How to cool an outboard motor without using water? Answered
I am wanting to build a personal ultralight helicopter. First issue here is to find a suitable engine. Outboard motors have the 40+ horsepower I need and can be found pretty cheaply on places like craigslist.
One thing I know about these engines is that they use a water pump to suck up water and cool the engine. It is important that this water is present and can the engine can be wrecked if it is run without water for more than a minute or two.
Short of including a water tank on this helicopter, do any of you have any practical solutions to keep an engine like this cool?
(Just so you know, an "ultralight" helicopter must weigh under 249 pounds without the passenger. In the US, you can fly ultralights without a pilots' license. 40hp outboard motors weigh around 160lbs so I don't have a lot of room for heavy water.)