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  #1  
Old 04-15-2018, 08:43 AM
Chippster1 Chippster1 is offline
 
Join Date: Aug 2011
Location: Marietta, Ga
Posts: 44
Default Speed and tie down rings

Here is an experiment I have not tried, but Iím sure many already have.
Does anyone have any speed data with rings in vs out?
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  #2  
Old 04-15-2018, 09:20 AM
Mel's Avatar
Mel Mel is offline
 
Join Date: Mar 2005
Location: Dallas area
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Default

I've flown my -6 with and without tiedown rings installed. I can see absolutely no difference in speeds. I normally remove them simply because it looks better/cleaner.
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  #3  
Old 04-15-2018, 09:50 AM
rocketman1988 rocketman1988 is offline
 
Join Date: Jun 2010
Location: Sunman, IN
Posts: 1,022
Default rings

From an engineering standpoint, you could probably calculate the drag increase, however, from a real world perspective, that increase will likely be overshadowed and basically undetectable...unless your rings are flat plates facing the direction of flight.

Sounds to me like you are interested in a really fast plane. The RV-10 is a really wonderful all around aircraft but there are faster designs out there. Kind of like asking how to make a C-172 go faster; the answer is buy a different plane...
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  #4  
Old 04-15-2018, 10:24 AM
Chippster1 Chippster1 is offline
 
Join Date: Aug 2011
Location: Marietta, Ga
Posts: 44
Default

Quote:
Originally Posted by rocketman1988 View Post
From an engineering standpoint, you could probably calculate the drag increase, however, from a real world perspective, that increase will likely be overshadowed and basically undetectable...unless your rings are flat plates facing the direction of flight.

Sounds to me like you are interested in a really fast plane. The RV-10 is a really wonderful all around aircraft but there are faster designs out there. Kind of like asking how to make a C-172 go faster; the answer is buy a different plane...
Actually, I totally love my RV-10 and would never part with her.
What I really am is fascinated with aerodynamics and a would be Aerospace Engineer who went to Dental School!
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  #5  
Old 04-15-2018, 10:26 AM
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N941WR N941WR is offline
 
Join Date: Jan 2005
Location: SC
Posts: 11,443
Default

Regardless of any perceived speed penalty, don't leave the three rings in place. Dissimilar corrosion can and will occur.
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  #6  
Old 04-15-2018, 10:50 AM
rocketman1988 rocketman1988 is offline
 
Join Date: Jun 2010
Location: Sunman, IN
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Default Corrosion

Are you also accounting for the corrosion that will occur at EVERY place in the aircraft where there are dissimilar metals?

Check this chart out:

https://www.pemnet.com/design_info/galvanic-corrosion/

Note that the closer the metals are to one another on the list, the less corrosion potential exists. Looking at Aluminum, we find that mild steel is on one side and cadmium is on the other. This means that although there IS a corrosion potential between these dissimilar metals, it is comparatively very small. The potential is typically dependent upon an electrolyte (water) as well. So if you were to use a mild steel or Cadmium plated steel ring, there won't be much of an issue. Further, if you were to apply a thin coat of grease or anti seize to the threads, you in effect prevent the incursion of water which reduces the potential for corrosion even further.
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Aerospace Engineer '88

RV-10
Structure - 90% Done
Cabin Top - Aaarrghhh...
Doors - Done
On Gear
290 HP Barrett Hung
ShowPlanes Cowl with Skybolts Fitted - Beautiful

Dues Paid 2017,...Thanks DR+
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