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3W Bearcat with Moki 300

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Old 12-07-2017, 11:33 PM
  #226  
tmac48
 
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Detlef if you don't mind my asking where did you get the rod ends from?
Regards Tmac 48
Terry McCleary.
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Old 12-12-2017, 07:08 AM
  #227  
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I never did post the video of my answer to the scale gear delimma:


7075T6 cross beams. Iíve added a bunch of lightning holes in them since this video. Very robust.

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Old 12-24-2017, 11:06 PM
  #228  
Detlef Kunkel
 
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Originally Posted by tmac48 View Post
Detlef if you don't mind my asking where did you get the rod ends from?
Regards Tmac 48
Terry McCleary.

Terry,

sorry for my late answer. Missed to join here for a while.
These types of ball and socket joints are available in thousands of versions. These here feature M5 threads and a 5 mm hole in the ball.

In case you have more questions dont hesitate to ask :-)
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Old 12-31-2017, 12:43 AM
  #229  
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Originally Posted by Detlef Kunkel View Post
Terry,

sorry for my late answer. Missed to join here for a while.
These types of ball and socket joints are available in thousands of versions. These here feature M5 threads and a 5 mm hole in the ball.

In case you have more questions dont hesitate to ask :-)
Thanks for that, I 'am looking for the male rods 4mm thread with 4mm ball hole and male rods with 3mm thread and 3mm ball hole.
Do you think these are available?
Regards Terry Mac.
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Old 12-31-2017, 02:12 AM
  #230  
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Terry,
thats pretty easy for M4. Takes 2 minutes to find a lot of, available in any material ( Plastic Aluminium steel...)
M3 in Steel seems a bit more difficult with male thread



Originally Posted by tmac48 View Post
Thanks for that, I 'am looking for the male rods 4mm thread with 4mm ball hole and male rods with 3mm thread and 3mm ball hole.
Do you think these are available?
Regards Terry Mac.
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Old 01-01-2018, 01:09 AM
  #231  
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Smile

Found one in a ebay shop here.
Let me know if I can help any further


Happy new year to everybody
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Old 01-01-2018, 03:02 AM
  #232  
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Originally Posted by Detlef Kunkel View Post
Found one in a ebay shop here.
Let me know if I can help any further


Happy new year to everybody
Many thanks mate, Don't know how many times I have tried to find 3&4 mm rod ends in the past with no luck but now they are showing up. Found some that are ridiculously expensive and some that are well within my price range,thanks for your trouble. Will order a couple of dozen of each while they are available!
Regards Terry Mac (tmac48)
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Old 01-01-2018, 05:08 AM
  #233  
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Terry,
youre welcome

no big thing at all



Originally Posted by tmac48 View Post
Many thanks mate, Don't know how many times I have tried to find 3&4 mm rod ends in the past with no luck but now they are showing up. Found some that are ridiculously expensive and some that are well within my price range,thanks for your trouble. Will order a couple of dozen of each while they are available!
Regards Terry Mac (tmac48)
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Old 01-01-2018, 05:18 AM
  #234  
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Btw coming back to our Bearcat gear.

I had planned to do all the drawings in my Christmas Holiday, and so I did for 3 days. Filled a lot of paper ( 20 all together) with all the drawings and details.
Now a friend is going to convert them in a CAD program file. I guess it will take him at least the same time.

Then we will order one set in a professional 3D printed version, just to be sure that everything fits as it should, before we are going to have the parts machined.

You see, it can be a long way to go.

Would be much easier for me to make one set on my machines at home, no question. The Cat would propably be standing on ist legs by this time.
But then the other chaps would have none, and I cannot produce the parts in serial production on my conventional machines.

btw there is one well known company interested in making the parts, not sure if they are talking about a few sets (for us only) or as a commercionally available product. We stay in touch to clearify the possible deal.

In case someone here was interested, let me know.
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Old 01-30-2018, 12:59 PM
  #235  
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Hi Detlef, any updates to your retract project?

Also, please check your PM.
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Old 02-24-2018, 04:55 AM
  #236  
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Originally Posted by ljsoarinson View Post
Hi Detlef, any updates to your retract project?

Also, please check your PM.

Yes, there is.

Good progress with the CAD design

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Old 02-24-2018, 11:14 AM
  #237  
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Delef.. this is really nice work. Looking fantastic!
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Old 06-20-2018, 03:03 AM
  #238  
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Originally Posted by rbgetz View Post
Delef.. this is really nice work. Looking fantastic!
Thank you Rob.
Progress is slow but steady.
We had a printed version made just to check everything in reality.
Resulting in some minor improvements and also some issues between the CAD-guy and my drawings.

Issues are being sorted out now.
Next step is to find someone for the machining for this pretty demanding parts.

Although not being ultra scale in detailling, this retract is sitting where it belongs, is as long as it belongs, and has the best geometry that fits this (too thin) wing.
I am more than pleased with the result, and happy that there are no other major issues.







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Old 06-20-2018, 05:06 AM
  #239  
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That looks really nice!!! You definitely have a talent for this..
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Old 11-24-2018, 06:45 AM
  #240  
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Hallo Detlef
Gibt's was neues in Sachen Fahrwerk?

Hi Detlef
Any news/ progress about the landing gear project?

Gruss/ greetings, Daniel
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Old 11-24-2018, 07:38 AM
  #241  
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Originally Posted by Swissy View Post
Hallo Detlef
Gibt's was neues in Sachen Fahrwerk?

Hi Detlef
Any news/ progress about the landing gear project?

Gruss/ greetings, Daniel


Daniel,

funny, exactly one hour ago I made the last touches on the printed Version. Where is your camera hidden in my shop???

The gear design is now finished.

We are going to look for some well eqipped machine shop with a four or better five axis millig machine center that will take care of the production.

My friend Mario will take care of that research, he already made some contacts to3 potential companies.

Then we will see if we can issue the production order soon, and -- at what price.


I myself guess the price range will be mortal
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Old 04-03-2019, 12:22 PM
  #242  
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SURPRISE!!! I'm back after getting sidetracked with a big old jet project:
but now I'm done so it's back to the Bear. But first I'm wondering how Detlef's gear is coming along? And how about Rob's Bearcat. Is it still chugging along?

I decided to tackle the wings first. This brings me to the hinges. This particular kit has a known problem with the hinges breaking inflight. Take a look at the first picture and you will see why. I could NOT believe what I found when I back lit the hinge with a flashlight - see the first picture. The manufacturer decided to put a big hole right in the most highly stressed part of the hinge: the base. And yes, they are all that way. I cannot imagine any reason for this other than possibly to align them on installation but what a BAD idea.

Both Rob and Detlef cut the old hinges out and replaced them (this on a $3K+ kit. . . . ). I chose a different course. I made a lay up of uni-directional carbon fiber with two layers of Kevlar (pic 2) and cut it into L-brackets. I then hysol'd them to the existing hinge bases (pic 3). The hinges are now indestructible.

Last two pics show gun blister removal. I was so happy when I flush cut them off to find the wing structure still intact - YAAAAYYY! No backing up big gaping holes. Just needed a little fill.

Now it's time to figure servo installation and control linkage.








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Old 04-03-2019, 11:54 PM
  #243  
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Good work with the hinges Mick.

Our gear stuck for a while because our manufacturer with the 5 axis machine let us down.

last week we found another shop who is willing to do the Job, so lets see if we are more successful this time.

The construction and CAD is 100% finished, its only the manufacturing.

I could do one set in my shop at home, but I am not going to make 3 or 4 .

It would be killing all my timing for other projects.

At the moment I am building up a batch of 6 Phoenix engines, and besides that, a big T-33 is being build for this season, demanding enough.
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Old 04-14-2019, 11:23 AM
  #244  
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Well, RCU took away my ability to edit the above post after about a day so hereís the vid link I was trying to paste up there. Sorry-

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Old 04-16-2019, 11:46 PM
  #245  
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Any news here?
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Old 05-04-2019, 04:12 PM
  #246  
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Iíve settled into a system of installing servos on these huge models by molding up carbon fiber cloth (6 alternating layers of heavy unidirectional CF) to mount the Servos on - using machined aluminum brackets. Light, strong, indestructible.




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Old 05-05-2019, 10:58 AM
  #247  
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There has been so much I didnít like about this kit but thereís no denying that it has some amazing features. Case in point: I set out to rig the flaps and ailerons today when something really cool jumped out at me. I was all set to rig in a bunch of differential aileron throw (to counter adverse yaw) when I realized the ailerons on this kit ( and the full scale??) are hinged so they drop an airbrake into the slipstream on the bottom of the upward deflecting aileron. NO ADVERSE YAW! So cool.




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Old 05-12-2019, 03:26 PM
  #248  
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Time to hook up the controls. But wait. Imagine installing a bulkhead in a flap that’s close to a foot down a tapering shell. And to top it off the inboard hinge is in the way so sliding the bulkhead down the inside of the flap is not possible. Just one more nearly impossible task on this 3W shell.

First picture shows the special tool kit it took to get it done. The wood dowel has a pencil lead on one end and wood screw threads on the other. I could just jam the bulkhead in around the hinge enough to screw the dowel into the bulkhead then slide it down into place ( about a hundred times for fit). Pencil was for marking hole for wood screw that holds the lever in place while Hysol sets. Second picture shows the setup prior to gluing - using special syringe rig.

Ailerons were much easier. I’d love to know how others have tackled this task . . . .







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Old 05-15-2019, 03:24 PM
  #249  
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So the flaps have a two foot long axle rod on the hinge line. The rod has to be guided thru the wing and flap hinges to secure them for operation. But how are you going to find the three sets of hinges with the flaps closed up on the ends? Guides of course.

Picture one shows the innermost guide - it finds the first hinge. Next guide is in the flap lever. That one sends the rod right thru the middle hinge and I found that the rod easily finds the last hinge from there. Second picture shows the only clue thereís a rod in there at all - the insertion holes.

I wonder how Rob and Detlef tackled this. . .hmmm





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