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MK Akromaster Build Handover

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MK Akromaster Build Handover

Old 02-10-2020, 11:01 PM
  #26  
erans
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Slow progress, but I did got to work on the fitting of the horizontal stabiliser and the fuselage.
I also sanded to shape and separated the rudder from the fin.
Last, I used filler on all the imperfections on both fuselage and rudder in preparation for covering.













Cheers,
Eran
Old 02-11-2020, 12:20 AM
  #27  
jimamosn8cah
 
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Wow, great build. It looks like you got the DLE 20 in there fine. There's a hobby shop near Youngstown, Ohio tha has one of these hanging up in it and I've been looking for one of these kits since first seeing it. Would it be possible to get the plans scanned or copied?

Regards,
Jim
Old 02-11-2020, 03:37 PM
  #28  
erans
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Jim - Thank you for the kind comments.
As to the plans, they are not a "scratch build" plans in the sense that they are missing many details such as the drawings of the ribs for the wing, elevator and rudder. They can be best described as "assembly drawings".
In addition, I am not sure where I can professionally scan this size of document (which will result with the scanned dimensions staying true). Not to mention that the plans are not in great shape to begin with (very fragile) and the drawing itself is in very fine lines.


Cheers,
Eran
Old 02-12-2020, 03:58 AM
  #29  
erans
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Today I covered the rudder.
Few friends were asking me how I go about covering an item such as the rudder, so I have the steps detailed here.
I basically always start from the section that has "inward corner" such as the hinge line and the rudder balance tab. Then I cover all the other small surfaces and curved sections. I try to use scrap sections of covering material that I keep from all my previous covering work.
Last, I cover the "main" flat areas.






The box of scrap covering material

Cheers,
Eran
Old 02-13-2020, 10:22 PM
  #30  
erans
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I started the process of covering the fuselage. I also pre-installed tubes for the pushrods exit from the fuselage (two for elevator, one for rudder and one for steering).










Cheers,
Eran
Old 02-16-2020, 11:46 PM
  #31  
erans
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I completed the covering of the fuselage sides and glued the horizontal stabiliser into place.








Cheers,
Eran
Old 02-17-2020, 10:30 PM
  #32  
erans
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Couple of items today, I covered the vertical fin and plumbed the fuel tank for petrol.







Cheers,
Eran
Old 02-18-2020, 10:29 PM
  #33  
erans
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I glued the vertical fin into place using a highly sophisticated alignment tool (a vertical scrap stick taped in the cockpit). Using a right angle tool on the horizontal stabiliser will not work, as it is tapered...
While waiting for the Epoxy to dry, I installed a Du-Bro HD control horn to the rudder (as it is too thick for the screws of a "standard" control horn). I then glued the pin-hinges to the rudder.
Last, I glued the rudder and elevators hinges into the vertical fin and horizontal stabiliser.











Old 02-25-2020, 12:14 AM
  #34  
erans
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Progress has been slow recently with other items taking the table space in the Cave.
Below is a photo of the tail with the tape removed and a photo of a plate I made from thin plywood to protect the wing surface from the wing bolts.
Today I installed the servos and connected the elevators. When testing the movement, it became obvious that it is not the same amount of travel up and down due to the geometry. I therefore offset the servo horns a bit.







Cheers,
Eran
Old 03-03-2020, 12:15 AM
  #35  
erans
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Some more progress:
The rudder and tail wheel steering are now connected;
Main landing gear attached;
The prop has been balanced and the engine placed on my engine test stand for tuning.







Cheers,
Eran
Old 03-04-2020, 09:09 PM
  #36  
erans
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I added some black strips covering to the bottom to assist with orientation.
Apologies for the photos quality, I had to use my phone as the camera battery was flat.








Old 03-05-2020, 06:44 AM
  #37  
A. J. Clark
 
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What kind of control horn are you useing on the elevators? Looks like they are connected in the hinge line.
Old 03-05-2020, 03:13 PM
  #38  
erans
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A. J. Clark - The control horn is a bent, one side threaded "music wire", which came with the kit and is inserted into the elevator as shown in the photo below of the plan. Very similar to the way ailerons were set-up using a single servo in the centre of the wing in the early R/C plans.

Yesterday I finally got to run and tune the engine on the stand.



Cheers,
Eran
Old 03-06-2020, 12:52 AM
  #39  
erans
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With the engine ready, I fitted it (and the fuel tank) into the airframe, and installed "fuel dot twist lock" and a fuel filter.
I really hope that I will not need to take the engine out any time soon as it was a very fiddly process.








Old 03-08-2020, 11:37 PM
  #40  
erans
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Some progress installing components into the aircraft which required mounting, such as the ignition module, Optical Kill Switch, 2x Batteries and the Receiver.
I made individual mounts utilising my scrap wood.
First to be installed was the ignition module which placement was mostly dictated by the length of the breaded cable to the spark plug.
Once it was in place I completed the link between the throttle and the throttle servo, which required longer servo arm then originally anticipated to provide full range of motion. I had to carve some material from the fuselage doubler to clear its path.
I then realised that I cannot mount the two batteries anywhere in a satisfactory way using the individual mounts, so I used clear plastic to draw a new mounting tray for them, which I then traced onto 2mm lite-ply. This was mounted using screws making it movable.
The Optical kill switch was placed under this tray next to the ignition. The receiver is still waiting to be installed.














Cheers,
Eran
Old 03-10-2020, 10:58 PM
  #41  
erans
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I installed the two switches, which are recessed into the balsa sides all the way to the doubler. I then mounted the receiver on a small plate attached to the former and routed the second antenna to the fuselage wall at 90 degrees.
I got back to covering, completing the removable "chin" and the top-front section of the fuselage (now that the engine screws are in place). The just visible hole at the top is access to the engine tuning screws.










Cheers,
Eran
Old 03-17-2020, 09:28 PM
  #42  
erans
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After careful read of the instructions, I cut the canopy to shape. The canopy is VERY thick and there was no way it can be cut with a knife. I ended up using a cutting wheel ("Dremel" tool) to cut near the line and then I sanded it to shape.
The fit to the fuselage was not good. The gluing had to be done in three stages, having to force the canopy to fit. Time will tell if it worked. I had some canopy glue run under the canopy, which is not looking very flash...

I got bored waiting for the tail-wheel to arrive (and the canopy glue to dry), so I decided to decorate the Akromaster by hand cutting lettering. The "E" top managed to "run away" as I ironed it into place, but otherwise it looks OK.













Cheers,
Eran
Old 03-31-2020, 02:09 AM
  #43  
erans
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I finaly got the tail wheel I had to use the Sullivan product as the Du-Bro tail wheel was too wide.
I marked the CG on the wing and balanced the aeroplane with 25g required at the tail.
I took the opportunity that the aeroplane was fully assembled and checked the control throws.
All is done now. I will be waiting for the COVID -19 restrictions to lift before I can test fly it. It may be half a year before I get the next opportunity to do it...








Cheers,
Eran

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