What a drag ! : )

I read that originally VmaxProbe was intented to fly with 0.31 sq ft drag . Later drag rose to 0.45 sq ft still the lowest drag ever recorded in an propelled aeroplane ( in fact in any manned aircraft ) when plane had no retracts.

I wonder how the 0.31 was obtained ?

Ok I assume short laminar wing with very little wing area and NACA studied fuselage.

I did my calculations based on AR-5 calculation of B. Carmichael and I got 0.339 for my AC and if lucky in foil selection then 0.318 ( due to overall smaller size [ weight also ] of the plane and use of retracts ). I assume pilot would have to lie down in prone position to go under 0.300 in drag ?

In theory it could be..here is my prone position flown lifting body twin pusher fan ( drag 0.277 sq ft when some interference added):

This drag of going under .280 is interesting if you check nomograph in my earlier topic ( calculations in Bruce Carmichael style ) you see that I could get 170 mph speed with just 5 hp and 275 mph with 50 hp ( possibly 300 mph when enhanced ). That is why I say here again as I said before...never to build this small lifting body plane...it has very difficult bale out changes ! This is just an example of what can be done with lifting body ( in bigger scale ). This could be propelled with two inline 2 cylinder 2-stroke 20 hp APT engines. Plane woud have ram-air cooling and retracts ( taildagger ). This would require extensive windtunnel testing to find the proper size and form for the fuse and wing.

The extremely low drag coefficient is reached with a laminar flow: http://www.aviation-history.com/theory/lam-flow.htm ( Bruce Carmichael used coefficient 0.0029 for the fuse of AR-5 )