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  #1  
Old 08-31-2018, 10:53 AM
RicoB RicoB is online now
 
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Location: Glendale, CA
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Default RV9a glide ratio ?

Just trying to figure out the glide ratio to put in the for Foreflight ser up. Itís a
RV9a, O320, electric MT constant speed
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  #2  
Old 08-31-2018, 11:00 AM
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Dale D Dale D is offline
 
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Location: Zeeland, MI
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Default CAFE Reported 12 : 1

Rico,
The RV-9A CAFE report listed the following:

"Best glide ratio, idle power, coarse pitch, 1738 lb, 95 mph CAS
12 to 1"

YGMV (Your Glide May Vary).

Regards,
Dale
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  #3  
Old 08-31-2018, 11:04 AM
YellowJacket RV9 YellowJacket RV9 is offline
 
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Location: Clearwater, FL / KZPH
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Default

Especially with your less common prop, there is only way to know for your specific setup, which is to do some testing. I have seen a very wide range of reported glide speeds for 9's. Ratios may be similar, but I assume you'd still want to know what speed to get that ratio.

Chris
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Last edited by YellowJacket RV9 : 08-31-2018 at 11:16 AM.
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  #4  
Old 08-31-2018, 11:14 AM
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flyboy1963 flyboy1963 is offline
 
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Default more than one?

....this from a guy who has done NO flight testing....

is there more than one?
can the MT fail in coarse, and fine pitch?
I would think you want best ratio, meaning DISTANCE....
and also minimum SINK, where distance is not as important as time aloft.

( ok, I am hard pressed to think of an emergency where you are above an airfield, and want more time aloft!)
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  #5  
Old 08-31-2018, 11:35 AM
RicoB RicoB is online now
 
Join Date: Mar 2017
Location: Glendale, CA
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Default

I will do some specific flight test on that matter but for the moment Iím tryin to get the basics of my Foreflight filled out. If I start with an average number itís agreat start.
If the electric mt prop fails it will stay at the current pitch.
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