boat wants to roll over under power

[haggis]

tried my new mono hull batboat today,

wickedly fast, terribly unstable and as soon as you put more power on it just rolls over.

its so bad i managed a full barrel roll and ripped the canopy off.

do i need trim tabs or is it a prop issue?

i think its because i have too much prop in the water.

i tried running her with the lipos on one side but it made next to no difference!

[dana]

Prop issue I think. What size hull and which prop? Motor and batteries?

[haggis]

Prop issue I think. What size hull and which prop? Motor and batteries?

It's a graupner b24, huge turnigy 2000kv in runner which is far too big fOr the boat. It's on 4s and has an octura 435 3 bladed prop on home made stern drive.

The shaft of the prop sits in line with the bottom of the boat if that helps.