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  #61  
Old 12-24-2010, 10:02 PM
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G34U G34U is offline
 
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Thanks for the both info. I believe I will call stein.
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  #62  
Old 12-25-2010, 07:17 AM
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Brantel Brantel is offline
 
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Those are the ports I have and while the kit is awesome, I had poor accuracy. Your results may vary. I think it is hit and miss with any off the shelf solution. It takes verification and fixing if needed.

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Originally Posted by Bill.Peyton View Post
Well I just ordered the Safeair1 static ports and are going to give them a try. I spoke with them and they claim that they are machined to replicate the Pop rivet and to sit at the same distance from the fuse as the Pop rivet style. They also came with the snap fittings, tubing etc for both the pitot and static system, and have a compression connection to the port. Time will tell how accurate they are.
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  #63  
Old 12-31-2010, 07:32 PM
Bavafa Bavafa is offline
 
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I just did a static test by doing a low pass and my the result was not what I had hoped. My altimeter drops about 70-80 feet at around 100K.
My static ports are flushed with the skin, so I am going to change them to a slightly raised and see how that will work.

Any one has a good reference as how much it should be raised pass the skin in a RV7?

Happy new year to all.
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  #64  
Old 12-31-2010, 09:04 PM
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Our new design ports stick out .030"
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  #65  
Old 01-01-2011, 08:59 AM
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Quote:
Originally Posted by clevtool View Post
Our new design ports stick out .030"
So they are .062" proud so that when installed in a 0.032 skin they protrude 0.030?
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  #66  
Old 01-01-2011, 09:07 AM
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Those side skins are 0.025. And assuming you don't put any primer on the inside of the skin (I did initially but later removed it with scotchbrite in favor of alodine) they'll poke out 0.030.

Phil
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  #67  
Old 01-01-2011, 10:01 AM
Bavafa Bavafa is offline
 
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Phil,
Are you flying and if so, how is the result with 0.030 protruding out?


Thanks and happy new year
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  #68  
Old 01-01-2011, 10:44 AM
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No, I'm not flying. I'm still in the phase of creating problems.
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  #69  
Old 01-01-2011, 11:55 AM
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I think this is posted elsewhere but for convenience I will go through the history of this again.

For well over a decade we made static ports with flat faces. These were intended to mount on the inside of a bare skin. They had a .025" step on them that transitioned into a 45deg. taper up to an ultimate thickness of .035". We had zero complaints about the ports until the RV-10 kit came out. Either due to different airflow, or more sophisticated and redundant ability to monitor the system, their became and issue. As I remember a builder added the head of the pop rivet in van's kit to the face of our port and the problem was minimized. This indicated that the port was not far enough into the airstream. Listening to several other builders we concluded that the ports were often installed different than the intention. I will separate out the common mistakes for those who like to skim.

First is the primer. Builders have transitioned in the last two decades from keeping the skins bare on the inside to various methods of surface protection. This adds thickness and commonly even more thickness at the edge of the hole where the port is attached. Some even primed the port itself adding twice the thickness. The thicker the primer the less the port sticks out.

Second is adhesive. Many builders attached the ports with RTV or proseal rather than riveting them onto the inside of the skin. This obviously adds thickness as well.

Third is painting. Builders would often mask the port when adding paint (sometimes a lot of paint) to the exterior. It is recommended that the ports be painted unless a provision is made to allow them to protrude further to allow for paint.

Fourth is countersinking. Seldom but still present were builders that would countersink the port, but not deep enough to accept the skin dimple. The port would sit on the dimples rather than the skin.

The net result of any of these mistakes was that the flat face of the ports would not protrude out the intended .010" into the airflow. We added the dome to the port in hopes that it would stick out far enough regardless of how the builder installed it, now there is a 0.025 step with a 0.035" height radius that should protrude from any finishes added to the surfaces. We have not had any complaints since changing the design. I can't speak for other manufacturers but I am guessing that any errors are resulting from similar installation problems. Please let me know if there are other questions, or if anything here is not clear.

Thanks,
Mike
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  #70  
Old 01-01-2011, 03:57 PM
Bavafa Bavafa is offline
 
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Mike,
I appreciate the write up and good explanation. As mentioned in my earlier post, I have just found out that my static port which is flushed to the skin (it is a Philips screw that I drilled a hole in the middle of it) is causing about 80 feet of altitude error (lower) and my IAS being lower then real airspeed using the GPS method. I am very interested in your ports, only thing that my plane is painted and I really don't want to use rivets (again due to paint) and gluing them obviously will change the designed amount that it protruded out.

So, just wondering, do you make different sizes of static port that would account for such installation and are these made more specific for RV10 or would it work just as good in a RV7A?

Thanks again for all the info.
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