RE: Don Smith A-26  
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RE: Don Smith A-26 - 8/24/2007 3:59:27 AM   
wingspar


 

Posts: 188
Joined: 10/17/2003
From: Sammamish, WA,
Status: offline 		Progress is slow as always. My wife blew out her knee so I have to do the cooking and cleaning too.

More work on the fillets on the fuselage. Cutting out the parts for the wing center section. Tubes have arrived and the balsa delivery truck should be here tomorrow. Had to special order out the bellcranks for the flaps I hope will work. None of the hobby shops close to me carried any. It's mostly ARF stuff. I'm having to order out most of my supplies online.

Dave



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< Message edited by wingspar -- 8/24/2007 4:00:25 AM >

(in reply to wingspar)
       Post #: 76

RE: Don Smith A-26 - 8/30/2007 12:52:09 AM   
wingspar


 

Posts: 188
Joined: 10/17/2003
From: Sammamish, WA,
Status: offline 		My balsa wood order arrived from National Balsa and I'm very pleased with it. I've started on the left wing center section. Changes to plan I have done is an addition of a 1/8 balsa false leading edge. I find it much easier to install the wing sheeting with this in place. I made rib W1 at the center section out of 1/4" blasa instead of 1/8". This gives the wing sheeting more grip at that so important high stress part of the wing. I also changed the 1/16" ply shear webs to 1/8" hard balsa. This gives more glueing area especially against the wing ribs and are easier to make and trim for a perfect fit.

Some problems I encountered are that the rib are about 3/8" to short. I don't know if this is a problem in the original drawing or when they are inlarged that the vertical and horizontal enlargments are slightly different. Note to self, Buy Cad drawn plans. Another note to self, Nobody offers CAD drawn palns in this scale. The leading edge of W1 was about 1/4" to long and had to be trimed. I used the main spar as a baseline for placing the ribs. I used 1 1/4" standoffs on the ribs instaed of the suggested method on the plans.

I'm trying to make a fully operation slotted flap instead of simply just using a fixed hinge. What a pain in the #%*I^$%. Also note that the short ribs a side ribs that frame out the flaps are not show on the plan. I used a pattern from the larger rib close to it and after installing it sanded it down to its final shape. This worked out ok.

After I got the basic wing and flap done it just didn't look right to me. I checked the flap outline against the supplied threeview and my other sources and found that the plan did have the wrong outline on the inner flap. I've marked the correct outline on the plans. Looks like I'll have to do some cutting and filling. Hope it won't go to badly.

I checked the span of the wing center section as Ithy suggested earlier. There is about a 1/8" difference. Wing don't need to be the same length do they? I'll correct this on the right wing so they will be the same. Probably do to the enlargment process.

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< Message edited by wingspar -- 8/30/2007 1:35:15 PM >

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       Post #: 77

RE: Don Smith A-26 - 8/30/2007 6:36:33 AM   
Ichy


 

Posts: 159
Joined: 5/4/2004
From: reno, NV, USA
Status: offline 		I guess you decided not to redraw the wing plans. Wait till you try to join the two center sections together! OY!

I got about two hours into mine this week. Installed the wiring harnesses into the wings and installed two Robart air tanks into the fuse section that goes above the wing center section. You're putting me to shame how fast you are building! Keep it up.

(in reply to wingspar)
       Post #: 78

RE: Don Smith A-26 - 8/30/2007 1:32:02 PM   
wingspar


 

Posts: 188
Joined: 10/17/2003
From: Sammamish, WA,
Status: offline 		Ithy

I did draw a new wing a while back ago but chicken out and deceided to build the stock wing instead with a few minor changes.

Please fell free to post your progress here to if you wish. I'd like to see your progress and how you are installing things. I sure could help me in the future.

Dave

(in reply to Ichy)
       Post #: 79

RE: Don Smith A-26 - 8/30/2007 9:51:41 PM   
Ichy


 

Posts: 159
Joined: 5/4/2004
From: reno, NV, USA
Status: offline 		Thanks Dave, but by the time I make another post you will have flown your's! Lately I have been working out in the back yard trying to finish up my patio along with working, so not much time to spare. Haven't even been to the field to fly in awhile.

Are you going to put on any goodies? Lights, bombs, smoke ......

(in reply to wingspar)
       Post #: 80

RE: Don Smith A-26 - 8/31/2007 1:31:04 AM   
wingspar


 

Posts: 188
Joined: 10/17/2003
From: Sammamish, WA,
Status: offline 		I'm not planning to do any funtional lights or smoke. I'd like to be able to drop bombs but it depends on how much space is left in the bomb bay after the batteries, gyro are located there.

I was hoping for a flight report from you before mine is ready.


Also looking at all the high power servos this plane is going to have. Four flap servos, two rudder, two elevator, etc etc. This has got to be more then a receiver can handle so was considering using a "power box" to drive them with a seperate dual battery system. Have you given this any thought? What are your plans? Anybody else who reads this please let me know what is commonly done.

Dave


(in reply to Ichy)
       Post #: 81

RE: Don Smith A-26 - 8/31/2007 4:50:23 AM   
Ichy


 

Posts: 159
Joined: 5/4/2004
From: reno, NV, USA
Status: offline 		Power box would be good! Unless some one can suggest differently, I plan to use this: http://electrodynam.com/rc/EDR-111/index.shtml

In fact I have been using it in my 80" Yak. Using 6 volt on the servos and 4.8 with the receiver. Been using their fiber optic kill switches as well. Also by the time mine gets close to flying, I'll have put the spread sektrum modual on my transmitter.

I think this plane will be tail heavy so I will wait to mount batterys, but I bet they will go up front.

< Message edited by Ichy -- 8/31/2007 4:52:13 AM >

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       Post #: 82

RE: Don Smith A-26 - 8/31/2007 3:25:41 PM   
wingspar


 

Posts: 188
Joined: 10/17/2003
From: Sammamish, WA,
Status: offline 		The EDR looks like a good unit. I'll check it out.

Looking at the 1/8 ply Nacelle mounts, they don't seems to have any cutouts for the wingtubes shown. How did you handle this or am I missing something here??????

Dave

(in reply to Ichy)
       Post #: 83

RE: Don Smith A-26 - 9/1/2007 12:47:18 AM   
Ichy


 

Posts: 159
Joined: 5/4/2004
From: reno, NV, USA
Status: offline 		You're correct. I found this out after I built the nacelles. Add the cut outs in now if you can, but they were not that hard to cut out after the fact. I am also adding some cut outs for the servo wires.

(in reply to wingspar)
       Post #: 84

RE: Don Smith A-26 - 9/6/2007 3:02:06 PM   
wingspar


 

Posts: 188
Joined: 10/17/2003
From: Sammamish, WA,
Status: offline 		After spending about a week trying various methods of creating a slotted flap ..... move back and down...... , I surrender. Just to much slop for me. I thought about creating something similar to what Robart produces but deceided to just make a simple fixed hinge. Now to start on the other side.

Dave


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(in reply to Ichy)
       Post #: 85

RE: Don Smith A-26 - 9/11/2007 4:48:35 AM   
wingspar


 

Posts: 188
Joined: 10/17/2003
From: Sammamish, WA,
Status: offline 		Right side center wing framed but forgot to cut out servo wire runs in ribs. . Corrected flap outline done. Should be able sheet the top tomorrow.



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(in reply to wingspar)
       Post #: 86

RE: Don Smith A-26 - 9/11/2007 4:44:54 PM   
Ichy


 

Posts: 159
Joined: 5/4/2004
From: reno, NV, USA
Status: offline 		I was looking for a "smiley" that had a light bulb above his head, but this site does not have one. I built both wings complete, then cut the end panels off. Next I joined the center sections together. A pain in the rear because of the shape of the wing joiners with those rib cut outs. I did not even think to build it the way you are. Saw your picture above and said "OHHHHHhhhhh!" Live and learn.

(in reply to wingspar)
       Post #: 87

RE: Don Smith A-26 - 9/11/2007 10:50:20 PM   
wingspar


 

Posts: 188
Joined: 10/17/2003
From: Sammamish, WA,
Status: offline 		Different ways a doing the same thing. Hopefull your still working on yours making progress.

Top sheeting is now installed on starboard center wing.

I seem to be able to log onto Rcscalebuilder again. Maybe I was banned or something. I'll do my next one over there when this one is finished.

(in reply to Ichy)
       Post #: 88

RE: Don Smith A-26 - 9/12/2007 4:39:03 AM   
wingspar


 

Posts: 188
Joined: 10/17/2003
From: Sammamish, WA,
Status: offline 		Slowly coming together.

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(in reply to wingspar)
       Post #: 89