Pylon Free Flight Power?

[ricardo]

Any aerodynamicists out there who can explain the rationale behind Pylon Free Flight Power models?

It seems to me that this encourages the model to loop.  It might be this is necessary for old locked down power models with spiral climbs but anyone know if this is the case and explain this mechanism?

Today, with auto everything, are Pylon Power models and spiral climbs still relevant?
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It took me a long time to realise that a model in a Right Spiral Climb has to Roll to the Left while trying to loop. 

[glidermaster]

Last point first, modern models have the wing about as low as it can be.

Pylons - lift the wing out of the prop wash, generate a right swing on launch which with the up-couple resulting from the thrust line passing below the c of g encorages the right spiral climb to start before the speed builds up and the aerodynamic influences take over.

A diagram or two would help, but over to some one else.
Hepcat, are you out there?

John

[RobinB]

""It took me a long time to realise that a model in a Right Spiral Climb has to Roll to the Left while trying to loop.""

You're not alone there, Ricardo 

We don't exactly help ourselves to get that - we use the same words ('left' and 'right') for both turn and roll.
If we think of roll in clockwise terms instead, and just use left and right to describe turn, we can mentally separate
turn and roll more easily.

Robin

[danberry]

Today, with auto everything, are Pylon Power models and spiral climbs still relevant?
_______________

It took me a long time to realise that a model in a Right Spiral Climb has to Roll to the Left while trying to loop. 

They are relevant if you fly events that do not allow asphalt on the planes.
Or....if you don't care for flying remotely controlled planes as Free Flights.