REFLECTOR: Props ...

[Jim Sower]

Scott,
Where'd you get 180 ktas?  You got an RG?  If not, I'm humiliated.  Mine 
(w/o wheel pants) won't do a yard over 150 kts.  I have to file 145 or 
140.  It's embarrassing.  Looks like I might have to bite the bullet and 
do all that work and install a 220 hp Mazda. 

Love the engine, hate all that work ... Jim S.

Scott Derrick wrote:

> Jim,
>
> "I had" the same engine, rated 200HP.  I was running a Catto, 64x74.  
> I would get 2350 static, and WOT 8000,  2800 RPM, 180 KTAS. That was 
> with a LSE ignition which I think added to my performance.
>
> I never cruised at 2800, I would normally cruise at 2700-2750,  at apx 
> 175 KTAS, 75 LOP.
> You could cut a 1/2 inch at a time, off of it,  and see how it 
> increases your RPM?  2550 WOT is definitly over propped. You get that 
> static up to 2350 you'll cut 500+ ft off your take off roll.  Your 
> cruise speed would be less because of your bigger wing.
>
> Scott
>
> BTW, my prop with a Saber 8" extension is for sale $1500 + shipping.  
> 300 hours. I'll put a new coat of PPG on it before shipping. You pick 
> the tip color.
>
> Jim Sower wrote:
>
>> All,
>> I am running an angle valve IO-360 with a Catto 66x72 on my 173-FG.  
>> I find I'm overpropped about 200 rpm,.  I get 2200 - 2250 static and 
>> 2500 - 2550 WOT at >8000'.  I think I'd be a lot happier with closer 
>> to 2400 - 2450 static and 2700 or more at 8000'.
>>
>> Who's got a similar engine, what kind of prop are you using, what 
>> static and cruise (>8000' WOT) rpm are you getting?  I think my 
>> engine's pretty sorry, but I don't have any other data points from 
>> similar engine prop combinations.
>>
>> Thanks in advance ... Jim S.
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