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Old 02-21-2017, 10:30 PM
DNeufeld DNeufeld is offline
Join Date: Aug 2016
Location: Coeur d Alene
Posts: 61
Default Airspeed Error

Hi everyone, New guy here. Bought a very nicely built RV6 in September and now have the RV grin! One problem though, it does have a significant IAS error. About 10 knots fast at 170kts TAS both AS indicator and has a RMI indicator showing the same error. I did have a static leak inside the plane, fixed that, thought that would be it but only dropped about 3kts. Static is at the pitot-static tube mounted at the typical place under the left wing and extends down the same amount as a fiends RV4 that does give known good indication. I checked the static ports around the pitot, all clear. Thinking this thing might not like the static taken under the wing?
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Old 02-22-2017, 07:04 AM
rvsxer rvsxer is offline
Join Date: May 2007
Location: Inver Grove Hgts, MN
Posts: 248

Hi and welcome to Van's Air Force! I have a Piper pitot mast on my RV-6 (that was the cheapest option for a heated pitot at the time) and the static source never worked right. I finally installed the plans-specified static ports and my airspeed is within 1% now.
Mike Hilger
RV-6 N207AM w/G3X, 1,400 hours +
South St. Paul, MN (KSGS)
Senior Tech - Panel Design, SteinAir, Inc.
A&P, EAA Tech Counselor

We're all here because we're not all there...
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Old 02-22-2017, 08:35 AM
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snopercod snopercod is offline
Join Date: Aug 2016
Location: Asheville, NC
Posts: 1,001
Default I added dams in front of static ports

I had the same problem when I first started flying my Lancair 235. On my first landing, I floated a full 4,000'! To solve the problem, I added little "dams" in front of the static ports (I have one on each side). Now, from flying wind triangles at various speeds, my ASI appears to be right on between 80 KIAS and 140 KIAS. YMMV.

(2018 dues paid)
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Old 02-22-2017, 10:13 AM
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JonJay JonJay is offline
Join Date: Jan 2007
Location: Battleground
Posts: 3,729

Common problem whereby I have never heard of a location that worked as well as following the plans and putting them on the side in the location specified. Also, as silly as folks sometimes think the pop rivet (as per plans) isn't "robust or professional enough" it works very well. The shape of the pop rivet head is part of the recipe. There have been lots of
problems reported when deviating from the plans here, especially location.
Smart People do Stupid things all the time. I know, I've seen me do'em.

RV6 - Builder/Flying
Bucker Jungmann
Fiat G.46 -(restoration in progress, if I have enough life left in me)
RV1 - Proud Pilot.
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Old 02-22-2017, 09:22 PM
DNeufeld DNeufeld is offline
Join Date: Aug 2016
Location: Coeur d Alene
Posts: 61

Thanks for the help everyone. Next annual I'll try it at Vans location and the pop rivet. See how that goes. It's close at low speeds so it can wait a couple months.
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