Academy of Model Aeronautics

Brodak 25
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Author:  John Paris [ Mon Jun 06, 2016 4:41 pm ]
Post subject:  Brodak 25

Just a quick review of the Brodak 25. Lightweight at 5.6 ozs without muffler. Seemed low on compression as received but picked it up with running in. Started first flights with a Master Airscrew 8x4 and it pulled the airplane along okay. Have subsequently gone from an APC 9x4 to a 9x5 to give the Ringmaster a good feel. Running 10% Powermaster GMA I was getting good runs at 11.1K RPM with the 9x4 and 10.7 with the 9x5. The engine continues to run well at about 50 runs so far. The engine is miserly only sipping 1.5ozs for the OTS Pattern and 1.75ozs for the full pattern. May try a larger venturi at some point to see what it does but for now on the 26.5 Oz Ringmaster it seems fine.

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