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Old Jul 20, 2014, 01:49 PM
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Baar, Switzerland
Joined Oct 2006
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Pak Fa - Full Fuse Pusher: Try and Error Approach

I tried to draw up plans for a PakFa already end of 2012. February last year, I just did quickly a 50 % proof of concept build. Since then, I did not do much about flying or building.

So two weeks agou, when my 8 year old son stumbled into my hobby room, he picked up the PakFa and wanted to throw it around. But first I needed to balance it.

What eventually happened: We did gliding/gc tests, just for fun.
RC Pak Fa Glide Test (0 min 50 sec)
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Old Jul 20, 2014, 01:56 PM
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Baar, Switzerland
Joined Oct 2006
256 Posts
First Session

So somehow I got the bug. I will build a 100 % version, but I have to play it by the ear.
I have no clue, how to link the control surfaces, where to put the controller, .... so I will take it step by step. The concept I want to follow:
Just building small components, and in the end, it should be just one big puzzle.
My component list:
- nacelles
- front part bottom
- front part top
- turtle deck
- nacelles (upper part)
So last week, I started with just putting most of the components together
Instead of cutting bevels, I just glued in the formers at the correct place, and then was just able to sand the bevel with a sanding block.
Eventually I was surprised, how far I got.
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Old Jul 20, 2014, 02:02 PM
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Baar, Switzerland
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Session two

So today, I worked some more on the Pak Fa.

Highlight: The nose. It took me longer than expected, but eventually I was happy with it.
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Old Jul 22, 2014, 03:57 AM
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Baar, Switzerland
Joined Oct 2006
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Session three

This time, working on the upper part.
This included cutting, glue and sanding the "upper" nacelles.
My original idea to form the sides went down the drain, since the first part I wanted to bend, just broke.
So I just "doubled" up the front section of the nacelle, but as a side effect, I had no problems to sand it into shape.
The next challenge was to cut out the inner shape of the nacelle out of the turtledeck.

All in all, I'm quite happy so far.

But, I really need to think about the control surfaces - how to connect them. On the outside or via linkage on the inside

Not sure yet. Any comment is welcome !
Cheers
Olli
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Old Jul 23, 2014, 01:51 AM
Fremont, CA
United States, CA, Fremont
Joined Jan 2009
1,613 Posts
Nice workmanship! What's going to propel it, or will it soar?
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Old Jul 23, 2014, 03:00 AM
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Baar, Switzerland
Joined Oct 2006
256 Posts
Thanks. It will be a pusher.
I don't think the 100% will be soaring as well as the 50% !
The surface will double("lift"), but the weight will triple. Not that I expect it to be a flying brick - like my avatar
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Old Jul 23, 2014, 04:11 AM
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Baar, Switzerland
Joined Oct 2006
256 Posts
Session four

Today, I cut out the rudders
Nothing really special, but I had to tinker about the base of the rudders. Took me some time to figure it out, what to glue and how to sand it.
Result is ok.

Next steps: Dremel the elevators. Then it really gets to installing servos, motor, ... and glue the different pieces to one Pak Fa.

Question: I like to paint it like the 055 (see pic). Does anyone know what color they used ? Depending on the pictures I found or articles I read: It's light/dark blue or gray
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Old Jul 23, 2014, 10:33 AM
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Germany, SN, Dresden
Joined Nov 2008
56 Posts
Hi lessram,

interesting project.
To choose the right colour, have a look at http://www.mars.slupsk.pl/fort/sukhoi/default.htm

This site is my favorite place to look for colour schemes.
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Old Jul 23, 2014, 10:29 PM
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Baar, Switzerland
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Perfect Torsten !
Excactly what I've been looking for.

"Ein herzliches Dankeschön" to the north
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Old Yesterday, 08:14 AM
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Baar, Switzerland
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Session five: Dremel time

Today was a Dremel day.
Finally I decided to link the ailerons "internally" through a big "Z bend" (or whatever you call it in English). Also dremeled the elevators for the carbon spar. Took me a while to figure out how to place the pieces. Another annoying thing: Setting the depth of the milling head. Half a mm up - no too much - a notch down .....

Except of the cockpit, I don't know what to "construct" anymore. So it is nearing the point, where I have to install the electronics and begin to glue the pieces
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Old Yesterday, 02:25 PM
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Schweiz, AG, Merenschwand
Joined Oct 2011
761 Posts
well done Lessie. Nice to see that you make fast progress!
While I have my foots in the pool I read your thread.
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Old Today, 03:53 AM
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Baar, Switzerland
Joined Oct 2006
256 Posts
Session six: Control surfaces

Hey Wobisch
Enjoy your well earned holiday. Not yet eager to come back and put some planes into the air ?

Control surfaces was the theme of today. Where exactly to place the servos, esc ....

One problem I encountered: Since the esc will be placed in the middle of the plane, no airflow there. So I places some air- diverters in front of the serveros to push some air in, and I hope that Bernoulli will suck it out. If it will be enough, we'll see.

Rest is more or less straight forward.

Cheers
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