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01-11-2020, 01:30 PM
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Join Date: Jan 2010
Location: Ottawa, Ks
Posts: 2,188
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How do the endurance numbers look at 65%ish power, higher altitude and LOP?
The last 10-15 knts are rarely worth the extra fuel burn in my opinion. I cringe a bit inside when I have to cruise at 2500? because of high winds above and GPH goes over 8. I average in the mid to upper 7 GPH and upper 150?s-lower160?s TAS in my fixed pitched O-360 in my 7 by utilizing altitude and LOP. I?ve done several 4.5 hour legs landing with 2 hours of fuel on board, a 9 should do slightly better.
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RV 7 400 hours and counting
19 donation done
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01-11-2020, 02:55 PM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,769
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Check the numbers closely.
Looking at your numbers you are comparing 42 gals of fuel on the RV-7 vs. 46 gals on the -9 with ER tanks. If you only put 6 gals in the ER tanks, then you will have the same 42 gals as in the -7. This, by my calculations gives you 40 lbs of baggage; same as the RV-7.
This would seem to be an advantage of being able to add an extra 4 gals of fuel when you don't need all that baggage.
__________________
Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
Last edited by Mel : 01-11-2020 at 03:25 PM.
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01-11-2020, 04:18 PM
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Join Date: Mar 2008
Location: Clarksboro, NJ
Posts: 829
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You could also increase the gross weight of your plane. If I understand right, the Vans numbers are suggestions and the builder can set and flight test the gross. Since the added weight is in the wings, it does not add any addition load to the load bearing components.
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01-11-2020, 04:43 PM
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Join Date: Aug 2011
Location: Jeffersonville, IN
Posts: 394
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I would suggest that since 99.999% of RV9's are built with stock tanks, they are probably very much adequate.
I don't know of any 9's that have AC either. Nature provide free AC in the form and altitude which is very easy to accomplish in an RV.
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Jeff Scott
RV9A First Flight 9/30/19
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01-11-2020, 05:27 PM
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Join Date: Jun 2005
Location: Cedar Park, TX
Posts: 3,156
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Our before takeoff checklist includes "Climb and maintain 72 degrees." Stock tanks and a slightly portly RV9A and we've been just fine with our tip-up in Texas heat for over a decade.
__________________
Scott Card
CQ Headset by Card Machine Works
CMW E-Lift
RV-9A N4822C flying 2200+hrs. / Cedar Park, TX
RV8 Building - fuselage / showplanes canopy (Done!)
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01-11-2020, 06:01 PM
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Join Date: Mar 2008
Location: Ramona, CA
Posts: 2,370
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I think my longest leg was from Evanston, WY to Ramona, CA. Still landed with more than an hour (6+ gallons) of fuel. I'm more than ready to stop at around 3 hours just to stretch the legs and drain the bladder. If I had the extra fuel, I most likely wouldn't be using it very often (maybe once or twice a year). Coming back from parts east or north in the summer means flying over the Sonora or Mojave Deserts and stopping for fuel in say Mesquite, NV or Thermal, CA would be uncomfortable when the heat is in triple digits. As for the non-negotiable A/C, I live in SoCal and it can be very hot here in most months. Yes, it would be nice to have while on the ground, but once you are flying above 5000' (maybe 5 minutes of flying) you'll be comfortable. I can't comment on humidity, since that is not an issue in my locale. I've flown out of Mesa, AZ when it was 119F! That was uncomfortable, and it didn't cool down much even above 8000'.
I did up my Gross Weight to 1800 pounds and the airplane flys fine and is still well within CG limits with 100 pounds of baggage. Empty weight on my airplane is 1101 pounds. Flying the RV-9A when it is light, versus at gross weight is quite different. Like driving a truck vs. a little sports car. Keep it light!
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01-11-2020, 06:28 PM
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Join Date: Nov 2019
Location: DFW
Posts: 14
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Quote:
Originally Posted by Northernliving
Have you checked out the Pat Tuckey tanks? That's my plan. Mike Stewart also did something similar http://mstewart.net/super8/ertanks/Index.htm
I agree that 3.5-4 hours is usually enough time. However, there are times where I would really like 1-2 more hours to avoid a stop.
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This was a fun read thanks!
Quote:
Originally Posted by Dan B
We have the IO-320 engine with GAMI injectors and run it lean of peak during cruise. 36.0 gallon fuel capacity.
Our RV-9 engine data down load for a trip climbing to 10,000 cruise altitude from our home airport at 1100' elevation is as follows:
Time and fuel burn beginning at engine start, including taxi, climb, and cruise (148kts TAS), for the first hour the fuel burn was 6.0 gal. There after, fuel burn was 6.3 gph at 148kts TAS. An additional 3.0 hours of cruise will still leave you with 10 gallons of reserve fuel.
The TAS on our RV9 will increase to about 153kts, burning 6.7 gph at 9000'-12000'.
That amount of fuel endurance will give most bladders a challenge.
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Interesting. Thanks for this. I?ll dig further into IO-320 numbers
Quote:
Originally Posted by Mel
Looking at your numbers you are comparing 42 gals of fuel on the RV-7 vs. 46 gals on the -9 with ER tanks. If you only put 6 gals in the ER tanks, then you will have the same 42 gals as in the -7. This, by my calculations gives you 40 lbs of baggage; same as the RV-7.
This would seem to be an advantage of being able to add an extra 4 gals of fuel when you don't need all that baggage.
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Mel, That looks correct. This or just extending the tank by a rib might be the ticket. I might be reaching out to you at some point since you are in the DFW area.
Quote:
Originally Posted by scard
Our before takeoff checklist includes "Climb and maintain 72 degrees." Stock tanks and a slightly portly RV9A and we've been just fine with our tip-up in Texas heat for over a decade.
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You guys are making interesting arguments. Ones that have been made between my wife and I. A/C discussions and negotiations are going to take place again.
Thanks a whole bunch everyone!
__________________
2020 Dues Paid
RV14-A Empennage Delevered 3/17/20
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01-11-2020, 07:02 PM
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Join Date: Jan 2010
Location: Southern Michigan
Posts: 1,966
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Quote:
Originally Posted by rocketman1988
I have no major complaints with the QB quality of my -10...
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I have no complaints with the quality of my QB in general either, just the fuel tanks. And you don?t know you have a QC issue in the fuel tanks until you do. Once I opened my QB tanks up, it was obvious there would be leakage issues down the road had I not done so.
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David C.
Howell, MI
RV-10: #41686 Under Construction
RV-9A: #90949 Under Construction
RV-10: #40637 Completed/Sold 2016
Cozy MKIV:#656 Completed/Sold 2007
"Donor Exempt" but donated through Dec. 2020
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01-11-2020, 07:07 PM
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Join Date: Jan 2010
Location: Southern Michigan
Posts: 1,966
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Quote:
Originally Posted by OneTwoTree
I?ve been watching your updates on that. Your experience with the bad quality of quick build has me thinking of doing slow build wings and quick build fuselage.
Most of the trips I want to do regularly are 4 and 4.5 away in an RV. So 7 gallons would go a long way. Did you just swap the outer tank rib with another non tank rib to extend the tank or did you purchase other ribs through van?s?
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It was not an EZ modification to do on tanks already fabricated. I would not recommend it unless it was a new wing build. I cut off most of the outboard bay and spliced on a new partial tank skin and baffle with an additional rib. Not for the faint of heart, but I am glad I opened up the QB tanks .
__________________
David C.
Howell, MI
RV-10: #41686 Under Construction
RV-9A: #90949 Under Construction
RV-10: #40637 Completed/Sold 2016
Cozy MKIV:#656 Completed/Sold 2007
"Donor Exempt" but donated through Dec. 2020
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01-11-2020, 08:08 PM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,769
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Quote:
Originally Posted by OneTwoTree
Mel, That looks correct. This or just extending the tank by a rib might be the ticket. I might be reaching out to you at some point since you are in the DFW area.
You guys are making interesting arguments. Ones that have been made between my wife and I. A/C discussions and negotiations are going to take place again.
Thanks a whole bunch everyone!
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No Problem. Between the knee replacement and prostrate surgery, I've been pretty much stuck in the house since last Halloween. Just now starting back to work. Feel free to come out for a visit. I can show you lots of stuff.
Mel
972-784-7544
__________________
Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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