I built the Square One . The precise fit of the laser cut parts is superb , and the engineering produces a light yet rugged airplane . The wing loading is 3.1 ounces per square foot( using the AeroPet covering) which is the lowest of any glider I have ever built . In calm conditions this airplane is an absolute joy to fly . It slowly grooves through turns with a very realistic flight appearance . I am having more fun with this model than anything I have built in the last forty years . The only change I made was the addition of 5 degrees of motor downthrust to minimize trim change between low power motor on and motor off . A 2S 450MA battery gives me a 30 minute flight time at a low power cruise .
Leo Dringoli