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madriver42(at)gmail.com
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 Posted: Fri Sep 21, 2012 10:16 am Post subject: 701 Fuel system |
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John,
In reference to your question about uneven full flows from the tanks. I never have flown with the Zenith supplied caps but from the beginning, after reading about the problems of others, I installed the caps from Wag Aero. BTW if you don't have a tube bender. go to Harbor Freight , they sell a cute little one for not much money.which fits the application perfectly and makes a proper bend. On mine I had to go past ninety degrees to get the right attitude in relation to the wing. As others have pointed out I think that this set-up offers a couple of advantages: first, the caps have never leaked across the wing, Second, they offer an "equal positive" pressure in the tanks to insure even flow - I don't seem to have the extreme imbalances discussed by others using the "standard caps". I also found a rubber "washer" that I glued to the top of the wing to prevent spilled fuel going inside the wing. After 60 hours I have no complaints - I find the flows to be about even - especially if I fly straight and level for most of the flight profile. I might be a "half of a gallon" off after an hour or so of flight. I think that this is resultant of equal pressure from the forward facing tubes. Remember, when you add complexity you add a "small" chance for error. Most of us who have experience in the older airplanes with left - right - off fuel management systems - think, PA-22, PA-12 etc have managed to shut down the engine - sometimes at a most embarrassing moment. Still - because it will be easy - I plan to install two valves, one at each wing root above my head on the panel that forms the top of the cockpit just under the Plexiglas.. This would allow ease of fuel management, if necessary and or an emergency shutoff closer to the wing.
Still grinnin!
Phil Smith
CH 701, Rotax ULS
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bobmccully
Joined: 25 Nov 2012
Posts: 2
Location: Red Deer, Alberta, Canada
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| Posted: Sun Nov 25, 2012 11:36 am Post subject: Re: 701 Fuel system and mods to bellcrank/torque tube |
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Hello I am very new to this forum. I have built a CH701 and it has been test flown with no major issues but I am wondering about those gas tank caps. Do they vent properly? Do they allow even flow distribution? Or, should I be looking for a better option?
Also, I too was not happy with the original setup for the bellcrank/torque tube. I used the example from the Zenair newsletter that a builder submitted and I have to say that it works great. Wonder if Zenair could adopt it as the new standard
bob
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NYTerminat(at)aol.com
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| Posted: Sun Nov 25, 2012 3:15 pm Post subject: 701 Fuel system |
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I put on snorkel caps that has a pitot tube that faces front. Make sure if using your standard Zenith caps, that you have drilled the extra holes in them according to the dwgs.
There is nothing wrong with the Zenith touque tube.
In a message dated 11/25/2012 2:38:38 P.M. Eastern Standard Time, minisalways(at)shaw.ca writes:
| Quote: | --> Zenith701801-List message posted by: "bobmccully" <minisalways(at)shaw.ca>
Hello I am very new to this forum. I have built a CH701 and it has been test flown with no major issues but I am wondering about those gas tank caps. Do they vent properly? Do they allow even flow distribution? Or, should I be looking for a better option?
Also, I too was not happy with the original setup for the bellcrank/torque tube. I used the example from the Zenair newsletter that a builder submitted and I have to say that it works great. Wonder if Zenair could adopt it as the new standard
bob
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Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=388926#388926
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