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02-11-2020, 07:19 AM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by majuro15
I?m interested in the plenum for the RV-10 and suggest designing it to fit the ShowPlanes cowl. I was told years ago the 10 James cowl molds were destroyed.
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Since he is the guy who makes the James Cowl, why would he go through the trouble of designing and building a plenum for a competitor's cowl?
Just saying...
__________________
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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02-11-2020, 07:54 AM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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Quote:
Originally Posted by Capflyer
? We are also collaborating with a couple builders in the design and development of a cowl for the RV14 and RV10. Computer aided design and simulation will be used during the development of these new products.
? Several molds that we have been using need design improvements or are at the end of their useful life so we are making new molds that can be used for vacuum infusion of fiberglass and carbon fiber parts.
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Excellent opportunity to change a few details.
Sam is a great guy, but I don't think he ever got beyond the notion of intake throttling.
Some of the latest props have very wide blades, so there may be a need for clearance adjustment.
Some of the plenum intakes, in particular for the short cowls, appear to be poorly shaped for optimum pressure recovery. I have one set of pressure measurements for a short cowl indicating pressure performance well below the average for standard RV cowls. Easy to correct with a little care. See the plenum intake redesign from Bill Lane.
Why not incorporate a variable exit option?
__________________
Dan Horton
RV-8 SS
Barrett IO-390
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02-11-2020, 08:15 AM
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Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 2,596
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Quote:
Originally Posted by majuro15
I?m interested in the plenum for the RV-10 and suggest designing it to fit the ShowPlanes cowl. I was told years ago the 10 James cowl molds were destroyed.
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Correct. My understanding is that Will James got so much noise on the RV-10 cowl that he just stopped making it. A lot of this noise was from a handful of builders with ?strong opinions? on VAF.
Too bad. The James Cowl on the RV-10 I built has performed beautifully for the mission I built the plane to do, high efficiency cruise. In fact, if I ever build an RV-10 again a go/no go decision will be dependent on the availability of a new James Cowl. I don?t see Van?s updating the stock cowl anytime soon.
Carl

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02-11-2020, 11:47 AM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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Quote:
Originally Posted by Carl Froehlich
Too bad. The James Cowl on the RV-10 I built has performed beautifully for the mission I built the plane to do, high efficiency cruise. In fact, if I ever build an RV-10 again a go/no go decision will be dependent on the availability of a new James Cowl.
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Carl, didn't you already tell us you could not fly the 90 knot inbound to OSH without getting too hot for comfort?
An RV which won't do it comfortably is best described as "crippled".
__________________
Dan Horton
RV-8 SS
Barrett IO-390
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02-11-2020, 01:47 PM
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Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 2,596
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Quote:
Originally Posted by DanH
Carl, didn't you already tell us you could not fly the 90 knot inbound to OSH without getting too hot for comfort?
An RV which won't do it comfortably is best described as "crippled".
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No - never said that. It can fly at 90 knots all day long. I just don’t like doing that. Perhaps I phrased what I said wrong.
I launched out of Phoenix at 110 degrees then a climb up to 14,000’, no issues.
Carl
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02-11-2020, 03:02 PM
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Join Date: Feb 2005
Location: LSGY
Posts: 3,198
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nice cowl!
Quote:
Originally Posted by Carl Froehlich
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All I can say is "wow!" That's a really nice looking cowl!
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02-12-2020, 07:56 AM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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Quote:
Originally Posted by rv8ch
All I can say is "wow!" That's a really nice looking cowl!
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Indeed it is, in particular matched with that spinner.
Quote:
Originally Posted by Carl Froehlich
No - never said that. It can fly at 90 knots all day long. I just don?t like doing that. Perhaps I phrased what I said wrong.
I launched out of Phoenix at 110 degrees then a climb up to 14,000?, no issues.
Carl
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I hear ya' brother. Those inlets are what, about 4.5"D? Although the results are acceptable to you, the data says the few builders with the 6" inlet cowls probably do better.
It's an interesting case of styling vs performance. The smaller inlet ring and sharp edged exterior profile won't perform as well as the larger inlet and a rounded exterior profile, but the pointy look is fabulous.
Given the opportunity to revise a design for the -10, I'd be looking at a 6" low Vi/Vo inlet with Cessna/Mooney style baffling and no plenum. See the TTX, the Acclaim, or our own Mark Frederick's latest Rocket cowl. None are ugly or slow, and they all cool very well.
__________________
Dan Horton
RV-8 SS
Barrett IO-390
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02-19-2020, 07:53 AM
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Join Date: Jan 2005
Posts: 4,285
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Congrats. Glad you are continuing this great line of products. The quality of SJ products was high, which I have the gut feel you will maintain. Please keep the prices down.
To Sam James, thank you for the seminars at OSH and answering my phone calls with great advice and information.
__________________
George
Raleigh, NC Area
RV-4, RV-7, ATP, CFII, MEI, 737/757/767
2020 Dues Paid
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02-19-2020, 07:54 AM
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Join Date: Jan 2005
Posts: 4,285
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Quote:
Originally Posted by Carl Froehlich
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This is why I love piano hinges.... I am going to print this and hang it on my shop wall for insperation...
__________________
George
Raleigh, NC Area
RV-4, RV-7, ATP, CFII, MEI, 737/757/767
2020 Dues Paid
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