By 2.4kg do you mean 2.4kg cm? If so they would be powerful enough, but may be a little slow, but if it's designed well then it would be fine, and with a brushless you need the right speed controler, so do you have the web links for the parts? As it means people can check to make sure the parts would work well together. And instead of making topic after topic in the future, just ask your questions on this one.