Quote Originally Posted by Bill Berson View Post
The floor of the class E "extensions" should logically be higher than the surface. Perhaps 400agl or something for drones and ultralights to operate without prior permission.
Because IFR traffic is always higher in the extensions (just like the class B inverted wedding cakes)
The rules for class E airspace are so poorly defined in AIM or the chart or anywhere, it's appalling.
Though may not be obvious at first sight, the floor of the Class E "extensions" is definitely the surface. Look at any of the E3 and E4 airspace descriptions in FAA Order JO 7400 -- https://www.faa.gov/documentLibrary/...O_7400.11C.pdf

I know, it's a can of worms. If you want to read about another possible can of worms re model airplane flight, see a related discussion here. However, I need to emphasize, the apparent problem here is in the words of the authorizing congressional legislation-- not the FARs. The actual FARs have not yet been codified, or at least have not yet been released to the public. -- https://www.rcgroups.com/forums/show...er-E4-airspace

Steve