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OK, thanks for recommend - sorry for late reply...

Water, waves, wind, FISH - LOL! I know what you mean. :) Another one is small leaves, blades of grass and such that seems to converge right in front of your boat for no logical reason and getting wrapped around the prop. ;) Anyway, by top of the boat, I meant having the esc outside on top of...

@ LibertyMKiii. Thanks again for your advice. Higher speeds would be ideal which is why I was erring on the higher-specs you mentioned, especially as you suggested that the setup in the youtube clip wasn't doing even 40 mph and I'm looking at 45-50 mph. Plus, once the weight of the deck, the...

@ tntpoof, thanks for your reply. The EDF will push the bow down a bit and I'm also thinking of using trim tabs to prevent bobbing or porpoising, but you think I would need a down-force wing as well? Near the front of the boat? As A123 batteries are a lot heavier than LiPo or NiMh one's...

Right, so 6 LiPo cells (22.2 V) at 5000 or 6000 MAh and a 120-180 amp ESC with BEC. I now realise that a 70 amp ESC certainly wouldn't do it, and why it should be LiPo and not NiMh, so thanks for putting me straight on those things.

No, maybe it's going 30-ish mph or so, but still something to gauge my attempt by. Anyway, how many cells can I go for with say a 70A esc and should they be LiPo's or NiMh's? Oh, and what MAh figure?

Yep, I agree angle of attack is a main factor, so I'm thinking of some sort of mount that allows me to adjust the position of the EDF. This youtube clip shows a setup using a 90mm EDF and it seems to run OK. Here's a pic of the hull. Thanks for your help :)

Any tips, advice for an EDF powered boat build? The hull is a 3-foot shallow V and although I have a rough idea of what to do, I will need pointers as to the power chain to achieve speeds of say 45-50 mph. So cell type, how many, what MAh and also ESC specs. I've seen a few youtube clips that...