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The third of my recent LOS builds is another profile 3D aerobat. I had fond memories of these planes from way back and the chance to build a larger “indestructible” 3D trainer was too good to pass up!

 

Big box = big foam!

It’s always nice opening a big box and be greeted with piles of freshly made/moulded aeroplane. The Wargo Yak 55 doesn’t disappoint here and all the well packaged components were brightly coloured EPP foam with fiberglass (?carbon?) spars and stringers already glued in place. The amount of bracing in this model is impressive and well thought out. It does make for a very rigid airframe.

The bays for servos, ESC, battery and receiver are already moulded into the foam although the runs for the servo leads are up to you. I used a sharp blade to make shallow cuts in the foam, then pushed the leads out of sight. Being EPP, you can then “heal” the cuts with superglue. This did scuff the paint slightly in places and is a pretty permanent installation for the leads, but the end result was very neat.

The wings can be fitted as removable items or fixed permanently with some epoxy. I chose the latter as it makes for a much more rigid airframe – an all-important feature in a 3D aerobat.

 

It wasn’t all smooth-sailing…

This is a very easy and pleasant kit to put together but there were a few bumps along the way that you should know about:

  1. What is going on with that motor mount? I used the suggested 35mm can outrunner and those holes don’t match up with anything. I found I had to use a standard motor mount and then redrill some 3mm holes right in the corner of the firewall and bolt it on. I’m not sure how long it will hold and to be honest I may make a new firewall from G10 and epoxy it to this one.
  2. The supplied servo mounting plates are very thin and the ply is quite weak. I found a couple of them cracked whilst I was fixing the servos. Again, some nice G10 plates would be stronger and more professional.
  3. The fiberglass servo arm extensions are a nice touch but they have been cut very narrow and from 1mm material. The holes in them were pre-drilled for the linkage stoppers and this left very little strength in them. I broke one whilst setting the throws and didn’t want to risk them in flight so I cut some new ones from 1.5mm G10.

 

All is forgiven once the prop starts spinning!

In the air the Wargo Yak 55 is a dream machine. I haven’t flow line-of-sight aerobatics for years and I felt immediately at home, even in a strong breeze that made hovering impossible. Slow flight is incredible and the rolls are so axial it’s like the plane was fired from a rifled barrel! I believe it when they say you can do anything with this model – it’s agility is far greater than the thumbs of this pilot.

With the Aerodrive 3536/1400 motor and 10×4.7 carbon prop a 1400 Multistar 3S I had enough grunt to hover at 30% throttle. 5 minutes of airtime used only 700mah so a pack should be good for 6-7 minutes of hooning around the field.

I’m really looking forward to some more flights to see what I can do!

You can get the Wargo Yak 55 from your local warehouse HERE (affiliate link).

 

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