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Old 06-25-2009 | 12:25 PM
  #24  
hezik
 
Joined: Aug 2006
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From: VleutenUtrecht, NETHERLANDS
Default RE: Tournoi de Champagne

Generally, yes it does. Offcourse also depends on what you find viable for 3d performance

If you have a plane that can do all 3D maneuvres, it can end up underpowered for F3A.

The reason for this is simple, in F3A you want to portray a single speed during your entire flight. So you want to fly the same speed vertical as level, at least, optically.

Suppose you're having reasonable winds (4bft) and are doing an inward looping from the top line, starting in the wind. Up to 3/4 you'll be fine, but you will need A LOT of power to get the looping nice and round and with the same speed for the last 1/4.

On electric planes:

150 Watt/kg - normal flight, not unlimited vertical, but it'll fly fine
300 Watt/kg - 3D capable
> 500 Watt/kg - F3A capable.

Most 3D flyers want more than 300 watt/kg, F3A pilots usually go for something like 600 watt/kg.

Take for instance the Plettenberg F3A engine, it can deliver 3.5kW of power. On a 5kg plane, that's 600Watt/kg..