I got my CD this year, and am hosting my first club event, our annual Big bird Fly in here in Waco this year,, as always Turbines are welcome,, but I have done some searching and can not seem to find any answer to my question about accepted sizing

usually for a big bird event the monowings are min. 80 inch wingspan, and biplanes are 1/3 scale or larger, However I can not find any info as to what dictates a " big bird jet' I know that my 1/6 f16 is a large jet, but the wingspan on it is about 66 inches from missile edge to missile edge, so technically it is not 80 inches. However I thought I read somewhere that the turbine jets were measured differently for such events, using length or scale,, I just cant seem to find any real info on what Is technically considered a "BIG BIRD" turbine jet for events... I know that some of you know the exact details,, Thanks fellas

I believe that From the IMAA rules for a jet to qualify, the length + wingspan must equal or exceed 144". This was an old rule and with the closing of the IMAA, may not even be a factor.

As the CD, and as there is no IMAA any more, it's really up to you.

The old guidelines were 80" monoplane wing span, 60" biplane, or true 1/4 scale. Jets were length plus wingspan = 140"

A fun example is a 1/4 scale F-104 only has a 65" wingspan but its 14 feet long!

Our club tossed this around recently and decided to use a 60 inch wing span for the big bird fly, in order to encompass most jets, and all the 25%, plus getting participation from the 60-90 size planes out there.. so it keeps the little stuff out.. However, there will likely be after hours time near sunset for foamy/edf flying, as long as no bigger stuff is flying..

They informally take turns between groups of like types.. it works out pretty well..

Amazing what happens when adults act like adults eh?

+1 (Goose and I belong to the same club) We just wanted to limit the small foamies during the event.

That's the rule of thumb around here and I use on the events I C.D.


Danno