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Fuel Flow Test

 
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Ed Godfrey



Joined: 05 May 2009
Posts: 47

PostPosted: Sun Aug 23, 2020 5:14 pm    Post subject: Fuel Flow Test Reply with quote

RV10 builders/flyers,
    I am pondering the fuel flow test as outlined in AC90-89B, Section
11, Par 1-19.e(1). For those of you who may have performed these tests,
what climb angle did you use and how did you obtain it. I did a test
with weighing down the tail and the best that I could get was about 12
1/2 degrees when the tail tie down hit the hangar floor. I am thinking
about raising the main gear off of the floor, but was not sure as to
what height would work out the best. I did place a call to Van's to see
if they had a "standard" of unuseable fuel for the RV10, but the reply
that I received was that it was up to the builder to determine that.
Thanks for any information to help me get by this step.

Ed Godfrey


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rjones560xl@gmail.com



Joined: 29 Jul 2015
Posts: 50
Location: Las Vegas, NV

PostPosted: Sun Aug 23, 2020 8:01 pm    Post subject: Fuel Flow Test Reply with quote

The usable fuel on my tanks is right at 30 gal. The tanks hold about a quart more than that. You can come very close to emptying it if you run it dry. Obviously if was rough you would likely suck some air a lot earlier. I usually leave about 2 gals in the lowest tank and make sure I am landing with at least 10 in the other because I am a real Coward when it comes to fuel reserve. I weighted the tail down to get the nose up about 10 degrees. It was a waste of time. I flowed about 48 gal/hr with my Airflow Performance electric pump as measured just before the FM300 throttle body.

Robert Jones

Quote:
On Aug 23, 2020, at 6:19 PM, Ed Godfrey <egodfrey(at)ameritech.net> wrote:



RV10 builders/flyers,
I am pondering the fuel flow test as outlined in AC90-89B, Section 11, Par 1-19.e(1). For those of you who may have performed these tests, what climb angle did you use and how did you obtain it. I did a test with weighing down the tail and the best that I could get was about 12 1/2 degrees when the tail tie down hit the hangar floor. I am thinking about raising the main gear off of the floor, but was not sure as to what height would work out the best. I did place a call to Van's to see if they had a "standard" of unuseable fuel for the RV10, but the reply that I received was that it was up to the builder to determine that. Thanks for any information to help me get by this step.

Ed Godfrey







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Kelly McMullen



Joined: 16 Apr 2008
Posts: 1187
Location: Sun Lakes AZ

PostPosted: Sun Aug 23, 2020 9:15 pm    Post subject: Fuel Flow Test Reply with quote

As for the pitch up, I wouldn't worry about it. I happen to know that the stock mechanical pump continues to deliver enough fuel for full throttle at 11,500 and over 70 degrees of pitch up. No, I didn't have enough brain cycles to think about turning on the boost pump at that point. (obviously not an intention test, but the engine never hiccuped.
As for unusable, I pumped fuel out of one tank at a time when calibrating the tanks, and then pulled the quick drain. Less than 1 qt remained with the airframe at normal, on the ground attitude.
I haven't felt a need to put a precise number on it, because when I am down to 5 gal per tank, I am landing at nearest suitable runway, period.

Quote:
Sent from my TRS-80 Model 100



On Sun, Aug 23, 2020 at 6:19 PM Ed Godfrey <egodfrey(at)ameritech.net (egodfrey(at)ameritech.net)> wrote:

Quote:
--> RV10-List message posted by: Ed Godfrey <egodfrey(at)ameritech.net (egodfrey(at)ameritech.net)>

RV10 builders/flyers,
     I am pondering the fuel flow test as outlined in AC90-89B, Section
11, Par 1-19.e(1). For those of you who may have performed these tests,
what climb angle did you use and how did you obtain it. I did a test
with weighing down the tail and the best that I could get was about 12
1/2 degrees when the tail tie down hit the hangar floor. I am thinking
about raising the main gear off of the floor, but was not sure as to
what height would work out the best. I did place a call to Van's to see
if they had a "standard" of unuseable fuel for the RV10, but the reply
that I received was that it was up to the builder to determine that.
Thanks for any information to help me get by this step.

Ed Godfrey


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