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craig(at)craigandjean.com
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 Posted: Wed Jul 06, 2011 12:25 am Post subject: Fuel flow test results. |
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[quote]Were the caps on the fuel tanks? Are they vented? If you leave the plane in a level attitude how much of your 2*5 gallons flow out? When you stopped was there the same amount of fuel in both tanks? Did the flow stop completely or was it just reduced to a trickle? -- Craig [b]
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dougsnash
Joined: 14 Apr 2008
Posts: 281
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| Posted: Wed Jul 06, 2011 2:42 am Post subject: Fuel flow test results. |
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John, I had a similar issue when I did my fuel flow test last fall. To get a true flow value I ended up disconnecting the fuel line at the inlet to the pump. I think I was able to get the 2X max fuel demand up to about 16 degrees (at 17 it dropped off significantly). In the test you describe, the carb ends of the hoses are lower than the tank outlets but the fuel pump is likely at or above the tank outlet. That is the one big pain about where Rotax puts its fuel pump. Here in Canada, fuel flow checks are manditory. The inspector accepted the fuel check at the pump because of the nature of the Rotax pump.
Keep in mind that your 15 degrees isn't the max climb angle of the plane, it is just the max climb angle with a failed fuel pump.
Doug MacDonald
CH-701 from scratch
NW Ontario, Canada
Do Not Archive
From: John Marzulli <john.marzulli(at)gmail.com>
To: zenith701801-list(at)matronics.com
Sent: Wed, July 6, 2011 3:38:03 AM
Subject: Re: Fuel flow test results.
The caps were on the tanks and they are vented ( at least that is what Zenith tells me ).
We didn't do a full flow measurement with a meter, so the start point is somewhat arbitrary. at fifteen degrees the fuel was fully stopped.
John Marzulli
http://MarzulliPhoto.net/
http://701Builder.blogspot.com/
[quote][b]
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craig(at)craigandjean.com
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| Posted: Wed Jul 06, 2011 6:30 am Post subject: Fuel flow test results. |
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My plans also say the caps are vented (upper left corner of 7V11. But they also say to drill an 1/8th inch hole in the caps. Or just try leaving them off.
Still seems odd though. After you lowered the nose did the flow restart? That would show that no crud had blocked something.
-- Craig
From: owner-zenith701801-list-server(at)matronics.com [mailto:owner-zenith701801-list-server(at)matronics.com] On Behalf Of John Marzulli
Sent: Wednesday, July 06, 2011 1:38 AM
To: zenith701801-list(at)matronics.com
Subject: Re: Fuel flow test results.
The caps were on the tanks and they are vented ( at least that is what Zenith tells me ).
We didn't do a full flow measurement with a meter, so the start point is somewhat arbitrary. at fifteen degrees the fuel was fully stopped.
John Marzulli
http://MarzulliPhoto.net/
http://701Builder.blogspot.com/
On Wed, Jul 6, 2011 at 1:23 AM, Craig Payne <craig(at)craigandjean.com (craig(at)craigandjean.com)> wrote: | Quote: | | Were the caps on the fuel tanks? Are they vented? If you leave the plane in a level attitude how much of your 2*5 gallons flow out? When you stopped was there the same amount of fuel in both tanks? Did the flow stop completely or was it just reduced to a trickle? -- Craig |
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789 | Quote: | | If you leave the plane in a level attitude how much of your 2*5 gallons flow out? |
0 | Quote: | | If you leave the plane in a level attitude how much of your 2*5 gallons flow out? |
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3 | Quote: | | If you leave the plane in a level attitude how much of your 2*5 gallons flow out? |
4 | Quote: | | If you leave the plane in a level attitude how much of your 2*5 gallons flow out? |
5 | Quote: | | If you leave the plane in a level attitude how much of your 2*5 gallons flow out? |
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8 | Quote: | | If you leave the plane in a level attitude how much of your 2*5 gallons flow out? |
901234
[quote][b]
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john.marzulli(at)gmail.co
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| Posted: Wed Jul 06, 2011 7:27 am Post subject: Fuel flow test results. |
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Thanks Doug. I'll retry the test that way
Craig - The fuel did start flowing again when the nose was lowered.
John Marzulli
http://MarzulliPhoto.net/
http://701Builder.blogspot.com/
On Wed, Jul 6, 2011 at 7:27 AM, Craig Payne <craig(at)craigandjean.com (craig(at)craigandjean.com)> wrote:
[quote]
My plans also say the caps are vented (upper left corner of 7V11. But they also say to drill an 1/8th inch hole in the caps. Or just try leaving them off.
Still seems odd though. After you lowered the nose did the flow restart? That would show that no crud had blocked something.
-- Craig
From: owner-zenith701801-list-server(at)matronics.com (owner-zenith701801-list-server(at)matronics.com) [mailto:owner-zenith701801-list-server(at)matronics.com (owner-zenith701801-list-server(at)matronics.com)] On Behalf Of John Marzulli
Sent: Wednesday, July 06, 2011 1:38 AM
To: zenith701801-list(at)matronics.com (zenith701801-list(at)matronics.com)
Subject: Re: Fuel flow test results.
The caps were on the tanks and they are vented ( at least that is what Zenith tells me ).
We didn't do a full flow measurement with a meter, so the start point is somewhat arbitrary. at fifteen degrees the fuel was fully stopped.
John Marzulli
http://MarzulliPhoto.net/
http://701Builder.blogspot.com/
On Wed, Jul 6, 2011 at 1:23 AM, Craig Payne <craig(at)craigandjean.com (craig(at)craigandjean.com)> wrote:
| Quote: | Were the caps on the fuel tanks? Are they vented? If you leave the plane in a level attitude how much of your 2*5 gallons flow out? When you stopped was there the same amount of fuel in both tanks?
Did the flow stop completely or was it just reduced to a trickle? -- Craig |
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789 | Quote: | | If you leave the plane in a level attitude how much of your 2*5 gallons flow out? |
0 | Quote: | | If you leave the plane in a level attitude how much of your 2*5 gallons flow out? |
1 | Quote: | | If you leave the plane in a level attitude how much of your 2*5 gallons flow out? |
2 | Quote: | | If you leave the plane in a level attitude how much of your 2*5 gallons flow out? |
3 | Quote: | | If you leave the plane in a level attitude how much of your 2*5 gallons flow out? |
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| Quote: | | If you leave the plane in a level attitude how much of your 2*5 gallons flow out? |
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8 | Quote: | | If you leave the plane in a level attitude how much of your 2*5 gallons flow out? |
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[b]
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ursuacoc(at)hotmail.com
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| Posted: Mon Jul 11, 2011 7:40 am Post subject: Fuel flow test results. |
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I use a boost pump.
Francisco
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