for the ZDZ, estimated HP at 5000 rpm is 17
prop 34x16 will give about 130 km/h top speed, and close to 93 lbs thrust

for the 3w. estimated hp is 19 at 5100
prop 34x16 will give about 135 kmh, and 95 lbs thrust

At 5000 rpm, the 34" prop may already be noisy. Noise limit is about 4400 rpm.
The estimated hp may be optimistic for 5000 rm at 0.8 hp per liter engine capacity. To get this power, you need a good muffler system.