RE: Extreme Flight Vanquish 2m Build Thread
Have you added up all the weights (including servo, drive battery, and so on) to see what you're getting at? From the weights mentioned in the startpost, and taking into account that that engine should do about the same as the plet, you'll need 5000mAh packs, will you keep it below 5kg?
If that engine is indeed a plet copy, you might consider trying/using the RASA props.