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Frog 100 Mk I 1947 Cox_ba12




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Frog 100 Mk I 1947

Cox Engines Forum  :: Engines :: Non-Cox Engines :: Diesel Engines

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Post  ian1954 Sat Dec 14, 2013 2:13 pm

Frog 100 Mk I 1947 Frog_110
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Post  craig bernard Sun Jan 26, 2014 12:47 pm

Cool vintage engine have you run them! Obliously a english engine
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Post  ian1954 Sun Jan 26, 2014 3:20 pm

There are a series of them - also known as "bicycle spoke" engines. A fine vintage easy starter.

However a lot of them get damaged because the prop nut has a left handed thread. So clockwise to undo - anti clockwise to tighten up.
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Post  craig bernard Tue Jan 28, 2014 7:45 pm

Do you ever put these frogs on a aircraft and fly them or are they just shelf displays?
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Post  ian1954 Wed Jan 29, 2014 3:16 am

craig bernard wrote: Do you ever put these frogs on a aircraft and fly them or are they just shelf displays?

This engine, a long stroke diesel, is probably one of the oldest I have. I restore and run them but I doubt that I will ever install this one in an aeroplane.

This engine would be best placed in a "Vintage" free flight model.

Frog 100 Mk I 1947 43810
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Post  Surfer_kris Wed Jan 29, 2014 4:17 am

Yes, the old-school free-flight models are great for these engines. Put on a large prop and watch them putter away in the sky on a gentle climb. I'm tempted to use a single channel (rudder) on one just to be able to direct it home, rather than true free-flight. We don't really have fields for that anymore...
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Post  ekitten2 Tue Feb 04, 2014 6:03 pm

<< still flys his "old school" free fighters ...they are gr8 on a balmy afternoon
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