RE: Building a DUELIST MK 2 From Plans!  
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RE: Building a DUELIST MK 2 From Plans! - 3/12/2008 1:41:32 AM   
mred33


 

Posts: 267
Joined: 5/12/2006
From: Glenwood, GA, USA
Status: offline 		I love hinge points. I have been using them since they came out and will never go back. Love the drilling jig too. I use Gorilla Glue on mine and if you wype the foam off if any comes out while it is still soft, it is easy to clean the hinge points off. I have also had the same problem with using control horns on balsa, but I started using the type you are using through a peice of plywood that I put in the balsa just like you do and they work great. You can also shave a little balsa off both sides and epoxy 1/16" playwood in there and that works good for mounting the regular kind, but I use a bolt and nut on it and CA the nut so they don't come off. The build is looking great. Keep up the good work.
Ed

_____________________________

SOME PEOPLE ARE LIKE SLINKIES. NOT REALLY GOOD FOR ANYTHING, BUT THEY BRING A SMILE TO YOUR FACE WHEN PUSHED DOWN THE STAIRS

(in reply to CrateCruncher)
       Post #: 26

RE: Building a DUELIST MK 2 From Plans! - 3/12/2008 3:09:07 AM   
CrateCruncher



Posts: 629
Joined: 10/14/2005
From: Austin, TX, USA
Status: offline 		Right Ulf, the elevator halves were sanded down to 1/8" at the trailing edge. Ed, I love hinge points too but haven't tried foaming glues yet. Here is a pic of the wing. Look at all these ribs! The Pica version only has 10 per side, the MK 2 has 12. Everything fits great so far but I need to replace a couple of 1/4" sticks- too soft. I'm currently working on the reinforcements for the landing gear and nacelles. I'm leaning toward 1/16" ply to reinforce the ribs in these areas. I also am planning air lines for the retracts and servo extension routes through the wing.

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       Post #: 27

RE: Building a DUELIST MK 2 From Plans! - 3/12/2008 4:13:04 AM   
ulfenator


 

Posts: 39
Joined: 5/3/2003
From: Rochester, NY, USA
Status: offline 		Mike, are you building the whole wing in one piece or one half at a time?

I was planing on using spruce in stead of balsa for my wing spars, it might make it a little bit heavier but it will be stronger.

Ulf

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       Post #: 28

RE: Building a DUELIST MK 2 From Plans! - 3/13/2008 1:48:17 AM   
mred33


 

Posts: 267
Joined: 5/12/2006
From: Glenwood, GA, USA
Status: offline 		Gorilla glue is GREAT for hinge points. Take a peice of 3/8" balsa and drill a hole in it and then install a hinge point. After the gule sets, try and pull it out. If you ever try that, you will see why I use that glue for the points. It works great. Just make sure you clean the foam off the hinge line when it is soft as that is much easire then doing it after it sets up, but it's still not that hard. No where near as hard to clean up as epoxy is or even yellow glue, but the hinge points will never come out unless you rip something apart. Once they are in, they are there to stay. Try it once and you may never go back to the other glues. Doing great on the build also. Keep up the good work.
Ed

_____________________________

SOME PEOPLE ARE LIKE SLINKIES. NOT REALLY GOOD FOR ANYTHING, BUT THEY BRING A SMILE TO YOUR FACE WHEN PUSHED DOWN THE STAIRS

(in reply to ulfenator)
       Post #: 29

RE: Building a DUELIST MK 2 From Plans! - 3/13/2008 5:36:26 PM   
CrateCruncher



Posts: 629
Joined: 10/14/2005
From: Austin, TX, USA
Status: offline 		Well, I was going to build this wing in left and right halves, sheet them, then glue them together at the root as is customary.

I understand low-wing planes need some dihedral to offset their slight roll-instability but how much is enough and where does it begin to fight roll inputs from the pilot? I plan to knife-edge this plane and want it roll-neutral. I want some dihedral in the wing but think 4 degrees as designed is a bit excessive.


Looking back on one of my favorite planes of all time, the Bridi Kaos, I've noticed that with 2 degrees of dihedral the natural taper of the wing from root to tip makes the top surface flat! Just the surface I happen to have on my building board...

After giving it some thought I've come to think the easiest, strongest, and most accurate way to build this wing is full span, upside down.

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       Post #: 30

RE: Building a DUELIST MK 2 From Plans! - 3/21/2008 4:14:11 PM   
CrateCruncher



Posts: 629
Joined: 10/14/2005
From: Austin, TX, USA
Status: offline 		I've been working on the Duelist off and on now for the last week. The easy part is always ordering parts and supplies. Tower came through with the Robart retracts I wanted. They are Part #521W1 ti-gear with 3/16" mains and 5/32" nose gear. The nose gear mounts to the firewall on this set. Using my postal scale I estimate they will add 12 ounces over fixed gear.

I'm not crazy about the multiple piece fabricated canopy on the plan so I also bought a Great Planes P-51 Mustang replacement canopy #GPMQ2290 that looks like it was made for the Duelist MK2. I forget who mentioned this canopy in a previous Duelist thread but they were spot-on.

The build has slowed down a bit because of the wing. I take pride in not worrying over the little stuff that doesn't matter. However, the wing being straight matters. After jacking with this one panel for a week I finally have it in a straight enough alignment I feel I can begin to glue. Why so long? Well, the ribs are drawn in groups, odds and evens. When laid out on the plan the odds are 1/16" shorter than the even numbered ribs in front and evens are too short in back. Shims - next. The wing panels are 1/4" difference in length. OK, reposition the last rib so they match - next. The leading edges bowed when I cut them from a straight piece of sheet stock. Replace the wood - next. The rib leading edges and trailing edges don't align. Average them and sand/shim the outliers - next......You can see from this paragraph I've gotten a taste of Murphy's law this last week and it sure is frustrating.

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       Post #: 31

RE: Building a DUELIST MK 2 From Plans! - 3/21/2008 8:10:44 PM   
ulfenator


 

Posts: 39
Joined: 5/3/2003
From: Rochester, NY, USA
Status: offline 		>>You can see from this paragraph I've gotten a taste of Murphy's law this last week and it sure is frustrating.>>
Yes, that is why we call it modeling......

Thanks for the information about the canopy, I didn't care for the looks of the original canopy on the plans either.

I got a sneaky suspicion about the ribs on my plans, when I was tracing them out and cutting the rib temlates the countor of the ribs at the main spar doesn't quite lign up right on some ribs, I think when I copied the plans it possibly got distorted a little bit.
I have already made my ribs out of 1/8" balsa so I'm sure I'm going to have the same problem as you with the ribs being short also.

I have an old set of Rohm Air Retracts that has never been used, my air lines crumbled that is how old they are, I'm hoping to be able to use these in my Duelist, just need to order new air lines. The nose gear I have is also a firewall mount.

Thanks
Ulf

P.S. I'm hoping in about 2 to 3 weeks to start building my Duelist....






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       Post #: 32

RE: Building a DUELIST MK 2 From Plans! - 3/21/2008 9:13:38 PM   
CrateCruncher



Posts: 629
Joined: 10/14/2005
From: Austin, TX, USA
Status: offline 		Good to hear you'll be starting your Duelist soon Ulf. It goes without saying but, post pics whenever you want. I'd like this to be more an exchange than a book report...

I forgot to mention, I drilled 3/4" holes in the center of ribs 2 through 6 about 1/2" behind the main spars for air and electric lines. You can see them in the last post. I plan to locate my aileron servo between rib 6 and 7. I also added 1/16" ply to ribs 3,4, and 5 for landing gear mount and nacelle reinforcement. Wing skins were completed a short time ago and came out nice.

All in all it's been a fun build and the dramatic styling of the plane are already starting to take shape.

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(in reply to ulfenator)
       Post #: 33

RE: Building a DUELIST MK 2 From Plans! - 3/21/2008 9:48:05 PM   
ulfenator


 

Posts: 39
Joined: 5/3/2003
From: Rochester, NY, USA
Status: offline 		Mike,
Is there a place here on RCU where I can learn how to post pictures, also what is the desireable size of picture to upload.

Thanks
Ulf



(in reply to CrateCruncher)
       Post #: 34

RE: Building a DUELIST MK 2 From Plans! - 3/21/2008 10:54:44 PM   
CrateCruncher



Posts: 629
Joined: 10/14/2005
From: Austin, TX, USA
Status: offline 		Here ya go:http://www.rcuniverse.com/forum/m_5218588/tm.htm

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       Post #: 35

RE: Building a DUELIST MK 2 From Plans! - 3/22/2008 12:59:19 AM   
ulfenator


 

Posts: 39
Joined: 5/3/2003
From: Rochester, NY, USA
Status: offline
quote:

ORIGINAL: CrateCruncher

Here ya go:http://www.rcuniverse.com/forum/m_5218588/tm.htm


Perfect, just what I need....

Thanks

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       Post #: 36

RE: Building a DUELIST MK 2 From Plans! - 3/22/2008 1:36:46 PM   
Michaelj2k



Posts: 312
Joined: 9/15/2006
From: Newark, DE, USA
Status: offline 		Here's an interesting variation of the Duelist. http://elliotfan.com/art/flight/me246/246_img_01.htm

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       Post #: 37

RE: Building a DUELIST MK 2 From Plans! - 3/23/2008 11:21:35 PM   
CrateCruncher



Posts: 629
Joined: 10/14/2005
From: Austin, TX, USA
Status: offline 		One down, one to go! I reinforced the leading edge with some scrap triangle stock, made a guide tube from rolled paper, and added additional 1/4" stock scraps to the trailing edge for the point hinges to bite into. I was going to build the entire wing t the same time but there was really no advantage to doing it that way and I figured sheeting would be easier one panel at a time.

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       Post #: 38

RE: Building a DUELIST MK 2 From Plans! - 3/24/2008 1:02:30 AM   
TCBLightning



Posts: 242
Joined: 12/30/2001
From: Waukesha, WI, USA
Status: offline