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

[Tom Martino]

Kurt,
 
You're V will run circles around mine ... just because of the weight
advantage!
 
You're right, you won't need ballast.  
 
As far as density altitude goes ... here where I'm based (FTG 5580 ft.
elevation) on a hot day Density can reach around 7,000 to 8,000.  On the
worst days ... I take off at around 2500 ft.  I could push it to rotate
sooner, but I don't.
 
-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of NMFlyer1 at aol.com
Sent: Sunday, April 30, 2006 8:59 PM
To: reflector at tvbf.org
Subject: Re: REFLECTOR: O-540 or IO-540 on a 173
 
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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