Hi Dave Here is my 2 cents worth, a few extracts from my WEB page.
My belly board does increase my rate of decent (a lot) and does improve vision over the nose (both are easily achieved by side slipping). You could not pay me to do it again nor would I add it during building (what a waste of time, money and worst of all, weight). I would consider manually operated flaps and especially flaperons. See http://www.athertonairport.com.au/kr2/KR2BellyBoard/index.html for details on my build and more comments. Regards Barry Kruyssen http://www.athertonairport.com.au/kr2/index.html