Topic: Kaos

Tower Hobbies Kaos 60 ARF

New plane! A very nice ARF from Tower Hobbies, which is relatively faithful to the Kaos design. It features plug-in wings and a battery tray for electrics. I opted for the glow-power option, using the O.S .65 AX engine with stock muffler. The ARF is very well designed and has lots of options for positioning radio gear to achieve proper balance.

Mine came out slightly nose heavy, meaning I had to use the far aft option of positioning the radio gear to its fullest extent to achieve proper balance:

I did not like the way the tank tray was made because I wanted to re-route the throttle linkage underneath the tank, and so I removed the battery tray and made a new tank tray from scratch using the original parts as templates:

The finished tank tray ready for tank installation:

To achieve proper balance, I also had to install the throttle servo at the back of the radio bay along with the elevator and rudder servos. I had to lift one servo higher than another (the elevator servo in the middle, the mod is not shown in the picture) to achieve proper clearance between the elevator and rudder rod connectors.

The positioning of the battery and receiver on top of the servos is a stock option, all the parts are included. It is removable with just four screws, and it works well:

The ailerons are cut for midi-servos. I used BLS153s that I had lying around, and they fit perfectly. I added after-market linkages to suit my own taste:

Since it is a glow-powered plane I varnished the inside of the wing root, and all areas of exposed wood. I also put a thin stripe of fuel proof laquer to seal all edges of the covering and trim, something I find extends the life of any model.


The rudder vas well hinged but poorly sanded so I had to re-hinge it with a larger gap, which I then sealed with a strip of white Oracover on both sides. Benefit is a gapless and aerodynamic hinge line. I also re-hinged the elevator and sealed the gap there too, because the joiner was glued in crookedly.

Throttle installation. The measurements for drilling the hole given by the manual is NOT correct. Mount your engine first and then measure yourself. Remember you have to clear the tank tray behind the firewall!

The cylinder head must be removed in order to fit the cowling. There is a full size paper template provided in the manual, and that makes it easy to get a really good looking engine installation! Do not cut all holes at once. You do not need the hole for clearing the cast ridge on the carburetor, and the opening for the air intake is a little too far back so don’t trust the template entirely. One more thing: When positioning the engine, measure 142 mm from the rear of the firewall instead of the 140 mm stated in the manual. The two extra millimetres makes the cowling-to-spinner fitting easier to adjust.

A very nice looking plane. Well done Tower Hobbies.

I haven’t had a chance to fly it at the time of writing, so in the meantime, enjoy the pictures here.

Killer Kaos restomod part 4


The Killer Kaos is covered and painted. I used Tamiya Lexan spray cans to paint over the white Oracover. Before painting, I gently scruffed the Oracover with 1000-grit sandpaper, which makes it less glossy without scratching it.

Tamiya lexan spray paint covers well and is easy to work with.

To avoid paint seeping under the masking tape like shown above, here’s a trick I use:

Spray a coat of clear, flat paint first. If any clear paint bleeds under the tape, it won’t show, and it fills the edge so that the color coat will not bleed under. 

A perfect result

The undercarriage looked completely hopeless.

I cut the legs and added a pair of Great Planes axels. It now sits lower and has a perfect stance with clearance for up to 12 inch props.

Tettra 55 mm wheels look great

I repainted an old field box to match

Some stickers


Next up is hooking up the control surfaces in the tail, mounting engine and pipe, and the tank plumbing.

Killer Kaos Restomod part 2


This is part two of the Restomod-project. Check out the new tail (above). I made a new fin and rudder, new elevators and modified the stab tips to make everything nice and uniform. I wanted to get rid of the pointy, tall fin and elevators. It’s not radically different, but a lot cooler. The fin and rudder are almost 2 cm lower, something that will tie in nicely with the overall stance of the plane when it’s done. I have more changes in mind!

This has been a tough decision, but I’ve decided to go with a standard Kaos 40 canopy (The plain Tower Hobbies $3 canopy) instead of the long Killer Kaos canopy. It’ll be a whole new look. I wanted to loose the 1990’s styling, and this just looks a whole lot cooler!

You can see comparisons of the old and new tail, plus how it looks with the old canopy compared to the new one in the builds photo album.

Killer Kaos Restomod

kaos original
The original back in its day, about 15 years ago. I’m gonna loose the horrible 1990s color scheme and canopy and make it cool again!

I’m a fan of the Kaos series of planes and got a Killer Kaos* kit around 1998. I remember ordering it by e-mail directly from Joe Bridi, and that it was a very impressive kit with all sawn and sanded parts. He gladly offered advice on building and engine choice, although he disapproved of my choice to mount the engine upright. Well guess what Joe, that’s about to change!

I flew this plane a lot for four full summers, and learned a great deal. It was in fact the fist pattern plane that I never crashed. It was a good, solid flier. Eventually the ailerons came loose and I had plans to do a lot of fixes to it that I never got round to, other planes having taken its place as I started competing actively in F3A. It was sold to a friend in 2004.
I came across an O.S 61 SF last year and had no idea what to put it in, so I gave my friend a call, and it turned out he still had the model, preserved exactly the way it was when he got it. I bought it back, and now it’s never gonna be sold again.

So now I have a completely original, unrestored Bridi Kaos. It’s straight, light, well built (I was surprised at old selfs abilities, I didn’t realize I put that much effort into it back then) and it deserves a complete restoration. Also, I have come to realize that the spirit of the Kaos-line requires a bit of modification, so I’m gonna do that Hot-Rod builders call a restomod, which is short for restoration and modification. And I’m gonna have a ball doing it. It’s gonna be fast and not very loud, it’s actually gonna be kinda fast ‘n’ quiet!

My plans for it includes:
– New engine (an O.S 61 SF) and a spanking new Hatori 650 pipe and header
– Completely new covering and color scheme
– Lighter and better digial servos
– Rebuild the nose to mount the engine on its side
– New and different wing tips
– Individual aileron servos

Enough talk. Here are the pictures!

* Some Kaos trivia: The Kaos name was sold to Great Planes in the 80’s when they produced the Trainer 20-60, Kaos 60 and Super Kaos 40-60. After that, Joe Bridi continued to design other versions, but changed the name to Chaos with Ch. Utter Chaos and Killer Chaos to name a few. I never got used to that and so I still call all planes in the series Kaos with a K. Designed by pattern Legend Joe Bridi, the Kaos appeared in RCM magazine in 1970 and the streamlined long-nose Super Kaos with retracts came in 1973 in RCM magazine. That’s a looong time ago and it’s still cool! After Great Planes started kitting the Kaos, Don Anderson created the legendary Ultra Sport which is essentially a Kaos with a turtledeck.