The RTTL hull is a displacement hull, NOT a planing hull, but she will lift with suffiocient power.
2 x Buhlers on 24 volts had mine planing, these motors are a lot less powerfull than a 26cc petrol engine.
The RTTL's only had a top speed of 21 knots on emergency power, 110% rated output and could only use this for a max of 20 mins.
Bob