REFLECTOR: Take Off Performance

Scott Derrick scott at tnstaafl.net
Sun Apr 9 17:16:10 CDT 2006


I say yes to everything Kurt  says.  I am going to try to do this high 
altitude, hot, high density TO magic with a fixed pitch Catto. But, I 
will have 325 Turbo Charged HP, which should give me every HP it can 
muster on TO with no reduction for altitude or high temps.

I have  flown into  Kurt's home field a few times and I use all the 
runway,  with just me and fuel.  I CS prop would make a huge difference 
and if there was a rock solid , good  customer service, reasonably 
priced one I would have tried that before the ending upgrade. I love 
operating with a CS prop.

Kurt, you probably have lots of helping hands around your place but I 
would be more than willing to come hold an extinguisher and and provide 
some close eyeballs on the engine for  your first start. Just give the word.

I've finally moved out of winter mode,  cleaned up the hanger around my 
plane today and even did a some glass work in final prep to hang the 
engine! 

Scott


NMFlyer1 at aol.com wrote:
> When I went to the last Texas Velocity event in TKI, I was amazed at 
> how much runway Velocities took to get off the ground. It wasn't very 
> hot that weekend, and the field elevation was much lower than here in 
> New Mexico.  That weekend was an eye opener for me, and caused me to 
> go with my current engine choice (340 HP 4.3L, Aluminum V-6 Chevy).
>  
> Since my field elevation is 4800 MSL, density altitude (DA) is always 
> a concern. On a summer day out here, about 25% of your horsepower is 
> gone, just to DA, and that doesn't include the effects on prop and 
> wings. If had put a 200 HP IO-360 in my 173, I would be trying to take 
> off from a 4300' runway, in a canard, with 150HP (on a good day) high 
> and hot,... NOT a good idea... just ask Scott... he's been in here a 
> couple times. Notice he is changing engines in his V also.
>  
> So my plan for high DA takeoffs here has many parts:
>  
>     More Horsepower!!! That should get me to takeoff speed much faster.
>  
>     Lots of torque, and a huge 76" 3-blade constant speed prop.
>    
>     The 173 Wing, for slower T/O & Landing speeds, and better high 
> altitude performance.
>  
>     I left the Elevator cuffs off. Am putting the VG's on.
>  
>     I reworked the rudders. I have about 2.5" deflection before the 
> brakes touch.. and over         5.5" total rudder travel. That should 
> help on takeoff and reduce brake use on takeoff &         crosswinds.
>  
>    
> Wish me luck. I pick up my ceramic coated exhaust tomorrow and finish 
> up the engine monitor wiring this week. Pretty close to engine 
> start... finally.
>  
> Kurt
>  
>  
>  
>  
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