Jetlegend Mig 29 Fulcrum
03-27-2011, 10:54 PM
#501
Join Date: Dec 2004
Location: PlaistowWest Sussex, UNITED KINGDOM
Posts: 418
Received 0 Likes
on
0 Posts
RE: Jetlegend Mig 29 Fulcrum
Hi Rob,
Sorry to hear of your problems. Perhaps I should have mentioned it, but I too had a hydraulic line swell into a bubble many months ago. I saw it before it burst and replaced the line, with mine I know that heat was not an issue and I look at the lines in my preflight check. My system is now operating well, the only problem I have now is I am now on the fourth of the UMS hydraulic pumps. They all leak and let air get into the system, I have just ordered a Eurokit pump.
John
Sorry to hear of your problems. Perhaps I should have mentioned it, but I too had a hydraulic line swell into a bubble many months ago. I saw it before it burst and replaced the line, with mine I know that heat was not an issue and I look at the lines in my preflight check. My system is now operating well, the only problem I have now is I am now on the fourth of the UMS hydraulic pumps. They all leak and let air get into the system, I have just ordered a Eurokit pump.
John
03-28-2011, 12:00 AM
#503
My Feedback: (24)
Join Date: Dec 2001
Location: New Braunfels,
TX
Posts: 288
Likes: 0
Received 0 Likes
on
0 Posts
RE: Jetlegend Mig 29 Fulcrum
John,
So you had a line bubble also. Very interesting. I'm going to research the availability of high pressure 4 mm lines for replacement of all of my lines. This was the last place I expected problems as I had cycled the gear at least 40 times w/o any problems whatsoever. My problem with the line may just have been coincidental with the location of the turbine electrical lines. Dunno.
As far as the flying went, I think your CG at the back of the cross brace was right on. I needed about three clicks of down and two clicks of left and she flew straight and level. This airplane definitely has a presence in the air.
Haven't disassembled the gear yet to learn the extent of the damage. I think it will be fairly simple to repair. I also noticed one of the door hinges that broke was the really small one on the left main door. I've not seen these available anywhere in the after market. This could be a challenge to locate one.
It appears Murphy's Law is still valid. On the 41st. cycle, which also happened to be the maiden flight, the line burst. Why didn't it burst on the 39th. cycle on the ground?
Rob
F15driver
So you had a line bubble also. Very interesting. I'm going to research the availability of high pressure 4 mm lines for replacement of all of my lines. This was the last place I expected problems as I had cycled the gear at least 40 times w/o any problems whatsoever. My problem with the line may just have been coincidental with the location of the turbine electrical lines. Dunno.
As far as the flying went, I think your CG at the back of the cross brace was right on. I needed about three clicks of down and two clicks of left and she flew straight and level. This airplane definitely has a presence in the air.
Haven't disassembled the gear yet to learn the extent of the damage. I think it will be fairly simple to repair. I also noticed one of the door hinges that broke was the really small one on the left main door. I've not seen these available anywhere in the after market. This could be a challenge to locate one.
It appears Murphy's Law is still valid. On the 41st. cycle, which also happened to be the maiden flight, the line burst. Why didn't it burst on the 39th. cycle on the ground?
Rob
F15driver
03-28-2011, 12:06 AM
#504
Join Date: Dec 2004
Location: PlaistowWest Sussex, UNITED KINGDOM
Posts: 418
Received 0 Likes
on
0 Posts
RE: Jetlegend Mig 29 Fulcrum
Rob,
My bubble was in a 3mm line from the main gear where it rubbed on the fuselage. The other thing I have noticed is that when the model is in the air the main gear turns and retracts against the airflow, this in turn must load the system up much more than on the ground. I get airborne and throttle back until the gear is away.
John
My bubble was in a 3mm line from the main gear where it rubbed on the fuselage. The other thing I have noticed is that when the model is in the air the main gear turns and retracts against the airflow, this in turn must load the system up much more than on the ground. I get airborne and throttle back until the gear is away.
John
04-11-2011, 02:17 PM
#509
My Feedback: (51)
RE: Jetlegend Mig 29 Fulcrum
My Mig 29 will be ready soon and i would like to ask you guys:
1. whats the recommended control throws ?
2. recommended CG is at the back of the main wing cross bar, right ?
3. Did you put any ballast weight in the stabs ? with Hitec 7955 servos i get a buzz in the servos and stab, probably because the stab's trailing edge is heavy..
4. Did you mount the end of the pipe about 5-10mm inside the tail cone like JL recommends in the plan ?
5. did anyone mount a P-160 in the Mig ? if so can you post pics ? it seems that with the above pipe mounting the engine would have to go forward a lot, and probably the starter would have to protrude through the front of the inlet ducting.
1. whats the recommended control throws ?
2. recommended CG is at the back of the main wing cross bar, right ?
3. Did you put any ballast weight in the stabs ? with Hitec 7955 servos i get a buzz in the servos and stab, probably because the stab's trailing edge is heavy..
4. Did you mount the end of the pipe about 5-10mm inside the tail cone like JL recommends in the plan ?
5. did anyone mount a P-160 in the Mig ? if so can you post pics ? it seems that with the above pipe mounting the engine would have to go forward a lot, and probably the starter would have to protrude through the front of the inlet ducting.
04-11-2011, 10:14 PM
#510
Join Date: Oct 2002
Location: Leeds, UNITED KINGDOM
Posts: 1,449
Likes: 0
Received 11 Likes
on
8 Posts
RE: Jetlegend Mig 29 Fulcrum
Here is a picture of Jeff Sewells installation with a Wren 160. I am fitting a Merlin 160 in mine and my starter will have to protrude throught the centre of the intake ducts. I alsways statically balance my stabs. Others don't bother. Moot point!
04-11-2011, 11:55 PM
#511
My Feedback: (51)
RE: Jetlegend Mig 29 Fulcrum
ORIGINAL: JohnMac
Here is a picture of Jeff Sewells installation with a Wren 160. I am fitting a Merlin 160 in mine and my starter will have to protrude throught the centre of the intake ducts. I alsways statically balance my stabs. Others don't bother. Moot point!
Here is a picture of Jeff Sewells installation with a Wren 160. I am fitting a Merlin 160 in mine and my starter will have to protrude throught the centre of the intake ducts. I alsways statically balance my stabs. Others don't bother. Moot point!
1. Is the Wren 160 shorter in length than the P-160 ? seems like it.
2. are everyone having to mount the batteries so far back in order to achieve the correct CG ?
04-25-2011, 02:21 PM
#514
My Feedback: (51)
RE: Jetlegend Mig 29 Fulcrum
ORIGINAL: i3dm
My Mig 29 will be ready soon and i would like to ask you guys:
1. whats the recommended control throws ?
2. recommended CG is at the back of the main wing cross bar, right ?
3. Did you put any ballast weight in the stabs ? with Hitec 7955 servos i get a buzz in the servos and stab, probably because the stab's trailing edge is heavy..
4. Did you mount the end of the pipe about 5-10mm inside the tail cone like JL recommends in the plan ?
5. did anyone mount a P-160 in the Mig ? if so can you post pics ? it seems that with the above pipe mounting the engine would have to go forward a lot, and probably the starter would have to protrude through the front of the inlet ducting.
My Mig 29 will be ready soon and i would like to ask you guys:
1. whats the recommended control throws ?
2. recommended CG is at the back of the main wing cross bar, right ?
3. Did you put any ballast weight in the stabs ? with Hitec 7955 servos i get a buzz in the servos and stab, probably because the stab's trailing edge is heavy..
4. Did you mount the end of the pipe about 5-10mm inside the tail cone like JL recommends in the plan ?
5. did anyone mount a P-160 in the Mig ? if so can you post pics ? it seems that with the above pipe mounting the engine would have to go forward a lot, and probably the starter would have to protrude through the front of the inlet ducting.
This thread seems to have gone to sleep - my Mig 29 will fly in a week or so - can you guys advise the recommended control throws ?
05-16-2011, 05:49 AM
#522
My Feedback: (51)
RE: Jetlegend Mig 29 Fulcrum
For those interested, here are some more videos of my MIG-29:
Maiden flight (in 15 knots cross wind
) :
[youtube]http://www.youtube.com/watch?v=nl0EL3FEbT0[/youtube]
flight #2:
[youtube]http://www.youtube.com/watch?v=qeHSyPkYt1w[/youtube]
flying with some SM Viperjets (with Nessy Gil and Yossi Shveka):
[youtube]http://www.youtube.com/watch?v=xlWxt8ufiek[/youtube]
Maiden flight (in 15 knots cross wind
) :[youtube]http://www.youtube.com/watch?v=nl0EL3FEbT0[/youtube]
flight #2:
[youtube]http://www.youtube.com/watch?v=qeHSyPkYt1w[/youtube]
flying with some SM Viperjets (with Nessy Gil and Yossi Shveka):
[youtube]http://www.youtube.com/watch?v=xlWxt8ufiek[/youtube]
10-02-2011, 05:18 AM
#523
Join Date: Nov 2005
Location: Cork, , IRELAND
Posts: 46
Likes: 0
Received 0 Likes
on
0 Posts
RE: Jetlegend Mig 29 Fulcrum
Dear Bart
Your advise on the hydraulic conversion is very helpful. Could I ask you just to list all the the extra festo items and quantity of each you suggested to, have the unit working correctly.
Thank you
JB
Your advise on the hydraulic conversion is very helpful. Could I ask you just to list all the the extra festo items and quantity of each you suggested to, have the unit working correctly.
Thank you
JB
10-02-2011, 06:07 AM
#524
My Feedback: (51)
RE: Jetlegend Mig 29 Fulcrum
Some more of the JL Mig-29...
nice landing:
[youtube]http://www.youtube.com/watch?v=XFoCQ5gJ6LI&feature=channel_video_title[/youtube]
some lights from details4scale:
[youtube]http://www.youtube.com/watch?v=wU4lRa216rw&feature=channel_video_title[/youtube]
simulated after burners also from details4scale:
[youtube]http://www.youtube.com/watch?v=lMSa97h4fKI&feature=channel_video_title[/youtube]
I also installed navigation lights (on fins and wing tips) - no video yet...
nice landing:
[youtube]http://www.youtube.com/watch?v=XFoCQ5gJ6LI&feature=channel_video_title[/youtube]
some lights from details4scale:
[youtube]http://www.youtube.com/watch?v=wU4lRa216rw&feature=channel_video_title[/youtube]
simulated after burners also from details4scale:
[youtube]http://www.youtube.com/watch?v=lMSa97h4fKI&feature=channel_video_title[/youtube]
I also installed navigation lights (on fins and wing tips) - no video yet...
10-02-2011, 12:33 PM
#525
My Feedback: (1)
Join Date: Jul 2005
Location: hull, UNITED KINGDOM
Posts: 712
Likes: 0
Received 0 Likes
on
0 Posts
RE: Jetlegend Mig 29 Fulcrum
Hi,
I've now logged about 40 flights on my MIG and am really enjoying it. Feels locked in and very smooth and easy to land.
Mine is using the 'updated' retract system with the secondary locking cylinder. There has only been a couple of issues with them failing to lock up or down; one were one of the mains snagged on a loose pipe (my fault) and another with a problem with the nose door.
I have filed the peaks on the slots on the side frames on the secondary cylinder slightly, as the main cylinder can lock the system under higher pressures. This happens when the main cylinder applies force on the secondary locking pin and this pin cannot withdraw over the peaks of the locking mechanism whilst under high load.
The only other thing that this system needs is to be kept clean and lubed properly, as part of regular servicing.
Cheers
Jeff
I've now logged about 40 flights on my MIG and am really enjoying it. Feels locked in and very smooth and easy to land.
Mine is using the 'updated' retract system with the secondary locking cylinder. There has only been a couple of issues with them failing to lock up or down; one were one of the mains snagged on a loose pipe (my fault) and another with a problem with the nose door.
I have filed the peaks on the slots on the side frames on the secondary cylinder slightly, as the main cylinder can lock the system under higher pressures. This happens when the main cylinder applies force on the secondary locking pin and this pin cannot withdraw over the peaks of the locking mechanism whilst under high load.
The only other thing that this system needs is to be kept clean and lubed properly, as part of regular servicing.
Cheers
Jeff