Had a little talk today with Klause about his takeoff performance.
He claims he can climb on his fixed pitch prop at 1000 Feet Per Min
from 100 to 150 Kts at 2150 RPM.

He is running a modified O-200 with what I would guess to
be about 140 HP max. The HP at 2150 RPM is probably
down around 100 HP.

If his gross weight is 1000 pounds on his Vari-EZ this climb
rate at 100 KTS indicates an excess real thrust HP out of 
the prop of 30 HP.  

Climb rate in FPS times gross weight divided by 550.

This HP is over and above the HP it takes to overcome  
induced drag, skin friction and form drag at this speed.

Since Perry is down to an accelleration of only 0.05 G at 90 KTS
on the ground his airplane is near top speed without any 
normal increase in induced drag you get when climbing 
out of ground effect.

This can only mean his duct and fan setup is very, very inefficient
indeed at this speed which of course jibes with convential wisdom.
This is also assumming he has 115 HP out of the engine at
4300 RPM of or so.
  
Paul Lamar
 
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