The last section of the RV-10 Construction Manual is entitled "Final Inspection and Flight Test." Page 21, last paragraph, lists flap speeds:
"On the RV-10, 140 mph statute for "trail" (3 degree deflection), 110 mph statue for "1/2 flap" (18 degree deflection), and 100 mph statue for "full flap" (33 degree deflection)."
At Airventure this year, Scott McDaniels told me Van's is rewriting this section to remove the RV-10 "trail" speed restriction. Van's engineering, he said, has determined that flaps can be in reflex or trail (-3 degrees or zero degrees) up to Vne.