robin(at)PaintTheWeb.com
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 Posted: Tue Jun 29, 2010 4:46 pm Post subject: ~RE: Cowl Flaps |
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Interesting. It was mentioned to me more than a few times that the openings on the James cowl are much larger than needed but when I look at the Cirrus and Corvallis their inlet openings look larger than the James openings. The downside to the Experimental world seems to be completely void of aeronautical engineers.
Regarding LOP I have been flying LOP for ~30 hours now. I was hoping my last restrictor change was to be my last but that change made the engine run worse LOP. Unfortunately I cannot accurately balance my injectors because my fuel flow bounces around too much to give accurate numbers. It bounces more than the desired delta of first to last cylinder one looks for in a finely tuned injector package. That being said in my prior setup I was able to fly LOP at ~11.2-11.5 GPH at 155 TAS with lower cylinder temps as described.
Robin
From: owner-rv10-list-server(at)matronics.com (owner-rv10-list-server(at)matronics.com) [mailto:owner-rv10-list-server(at)matronics.com (owner-rv10-list-server(at)matronics.com)] On Behalf Of Deems Davis
Sent: Tuesday, June 29, 2010 4:35 PM
To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)
Subject: Re: Cowl Flaps
For all of the James cowl/plenum RV10 drivers. You will want to find Alan Bickle (at) OSH this year and talk and see what he's done re CHT and Oil Temps. It was a lot of work, but I think he's nailed the solution. Not to keep everyone in suspense, but his solution was bigger intake rings. If you haven't painted you cowl, See Alan 1st!!!.
I just got back from a trip to Provo, Ut from PHX, and had Oil temps peak (at) 220 on climb (and that was a 120kt climb) and avg 205 on the way up. Cyl #2 & #6 CHT's peaked (at) 415-420! 40 deg ROP got them down to under 400. OAT (at) altitude 65-70 F.
BUT.........
25 degs LOP and CHT's dropped to 345-360 and OIL temps to 195. I'm really happily surprised to see the cooling advantage that LOP brings
We had tail winds BOTH ways on our trip and still averaged 165kts GS (at) 11.2 gph! I'm liking this LOP stuff!!!!
Deems
On 6/29/2010 9:46 AM, Robin Marks wrote: | Quote: | | --> RV10-List message posted by: Robin Marks <robin(at)painttheweb.com> (robin(at)painttheweb.com) Sounds like the answer is no.I don't see the need if you are going standard vans cowl, 260 Hp engineetc... Maybe upgrade to the 2006 oil cooler and place the oil coolersplitter in the "wedge"Why complicate things that already work. Adding cowl flaps will definitelycomplicate the lower cowl assembly. Robin |
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