Servos....HS5925 or JR8231
SUKAHO-SUKHOI,
Kind of skeptical in what this guys says -- obviously doesn't really know what he's talking about.
What giant-sized park flyer are you running with HS-81s. The HS-81 is not a park flyer servo. The Hitec park flyer servo is the HS-55. The HS-81 is typically used for 1/2A to .15 sized airplanes or high-speed electrics. The MG versions of this servo is popular with the COMBAT flyers.