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CARF-Models Mig 17 build thread

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CARF-Models Mig 17 build thread

Old 05-30-2022, 11:48 AM
  #101  
Dave Wilshere
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Picking away at mine now other things behind me.










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Old 05-31-2022, 12:48 PM
  #102  
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Servo arm position for the main gear doors needs to be like this, all the load is when the doors are closed, so the pushrod needs to pass over the servo arm screw. When the door is open in the airflow ( door sits almost vertical) there is almost no G or airflow load.
This is just a geometry check, Iím going to use metal arms.


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Old 06-03-2022, 10:45 AM
  #103  
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Landing light hole cut and made 100% circular. Laser cut clear lens. Layers of glass paper added to tin, the overhang allows a feed in to start sizing.
I added more layers to get a clearance hole





Old 06-03-2022, 12:31 PM
  #104  
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Dave,

Are you not doing the uniLight kit installation on your MiG?

Also, for the cylinders used on the speed brakes, was that part of your kit? I did not receive those.

Thanks!
Old 06-03-2022, 01:00 PM
  #105  
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Yes, I got the Unilight set. I noticed looking at the FS early on how prominent the glass lens landing light was…I also decided the 50mm light was too small. That started a stupid idea to increase the diameter and add a clear lens over. It’s been a whole lot of work.
But making the hole is valid what ever the dia.
No the dummy cylinders was something I just did along with the after burner pipe work detail I decided to add. The cylinders are CARF items I had spare, they are the ones they supplied after the Robart 165 became too expensive.
Old 06-03-2022, 01:31 PM
  #106  
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Got it, thanks Dave. I'm working on the lighting system in the wings and tail right now. I agree this is a lot of work for some reason. Also, my Black.4 servo lead to the receiver broke at the board only after handling it a little bit on the bench. I contacted uniLight via there website about it and Ulrich got back to me right away about how to take it apart and solder the wires. Looking at the way they soldered the wires to the board they didn't tin or include flux on the ends of the wires. I redid each one under magnification reassembled it and the unit is working fine so far. Very impressed with the help from uniLight on this.
Old 06-04-2022, 12:38 PM
  #107  
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The new definition of a "lot of work" is so funny .... a BVM wood wing F- 86, or a Balsa Bandit, etc., were examples of lot's of work !!!!

BTW, this is just a joke ....

Jack
Old 06-04-2022, 01:01 PM
  #108  
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I have finally received all parts of my kit.
All the great things that have been said are spot on !! Spectacular work Andreas.

So far the only thing that I have modified is the wing LE section of the fuselage. It is way too soft for my liking .... I tend to grab the fuse by that area when moving it around.
I made an opening at the root and reinforced the inside of the skins with heavy CF, also added a rib at about half way between the root and the fuse (can't work from inside the fuse because the inlet duct is in the way). Feels rock solid now.

Jack
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Old 06-04-2022, 03:30 PM
  #109  
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Originally Posted by jackdiazccs View Post
The new definition of a "lot of work" is so funny .... a BVM wood wing F- 86, or a Balsa Bandit, etc., were examples of lot's of work !!!!

BTW, this is just a joke ....

Jack
I could build a BVM wing quicker! You donít have to think with BVM kits, start at page 1 and when you reach the back page itís ready to fly.
There might be lots of bits, but they all fitted 😁
Old 06-04-2022, 07:57 PM
  #110  
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Default Wing Nav Lights

Finished up the wing nav lights and wiring out the wings. It went smoothly however I had to make some minor modifications to the uniLight cooling fins. After slotting the wing tips with a Dremel and file, I test fit the lights and found they didnít go all the way in. Something inside the wing was blocking them, and additional 4-5mm was needed. Looking through the slots with a flashlight, I could see the issue. I also used a small file to check the structure. There appears to be carbon fiber ribs at some angle preventing them lights from going completely in. I ended up cutting away a few millimeters off the end of the cooling fins. After that they went in fine. Used a small amount of epoxy to glue them in as well as the clear covers. I secured the wiring with tie wraps inside the wing. I did have to extended the wires from the lights out the wing with some PowerBox wire. I will reuse the short portion with the uniLight connectors I cut off inside the fuse. I will need to make a wire harness out of it in order to connect everything up from the wings and tail.



Slot and modified nav light

Nav light

Nav light

Nav light

Attached nav light

Inside view (via aileron location) of attached nav light
Old 06-05-2022, 03:17 AM
  #111  
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My early kit had carbon fibre hatches on the wings, so was missing detail. Iíve burnt in rivets and then oil painted.







Old 06-05-2022, 10:17 AM
  #112  
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Flaps matched. Wings joined with spars, first wing completed with my desired flap angles. Second wing matched to first. I donít measure deflection preferring to eye standing on the centre line.
Full flap has pushrods inline with servo horn at full flap to reduce load.
As always with my builds the PB, Rxís, batteries, switch etc are all for the model-so by the time of the first flight there will be 50+ cycles through the system






Old 06-09-2022, 09:50 PM
  #113  
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Default Nav tail and pass through holes

Managed to get the nav light installed in the tail. After some sanding I realized it wasnít going to fit. In order to save as much material as possible surrounding the nav light assembly I had to file grooves in the aluminum to accommodate the red and black wires. Worked out perfectly. Also I used an extension rod with a drill bit on the end in order to drill a pass through hole into the fin. This will allow the wires to make it inside the fin and on to the exit at the fuselage for connection. Lastly I drilled the pass through holes on either side of the fin for the elevator servo leads. I did run into some wood and hysol in that area so be careful when you make the openings.



Nav light assembly with grooves

Nav light with tucked wires

Nav light fully inserted

Extension rod with drill bit

Extension rod with drill bit showing required depth

Elevator servo lead hole
Old 06-11-2022, 07:08 PM
  #114  
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Default Control surface linkage update

I came across a good suggestion by one of the contributors in the CARF Rebel thread the other day and decided to update my control surface linkages with his advice. CARF provides a pin and c-clip for connecting the linkage to the control surface horn. Itís very nice , but apparently the c-clip can be easily removed with a small amount of force especially if it snags on something like a wing bag. So I changed it to a M3 button head screw and nyloc nut.



Updated aileron linkage
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Old 06-11-2022, 07:33 PM
  #115  
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Default Landing light install

Finished up the tail nav light and servo leads for the elevators and then moved on to the landing light install today.

I opened up the uniLight landing light packaging and began looking over the parts. Itís very nice however I noticed right away it needed some adjustments. The servo was pre installed but it was facing the wrong way. Disassembled it from the frame and then reinstalled it correctly. Attached the servo arm and the linkage and did some bench tests with my radio. All looked good.

Next I cut into the wing to get better access to install the light assembly as well as cut the opening for the light to deploy out from. Did a quick fit check and noted some things I may need to do before glueing it in permanently. During the fit check the landing light became unglued from the frame. Iím not sure what kind of glue they used but it seemed inadequate. Something like this should be screwed down as it deploys into the airstream. Iíll look at this a bit more this coming week.


Landing light assembly top view

Landing light bottom view after opening packaging

Surface marks prior to drilling out

Dremel openings in wing

View through new opening to help with install

Landing light assembly with opening in wing

Alternate view of the landing light assembly

Test fit of the landing light

Deployed landing light test fit

Landing light test fit front view

Delaminated landing light
Old 06-11-2022, 09:50 PM
  #116  
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Originally Posted by Airforce7 View Post
I came across a good suggestion by one of the contributors in the CARF Rebel thread the other day and decided to update my control surface linkages with his advice. CARF provides a pin and c-clip for connecting the linkage to the control surface horn. Itís very nice , but apparently the c-clip can be easily removed with a small amount of force especially if it snags on something like a wing bag. So I changed it to a M3 button head screw and nyloc nut.



Updated aileron linkage
You have used a screwÖwith threads. It will wear the holes and you will get slop.

itís only valid if you can find a bolt with smooth section to use.

My model will have the supplied pins and clipsÖ
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Old 06-12-2022, 10:50 AM
  #117  
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Originally Posted by Airforce7 View Post
I came across a good suggestion by one of the contributors in the CARF Rebel thread the other day and decided to update my control surface linkages with his advice. CARF provides a pin and c-clip for connecting the linkage to the control surface horn. Itís very nice , but apparently the c-clip can be easily removed with a small amount of force especially if it snags on something like a wing bag. So I changed it to a M3 button head screw and nyloc nut.



Updated aileron linkage

I have hundreds of flights on my CARF fleet, including vibrating planes like P-47 or Corsair, with 250's Moki.
They use the pin and clip system you mentioned. I have never had a problem with them.
Advise: beware of experts ..... they are extremely dangerous

Jack
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Old 06-12-2022, 11:12 AM
  #118  
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This is to avoid the dozens of wing cables from been entangled with the light mechanism.
Height is critical to pass thru the root opening.

Jack





Old 06-12-2022, 03:12 PM
  #119  
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Dave, Jack,

Thanks for the feedback on using M3 threaded screws verses the CARF pins. I think itís probably OK to use them as you pointed out, but I ended up sourcing some M3 shoulder screws cut to size. Used some thread locker as well to finish assembling the control linkage. Picture below.



M3 shoulder screw cut to length
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Old 06-12-2022, 03:17 PM
  #120  
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Originally Posted by jackdiazccs View Post
This is to avoid the dozens of wing cables from been entangled with the light mechanism.
Height is critical to pass thru the root opening.

Jack


Thats a good idea Jack. Iím not sure Iíll do exactly that, but you pointed out something that needs attention in regards to securing the servo leads in that area and into the fuselage.
Old 06-12-2022, 10:35 PM
  #121  
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Default Landing light preliminary test fit

Worked on the landing light a bit more today and decided to redesign the servo mounting. I had originally set it up the way CARF had shown in some pictures I received. When I went to test fit it inside the wing again I noticed that the light was not centering correctly which would cause it to deploy more towards the fuselage.

Turns out the back corner of the servo was hitting the main support structure near the hole where the servo leads exit. I studied the CARF photos more closely and saw that they hacked away some material in that area to allow the servo to move further into the wing. Weíll I didnít want to do that and opted for mods on the light assembly.

All the mods still allow for servicing and especially the LED light, I drilled two holes and tapped them for 2-56 socked heads screws in case I need to take it out for any reason.

Finally, I put a couple of dabs of hot glue on the mounting plate and installed it in the wing to do some testing before permanently gluing the entire assembly. I took a short video and some pictures. Any comments on this are welcome.


Light assembly bottom view

View of the landing light mods

Another view of the landing light mods

Landing light mounted with screws

Landing light retracted

Landing light deployed

Light assembly in the wing

View inside wing towards light

View inside wing toward servo

Another view of the landing light in the wing



Last edited by Airforce7; 06-12-2022 at 10:43 PM. Reason: Grammar changes
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Old 06-16-2022, 01:57 PM
  #122  
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Default Landing light trim and new video

Last post on the build for a while. Added some flight metal around the opening to give it a more scale appearance. Took a new video from a different angle. Slowed the deploy and retract down a bit. Iíll likely move on to the rear fuse section next and install the AB rings and servo leads.


Still photo of the added detail around the opening

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Old 06-19-2022, 01:08 PM
  #123  
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Decided to add heat effect look.






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Old 06-21-2022, 09:51 AM
  #124  
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Made this tray to separate the cables from the nose gear.
Height and location are critical because of nose gear strut and servo.






Jack
Old 06-21-2022, 12:34 PM
  #125  
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How much stuff are you putting on the front tray? It quickly comes out nose heavy.

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