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JW Bker Jungmeister build

Old 08-13-2022, 02:35 AM
  #151  
mitchilito
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Fun times in the shop! You know you're getting close to finished when it comes time to mount the engine. I had envisioned a 1/2 inch thick piece of plywood as a mount but after I looked at the plans there was only a 1/4 of thickness available for a mount. Apparently the Moki 300 is longer than the 250. So I started looking around the shop for a suitable candidate. 1/4 inch aluminum plate would work fine but I didn't have a big enough piece. Then I ran into a piece of stock I've had kicking around for as long as I can remember. I have no idea where it came from.

This piece of material started life as a piece of high quality 7-ply plywood. But then the manufacturer took it and turned into what is best describe as a thick piece of phenolic. It was vacuum infused with a resin that looks, acts and SMELLS exactly like phenolic when you cut it (if you've ever cut phenolic you know what I'm talking about). Anyway, it's a fantastic candidate to be my thin, strong/stiff motor mount.

The only tricky part of the whole install was clearance for the 2-into-1 exhaust. The scant thickness of that mount didn't allow ANY clearance so I had to mill away most of the lower plywood ring of the fuselage front former. Structurally it's not a problem but it was quite a project. I stopped milling/sanding when I had about 3/8ths of clearance - not as much as I'd like but enough I think.



This material started out as 7-ply as you can see

Here's the motor mount. It's not the lightest choice but close to perfect, I think.



32X18 prop

Cover/paint is looming. As I said before, I'll be using Stewart systems to cover but final paint will be Klass Kote epoxy (it's more user-friendly than Stewart's final finish paint system)

Last edited by mitchilito; 08-14-2022 at 02:12 AM.
Old 08-13-2022, 03:34 PM
  #152  
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Is there any offset called for in the plans?
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Old 08-14-2022, 02:10 AM
  #153  
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Originally Posted by tmac48 View Post
Is there any offset called for in the plans?
tmac48
JW calls for no down or side thrust and I prefer not to have any. Instead, if needed, I will add a throttle to elevator mix instead of down thrust and I prefer to fly the rudder by hand.


Bottom front milled away for exhaust system. I re-glassed it after milling

Last edited by mitchilito; 08-14-2022 at 02:26 AM.
Old 08-14-2022, 04:43 AM
  #154  
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Originally Posted by mitchilito View Post
JW calls for no down or side thrust and I prefer not to have any. Instead, if needed, I will add a throttle to elevator mix instead of down thrust and I prefer to fly the rudder by hand.


Bottom front milled away for exhaust system. I re-glassed it after milling

That sounds good, a lot easier to mount the motor as well!
Old 08-16-2022, 03:40 AM
  #155  
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Whatever else one may say about the JW Bucker, it's flying qualities can never be doubted. Just watch this:

Old 08-18-2022, 05:52 AM
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Originally Posted by mitchilito View Post

This material started out as 7-ply as you can see

Here's the motor mount. It's not the lightest choice but close to perfect, I think.



32X18 prop (wrong!)
I need to make a correction here: the propeller I will be running on this Moki 300 is a 34x18 NOT a 32x18.
Old 08-25-2022, 07:02 PM
  #157  
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HI, have a couple of questions, received my kit today minus the cowl ( chasing it up) All instructions in German, no use to me, also the plan's do not appear to be full size, could you advise me of the length of the wing plan that you have and do you build directly over it? I have built a couple of 3rd scale Waco's and the plan's where a lot bigger!!
Anyway would appreciate if you could spread some light on this for me.
Regards Tmac. ( Just had another look at the plan's, they say 50%, guess I need to have them enlarged or do you just build from the gigs)

Last edited by tmac48; 08-25-2022 at 08:40 PM.
Old 08-26-2022, 02:43 AM
  #158  
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Just looking through your build thread again and saw that your plan says 1:1. I guess I will need to speak with JW. and see if they are in the post!!
Old 08-26-2022, 03:04 AM
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Originally Posted by tmac48 View Post
Just looking through your build thread again and saw that your plan says 1:1. I guess I will need to speak with JW. and see if they are in the post!!
I can't imagine you didn't get full size plans! Especially for the wing, which you need to build over. I'm guessing you didn't get your kit from Voglesang. The owner of that retailer provided me with a translated copy of the instructions which I will electronically send to you. I also have a "lacquered" copy of the wing plans to build over if you would like me to send them to you. Go back earlier in the thread and you will read how I prepped the wing plan (and also said I would send to any builder that wanted it).

Now that I'm thinking about it, there's one more. place you need a full size plan to build over: the wing strut bracing rods have to be glued up over the plans.

(Tmac I tried to send you a pm. Let me know if you get it.) I'm going on record right here to vent about how much I HATE the RCU message system. For whatever reason I can't ever see my sent items (even when I filter the date range appropriately)

Last edited by mitchilito; 08-26-2022 at 03:46 AM.
Old 08-26-2022, 05:28 AM
  #160  
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Yes Mitch got your PM and have replied with my email. If I can't get the full size plans then I will gladly pay you for a copy, let's wait and see what JW has to say.
regards tmac48.

Last edited by tmac48; 08-26-2022 at 05:34 AM.
Old 08-28-2022, 02:35 AM
  #161  
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Originally Posted by tmac48 View Post
Yes Mitch got your PM and have replied with my email. If I can't get the full size plans then I will gladly pay you for a copy, let's wait and see what JW has to say.
regards tmac48.
I'd be happy to send you my old tired (but usable) plans. I'll be done with them VERY soon.
Old 08-28-2022, 02:16 PM
  #162  
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Originally Posted by mitchilito View Post
I'd be happy to send you my old tired (but usable) plans. I'll be done with them VERY soon.
Thanks for the English instructions, still waiting to hear back from JW regarding the full size plans and the cowl and tail wheel. I must enforce some of your comments about the quality of the contents of the kit, superb!! I was up till 2am this morning sorting out a few of the items to build the centre sections, think I might start with them, would you see any complications that may occur by doing this?
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Old 08-29-2022, 05:40 AM
  #163  
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Originally Posted by tmac48 View Post
Thanks for the English instructions, still waiting to hear back from JW regarding the full size plans and the cowl and tail wheel. I must enforce some of your comments about the quality of the contents of the kit, superb!! I was up till 2am this morning sorting out a few of the items to build the centre sections, think I might start with them, would you see any complications that may occur by doing this?
tmac48.
I can't think of a reason not to build the center sections, although I started with the wings. You'll have to build the spars first of course.

NOTE: One warning to anybody building this kit: you can't always trust what JW wrote on the parts packaging: If it's marked "Fuselage" it may or may not wind up used for that. Just saying. . .. .

Last edited by mitchilito; 08-29-2022 at 05:47 AM.
Old 08-29-2022, 05:44 AM
  #164  
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I finished all the struts: 2 coats of Minwax Polycrylic followed by two coats of Klass Kote white primer - sanding between each of the 4 coats of course. I'm ready to glue them up and rig the entire aircraft.

Pic shows metal parts I have to prime now.


Items on top will wind up yellow, items on the bottom will be black.
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Old 09-03-2022, 04:17 PM
  #165  
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Mitch can the servos be fitted in the wings after they are covered? Looks like there is not much room in there.
Old 09-04-2022, 02:10 AM
  #166  
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Originally Posted by tmac48 View Post
Mitch can the servos be fitted in the wings after they are covered? Looks like there is not much room in there.
Im not sure if they could or not. I installed all my wing servos as I built the wings.
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Old 09-05-2022, 12:21 AM
  #167  
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Originally Posted by mitchilito View Post
Im not sure if they could or not. I installed all my wing servos as I built the wings.
Thanks for that,I will see if I can install them after covering,if not will do as you .
On another note, I have been able to get the full size plans printed in AUS and also had the wing done in a mirror image so have a left and right to build over. Once again thank you for the offer of yours. One more thing,a quick look at the root ribs it appears that if I build the wings as the root and seconad ribs are supplied then the dihedral of all four wings will be the same when I believe the build instructions call for the top wing to be +1 1/2 and the bottom at +3 deg. Can you possible remember if you had any complications with this area?
( The four root ribs and the next four with the holes for the 12 mi aloy tubes are identical!!!) IE WILL ALL PRODUCE THE SAME DIHEDRAL.

Old 09-05-2022, 04:27 AM
  #168  
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I think I had better get some sleep and carefully go over the plan again!!. I think I see where I went astray, some of the dihedral on the bottom wing is half arrived from the middle section and the top wing gets its dihedral from the wing only, is this correct? anyway will revisit it again in the morning,good night.



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Old 09-05-2022, 05:43 AM
  #169  
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Terry, its been a long time since I built the wings but Im pretty sure the wing panels have no dihedral built in. Pretty sure its all in the center sections.

BUT like I said its been a looooong time since I built them. . . .

The build jigs should show you tho-

Last edited by mitchilito; 09-06-2022 at 01:48 AM.
Old 09-05-2022, 11:42 AM
  #170  
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Originally Posted by mitchilito View Post
Tom, its been a long time since I built the wings but Im pretty sure the wing panels have no dihedral built in. Pretty sure its all in the center sections.

BUT like I said its been a looooong time since I built them. . . .

The build jigs should show you tho-
Thanks.
Tmac48(Terry Mac )
Old 09-05-2022, 02:24 PM
  #171  
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Well I knew a good night's sleep would do the trick!! After going over the plans again there it was in black and white. The four wings have all got 1'5 dihedral and the bottom centre section has 1'5 giving the bottom wing a total of 3 deg dihedral.
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Old 09-06-2022, 01:47 AM
  #172  
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Im glad you got to the bottom of that, Terry 😊
Old 09-06-2022, 01:56 AM
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Originally Posted by mitchilito View Post
Im glad you got to the bottom of that, Terry 😊
Thats better Mitch .
Old 09-08-2022, 02:44 AM
  #174  
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Mitch you would be kind enough to post a few pics of the upper centre wing section, need some clarification regarding the trailing edge assembly. Looks like an awful amount of sanding in the hand hold area!! Thanks in anticipation.

Last edited by tmac48; 09-08-2022 at 02:47 AM.
Old 09-08-2022, 09:06 AM
  #175  
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Originally Posted by tmac48 View Post
Mitch you would be kind enough to post a few pics of the upper centre wing section, need some clarification regarding the trailing edge assembly. Looks like an awful amount of sanding in the hand hold area!! Thanks in anticipation.
It looks like a lot of sanding because it IS a lot of sanding


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