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Thom Riddle
Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)
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 Posted: Fri Jan 15, 2010 6:17 am Post subject: Re: Fuel pump failure |
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I used to own a 701 and its nose up pitch potential is amazing. I suggest the following: Put the nose wheel up on a block or chair or whatever to get the tail down as low as possible. Then measure vertical distance from the wing tank outlet and the inlet to the mechanical fuel pump. You may be surprised to find that this distance is minimal and probably insufficient to provide enough head pressure for reliable gravity flow during full power nose high attitude.
The suggestion made by someone else to pressure feed the tank vents is also a good one. I once owned a RANS S6S with these vent tubes. I had unequal draining from the two wing tanks due to a slight mis-alignment of the two filler cap vent tubes, so this minor pressure differential can make a big difference in flow rate.
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_________________
Thom Riddle
Buffalo, NY (9G0)
Don't worry about old age... it doesn't last very long.
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dirtfly7(at)yahoo.com
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| Posted: Fri Jan 15, 2010 9:12 am Post subject: Fuel pump failure |
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Here is an article about someone's fuel system modification on a Rans S-7.
It may be helpful. http://www.pipcom.com/~cowcam/fuelsys.htm
Joel
--- On Fri, 1/15/10, Thom Riddle <riddletr(at)gmail.com> wrote:
[quote]
From: Thom Riddle <riddletr(at)gmail.com>
Subject: Re: Fuel pump failure
To: rotaxengines-list(at)matronics.com
Date: Friday, January 15, 2010, 7:17 AM
--> RotaxEngines-List message posted by: "Thom Riddle" <[url=/mc/compose?to=riddletr(at)gmail.com]riddletr(at)gmail.com[/url]>
I used to own a 701 and its nose up pitch potential is amazing. I suggest the following: Put the nose wheel up on a block or chair or whatever to get the tail down as low as possible. Then measure vertical distance from the wing tank outlet and the inlet to the mechanical fuel pump. You may be surprised to find that this distance is minimal and probably insufficient to provide enough head pressure for reliable gravity flow during full power nose high attitude.
The suggestion made by someone else to pressure feed the tank vents is also a good one. I once owned a RANS S6S with these vent tubes. I had unequal draining from the two wing tanks due to a slight mis-alignment of the two filler cap vent tubes, so this minor pressure differential can make a big difference in flow rate.
--------
Thom Riddle
Buffalo, NY
Kolb Slingshot SS-021
Jabiru 2200A #1574
Tennessee Prop 64x31
I have reached an age when, if someone tells me to wear socks, I don't have to.
- Albert Einstein
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