose after a bounce. The glue the factory uses here in my opinion is crappy.

Mine really flies well but will drop a wing if you are too slow on landing !

Here are some pics

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RE: Maj. Woody's Fei Bao L-39 - 4/15/2012 12:08 PM   
Andrew Bailey


 

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From: Chippenham Wiltshire, UNITED KINGDOM
Status: offline 		 My L39 did not come with any wing bolts or the tool used to detach the fin. Could anyone share with me what they use as wing bolts? I guess just standard hex drive m4 bolts would be OK, but it looks like access would make them tricky to drive. Also, what is the T shaped tool I have seen being used (pictures in the manual) to undo the fin. I have tried all my hex screwdrivers and none of them seem to engage in whatever it is that secures the fin. Help would be appreciated. Thanks, Andrew

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RE: Maj. Woody's Fei Bao L-39 - 4/15/2012 12:20 PM   
ausfester


 

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From: Victoria, AUSTRALIA
Status: offline 		M4 should be fine I think my bolts were about an inch long. I got no special t tool.
I used a tool with a bendy head which has m4 adaptor but you could get It in with a standard Allen (hex) key.
All hex keys for all surface affixing. Took me awhile today but I figured out how to get my scale pilots and cockpit into the hatch.
I'll post some pics soon

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RE: Maj. Woody's Fei Bao L-39 - 4/15/2012 3:02 PM   
Andrew Bailey


 

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From: Chippenham Wiltshire, UNITED KINGDOM
Status: offline 		That's great. Much appreciated. Thank you.
quote:

ORIGINAL: ausfester

M4 should be fine I think my bolts were about an inch long. I got no special t tool.
I used a tool with a bendy head which has m4 adaptor but you could get It in with a standard Allen (hex) key.
All hex keys for all surface affixing. Took me awhile today but I figured out how to get my scale pilots and cockpit into the hatch.
I'll post some pics soon



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RE: Maj. Woody's Fei Bao L-39 - 4/22/2012 10:26 PM   
Andrew Bailey


 

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From: Chippenham Wiltshire, UNITED KINGDOM
Status: offline 		Is anyone using crow on their FB L39?  Or maybe you you have tried it and decided it doesn't work well. Any experiences would be helpful.

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RE: Maj. Woody's Fei Bao L-39 - 4/30/2012 1:49 AM   
gamalierlozada


 

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From: Fayetteville, NC, USA
Status: offline 		Can someone please measure the distance X in the picture below. I need it to decide which EDF unit I will buy for it. Also are the struts mounting diameter 1/2" or just 5/32 pins.

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RE: Maj. Woody's Fei Bao L-39 - 4/30/2012 12:32 PM   
EDFCrazy


 

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Status: offline 		Gamalier, The undercarriage is either 12" or 11mm it definitely isnt the pin method. The rear of the plane also doesnt look like that anymore, its more closed up like this picture of the jetlegend L-39. Mine is also the newer design at the back and after cutting away some of the material, i was only able to achieve 90mm.

Simon

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RE: Maj. Woody's Fei Bao L-39 - 4/30/2012 12:39 PM   
gamalierlozada


 

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Status: offline 		Thanks,

More cutting to do!


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RE: Maj. Woody's Fei Bao L-39 - 5/21/2012 8:30 PM   
Andrew Bailey


 

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From: Chippenham Wiltshire, UNITED KINGDOM
Status: offline 		WARNING - Please very carefully check the integrity of your L39 fuselage where the retaining bolt passes through.

Last weekend I lost my lovely Global Jets Fai Bao L39 just three minutes into its 12th flight when the wing detached from the rest of the airframe during a gentle wing over. The fuselage structure broke away where the wing retaining bolt goes through. The recovered wing still had the bolt in with fuselage skin and ply attached where it had broken away. 

The plane was a total loss apart from the turbine which I think can be repaired. The only mechanical or electronics to survive were on the detached wing!

I am not trying to point the finger at the manufacturer, but they have of course suggested that the failure was due to overstressing of the airframe before this flight. There is no way of proving this one way or the other, but I do not believe that this failure was caused by any hard landings or mishandling. In the first few flights there were a couple of 'firm' arrivals but nothing hard enough to do any damage whatsoever to the undercarriage and they were quite a lot less abrupt than some of Dom's early arrivals. 

I would hate anyone else to suffer the same loss, so if you own a FBJ L39, of perhaps any FBJ plane, please do what you can to check and perhaps reinforce the fuselage. 

Andrew


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RE: Maj. Woody's Fei Bao L-39 - 5/31/2012 5:40 PM   
megafly


 

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quote:

ORIGINAL: wearypanda

WARNING - Please very carefully check the integrity of your L39 fuselage where the retaining bolt passes through.

Last weekend I lost my lovely Global Jets Fai Bao L39 just three minutes into its 12th flight when the wing detached from the rest of the airframe during a gentle wing over. The fuselage structure broke away where the wing retaining bolt goes through. The recovered wing still had the bolt in with fuselage skin and ply attached where it had broken away. 

The plane was a total loss apart from the turbine which I think can be repaired. The only mechanical or electronics to survive were on the detached wing!

I am not trying to point the finger at the manufacturer, but they have of course suggested that the failure was due to overstressing of the airframe before this flight. There is no way of proving this one way or the other, but I do not believe that this failure was caused by any hard landings or mishandling. In the first few flights there were a couple of 'firm' arrivals but nothing hard enough to do any damage whatsoever to the undercarriage and they were quite a lot less abrupt than some of Dom's early arrivals. 

I would hate anyone else to suffer the same loss, so if you own a FBJ L39, of perhaps any FBJ plane, please do what you can to check and perhaps reinforce the fuselage. 

Andrew




Won! just saw your wing photo on another post, I've just received mine L39 from Feibao,it looks very , I will be doing some reinforcement in this area, thanks for info.


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RE: Maj. Woody's Fei Bao L-39 - 6/1/2012 4:44 AM   
ausfester


 

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From: Victoria, AUSTRALIA
Status: offline 		Hey guys,

Maidened my l39 on wednesday, two good flights. With an K80 shes a rocket.
First landing was hot but second was on the money. Can someone please advise of what post has the pic from the post above?
Would like to see what everyone else is talking about.

32 mm of flap i went with seemed perfect, force the nose down so she dropped nicely, and flared upon the threshold to wash off the speed.
Seems like the retract struts on the rear are a little flimsy (left to right) where the brakes pull them in. Anyone else experiencing this?
I also have random retract / brakes. Brakes were fine the other week now theyre loosing air on one to two cycles. I tested lastnight on bench seems fine so i ll taxi test again this weekend.

Anyhow here is a pic of my L39.


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RE: Maj. Woody's Fei Bao L-39 - 6/1/2012 4:51 AM   
ausfester


 

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From: Victoria, AUSTRALIA
Status: offline 		another point, i balanced on 109mm, or about 4 5/16ths i think as per Maj Woodys post.
On a nice turn seems like she is dropping the nose slightly, perhaps marginally nose heavy.

Anyone found that the nose wheel spring needs stiffening more, seems like on take off you have to yank on the elevator to get the bird off the ground. I suspect it is becuse the nose wheel is compressed down changing the profile of the aircraft to be lower at the nose.

Any thoughts



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RE: Maj. Woody's Fei Bao L-39 - 6/2/2012 11:26 PM   
megafly


 

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From: Sao PauloSao Paulo, BRAZIL
Status: offline 		How do you fited the fuel tank? Mine is wider than the fuselage, I can't put it from cockipt.

Ausfester, you cg is at the main spar?
Thanks!

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RE: Maj. Woody's Fei Bao L-39 - 6/4/2012 1:14 PM   
ausfester


 

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From: Victoria, AUSTRALIA
Status: offline 		fueltank fits if you turn it on it side and flex the fuse around the tallest part.
given its rounded its fairly simple, i put mine in and out three times before the paint split just a tiny bit on the flush part.
check your tank dont leak mine dod but i just used a bit of hysol to sort it out..

cg is behind the spar, im slightly nose heavy so ill be taking about 40grams of lead out of the front.



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RE: Maj. Woody's Fei Bao L-39 - 6/4/2012 1:32 PM   
afterburner



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From: Moseley, VA, USA
Status: offline 		Megafly, If you notch the lip of the cockpit you can slip the tank in where the seam of the tank(the widest part) can go through the notches and you won't have to stretch the fuse so much.

Marty



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RE: Maj. Woody's Fei Bao L-39 - 6/4/2012 2:08 PM   
megafly


 

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From: Sao PauloSao Paulo, BRAZIL
Status: offline 		I have to cut the lip in the cockpit area but reinforced with carbon fiber.







Did you guys glue the stabilizer?

Thanks !

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RE: Maj. Woody's Fei Bao L-39 - 6/4/2012 3:42 PM   
Jim Cattanach



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From: Larnaca, , CYPRUS
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quote:

ORIGINAL: wearypanda

WARNING - Please very carefully check the integrity of your L39 fuselage where the retaining bolt passes through.

Last weekend I lost my lovely Global Jets Fai Bao L39 just three minutes into its 12th flight when the wing detached from the rest of the airframe during a gentle wing over. The fuselage structure broke away where the wing retaining bolt goes through. The recovered wing still had the bolt in with fuselage skin and ply attached where it had broken away. 

The plane was a total loss apart from the turbine which I think can be repaired. The only mechanical or electronics to survive were on the detached wing!

I am not trying to point the finger at the manufacturer, but they have of course suggested that the failure was due to overstressing of the airframe before this flight. There is no way of proving this one way or the other, but I do not believe that this failure was caused by any hard landings or mishandling. In the first few flights there were a couple of 'firm' arrivals but nothing hard enough to do any damage whatsoever to the undercarriage and they were quite a lot less abrupt than some of Dom's early arrivals. 

I would hate anyone else to suffer the same loss, so if you own a FBJ L39, of perhaps any FBJ plane, please do what you can to check and perhaps reinforce the fuselage. 

Andrew



I thought the whole idea of buying a Global jet club model was, they checked, reinforced & upgraded the jet to ensure failures of your type were eliminated? Or is the Fei Bao model just sold as it comes from the factory?

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RE: Maj. Woody's Fei Bao L-39 - 6/4/2012 4:30 PM   
Andrew Bailey


 

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quote:

ORIGINAL: Jim Cattanach
I thought the whole idea of buying a Global jet club model was, they checked, reinforced & upgraded the jet to ensure failures of your type were eliminated? Or is the Fei Bao model just sold as it comes from the factory?


That's what I thought too. Their response was that there are plenty of their L39 models with lots of flights on them so my incident must have been due to damage caused by me landing it hard. You live and learn I guess. I personally think that if GJC really are reinforcing the FB models then maybe they need to do a much better job in some places.



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RE: Maj. Woody's Fei Bao L-39 - 6/4/2012 4:35 PM   
afterburner



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Status: offline 		Global does not do additional work on Fei Bao jets I'm pretty sure. I believe they go through the kit before shipping it just for visual inspection to confirm it is complete. I think they only do upgrades and mods to JetLegend.

Marty

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RE: Maj. Woody's Fei Bao L-39 - 6/4/2012 4:38 PM   
megafly


 

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Status: offline 		Can you confirm if I have to Glue the elevator?
Thanks.

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RE: Maj. Woody's Fei Bao L-39 - 6/4/2012 4:38 PM   
gamalierlozada


 

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Status: offline 		I have a question for the owners of this jet. Does the wing bolts sit against the fiberglass? Like screw, washer, fiberglass and then the wing on the other side? I used to own a Comp-Arf and they always put a wood former or a wood washer between the screw's washer and the fiberglass to reduce the sheer effect of the screw washer. I will have one of these planes delivered to me in a couple of weeks and I find this information really helpful. Thanks for sharing it. Sorry that you lost your plane due to a failure!


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RE: Maj. Woody's Fei Bao L-39 - 6/4/2012 5:00 PM   
Andrew Bailey


 

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quote:

ORIGINAL: gamalierlozada

I have a question for the owners of this jet. Does the wing bolts sit against the fiberglass? Like screw, washer, fiberglass and then the wing on the other side? I used to own a Comp-Arf and they always put a wood former or a wood washer between the screw's washer and the fiberglass to reduce the sheer effect of the screw washer. I will have one of these planes delivered to me in a couple of weeks and I find this information really helpful. Thanks for sharing it. Sorry that you lost your plane due to a failure!



The bolt goes through what appears to be a reasonably substantial ply structure. These photo's I took of the detached wing show exactly what was pulled away from the fuselage.

  




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RE: Maj. Woody's Fei Bao L-39 - 6/4/2012 5:08 PM   
megafly


 

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Status: offline 		Wearypanda, I've reinforced that part of the fuselage sorry for your loss..
Have you glued your elevator or is just screw?

Thanks.

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RE: Maj. Woody's Fei Bao L-39 - 6/4/2012 5:10 PM   
gamalierlozada


 

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Status: offline 		Thanks for the picture Wearypanda. Yes it a weird failure speacially with the big piece of fiberglass that came out. But both of the theories are right either was week at that spot or it was crack from the hit of the landing or perhaphs both. I guess the best thing to do is reinforce the area.

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