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Royal Ki-61 Build

Old 02-18-2020, 11:56 AM
  #26  
Mtthwacrss
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Okay I know I have been off here for a while but I ran into a problem and haven't got it fixed yet. when I had the trailing edge done it all looked good then I put on the bottom trailing edge and let it dry over night and looked down the trailing edge and had a bout a 1/4 to 3/8" curve in the trailing edge. I have removed the sheeting and some of the ribs and have been trying to figure out if it is my board the wing spar or something else I have done wrong. I am still working on getting it right. When I get it figured out I will post an update and let you all know what I did wrong. until then if anyone has any ideas let them fly I appreciate all the help.
Old 02-18-2020, 12:10 PM
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Can be due to many reasons and without seeing how you did it, itís difficult to determine however...

Was the TE wood straight in the first place?
Was the TE well supported while the glue dried?
Was it a shrinking type?
Any change in humidity while it was drying?

My procedure sometimes when adding the second TE plank is to remove the structure from the board and re-pin it with a re-positioned jig spar, so that the complete TE area can be flat pinned to the board while drying (and I select straight wood in the first place, which is easy since I mostly scratch build anyway).
Old 03-13-2020, 07:06 AM
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I know I have been off here for a while but I have taken the wing apart and then wet the spars and clamped them in place while they dried out and now they are looking much straighter and no twist. I will try to get it all glued back together again this weekend. I will let you know how it goes.
Old 03-13-2020, 07:36 AM
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Good luck Matt I hope you found the solution.
Old 03-13-2020, 09:14 AM
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Just a bit of advice as you reassemble the wing. Along with the usual practice of pinning everything down or in place I also like to lay a yardstick spanwise across the wing ribs and weight it down to keep any unwanted twists from creeping in. It will help to keep everything in place until you get enough sheeting in place on the wing to lock it in place.
Old 03-16-2020, 06:19 AM
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Wing is back together. Still just a slight warp in trailing edge but I think I can get rid of it.

Old 03-19-2020, 05:59 AM
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leading edge sheeting is on and I think I might be able to make some head way this weekend. will try and post more pic this weekend.
Old 03-19-2020, 06:26 AM
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Sounds good Matt, good luck!
Old 03-27-2020, 12:11 PM
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Take a look at this and check me. I am pretty sure I have it right just want someone to back me up. Wish my uncle was still with us he build one of these back in the 70's. Let me know what you all think.


Old 03-27-2020, 12:15 PM
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Looks right.
Old 03-27-2020, 09:13 PM
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Originally Posted by Mtthwacrss View Post
Take a look at this and check me. I am pretty sure I have it right just want someone to back me up. Wish my uncle was still with us he build one of these back in the 70's. Let me know what you all think.

I am not quite sure what youíre asking about but note that the line you have marked on the tip block refers to hollowing that block.
It roughly indicates the Ďpocketí youíre supposed to carve out of that block.
To avoid frustration further on, the way I would do it is tack glue the tip block, carve and rough sand the outer surface to shape, then remove it from the wing and carefully hollow out leaving enough thickness so the tip doesnít become too flimsy.
Itís a trial and error process, work slowly.
Old 03-28-2020, 03:27 PM
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That is what I thought, but what is this other W13 part? I don't see it anywhere on the planes.


Old 03-28-2020, 08:01 PM
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Originally Posted by Mtthwacrss View Post
That is what I thought, but what is this other W13 part? I don't see it anywhere on the planes.
The tip block simply looks like it is laminated from W13 pieces, which is good because if you tack glue them to each other, then after rough shaping the tip you can take it apart and itís much easier then to hollow out the whole tip.
Old 04-09-2020, 03:47 PM
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Any updates? I'm planning on building this next when I finish my Royal P-51.
Old 04-17-2020, 06:24 AM
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Sorry have had more to do around the house than expected. I have the first wing tip shaped now and will post more later.
Old 04-17-2020, 07:31 AM
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Originally Posted by Mtthwacrss View Post
Sorry have had more to do around the house than expected. I have the first wing tip shaped now and will post more later.

My father in-law use to say if you like to stay busy buy a house then you will never be bored!
Old 04-20-2020, 06:14 AM
  #42  
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That is so true OKC.
Well here is my up date. i have finally got one wing tip tacked on and shaped. now i need to remove it and hollow it out some. I do have the second tip tacked on and will be starting to shape it this week. here are a couple of shots of the first wing tip.





Old 04-20-2020, 09:15 AM
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Good progress Matt! The wing tips look great!
Old 05-08-2020, 06:06 AM
  #44  
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Okay I know I have not done an update in a while. I have been busy with a very long honey do list and a little flying and fishing. Now that it is time to go back to work I have a question about retracts. I have been looking at the e flight sets but don't know which one to get the 85 deg. 90 or 95 deg.? Any help will as always be appreciated.
Old 05-08-2020, 07:43 AM
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Get one of those cheap plastic protractors like we had in school and put it on the plans flat side on the gear leg and let the plans tell you the angle.
Old 05-08-2020, 08:21 AM
  #46  
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If you look at a front view of the full-size Ki-61 you will note that the wing has dihedral and the gear leg is straight down. The 85 deg unit will most likely be best for achieving this configuration with your model. I had the Don Smith Ki-61 with 90 deg retracts. In order to keep them within the wing cross section while retracted they had to be splayed outward when extended. I got a deduct at every contest I entered. I had the Royal Ki-61many,many years ago.
Chuck
Old 06-22-2020, 09:33 AM
  #47  
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I know it has been a while since I posted. I received my landing gear and have been trying to figure out the best way to install them. I have also been flying and working outside lately. I want to get them mounted so I can get the wing put together. If anyone has some good ideas of how to make sure I get it right them please let me know. until next time keep them flying.

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