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  #1  
Old 07-04-2022, 09:18 AM
HansLab HansLab is offline
 
Join Date: Jan 2015
Location: Netherlands
Posts: 155
Default glidescope

Anyone tried engine-off thermaling yet with their 12?
Restarting by diving speed is one exercise I still have on my list, and I'm curious what the glide scope of this beauty is? Engine off, so little drag from the prop.
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  #2  
Old 07-04-2022, 01:07 PM
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Aviator Aviator is offline
 
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Location: Chattanooga, TN ( Chattanooga)
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Default

Are you talking about glideslope?
A glidescope is what we guys use to intubate a patient.
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  #3  
Old 07-04-2022, 09:30 PM
RFSchaller RFSchaller is offline
 
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Make sure you have a good story made up for the NTSB if there’s an issue!😝
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  #4  
Old 07-04-2022, 09:52 PM
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koupster koupster is offline
 
Join Date: Dec 2013
Location: SLC, UT (KBTF)
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Default Glide Slope Ratio

Hans,

Your English is way superior to my Dutch, which is limited to just a few words.

Most of us in the US refer to the Glide Slope Ratio as just the glide ratio. NASA, however, uses the term Glide Slope Ratio.
https://www.nasa.gov/pdf/582952main_...xplanation.pdf

If you don't get a good answer to your post, ask again in a separate post.
Suggested title, "RV-12 Glide Ratio ?"

Veel geluk.
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  #5  
Old 07-05-2022, 02:45 AM
amekler amekler is offline
 
Join Date: Aug 2009
Location: Gilford,NH
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Default

Quote:
Originally Posted by HansLab View Post
Anyone tried engine-off thermaling yet with their 12?
Restarting by diving speed is one exercise I still have on my list, and I'm curious what the glide scope of this beauty is? Engine off, so little drag from the prop.
I believe van's states 13 to 1
Alan
N603NH
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  #6  
Old 07-05-2022, 04:13 AM
Tooch Tooch is offline
 
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Location: Amelia, Va
Posts: 338
Default Rotax

I don't think you will be able to restart the Rotax without using the starter. Not enough RPMs.
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  #7  
Old 07-05-2022, 05:26 AM
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Piper J3 Piper J3 is offline
 
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I doubt you can restart Rotax 912 by reverse-driving the prop in a dive. Engine has 2.41 gear reduction and high-compression. I wouldn't attempt it....
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  #8  
Old 07-05-2022, 09:05 AM
seagull seagull is offline
 
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Location: Highland, CA
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Quote:
Originally Posted by Piper J3 View Post
I doubt you can restart Rotax 912 by reverse-driving the prop in a dive. Engine has 2.41 gear reduction and high-compression. I wouldn't attempt it....
Not that it matters in this discussion but I am pretty sure all the 912ULS 100hp engines were 2.43:1.

This is a video of the Remos GX doing an air restart. They don't say but the 912ULS is the standard engine on that plane.
https://www.youtube.com/watch?v=VwPAiuu1dxw
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  #9  
Old 07-05-2022, 10:30 AM
moosepileit moosepileit is offline
 
Join Date: Dec 2010
Location: Louisville, KY
Posts: 806
Default

Is there a slipper clutch? If so, is it designed for intentional, non-feathering propeller use?
Glide ratio is how far you can go, no wind.

Minimum sink speed best exploits weaker thermals/lift sources.

Airliners have decent glide ratios, but high L/D speeds, high min sink speeds, and high sink rates- so it would take decent mountain wave or one heck of a thermal source to climb.

I can always find just enough to make me work at being stable on short final/s

ETA- In the above Remos video the prop stopped at 65 knots at 11000+ feet MSL and restarted the engine with the key in both around 115 knots. No idea how the prop pitch and diameter compares to a RV-12.
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Last edited by moosepileit : 07-05-2022 at 10:37 AM.
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  #10  
Old 07-05-2022, 11:28 AM
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Gagarin737 Gagarin737 is offline
 
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Hans have you already seen this video? ; https://www.youtube.com/watch?v=_xZmsxEewik
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