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11-01-2013, 09:57 PM
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Join Date: Oct 2007
Location: Canada
Posts: 100
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RV-14 empennage interchangeable?
I just finished watching Ken K's youtube walkaround of the RV14. What stuck with me was when he said the 14's tail is externally identical to the 9's but internally it's built more like the 10, beefed up to handle the increased speed/loads. The 14 tail will bolt right onto a 9 and weighs 1lb more. I wonder how long until we see some 14 tails up for sale. It might make a nice safety upgrade. Not gonna mention aerobatics nope, not a word. Flamesuit on.
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C-GVMK
RV9a Slow(ly) built
Flying as of July 2012
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11-02-2013, 01:08 AM
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Join Date: Nov 2007
Location: Yarmouth, Nova Scotia
Posts: 2,408
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Since that video was made, Van's has made changes to the tail, that is my understanding as to the delivery delays. The bolt up pattern might not have changed so that statement same as the nine might remain, I don't know.
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Thanks Ron
RV-10 SOLD
RV-14 Flying
AirCam flying
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11-02-2013, 01:57 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Quote:
Originally Posted by Beancounter
I just finished watching Ken K's youtube walkaround of the RV14. What stuck with me was when he said the 14's tail is externally identical to the 9's but internally it's built more like the 10, beefed up to handle the increased speed/loads. The 14 tail will bolt right onto a 9 and weighs 1lb more. I wonder how long until we see some 14 tails up for sale. It might make a nice safety upgrade. Not gonna mention aerobatics nope, not a word. Flamesuit on.
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Surely you wouldn't believe that if you doubled the existing load capacity of one section/span of a five section/span bridge, that it could be considered capable of supporting a truck twice as heavy, across the full length?
On an RV-9(A), many other portions of the structure would have to also have be beefed up to give it the same aerobatic capability as the RV-14
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Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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11-02-2013, 04:58 PM
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Join Date: Sep 2009
Location: Rochester, MN
Posts: 710
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I'm not following you Scott. Basically asking whether one can use an RV 14 tail on an RV 9 and appreciate some increase in strength at any point (not all) on the plane. If so, why not make the substitution if it's only a pound heavier?
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11-05-2013, 09:50 AM
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Join Date: Jan 2005
Location: Twin Cities, MN
Posts: 1,565
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Quote:
Originally Posted by diamond
I'm not following you Scott. Basically asking whether one can use an RV 14 tail on an RV 9 and appreciate some increase in strength at any point (not all) on the plane. If so, why not make the substitution if it's only a pound heavier?
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I think the point is that it doesn't buy you anything - it adds a pound of weight with a large moment arm but doesn't add to the strength of the airframe.
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Brad Benson, Maplewood MN.
RV-6A N164BL, Flying since Nov 2012!
If you're not making mistakes, you're probably not making anything
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11-23-2013, 01:59 AM
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Join Date: Nov 2013
Location: Phoenix, Arizona
Posts: 60
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Other advantage?
Strength issues aside, it has been stated that the only parts requiring final drilling on the 14 are those that share parts with the 10. Thus, if the 14 horizontals are dimensionally compatible with the 9, couldn't a 9 builder request 14 horizontal components to reduce a little work in building? The extra aft pound wouldn't be so detrimental to those with heavier FWF setups.
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12-02-2013, 10:46 AM
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Join Date: Nov 2007
Location: Sebastian, FL
Posts: 29
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I started with the 9 empennage and have changed to the 14. Although they share similar dimensional plan forms, the engineering of the attach brackets to the rear cone is completely different. Fitting a 14 horizontal stab to a 9 cone would require significant modification and engineering to do this properly (IMHO). To my knowledge there have been no structural failures of a 9 series emp so there would be very little to zero ROI for the effort it would require to re-engineer an already proven and fantastic design.
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RV-14A Wing - Complete - SOLD
Emp Kit - Complete - SOLD
S/N 140064
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12-02-2013, 02:49 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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If you want to strengthen the -9's HS, simply add nose ribs where they are missing.
The -9's VS, rudder, and fuselage is the same as the -7 (other than the spar section).
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Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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