Wow, I didn't realize is was 23" long,(584mm) I expected it to be around 17" (430mm) or smaller.

Where is your center of gravity at in relation to the back of the front sponsons or in relation to your turn fin?

Your turn fin does not appear to be a hydro fin. Is it hooked at all or straight?

Usually for the placement of the motor I take about 33% of the length. So for a hull around 23" it would be 7" (175mm) absolute minimum from the rear. 1/2 would be much more ideal

All my rigger layouts front the front of the hull are in this order.
1) LiPo
2) ESC
3) Motor
4) Radio/Servo

3000kv on 7.4v LiPo is quite weak for a rigger or even a mono. unloaded - 22000RPM
What size 7.4v pack is this? C rating?
Usually I aim for around 35 000-40 000 Unloaded RPM for a well built rigger hull. Others choose to go with less unloaded RPM which works as well.

What kind of estimate speeds did you achieve?

And lastly what prop was used? Diameter/Pitch

A lot of question, I know, but we'll get this thing moving. If it is in fact 23" long there is no reason it should be running less than 40 mph or 64km/h on 2 cell 7.4v LiPo with the right setup.

Ryan

EDITED motor placement