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3W Bearcat with Moki 300

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3W Bearcat with Moki 300

Old 10-17-2019, 04:29 AM
  #276  
mitchilito
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I couldnít find door cylinders online to fit my inner gear door needs so I had Sierra Giant Scale make me a set: 1/2X2 inch. Theyíre perfect. Darrell at Sierra does beautiful work.

if you look closely you can see where I mounted this cylinder first. It was too close to the hingline allowing flex. Bottom picture shows how new position results in much better triangulation.




Last edited by mitchilito; 10-17-2019 at 04:32 AM.
Old 10-20-2019, 01:19 AM
  #277  
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Default Finished:


Last edited by mitchilito; 10-20-2019 at 01:34 AM.
Old 02-02-2020, 04:02 AM
  #278  
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After a bunch of deliberation I decided to bolt the motor mount on instead of gluing. I attached servos and ignition to mount so the whole assembly is removable as a unit.










Last edited by mitchilito; 02-02-2020 at 04:16 AM.
Old 02-08-2020, 06:43 AM
  #279  
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So, engine is installed, cowl is mounted and baffling is installed. Cowl has 5 bolts holding it on: two flush bolts on bottom and three bolts that bolt in from the INSIDE of fuselage for invisible mounting.









Old 02-17-2020, 10:31 AM
  #280  
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Well, after 4 years the day has finally arrived. Itís time to close the hole in the fuselage for the smaller canopy. I have been dreading this literally for years! Didnít really know how to approach it but I think I figured it out: I used some very nice 1/32 basswood sheet to back up the hole. I covered this wood with release tape then glued it in place.


Old 02-17-2020, 10:36 AM
  #281  
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Then I used a light filler to fair the whole mess in to fuselage height. After sanding to blend in I covered with my green adhesive release film. I have used this process several times now and it has never failed to produce great results.


Old 02-17-2020, 10:43 AM
  #282  
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I then put a layer of 3oz glass a layer of 6 oz and a final layer of 3oz over it.
Old 02-17-2020, 11:55 AM
  #283  
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All that work for this little part!


Old 02-17-2020, 11:56 AM
  #284  
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Really getting close now.
Old 02-18-2020, 03:54 AM
  #285  
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I decided on a 7 inch spinner. Itís a compromise of scale looks and necessary cooling air access. Unfortunately it HAS to be smaller than the full scale Bear.

Couldnít find one to buy so Iím making one.

Old 02-20-2020, 04:06 PM
  #286  
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Default Rare Bear Spinner

Chucked a block of foam in the lathe and removed everything that didnít look like a spinner!



Getting close

Perfect!

Last edited by mitchilito; 02-20-2020 at 04:10 PM.
Old 02-27-2020, 12:12 AM
  #287  
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Reading your build brought back some fond memories. I lost mine on the third flight due to aileron flutter. It was the first time I really ran it at full throttle (3W-155 four cylinder). I saw the aileron buzz & the wing immediately exploded. Make sure all your control horns have extreme gluing surface area. There just isn't sufficient structure in any of the control surfaces. Awesome flying airplane up till then! Landed like a trainer.
Old 02-27-2020, 04:33 AM
  #288  
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Yep, these airframes are famous for flutter problems. Then to compound the problem 3W drills holes in the base of the hinges in the wing weakening them drastically. Crazy.

Iím going to take a number of steps to prevent flutter in general, including sealing the surface gaps, counterbalance etc.

Its going to be FAST with the Moki 300. Although probably not faster than your setup was. Main thing holding the Moki back is getting the right prop on it for max speed and my gorgeous SL 4 Blade is a beautiful compromise.

Last edited by mitchilito; 02-27-2020 at 04:36 AM.
Old 02-28-2020, 04:51 AM
  #289  
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Hereís the spinner plug after filling, sanding and a coat of blue spray. Ready for surface fiberglass.

Old 03-04-2020, 04:53 AM
  #290  
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Took a break from spinner work to install a bulkhead in back (the one on top). With the motor on and holding the plane in the cradle I could flex the tail more than I liked. Detlef said this would happen!! This aircraft with this engine is going to be FURIOUS at speed so itís best not to take any chances.
This small bulkhead is made from the same material as the rest: carbon-sandwiched foam. Super light and amazingly strong when installed. (Actually, the tailwheel bulkhead is carbon sandwiched ply).


Last edited by mitchilito; 03-04-2020 at 05:03 AM.
Old 03-04-2020, 05:00 AM
  #291  
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Nice work Mitch.

What a mess with the spinner...poor lathe


I was not too lazy with the main gear

After some calculating and testing I defined the 2 springs for the mains and made some test versions before I finally placed an order.

Today the ordered springs came, and so we can slowly reach the end of the Assembly stage.


I am going to paint mine all White- simply because I like the look very much
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Last edited by Detlef Kunkel; 03-04-2020 at 05:06 AM.
Old 03-04-2020, 05:12 AM
  #292  
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Those gear are gorgeous! So scale-like. That was a labor of love. As we can all guess, itís anybodyís guess how my gear are going to work 😳 although I have a good feeling about them.

Iím definitely envious.
Old 03-23-2020, 07:35 AM
  #293  
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Made the spinner mold out of Kevlar just because I have a bunch on hand. Iíd make the spinner out of Kevlar too but as Iíve said before it cannot be sanded - and I WILL be sanding this spinner.



Old 03-29-2020, 04:19 AM
  #294  
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I ordered 6 oz bias cut carbon cloth and cut in to 1/4 wedges. I then laid them in place dry and wet them out with a brush. Thereís just no way I could do a vacuum layup on this component. An important final step on every layup is to repeatedly scrape the brush dry and blot the layup until no more resin will come out. Yields surprisingly good results. This whole process would not be possible without the supple bias cut cloth.


Old 04-03-2020, 04:32 AM
  #295  
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Iím pretty happy with the outcome. Took some wet sanding to get smooth and a bunch of pinhole work yet to do. Itís huge but only weighs 7 ounces. FYI- starting from outside in: 2 layers 3oz bias glass then 3 layers 6oz bias carbon. I think thatís just right, structurally. Around 2mm wall thickness.



Last edited by mitchilito; 04-03-2020 at 04:59 AM.
Old 04-03-2020, 10:32 PM
  #296  
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Nice work Mitch.

Good to see other guys that also dont always go the easy way

Will be a very unique BC in the end :-)
Old 04-05-2020, 03:25 AM
  #297  
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Thanks Detlef. Thatís quite a complement coming from you.

Heres a little teaser just for the fun of it:



Old 04-06-2020, 11:02 AM
  #298  
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Who knew when I started this project it would be less of a hobby and more of a lifetime pursuit!!



Old 04-07-2020, 10:35 PM
  #299  
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Smile U/C progress

I am not too lazy either.

Found the time to paint the U/C. One will stay all metal, the other guy will paint his one White, too.


Lots of sanding, shaping, rounding all edges, covering all functional surfaces, etch primer applied and then a little darker toned white coat.

I didnt count the parts, must be over 30 or so



This U/C is soo sexy in White
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Last edited by Detlef Kunkel; 04-07-2020 at 10:48 PM.
Old 04-08-2020, 05:07 AM
  #300  
mitchilito
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Those gear are going to be fantastic. Canít wait to see them in a wing.

Hey Detlef, I would still love to hear more about your Moki 300 fuel induction mods. Can you tell us a little more about that?

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