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  #1  
Old 02-09-2022, 05:12 PM
airguy's Avatar
airguy airguy is offline
 
Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,842
Default Another good cross-country

I was up in Boise Idaho yesterday taking care of a little business, and flew back this morning to my home base in west Texas 73XS.

1,009 nautical miles - the return trip at 17,000' took me 5.9 hours nonstop burning only 39 gallons of fuel. You can't beat that with a stick.

During the trip home my tach rolled over 1000 hours (hobbs is a bit shy - I bought the engine with 105 hours on it). Saw a lot of pretty country and the MOA's were cold today so after Moab UT on the way back I was given direct destination - more than 600 miles away.

https://flightaware.com/live/flight/...654Z/KBOI/73XS
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Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2022 dues paid
N16GN flying 1,000 hrs and counting on 91E10; IO360, SDS, WWRV200, Dynon HDX, IFD440, G5
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
Pending Repeat Offender - 10 kit is on order. TDI? Turbine? Stay tuned!
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  #2  
Old 02-09-2022, 05:42 PM
BenNabors BenNabors is offline
 
Join Date: Mar 2014
Location: Alabama
Posts: 153
Default Convert that

Converting that to statute miles, that is 29.75 mpg as the crow flies. Now that is impressive!
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  #3  
Old 02-09-2022, 06:47 PM
BillL BillL is offline
 
Join Date: Sep 2007
Location: Central IL
Posts: 6,556
Default

I can't recall . . . you do have extra fuel tanks don't you?

That is a sweet trip, long time in the seat, that 9 really shines at 17k!
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RV-7
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  #4  
Old 02-09-2022, 08:12 PM
airguy's Avatar
airguy airguy is offline
 
Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,842
Default

Quote:
Originally Posted by BillL View Post
I can't recall . . . you do have extra fuel tanks don't you?

That is a sweet trip, long time in the seat, that 9 really shines at 17k!
Yes I have the standard 18 gallon inboards for the 9A, and then I have a pair of outboards at 16.5 gallons each. After the 1000 nautical mile trip I still landed with 30 gallons on board.
__________________
Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2022 dues paid
N16GN flying 1,000 hrs and counting on 91E10; IO360, SDS, WWRV200, Dynon HDX, IFD440, G5
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
Pending Repeat Offender - 10 kit is on order. TDI? Turbine? Stay tuned!
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  #5  
Old 02-10-2022, 11:51 PM
Taltruda Taltruda is offline
 
Join Date: Oct 2017
Location: Las Vegas, NV
Posts: 1,188
Default

Quote:
Originally Posted by airguy View Post
Yes I have the standard 18 gallon inboards for the 9A, and then I have a pair of outboards at 16.5 gallons each. After the 1000 nautical mile trip I still landed with 30 gallons on board.
Greg, do you have a build log online on how you did the outboard tanks with the prepunched holes? Are they permanently mounted?
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Las Vegas
RV-4 flying…
RV-8 empenage finished 10-2020

Wings Started.. 11-2020
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  #6  
Old 02-11-2022, 06:40 AM
airguy's Avatar
airguy airguy is offline
 
Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,842
Default

Quote:
Originally Posted by Taltruda View Post
Greg, do you have a build log online on how you did the outboard tanks with the prepunched holes? Are they permanently mounted?
I don't have it online anymore, but I do have a full builders log with almost 3000 pictures, I'll be happy to share any of that with you. I'll PM you my email address.

I followed the Pat Tuckey design he did for his 8, modified a bit for the 9 wing. On the outboard sections I eliminated 5 internal structural ribs and replaced them with 7 fuel ribs, added a baffle plate to the rear exactly as the inboards have, bolted it to the spar with Z-brackets, and then riveted it to the wing. The outboard tanks are not removable - if I develop a bad leak in them I'll just abandon them in place. I calculated 16 additional gallons each side, but the pump says I'm actually putting 16.5 in each one.

CAUTION - this puts a lot more mass further out on the wing. That will affect spin recovery adversely and severely. It also greatly increases the bending moment on the wing root during ground ops with fuel in the outboards - I do not land with fuel in the outboards, I only load enough there to burn before my next planned landing. Study the numbers very carefully on the CG effect for your plane.
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Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2022 dues paid
N16GN flying 1,000 hrs and counting on 91E10; IO360, SDS, WWRV200, Dynon HDX, IFD440, G5
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
Pending Repeat Offender - 10 kit is on order. TDI? Turbine? Stay tuned!
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  #7  
Old 02-11-2022, 09:12 AM
PilotjohnS PilotjohnS is offline
 
Join Date: Jan 2016
Location: Southwest
Posts: 2,216
Default Data data

So from the data, looks like your climb was 800 feet per min at 160's mph for 20 min.
The descent was started 100 miles, 30 min, out at 500 feet per minute.

So when i get my plane flying, it seems these high altitudes only make sense for very long trips of 3 hours or more. But this depends on fuel flow at higher altitudes. Something to work on during my flight testing. I will need to make sure I have a flight test area big enough to do a 3 hour leg. ;-)
(I wonder if i can get a 500 mile square flight test box!!!!)

Although i do have the training wheel up front, may not be as fast
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WARNING! Information presented in this post is my opinion. All users of info have sole responsibility for determining accuracy or suitability for their use.

Dues paid 2022, worth every penny

RV9A- Status:
98% done, 2% left to go
Structure done (less gear)
Electrical/Panel done
Firewall Forward 95% done
Fiberglass 90%
www.pilotjohnsrv9.blogspot.com

Last edited by PilotjohnS : 02-11-2022 at 09:16 AM.
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  #8  
Old 02-11-2022, 09:37 AM
airguy's Avatar
airguy airguy is offline
 
Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,842
Default

Quote:
Originally Posted by PilotjohnS View Post
So from the data, looks like your climb was 800 feet per min at 160's mph for 20 min.
The descent was started 100 miles, 30 min, out at 500 feet per minute.
At takeoff I had the climb set to 1000/min until about 9000' or thereabouts - then I reduced it to 800, and down to 600 at around 11,000'. I levelled at 17,000' climbing at 400/min. Indicated airspeed throughout the climb was in the low-100's to mid-90's with good engine cooling.

I usually do a 1000/min descent from altitude, but I had such a good tailwind (and was getting cold from 8 degrees F ambient) that I did a shallower longer descent profile this time.

But to your point, high altitude cruise does require some vertical planning, yes.
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Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2022 dues paid
N16GN flying 1,000 hrs and counting on 91E10; IO360, SDS, WWRV200, Dynon HDX, IFD440, G5
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
Pending Repeat Offender - 10 kit is on order. TDI? Turbine? Stay tuned!

Last edited by airguy : 02-11-2022 at 09:39 AM.
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  #9  
Old 02-11-2022, 09:48 AM
CD.'s Avatar
CD. CD. is offline
 
Join Date: Mar 2021
Location: Alabama
Posts: 49
Default

Very nice trip!
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  #10  
Old 02-11-2022, 12:09 PM
airguy's Avatar
airguy airguy is offline
 
Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,842
Default

Quote:
Originally Posted by PilotjohnS View Post
So from the data, looks like your climb was 800 feet per min at 160's mph for 20 min.
The descent was started 100 miles, 30 min, out at 500 feet per minute.
Still, it was only 22 minutes from takeoff to levelling at 17,000 feet, and I was loaded pretty heavy. Solo with about 50 pounds in the baggage compartment and 69 gallons of fuel.
__________________
Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2022 dues paid
N16GN flying 1,000 hrs and counting on 91E10; IO360, SDS, WWRV200, Dynon HDX, IFD440, G5
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
Pending Repeat Offender - 10 kit is on order. TDI? Turbine? Stay tuned!
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