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F-16XL ARF by Global Knight Models from Global Jet Club

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F-16XL ARF by Global Knight Models from Global Jet Club

Old 03-31-2021, 05:02 AM
  #76  
FalconWings
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Jesus I was getting ready to get one, even put my remaining jet for sale to make space..........................I will wait it out.
Old 03-31-2021, 02:36 PM
  #77  
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Here are the CAD .stl files for the aux fuel tank.

It is listed in Thingiverse as: F16XL Extended Fuel Tank

https://www.thingiverse.com/thing:4812599



Old 03-31-2021, 03:44 PM
  #78  
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Install aileron servos


First was installing a servo plug on the pre installed extension wire. Male pins crimped on wires.


Connector housing over pins


Connector sleeve over pin housing


Screw holes drilled in hatch cover


Had to fuss with servo mounting bolts. The supplied bolts were hand cut to about 6mm and would not engage 3mm threads in servo L bracket. If you did not use the grommets and eyelets the bolt heads fell right through the holes in the servo mounting tabs. I used the grommets and eyelets to keep the bolts centered in the servo mount holes so I used 12 mm bolts. However the lower 12mm bolts interfered with the inside wood screw. So I cut them down to 8mm and all was well.


Servos mounted using the 6-32 nuts as spacers to keep the screws from punching through the upper wing skin.


Hatch cover installed. It is all flat so it does not fit the contour of the faring very well.


Other side is the side the same.


Hatch needs to be molded to fit he curves on the sides.


I got ready to install a servo tester to check the servo throws and discovered there was a female housing on the extension at the wing root. It is set up so that the elevator and aileron can not be cross connected but it was unexpected. Had to use a male to male extension to connect servo tester. This would complicate use of the multi plug connector I was thinking about using. I'll just stick to the preinstalled plugs.


I had to slightly grind a little clearance for the drive pin on both sides.


Rudder horn slot a little offset to the rear but not bad.


Rudder linkage was standard and no issue. I will either sleeve the threaded rod or replace with a pro link type rod.
Old 03-31-2021, 03:48 PM
  #79  
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Mystery flat spots


Flat area on bottom of both wings. Looks like it could have been a servo hatch cut out that was not used.




Same recessed flat spot on lower dorsal. I figured a future drag chute system may hide in here.

Old 04-01-2021, 05:11 AM
  #80  
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Wondering if Gary (@Jettech) or CM Jets can pull that 3d file and create a tank for you all..
Old 04-01-2021, 11:38 AM
  #81  
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Fabricating tank plumbing. PIcs are pretty much self explaining


Marking loation of feed tube. Pickup is in center rear of tank. Output goes vent on left saddle tank through the round hole.


Marked back edge of tank


Marked top view


Scrap 1/16" G10 used for tank fixtures. 15 x 15mm squares used for pick up tube stand off


Tube has to clear 5mm rib on back of tank


Two squares of G10 glued together with medium CA


The plot!


Hole drilled for tube


All gluing surfaces are scuff sanded inside and outside the tank


Scuff sanding back wall for standoff


Scuff sanding inside of tank. Outside done too


Top hole location marked away from back edge


Hole set for 5mm off the inside back wall


Drilled


Tubing dry fit and marked for cut.
Old 04-01-2021, 11:48 AM
  #82  
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Tank continued...


15 x 25mm G10 strain relief for top exit


Hole marked


Hole drilled and dry fit


Strain relief glued in with thin CA


Location of lower stand off dry fit


Lower stand off glued in with thin CA. No glue in stand off hole. This is a slip fit and allows the tube to move in the stand off during expansion and contraction.


Homemade tubing barb ready for solder


Finished barb


Final fit


Tank vent prepared the same way


Hole marked


Drilled


Strain relief glued in with thin CA


The final look


Test fit in jet


Parts glued in with Hysol


Care taken not to get glue inside the holes

Last edited by Viper1GJ; 04-01-2021 at 12:25 PM.
Old 04-01-2021, 12:39 PM
  #83  
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Plywood tank mount


Measured 25" around tank with overlap


Strip of 1" Velcro One Wrap will hold tank to mount. Both ends cut rounded to slide under the mount.


1/8" plywood parts four 1" x 3.5" and eight 1" x 1"


Parts glued together with medium CA


All done


Strap will fit in recessed area under mounts


Clear packing tape applied to bottom of tank and center line marked


Mount edges straighten on disc sander


Mounts tacked glued together with medium CA and kicker


Tape removed and all joints glued again.


After a little clean up sanding


Front view. I wish I had only cut out half of the center sections but got in a hurry and cut them both off.


Dry fit in fuse. Mount will be epoxied into bottom of fuse with Six10 epoxy


Bottom of tank dry fit of strap


Test fit on mount in jet. Seems to fit pretty good. I actually did these steps before I drilled the holes in the tank but I got the pics out of sequence.

Old 04-01-2021, 02:25 PM
  #84  
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Love your thread..always excellent building skills
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Old 04-01-2021, 02:44 PM
  #85  
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Epoxy inside the tank


I blew out any dust and wiped down the inside with acetone


After painting epoxy inside the tank I took care to clean out the holes. I used West Systems 105 and 206.


Tubes will be glued in with hysol before the tank is closed up


The inside track of the mount was coated. If there is a fuel leak here I don't want the wood to be a sponge


After coating the inside I flipped the rear section over and coated the rear face. After the tank is closed I will only have to coat the top and sides.

Last edited by Viper1GJ; 04-01-2021 at 04:40 PM.
Old 04-01-2021, 04:15 PM
  #86  
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Picture from today's flying the F16XL, I will link a video shortly.


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Old 04-01-2021, 04:38 PM
  #87  
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Closing up the tank


Fixed fuel tube and vent tube tacked in place with thin CA. Note there is no glue in the lower tube stand off because the tube is supposed to be able to flex and slip in the hole during flexing and expand and contraction.


Hysol applied to tube and tank joints inside and outside


Top of tank with fuel vent and fuel tube


After scuff sanding the tank joint again hysol was applied to the lap joint


A bead of epoxy was applied to both sides


The tank was closed and glue squeezed out all the way around. Looks like a good seal.


Excess scraped off with popsicle stick


Seam wiped with small squares of paper towel moistened with alcohol


Done for cure



Next step is to sand outside and apply fiberglass tape to joint line then coat the top and sides with epoxy.
Old 04-01-2021, 06:20 PM
  #88  
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Video from today.

Old 04-01-2021, 08:44 PM
  #89  
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Old 04-02-2021, 04:12 AM
  #90  
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Originally Posted by F900 View Post
I love this! Did you get any video from the drone?
Old 04-02-2021, 04:21 AM
  #91  
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Last steps on tank build


Fiberglass tape tacked in place over lap joint with thin CA. This is probably not necessary due to the PETG material and lap joint but it's traditional!


Tank tubes taped off to keep them clean. West Systems epoxy on top of mount and outside tank to seal any possible pin holes. Keith says its probably not necessary but just a precaution.
Old 04-02-2021, 04:13 PM
  #92  
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Tank Done!


I lightly wet sanded the tank surface with 220 grit wet sandpaper to smooth out the surface. Next step is glue in the tank mount.

Last edited by Viper1GJ; 04-03-2021 at 03:39 AM.
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Old 04-03-2021, 05:52 PM
  #93  
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Installing tank mount


I always drill drain holes anywhere in the jet that can trap leaking fuel or oil. Don't ask how I learned to do this.


Front hole


View from bottom


Scuff sanded inside the fuse where mount will sit


Scuff sanded bottom of tank mount


Wrapped a strip of plastic around tank strap to act as a release film so any epoxy that squeezed out and touched strap would not glue it in under the mount.


Applied tape loop strips to mount to hold in place on tank


Centered mount on bottom of tank and stuck it on with the tape strips


Wrapped strap around tank with plastic centered on mount and strap centered in the slot


Applied a thick layer of epoxy on front and rear sections of mount


Pressed tank into position centered and level with the top of the servo just behind the tank


Six hours later, Presto! Strap pulled out with no issues.


Tank mount done. In the final install I will put a piece of 1/8" craft foam I stole from my wife's craft supplies between the mount and the tank to give a little padding and vibration/shock insulation.


Was about ready to buy a pilot and I remembered this Tbird pilot I had for a project 20 years ago. I bought 2 at the time and this one is still in the box. Looks like this jet will have a red Tbird pilot.


Found missing part of the HUD that was broken in shipping. It was stuck in the nose gear well and fell out when I took out the nose gear.

This is the last work on the jet for a week. I have to pay some RC dues with a spring break trip with wife and grandkids. Hope to collect some needed parts while gone for the week. To be continued...

Gary
Old 04-07-2021, 02:45 PM
  #94  
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Nice looking Jet. did it come with a light controller? and will the gear/brake controller work the doors. I guess I should of asked these question, before I order one. please keep posting your build info and setups.
thanks
Terry G
Old 04-07-2021, 03:18 PM
  #95  
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In the meantime while you wait for Gary to come back quick video taken in flight from a drone. - I'll try get a better version with higher resolution

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Old 04-07-2021, 04:36 PM
  #96  
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Originally Posted by tmgreen64 View Post
Nice looking Jet. did it come with a light controller? and will the gear/brake controller work the doors. I guess I should of asked these question, before I order one. please keep posting your build info and setups. thanksTerry G
Yes it is a really cool looking jet. That's why I'm super excited about getting it flying. Besides looking so cool it is a really unique jet and very rare being modeled. There were only two full scale jets built in the early 1980s and they are both in storage now. And you can see from the videos it flies very well.

Here is a link to a PDF that has everything you may want to know about the real ones:

https://www.nasa.gov/sites/default/f..._in_flight.pdf

My jet came with JP gear/door controller and a JP brake controller. It also came with a small light controller. I will use the JP gear controller for the gear but I will use the sequencer in my Jeti Tx to control the gear doors. I will be using an AG63 Anti-sideslip brake and steering gyro controller from GJC for brake and steering.
I plan to use the supplied light controller if I can figure it out but there is no instructions included. It's just a PC board and connector pins. I'll post some pics of the controllers when I get back home in a couple of days.
Gary
Old 04-07-2021, 06:18 PM
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Gary, CHOP CHOP. You only have 7 weeks left to get this thing done for First-in-Flight. LOL. This thing looks awesome.


Josh
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Old 04-08-2021, 03:37 AM
  #98  
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Originally Posted by ifly3d View Post
Gary, CHOP CHOP. You only have 7 weeks left to get this thing done for First-in-Flight. LOL. This thing looks awesome.
Josh
Hi Josh,
Yes it does! That's the plan. Hopefully get it flying by end of APR. Looking forward to seeing all you at FIF.
Take care, see you then,
Gary

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Old 04-09-2021, 11:00 AM
  #99  
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Not to rerail Gary's build thread but I'm hoping my F-16XL will be ready for it's 1st flight next few days and before anyone asks lol both wing joints were strengthened with carbon along with the entire wing section were reinforced also with carbon and feels way better, rock solid.




Old 04-09-2021, 05:08 PM
  #100  
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HI F900,
Post #1 says "Anything F-16XL welcome here!" Bring it on! Do you have pictures of the CF mods to the wing joints and wing sections? Please post if you have them.

I am back home today. "RC dues" paid up for a little while and everybody had fun. Looking forward to getting some shop time tomorrow and starting my wing joint mods. I think the existing wing joint assembly is probably good enough but I'm not sure so I'm adding some insurance.

I plan to laminate the inside fuse skin around the wing tube sleeves in CF to strengthen the fuse skin and former joint. Then I plan to add a sub former above and below the wing tube sleeve to directly transfer loads from the wing tube sleeve to the airframe structure similar to what Paul suggested in post #49. I am considering tying both the front and rear wing formers together with either a wood rib between them or CF laminate on the inside of the skin to distribute the wing tube load path between each former and the fuse skin. TBD till I can get another look at the inside of the fuse.


I made contact with Mike and Ralph at GJC this week. I'm very impressed with the their willingness to help solve issues an receive recommendations for improvements. Mike told me that Global Knight is also wanting to make improvements to the F-16XL. I really like this jet and want it to be successful and hopefully some ideas from this thread can be rolled into follow on kits. Ralph told me the replacement fuse decals have been ordered so I will proceed with the grey repaint this week mentioned in post #3.

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