HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old May 22, 2011, 08:29 PM
Registered User
BryanEW710's Avatar
United States, OH, Cincinnati
Joined Sep 2010
1,648 Posts
Build Log
My First Build - UMX-Inspired Yak-55M

It's time for my first build: a UMX-inspired Yak-55M. The plane (with wood parts for control rods and carbon bracing) was furnished by forum member cpdude (thank you!).

Here are some pics of the parts as they arrived:


DSCF7877 by bryanewyatt, on Flickr

DSCF7881 by bryanewyatt, on Flickr

DSCF7878 by bryanewyatt, on Flickr
(I poked out some of the holes here)


DSCF7880 by bryanewyatt, on Flickr

I'm going to have LOTS of questions, as I've never assembled a plane from scratch before.

Wish me luck!
BryanEW710 is offline Find More Posts by BryanEW710
Last edited by BryanEW710; May 22, 2011 at 09:15 PM. Reason: Edit Thread Title
Reply With Quote
Sign up now
to remove ads between posts
Old May 22, 2011, 09:52 PM
Registered User
BryanEW710's Avatar
United States, OH, Cincinnati
Joined Sep 2010
1,648 Posts
More pics from the build-up tonight...

I did the beveling with sandpaper. What do you guys think?


Build-up 005 by bryanewyatt, on Flickr

Build-up 004 by bryanewyatt, on Flickr

Here's the horizontal fuse mocked with the upper fuse. No CA used at this point:


Build-up 002 by bryanewyatt, on Flickr

All fuse components fully assembled:


Build-up 006 by bryanewyatt, on Flickr

Build-up 008 by bryanewyatt, on Flickr
BryanEW710 is offline Find More Posts by BryanEW710
Reply With Quote
Old May 22, 2011, 11:44 PM
Registered User
BryanEW710's Avatar
United States, OH, Cincinnati
Joined Sep 2010
1,648 Posts
Last pics for tonight.

Got the control surfaces installed:


Build-up 010 by bryanewyatt, on Flickr

Mocked it up one more time:


Build-up 011 by bryanewyatt, on Flickr

Took a shot of the 4-Site that will be giving up its servos and motor (and perhaps its carbon rods):


Build-up 009 by bryanewyatt, on Flickr

I then decided to tackle covering the horizontal surfaces. I stretched out a sheet of the covering material, then dusted 3M Super 77 on the upper surface and then laid it across the sheet and flattened it. Once it dried for a few minutes, I cut the plane out and made slits where the control surfaces were supposed to move.

I must have removed it a little more quickly than I should have and noticed that the left aileron's covering was loose. Stupidly, I sprayed the Super77 up close. It frothed on the foam...and began dissolving it!


Build-up 013 by bryanewyatt, on Flickr

Build-up 014 by bryanewyatt, on Flickr

To try to fix this, I cut a triangle of 3mm depron in half (making it 1.5mm or so thick and CA'ed it over the low area):


Build-up 017 by bryanewyatt, on Flickr

That's all for tonight!
BryanEW710 is offline Find More Posts by BryanEW710
Reply With Quote
Old May 23, 2011, 06:42 AM
Registered User
BryanEW710's Avatar
United States, OH, Cincinnati
Joined Sep 2010
1,648 Posts
This morning, I went back and beveled the ailerons to get more travel.

First question today: When I go to put the fuse together, do I cover the two sections separately and then attach them to the horizontal fuse?

Second question: Do I attach and cover the rudder before or after I attach the fuse?
BryanEW710 is offline Find More Posts by BryanEW710
Reply With Quote
Old May 23, 2011, 07:15 PM
Registered User
United States, SC, Spartanburg
Joined Feb 2011
186 Posts
hi there, i love this!! i have the guts out of the micro su-29. i sat down with some 3 veiw drawings of the yak 55m and tried to resize them down to this size but it just didn't come out right. is there anyway i could get the drawings of what u have done here?? or can u help me out on that?? i know the su-29 had only 1 servo for the ailron and the 4-site had two but i'm sure using all the hardware i could get one to work. i'm very interested in this!!! i am a yak 55m lover!!! i love the way it flys!!!

thanks
mikey
madmikeyreturns is offline Find More Posts by madmikeyreturns
Reply With Quote
Old May 23, 2011, 07:56 PM
Registered User
BryanEW710's Avatar
United States, OH, Cincinnati
Joined Sep 2010
1,648 Posts
Check out the UMX Yak thread. There are several folks who have plans available. A couple of them will even laser cut you a plane out of foam like mine for a very nominal fee.
BryanEW710 is offline Find More Posts by BryanEW710
Reply With Quote
Old May 23, 2011, 11:48 PM
Registered User
BryanEW710's Avatar
United States, OH, Cincinnati
Joined Sep 2010
1,648 Posts
More updates!

Vertical surfaces tacked and curing on covering:


Build-up 018 by bryanewyatt, on Flickr

Lower fuse covered:


Build-up 019 by bryanewyatt, on Flickr

Covered upper fuse attached with thin CA:


Build-up 020 by bryanewyatt, on Flickr

First pic with lower fuse attached:


Build-up 021 by bryanewyatt, on Flickr

Unlike the horizontal control surfaces, which were covered and hinged in one step, the rudder was covered separately. Therefore, I used hinge tape (Blenderm) only:


Build-up 024 by bryanewyatt, on Flickr

Unfortunately, I didn't do as good a job with the horizontal surfaces as I did with the vertical ones


Build-up 027 by bryanewyatt, on Flickr

Close-up of the other side of the rudder:


Build-up 029 by bryanewyatt, on Flickr

The hole where the AR6400 will be sitting is in center of this pic. Not sure where I'm going to put the aileron servos, though...


Build-up 031 by bryanewyatt, on Flickr

Fuselage bracing:


Build-up 033 by bryanewyatt, on Flickr

Further away (and yes, I'm sitting between my furnace and the washer/dryer):


Build-up 032 by bryanewyatt, on Flickr

Installed the fences for wing bracing:


Build-up 035 by bryanewyatt, on Flickr

All ready for bracing, servos, and powertrain


Build-up 037 by bryanewyatt, on Flickr
BryanEW710 is offline Find More Posts by BryanEW710
Reply With Quote
Old May 25, 2011, 09:27 PM
Registered User
BryanEW710's Avatar
United States, OH, Cincinnati
Joined Sep 2010
1,648 Posts
Did a little bit of work today...

This was a mostly-intact 4-Site...until today!


Build-up 041 by bryanewyatt, on Flickr

Before that, I cut the electronics out of the plane...


Build-up 043 by bryanewyatt, on Flickr

...and salvaged as many of the CF rods from it as I could (sadly, the stack of 4 thin rods in the middle is the remains of the two rods cross-bracing the wing; the complete set is on the right)


Build-up 044 by bryanewyatt, on Flickr

Test-fitting the receiver:


Build-up 045 by bryanewyatt, on Flickr

Aileron servos and the first braces fitted (the right aileron pushrod actually goes at a slight angle to the control horn because the aileron servos are identical and not mirrored):


Build-up 047 by bryanewyatt, on Flickr

Also fitted a couple braces at the tail. I hope I'm not adding too much bracing...I'm just using what I have available!


Build-up 049 by bryanewyatt, on Flickr

Couldn't resist the urge to add another brace. The last one will likely be the other pair going to the main wing.


Build-up 050 by bryanewyatt, on Flickr
BryanEW710 is offline Find More Posts by BryanEW710
Last edited by BryanEW710; May 25, 2011 at 10:33 PM.
Reply With Quote
Old May 25, 2011, 10:26 PM
Designing something...
United States, CA, Cameron Park
Joined Jan 2004
1,693 Posts
Looking good!
cpdude is offline Find More Posts by cpdude
Reply With Quote
Old May 25, 2011, 10:34 PM
Registered User
BryanEW710's Avatar
United States, OH, Cincinnati
Joined Sep 2010
1,648 Posts
Wow...thank you! That means a lot!

I was meaning to ask because I've never really worked with something this small, but what kind of throws should I expect? Should I also dial the expo up quite a bit?
BryanEW710 is offline Find More Posts by BryanEW710
Reply With Quote
Old May 25, 2011, 10:45 PM
Designing something...
United States, CA, Cameron Park
Joined Jan 2004
1,693 Posts
I may not be a good role model here! j/k!!

I usually go for the largest throws I can get mechanically then dial in a bunch of expo (40-50%). I'm also not a big fan of dual rates.
cpdude is offline Find More Posts by cpdude
Reply With Quote
Old May 25, 2011, 10:51 PM
Registered User
BryanEW710's Avatar
United States, OH, Cincinnati
Joined Sep 2010
1,648 Posts
Quote:
Originally Posted by cpdude View Post
I may not be a good role model here! j/k!!

I usually go for the largest throws I can get mechanically then dial in a bunch of expo (40-50%). I'm also not a big fan of dual rates.
Interesting...I hadn't thought about not having dual rates, but I did think to bevel both sides of the control surfaces when I noticed that I didn't have great throws.

I'm a little worried about the right aileron, what with the pushrod running at a little angle. Does it look OK? I'm kind of impressed that I managed to eyeball that fitting!
BryanEW710 is offline Find More Posts by BryanEW710
Reply With Quote
Old May 25, 2011, 10:54 PM
Designing something...
United States, CA, Cameron Park
Joined Jan 2004
1,693 Posts
The right aileron will probably be okay. You definitely should have moved the horn inboard a bit.
cpdude is offline Find More Posts by cpdude
Reply With Quote
Old May 25, 2011, 11:12 PM
Registered User
BryanEW710's Avatar
United States, OH, Cincinnati
Joined Sep 2010
1,648 Posts
Quote:
Originally Posted by cpdude View Post
The right aileron will probably be okay. You definitely should have moved the horn inboard a bit.
Yeah...I had made the mistake of mounting the horns symmetrically before I realize that the servos are identical

Rookie build mistake, eh?

I'm going to try coloring with a Sharpie before I mount the receiver. I also need to lengthen the rods for the rudder and elevator. I think for this one, I'm going to leave the landing gear off. I've already added too much weight!
BryanEW710 is offline Find More Posts by BryanEW710
Reply With Quote
Old May 26, 2011, 09:41 PM
Registered User
BryanEW710's Avatar
United States, OH, Cincinnati
Joined Sep 2010
1,648 Posts
Paintjob!

Did the last thing I wanted to get out of the way before adding the last of the bracing and then the receiver and powertrain: painting

All work done with a single blue Sharpie:


Build-up 052 by bryanewyatt, on Flickr

Build-up 051 by bryanewyatt, on Flickr

Well, what do you think?
BryanEW710 is offline Find More Posts by BryanEW710
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion UMX inspired Yak AJWoods Scratchbuilt Indoor and Micro Models 361 Oct 28, 2014 08:25 PM
Discussion A What If Build...inspired by Burnelli rc capo The Builders Workshop 15 Nov 30, 2013 12:43 PM
Sold UMX inspired YAK kit w/ electronics - $70 shipped obo Trapviper Aircraft - Electric - Micro & Indoor Airplanes (FS/W) 2 Apr 06, 2011 06:44 AM
Discussion New DW Foamies Yak 55M and SP Build Thread Joethefloorman 3D Foamies 85 Feb 06, 2011 01:29 AM
Discussion Yak 55m Build Log Nooflyer Indoor Pattern/F3P 5 May 20, 2008 02:38 PM