REFLECTOR: O-540 or IO-540 on a 173

[NMFlyer1 at aol.com]

Tom, 

 Sounds like a great performer! How does it compare to stock Velocities at 
High Density Altitude take-off's?

I have a 173, and put in a 340 HP aluminum V-6 that weighs the same as an 
IO-360. Hopefully I won't need extra ballast. What prop are you using? 

Looking forward to seeing how a 173 performs at standard weight with 340 HP!.

Kurt 



In a message dated 4/30/2006 7:30:46 PM Mountain Daylight Time, 
tmartino at troubleshooter.com writes:
I have a "173 Elite RG" with an IO-540 (310 hp)

I have 50lbs of ballast in the very tip of the nose cone (upper part
with an access door).

I also have one full size battery and one small back up battery in the
nose.

When flying solo I require at least 100 lbs on the right seat.

The plane is fast and handles perfectly.

When cruising at higher speeds (200 KIAS) you need only a small amount
of nose down trim.  Most trim needed in nose up.

It is difficult to stall, recovers almost immediately before really
"breaking".  

The engine mount puts the engine closer to the firewall.  I used the top
naca vents just for cooling.  For combustion of made a lower cowling
belly "bubble" with slits in it.  Having dedicated combustion air ...
lease more than enough for cooling.

I used a four blade prop so the disk could be smaller and still get the
same thrust.

Tom  
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