You need a rounded leading edge otherwise the airflowover the wing will be badly affected and the planewill be difficult to fly.

Sounds like you have a semi symetrical wing - see what shape the plan isshowing and copy it.

I've overheard once a conversation on this topicwhere the guy told the other - quote "boy, you gotta shape 'emleading edge kin of round else the bugs will fly in themflat surface and make them plane heavy - and itwill kin offalland you will crash" unquote.....

Cheers