Chartering my boat?

I sail a Laser 4000, and have been asked by a couple of ex4000 sailors, now 49er sailors if I would hire out my boat to them for the Bandol Eurocup event.  
 
As it happens I am busy here for 3 weeks over that period so even if the boat was here I wouldn't be able to sail it, so not having use of the boat for that time isnt an issue.
 
I've pretty much decided that I don't mind chartering it out for this period, but what would be a reasonable rate for an event like this?  I have never done this sort of thing before so don't have any idea.
 
Also is there anything I should take into consideration, I know that they have insurance that would cover the boat while on the water and being transported.
 
Many thanks, Hugh

Are you positive? I think it would be quite unusual to have insurance to cover you when sailing or towing someone else's boat. Certainly for yacht-sized boats, it is the owner, not the charterer, who provides the insurance, and it is normally far more expensive than insurance for owner-only use - to the point where occassionally chartering your boat just isn't worthwhile.

The going rate for a racing keelboat valued at something like £12,000 would be around £400-£500 for a summer weekend. However that includes aspects like the use of a marina, so I guess it wouldn't pro-rata for a dinghy.

Boat is worth about £2700, and they would be using it for a 4 day event but would probably have it nearer two weeks.

Would £100 be reasonable (assuming it is using their insurance), too little, too much?  I'll double check with them about their insurance and draw up a contract and see if they're happy with it.

thanks for that.  I will print this out, take it with me and discuss it with them.

Many thanks

Hugh