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Old Apr 19, 2012, 01:24 AM
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Quote:
Originally Posted by P_J_Glor View Post
Are those standoffs laminated balsa or ply? Either way, an idea worth remembering (stealing)

Pete G.
100% agree. The laminated plynth looks to be significantly more substantial than the commercial alloy 'legs' that are available, and probably weighs about the same. Also interested to know the lamination construction method for future use
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Old Apr 19, 2012, 02:52 AM
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Pete and Sparks.

Nothing that complicated. Just scrap plywood doubled up to obtain the required spacing I needed.
Actually the plywood is Russian Birch. I have also seen it labelled as Baltic Birch.
It is metric measured and comes in around 18mm thick and 13 layers. Not quite 3/4".
The plywood is just some scrap pieces I had left over from when I built my folding field assembly stand. I picked up the Baltic birch plywood from the local Home Depot. Smaller sheets than the 4'x8' were available.

I am surprised no one has made a comment about the deck screws to hold the motor to the standoffs.

I do know the screws and standoffs work as I am using a similar setup in a 6s lipo system and have never had an issue.

I will post some more pics of the mount tomorrow.

Chris
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Old Apr 19, 2012, 05:47 AM
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Thanks Chris, good to know that I'm not alone in the preference of using whatever is to hand and available to solve a problem. Simple, free, cheap, easy are just a few of my watchwords
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Old Apr 20, 2012, 02:12 AM
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Just adding a couple of additional pictures of the motor mount with motor attached.

The mount is secured only with screws in case I need to remove it and add down or side thrust. Two of the screws are hidden under the servo plate. As it stands now the motor is set at 0 degrees.

I also added some balsa wedges around the inside of the firewall for strength.

Chris
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Old Apr 26, 2012, 02:23 AM
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Time to add an update to this thread.

With most of the front of the Falcon finished it is time to start the work on the tail feathers. Remember the Falcon is a free flight bird and I will be making a lot of changes to the next part of the build so there will be RC control. I will try to add as much detail to the thread with this part of the build of the changes I make. If you guys want extra details on this part do ask. The challenge is to add the control without loosing the original shape which makes it the Plecan Falcon. Also I want to minimize any control rods showing.

Starting with the tail ribs. Again from paper cutouts to the balsa ribs.

Chris
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Old Apr 27, 2012, 02:38 AM
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Laminating up the leading edges for the stabilizer.

I must say for the size of the plane, the designer sure liked to use thick pieces of balsa.
The pic shows two 1/4" pieces being glued together to yield a 1/2" square leading edge that will be tapered down to 3/8" on the outer ribs.

Chris
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Old Apr 28, 2012, 02:05 AM
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Notching the stabilizer ribs to the spar.

Note that I changed the 1/4" x 3/8" spar to popular from balsa.
I also moved the spar forward 3/4" from the original location so I will have room for the linkages and my fingers to install those linkages.

Chris
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Old May 02, 2012, 02:09 AM
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Have all the pieces cut out to assemble the stabilizer and have them nicely arranged for the picture.

As I did on the wing the leading and trailing edges are notched to accept the ribs. I decided to build the elevator width at 2 3/4" and have cut the necessary amounts off the ribs.
I will be building the elevator in two pieces with a wire joiner.
As you can see in the picture the three center ribs are first glued in place along with the wire joiner and sleeve.
The only other item to mention is the maple key I added for strength between the balsa leading edges where they will be joined together.

Chris
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Old May 03, 2012, 02:32 AM
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Seems to be one of those days that you can't get much accomplished on the build.

A few stab. ribs were glued in.

Chris
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Old May 03, 2012, 02:42 AM
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The rest of the ribs are glued into place.

I haven't trimmed back the leading edge ends yet but I will be leaving a 3/16" extention past the last rib on each end of the stab.
You can see in the picture the two spars extending past the last rib already. The extensions will help orientate the fin to the correct position and will be a stronger joint by slotting into the fin, instead of just gluing the fin to the side of the last rib.

I will have to do a little trimming to the extentions at a later date.

Chris
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Old May 03, 2012, 07:32 AM
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The H Stab look like its going to be a solidly constructed member Chris. Nice work

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Old May 04, 2012, 02:42 AM
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Quote:
Originally Posted by sparks59 View Post
The H Stab look like its going to be a solidly constructed member Chris. Nice work

sparks
Hi Sparks

I am building the Stab a little more solidly than what I normally would. I am a little worried with the fins mounted to the ends of the stab. The fins are also the contact points for the tail section when the Falcon is resting on the ground.
I just have visions of something letting go if it is just a regular glue joint. That is why I am adding all the mortise and tenon joints.

Chris
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Old May 05, 2012, 02:52 AM
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The right half elevator parts.

All glued together with some extra bits of balsa for strength.

Just note the allowance I had to make for the travel of the rudder.

Chris
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Old May 06, 2012, 01:48 AM
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Finished the other elevator half. It went together much faster.
Now we have the required two.

Worked on fitting the elevators to the stab. Wire joiner was a little out but everything looks nice and square now.

Chris
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Old May 06, 2012, 05:07 AM
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Nice neat woodwork as always Chris.
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