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  #21  
Old 03-11-2011, 07:24 PM
Rocketflyer's Avatar
Rocketflyer Rocketflyer is offline
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Quote:
Originally Posted by FlyBack
Progress report... and Quiz:

[big snip]

The quiz: Find the rocket in photo #1

Regards,

FlyBack



Still looking (for the rocket).
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  #22  
Old 03-11-2011, 08:13 PM
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cas2047 cas2047 is offline
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Quote:
Originally Posted by Rocketflyer
Still looking (for the rocket).


Me too! I saw NO rocket in that picture.
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  #23  
Old 03-14-2011, 03:54 PM
samb samb is offline
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Join Date: Aug 2006
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Quote:
Originally Posted by FlyBack
Progress report... and Quiz:

Preformed corner pieces are on and roughly shaped. Inside and outside photos below. Also included, a photo of an Estes StratoBlaster/Centurian fuselage pod next to my Zuni-RBG pod for comparison purposes.

The quiz: Find the rocket in photo #1

Regards,

FlyBack


I don't know... she looks kinda pissed. Nice build thread though.
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  #24  
Old 03-17-2011, 06:09 PM
FlyBack FlyBack is offline
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Join Date: Apr 2009
Location: Atlanta
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Default Glassing tips

Quote:
Originally Posted by samb
I don't know... she looks kinda pissed. Nice build thread though.

Thanks! More updates coming soon... I think she looks pissed because there hasn't been a decent replacement for the Estes Centurion in production for years (one that was a decent glider at any rate). I know I am...

Back to building: Glassing technique.

Photos below show the method used to do all of the fiber glass reinforcements on this model. Handling and cutting light weight glass cloth and carbon tow fibers can be difficult. I like easy. So... I use "helper" materials. Not shown is a can of 3M 75 spray adhesive. Used sparingly, it makes handling of the cloth easy (oh... and I mean very sparingly). Peel ply is your friend guys. It makes it possible to get very dry layups without vacuum bagging. It also leaves a surface that requires very little filling or sanding that can be bonded to.

Regards,

FlyBack
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Last edited by FlyBack : 04-12-2011 at 08:32 PM. Reason: syntax
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  #25  
Old 04-07-2011, 05:31 AM
FlyBack FlyBack is offline
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Join Date: Apr 2009
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Posts: 93
Default Control System

Progress Update: Rigging the control system

The most difficult part of the build is now behind me. The V-tail is finished and attached to the booms. The fixed portion is covered in Esake Silk. The rudder-vators are covered in Japanese Tissue. Water based polyurethane was use as the binder.

My technique for bending the PEEK tubing has been refined, and the servo tray is ready to install. Bending the control runs (PEEK tubing), without collapsing the wall, had me stumped for a while. I finally found some stainless steel, braided leader wire that was just under the ID of the tubing. Threading that through the tube to be bent, and then heat forming it around my mandrel worked like a charm.

Weights now include hardware for aileron servos. I had hoped to do this with rudder and elevator alone but have decided to go for full control on all three axis.

Latest weigh in:

Airframe - 170.9 grams
Servos - 31.2 grams
Rx - 7.4 grams
Battery - 15.6

Regards

DJ Miller
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  #26  
Old 04-08-2011, 02:50 PM
FlyBack FlyBack is offline
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Join Date: Apr 2009
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Default Rigging continued

More photos...

Uploaded some photos of the servo tray before it gets installed. It took some time to get the servo height just right to line up with the cable runs... but worth the effort.

Cutting slots in the wing for the tail booms creates an enormous stress concentration. The photos of the wing show the area where I have added a fiberglass reinforcement (shown with and without peel ply). The bottom side will be glassed also.

Latest weigh in results:

Servo Tray 4.0 gm
PEEK tubing 1.5 gm
Glass on wing 15.0 gm

Airframe 191.8 gm

Total 8.3 oz 235.6 gm



Regards,

FlyBack
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Last edited by FlyBack : 04-13-2011 at 09:09 PM.
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  #27  
Old 04-15-2011, 05:51 PM
FlyBack FlyBack is offline
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Join Date: Apr 2009
Location: Atlanta
Posts: 93
Default Control Horns

Todays topic: Control horns and negative Ackerman...

Not a lot to say here, most of the really good "Ackerman" links have already been posted. If I have gotten the angles on the control horns wrong, they will bind. Since they are now installed, I will know as soon as I pull the control wires and start testing (sometime tonight or tomorrow... stay tuned)..

The photo set below shows some of the steps involved in making control horns from scratch. I tend to build right off the drawing board. It saves time. A light coat of white primer on the graphite sheet makes it easy to see pencil markings. Sticky paper templates invariably peel or shift when working on parts this small. Eventually I will go back and do CAD drawings of the finished parts (when I am sure the parts I am drawing actually work).

Safety Warning: Use protective gear when working with carbon fiber. (See attached photo).

Regards,

DJ Miller
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Last edited by FlyBack : 04-19-2011 at 12:38 AM. Reason: added Ackerman link
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  #28  
Old 04-18-2011, 04:19 AM
FlyBack FlyBack is offline
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Join Date: Apr 2009
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Posts: 93
Default Pull/Pull control system

It works...

On the ground at least. The pull/pull control system is installed and tested. No binding, zero slop. Photos attached:

Regards,

FlyBack
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Last edited by FlyBack : 04-19-2011 at 12:32 AM. Reason: added text to photos
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  #29  
Old 04-19-2011, 12:48 AM
FlyBack FlyBack is offline
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Join Date: Apr 2009
Location: Atlanta
Posts: 93
Default Pull/Pull control system details

More details...

The servo horn screws hold the tension on the wires. Attachment to the control surface horn is a simple overhand knot tied in the wire.

Latest weigh in includes the servos, receiver and battery pack:

Total 241.82 gm (8.53 oz)

Parts remaining: Aileron push rods, Fuselage hatch, hatch mounting points (for nylon screws - four places).


FlyBack
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  #30  
Old 04-19-2011, 04:23 PM
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Rocketflyer Rocketflyer is offline
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This is just an amazing build thread and project. Super!
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