Modified - Tower Kaos 40 Kit
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I’ve never been a big fan of the Kaos design because of its thick airfoil, preferring the thinner wing Kwik Fli taper wing, but years ago when Tower was still selling their Kaos in kit form I bought one and stored it away for a future build. In May of 2004 I completed the build and used an OS 46 for power. The fuselage was narrowed as much as possible and the nose section molded into the spinner to improve the aerodynamics. Although I used the wood provided in the kit the flying weight came out to 5lb 3oz.
To be continued….. |
RE: Modified - Tower Kaos 40 Kit
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The OS ran really strong but it didn’t pull the Kaos around at super ballistic speed like I prefer. Within a month of flying I pulled out the OS and replaced it with a more powerful Irvine 53 ABC. It really came alive with the 53 and has been much fun to fly. Here is a You Tube clip http://www.youtube.com/watch?v=9Zkt6pXu0rk&feature=plcp with Irvine 53 power. At that point I reconsidered what I thought about the Kaos 40 and found another kit for backup on the auction site.
To be continued….. |
RE: Modified - Tower Kaos 40 Kit
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After all these years of flying the Irvine started fading and rather than replacing it with one of my NIB 53 backups I decided to give the OS 55ax a try.
Out with the old 53! To be continued….. |
RE: Modified - Tower Kaos 40 Kit
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Installing the 55.
To be continued….. |
RE: Modified - Tower Kaos 40 Kit
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I removed the internal muffler baffle and drilled out the exit pipe on the muffler as large as possible without making the pipe wall too thin.
To be continued….. |
RE: Modified - Tower Kaos 40 Kit
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Ready to go! Flight report next.
To be continued….. |
RE: Modified - Tower Kaos 40 Kit
I have a tower kaos arf with OS55 AX APC 10 / 8 and Mac's tuned pipe its a real missile , you'll not be dissapointed with this engine.
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RE: Modified - Tower Kaos 40 Kit
I removed the internal muffler baffle and drilled out the exit pipe on the muffler as large as possible without making the pipe wall too thin. A tach reading with a completely stock OS muffler and the modiified one will surprise you, seriously. The tuned pipe, or a Jett type pipe arer a much better idea.The idea behind the tuned pipe like alcarafa is running is not about 'decreasing backpressure" or "opening 'er up". It's about optimizing that reflective wave.His motor rips, your's will be a diog ,and I'm not dogging you :). I'd think over this one a little. Doug |
RE: Modified - Tower Kaos 40 Kit
Doug,
Thanks for the input and your thoughts on the muffler. There is some debate on the net about modifying the muffler (both positive and negative) so we will see. The exit pipe size enlargement is pretty limited by the recessed ring that is around the outside tip so the size cannot be increased very much. |
RE: Modified - Tower Kaos 40 Kit
one of my tricks for good muffler performance is it to use the sf 46 muffler on the newer os engines its well optimized for max power, and is no too loud. has excellent throttle transition and mid throttle performance as well. i do prefer using a jett or nelson type for the simplest high output, the tower 46 muffler is loud and has very poor fuel consumption, it over scavenges badly.
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RE: Modified - Tower Kaos 40 Kit
ORIGINAL: lfinney one of my tricks for good muffler performance is it to use the sf 46 muffler on the newer os engines its well optimized for max power, and is no too loud. has excellent throttle transition and mid throttle performance as well. i do prefer using a jett or nelson type for the simplest high output, the tower 46 muffler is loud and has very poor fuel consumption, it over scavenges badly. |
8178,
Did you ever get the Kaos back in the air with the .55? |
Originally Posted by Pork Chop
(Post 12331633)
8178,
Did you ever get the Kaos back in the air with the .55? Mike |
If you were going to do it again would you drill out the exit pipe on the muffler? I have a Tower Kaos (ARF) with a OS-55 on it too but with the stock muffler. Just curious what the advantages are?
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Originally Posted by Pork Chop
(Post 12333490)
If you were going to do it again would you drill out the exit pipe on the muffler? I have a Tower Kaos (ARF) with a OS-55 on it too but with the stock muffler. Just curious what the advantages are?
Mike |
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