RE: Blue Angel - Build  
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RE: Blue Angel - Build - 5/17/2006 5:48:24 PM   
8178



Posts: 3015
Joined: 5/25/2004
From: _ , USA
Status: offline 		The ¼” balsa strips had been rough cut to fit so they required a little work with the razor plane and then final sanding. While I was sanding I gave both sides of the core surfaces a light sanding.

To be continued…


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Builder and flyer of high performance acrobatic R/C aircraft and a proud member of VR/CS.
Made in China = no sale!

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       Post #: 251

RE: Blue Angel - Build - 5/17/2006 5:56:03 PM   
8178



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quote:

ORIGINAL: jquid

What brand of retract is that? I am having trouble locating a good tri gear pneumatic system. robarts new one uses a pull pull for the nose requiring another servo fro steering. Then there is their older style, but is costly. Any recommendations?



They are Spring Air retracts. See page 2 and 3 of this thread for more detailed pictures and info. They are very well made and top quality. I like the steering setup that Spring Air uses rather than the tiller type used on other brands.

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Builder and flyer of high performance acrobatic R/C aircraft and a proud member of VR/CS.
Made in China = no sale!

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       Post #: 252

RE: Blue Angel - Build - 5/18/2006 2:27:27 AM   
8178



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Joined: 5/25/2004
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Status: offline 		To determine the wing wheel well positions I set aircraft on a flat surface with the gear down. I then adjusted the length of the main gear struts by moving the adjustable axels and measured water line at the tail and nose of the aircraft. I like to have about 1/8” of nose down rake between the tail and nose. After this adjustment I checked to make sure the right and left gear struts were the same length.

I used a piece of balsa as a template to rough cut the wheel wells out using my usual hot wire method. I made the first cut smaller than the final size so I can adjust the size later after the wing skins are glued on. Notice that I have not cut the struts off yet so I can make fine adjustments on the final fit.

To be continued…


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_____________________________

Builder and flyer of high performance acrobatic R/C aircraft and a proud member of VR/CS.
Made in China = no sale!

(in reply to 8178)
       Post #: 253

RE: Blue Angel - Build - 5/19/2006 1:19:10 PM   
8178



Posts: 3015
Joined: 5/25/2004
From: _ , USA
Status: offline 		My Tower order arrived with my third Futaba S9252 digital servo along with a Sullivan cable for my nose gear steering and throttle connection. I’ll be using S9252s on the ailerons and elevator and a S3151 for the rudder.

To be continued…


_____________________________

Builder and flyer of high performance acrobatic R/C aircraft and a proud member of VR/CS.
Made in China = no sale!

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       Post #: 254

RE: Blue Angel - Build - 5/19/2006 6:27:25 PM   
rainedave



Posts: 5172
Joined: 7/21/2005
From: Greensboro, NC, USA
Status: online 		The gear wells look great. I have a couple questions about your servo choices. Why the 3151 for rudder? It puts out less than half the torque of the 9252s. I was of the understanding that rudders usually demand greater torque; but maybe that's only the case with contemporary 3-D models, and not with vintage pattern designs. Are you choices based more on the precision of the servos than their muscle? I can see that the 9252s would definitely give you more precision for aileraons and elevator.

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       Post #: 255

RE: Blue Angel - Build - 5/19/2006 8:39:09 PM   
8178



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quote:

ORIGINAL: rainedav

The gear wells look great. I have a couple questions about your servo choices. Why the 3151 for rudder? It puts out less than half the torque of the 9252s. I was of the understanding that rudders usually demand greater torque; but maybe that's only the case with contemporary 3-D models, and not with vintage pattern designs. Are you choices based more on the precision of the servos than their muscle? I can see that the 9252s would definitely give you more precision for aileraons and elevator.


It was my way to save $40 on the project! Not that the Blue Angel doesn’t deserve a $75 rudder servo. I’m using one on my Tiporare and it seems to work fine. Remember that digital servos put out FULL torque on the very first step of movement unlike analog servos. They hold their position with full power too if a force is placed on them. You must be careful that any linkage attached to them is free of binds because they will use full power (and your battery) to move to the commanded point of movement.


_____________________________

Builder and flyer of high performance acrobatic R/C aircraft and a proud member of VR/CS.
Made in China = no sale!

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       Post #: 256

RE: Blue Angel - Build - 5/19/2006 10:34:27 PM   
8178



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Joined: 5/25/2004
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Status: offline 		Before gluing the gear mounts into the wing with epoxy I drilled 3/16” holes for dowels that project into the foam to help lock in the mount. The dowels project so that they stop just under the top surface of the foam. They are glued into the wing and mount with epoxy. I decided that two would be enough for each mount.

To be continued…

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_____________________________

Builder and flyer of high performance acrobatic R/C aircraft and a proud member of VR/CS.
Made in China = no sale!

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       Post #: 257

RE: Blue Angel - Build - 5/20/2006 12:23:14 PM   
8178



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Joined: 5/25/2004
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Status: offline 		Because of the swept wing and the way the mount is installed at an angle to the airfoil, the mount had to be countersinked into the foam. This left a space that was filled in with scrap foam. I then sanded the foam to the shape of the airfoil.

To be continued…



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_____________________________

Builder and flyer of high performance acrobatic R/C aircraft and a proud member of VR/CS.
Made in China = no sale!

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       Post #: 258

RE: Blue Angel - Build - 5/20/2006 10:13:40 PM   
8178



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Joined: 5/25/2004
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Status: offline 		I cut the slot in the wing for the retract gear air line using my usual hot wire. I normally fill in the top edge of the slot with 1/16” balsa.

To be continued…


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_____________________________

Builder and flyer of high performance acrobatic R/C aircraft and a proud member of VR/CS.
Made in China = no sale!

(in reply to 8178)
       Post #: 259

RE: Blue Angel - Build - 5/22/2006 11:44:12 PM   
8178



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Joined: 5/25/2004
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Status: offline 		Before hacking holes in the wing for individual aileron servos I recheck how a single servo would work in the center of the wing. Not much room so I’m going to use two servos in the wing outboard from the retract units.

To be continued…



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_____________________________

Builder and flyer of high performance acrobatic R/C aircraft and a proud member of VR/CS.
Made in China = no sale!

(in reply to 8178)
       Post #: 260

RE: Blue Angel - Build - 5/25/2006 2:16:35 AM   
8178



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Joined: 5/25/2004
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Status: offline 		I cut out the servo openings and servo lead pathways to the servos using the usual hot wire method. A 1/32” countersink in the foam around the servo opening provides space to glue in a 1/32” plywood frame. The plywood servo mount has been cut and drilled but not installed yet. Because I’ve made the large cutout for the servos so close to the retract mount I’m going to add some more dowels to the retract mounts for strength.

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Builder and flyer of high performance acrobatic R/C aircraft and a proud member of VR/CS.
Made in China = no sale!

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       Post #: 261

RE: Blue Angel - Build - 5/27/2006 5:39:25 PM   
8178



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Status: offline 		View of the 3/16” dowels added to the gear mount.

To be continued…



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_____________________________

Builder and flyer of high performance acrobatic R/C aircraft and a proud member of VR/CS.
Made in China = no sale!

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       Post #: 262

RE: Blue Angel - Build - 5/28/2006 9:26:02 PM   
8178



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Status: offline 		I completed the gluing of the 1/16” X 4 “ X 36” balsa sheets together for the wing skins. I use Titebond glue. I weighed and sorted the sheets before gluing so could use the lightest sheets on the right wing to help compensate for the right mounted engine. There was not much difference in weight between the sheets but every bit helps the weight management.

The Dynamic Balsa sheets are cut clean enough that no trim work is needed on the edges before gluing. I usually just sort through the sheets and find sheets that will fit together without gaps. The sheet seams are pulled together very tightly using masking tape and then I add a full piece of masking along the seam. I always stretch the masking tape slightly as I tape so it pulls the seams together tightly. After all three sheets are taped together on one side I turn the sheet over and open the seam slightly and run a small bead of glue in the seam then close the seam by laying the sheet on a flat surface. I then wipe away the excess glue and tape the seam very tightly in about 5 or 6 places along the seam. The idea is to have very little glue at the seam edges.

The side that has the full length tape will be the outside surface because the other side always ends up with a little glue residue from wiping away the excess.

To be continued…


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_____________________________

Builder and flyer of high performance acrobatic R/C aircraft and a proud member of VR/CS.
Made in China = no sale!

(in reply to 8178)
       Post #: 263

RE: Blue Angel - Build - 5/28/2006 11:11:44 PM   
8178